Aeroflex 2026Q Operating Manual

CDMA INTERFERER MULTISOURCE

GENERATOR

2026Q

Operating Manual

Document part no. 46892/361

Issue 8

12 November 2004

CDMA INTERFERER

MULTISOURCE GENERATOR

2026Q

10 kHz to 2.4 GHz

This manual applies to instruments with software issues of 2.01 and higher.

 Aeroflex International Ltd. 2004

No part of this document may be reproduced or transmitted in any form

or by any means, electronic or mechanical, including photocopying,

or recorded by any information storage or retrieval system,
without permission in writing by Aeroflex International Ltd.

(hereafter referred to throughout the document as ‘Aeroflex’).

Document part no. 46892/361

(PDF v

Based on Issue 8 of the printed manual.

12 November 2004

ersion)

i

This manual explains how to use the 2026Q CDMA Interferer MultiSource Generator.

Intended audience

Persons who have a need for accurately generated signals in the VHF and UHF spectrum.
It is assumed that the reader will be familiar with telecommunication terms used in modern

communication systems.

Structure

Chapter 1 Main features and performance data
Chapter 2 Installation details
Chapter 3 Local operation
Chapter 4 Source configuration, coupling and selected applications
Chapter 5 GPIB operation with keywords and sample programs
Chapter 6 Brief technical description
Chapter 7 Instructions for doing acceptance testing

About this manual

Document conventions

The following conventions apply throughout this manual:
RF OUTPUT Titles marked on the instrument panel are shown in capital letters

[SETUP] Key titles are as shown on the key-caps in square brackets.

[Carrier Freq]

RF Level Messages on the display are shown in italic letters.

Soft key titles are shown in italics in square brackets; for example,

[Carrier Freq] means the soft key adjacent to the Carrier Freq

title box at the side of the menu.

Associated publications

Other publications covering specific aspects of this equipment are:

Maintenance Manual (46882/295) Covers maintenance and repair.

Service Manual (46880/087) Consists of operating manual (this document) plus

maintenance manual.

ii

Contents

Preface ...............................................................................................................................................................iv

Precautions......................................................................................................................................................... v

Précautions......................................................................................................................................................viii

Vorsichtsmaßnahmen....................................................................................................................................... xi

Precauzioni...................................................................................................................................................... xiv

Precauciones...................................................................................................................................................xvii

Chapter 1 GENERAL INFORMATION .....................................................................................................1-1

Chapter 2 INSTALLATION .........................................................................................................................2-1

Chapter 3 LOCAL OPERATION.................................................................................................................3-1

First-time use ..............................................................................................................................3-7

Individual source operation.....................................................................................................3-15

Sweep .........................................................................................................................................3-25

Utilities.......................................................................................................................................3-29

Memory .....................................................................................................................................3-43

Error messages..........................................................................................................................3-47

Chapter 4 SETUP ...........................................................................................................................................4-1

Combiner setup...........................................................................................................................4-3

Coupling ......................................................................................................................................4-5

Applications.................................................................................................................................4-7

Chapter 5 REMOTE OPERATION .............................................................................................................5-1

Chapter 6 BRIEF TECHNICAL DESCRIPTION......................................................................................6-1

Chapter 7 ACCEPTANCE TESTING .........................................................................................................7-1

Test procedures...........................................................................................................................7-5

Acceptance test results tables ..................................................................................................7-30

INDEX ............................................................................................................................................................. I-1

iii

PATENT PROTECTION

The 2026Q CDMA Interferer MultiSource Generator is protected by the following patents:
EP 0322139
GB 2214012
US 4870384
EP 0125790
GB 2140232
US 4609881
US 5781600
US 5974362

Preface

iv

Precautions

These terms have specific meanings in this manual:

WARNING

information to prevent personal injury.

information to prevent damage to the equipment.

important general information.

Hazard symbols

The meaning of hazard symbols appearing on the equipment and in the documentation is as
follows:

Symbol Description

Refer to the operating manual when this symbol is marked on
the instrument. Familiarize yourself with the nature of the
hazard and the actions that may have to be taken.

Toxic hazard

General conditions of use

This product is designed and tested to comply with the requirements of IEC/EN61010-1 ‘Safety
requirements for electrical equipment for measurement, control and laboratory use’, for Class 1
portable equipment and is for use in a pollution degree 2 environment. The equipment is designed
to operate from an installation category 2 supply.

Equipment should be protected from the ingress of liquids and precipitation such as rain, snow,
etc. When moving the instrument from a cold to a hot environment, it is important to allow the
temperature of the instrument to stabilize before it is connected to the supply to avoid
condensation forming. The instrument must only be operated within the environmental conditions
specified in Chapter 1 ‘Performance data’ in the Operating/Instruction Manual otherwise the
protection provided by the equipment may be impaired.

This product is not approved for use in hazardous atmospheres or medical applications. If the
equipment is to be used in a safety-related application, e.g. avionics or military applications, the
suitability of the product must be assessed and approved for use by a competent person.

WARNING

Electrical hazards (AC supply voltage)

This equipment conforms with IEC Safety Class I, meaning that it is provided with a protective
grounding lead. To maintain this protection the supply lead must always be connected to the
source of supply via a socket with a grounded contact.

Be aware that the supply filter contains capacitors that may remain charged after the equipment is
disconnected from the supply. Although the stored energy is within the approved safety
requirements, a slight shock may be felt if the plug pins are touched immediately after removal.

Do not remove instrument covers as this may result in personal injury. There are no user­serviceable parts inside.

Refer all servicing to qualified personnel. See list of International Service Centers at rear of
manual.

Fuses

Note that the internal supply fuse is in series with the live conductor of the supply lead. If
connection is made to a 2-pin unpolarized supply socket, it is possible for the fuse to become

v

PRECAUTIONS

transposed to the neutral conductor, in which case, parts of the equipment could remain at supply
potential even after the fuse has ruptured.

WARNING

Fire hazard

WARNING

Make sure that only fuses of the correct rating and type are used for replacement.
If an integrally fused plug is used on the supply lead, ensure that the fuse rating is commensurate

with the with current requirements of this equipment. See under 'Performance Data' in Chapter 1
for power requirements.

Toxic hazards

Some of the components used in this equipment may include resins and other materials which give
off toxic fumes if incinerated. Take appropriate precautions, therefore, in the disposal of these
items.

WARNING

Beryllia

WARNING

Beryllia (beryllium oxide) is used in the construction of some of the components in this
equipment. This material, if incorrectly handled, could cause a danger to health − refer to the
Maintenance part of the Service Manual for safe handling precautions.

Beryllium copper

Some mechanical components within this instrument are manufactured from beryllium copper.
This is an alloy with a beryllium content of approximately 5%. It represents no risk in normal use.

The material should not be machined, welded or subjected to any process where heat is involved.
It must be disposed of as “special waste”.
It must NOT be disposed of by incineration.

WARNING

Heavy instrument

WARNING

Tilt facility

The weight of this instrument exceeds the 18 kg (40 lb) guideline for manual handling by a single
person. To avoid the risk of injury, an assessment should be carried out prior to handling which
takes account of the load, workplace environment and individual capability, in accordance with
European Directive 90/269/EEC and associated National Regulations.

When the instrument is in the tilt position, it is advisable, for stability reasons, not to stack other
instruments on top of it.

Static sensitive components

This equipment contains static sensitive components which may be damaged by handling − refer
to the Maintenance part of the Service Manual for handling precautions.

vi

Suitability for use

This equipment has been designed and manufactured by Aeroflex to generate low-power RF
signals for testing radio communications apparatus. If the equipment is not used in a manner
specified by Aeroflex, the protection provided by the equipment may be impaired.

Aeroflex has no control over the use of this equipment and cannot be held responsible for events
arising from its use other than for its intended purpose.

PRECAUTIONS

vii

PRECAUTIONS

Précautions

Les termes suivants ont, dans ce manuel, des significations particulières:

WARNING

contient des informations pour éviter toute blessure au personnel.

contient des informations pour éviter les dommages aux équipements.

contient d'importantes informations d'ordre général.

Symboles signalant un risque

La signification des symboles de danger apparaissant sur l'équipement et dans la documentation
est la suivante:

Symbole Nature du risque

Reportez-vous au manuel d'utilisation quand ce
symbole apparaît sur l'instrument. Familiarisez­vous avec la nature du danger et la conduite à tenir.

Danger produits toxiques

Conditions générales d’utilisation

Ce produit a été conçu et testé pour être conforme aux exigences des normes CEI/EN61010-1
“Règles de sécurité pour appareils électriques de mesurage, de régulation et de laboratoire”, pour
des équipements Classe I portables et pour une utilisation dans un environnement de pollution de
niveau 2. Cet équipement est conçu pour fonctionner à partir d’une alimentation de catégorie II.

Cet équipement doit être protégé de l’introduction de liquides ainsi que des précipitations d’eau,
de neige, etc... Lorsqu’on transporte cet équipement d’un environnement chaud vers un
environnement froid, il est important de laisser l’équipement se stabiliser en température avant de
le connecter à une alimentation afin d’éviter toute formation de condensation. L’doit être utilisé
uniquement dans les conditions d’environnement spécifiées dans “Performance data” dans le
chapitre 1 du manuel d’utilisation.

Ce produit n’est pas garanti pour fonctionner dans des atmosphères dangereuses ou pour un usage
médical. Si l'équipement doit être utilisé pour des applications en relation avec la sécurité, par
exemple des applications militaires ou aéronautiques, la compatibilité du produit doit être établie
et approuvée par une personne compétente.

WARNING

Securite electrique (tension d'alimentation alternative)

Cet appareil est protégé conformément à la norme CEI de sécurité class 1, c'est-à-dire que sa prise
secteur comporte un fil de protection à la terre. Pour maintenir cette protection, le cable
d'alimentation doit toujours être branché à la source d'alimentation par l'intermédiaire d'une prise
comportant une borne terre.

Notez que les filtres d'alimentation contiennent des condensateurs qui peuvent encore être chargés
lorsque l'appareil est débranché. Bien que l'énergie contenue soit conforme aux exigences de
sécurité, il est possible de ressentir un léger choc si l'on touche les bornes sitôt après
débranchement.

Ne démontez pas le capot de l'instrument, car ceci peut provoquer des blessures. Il n'y a pas de
pièces remplaçables par l'utilisateur à l'intérieur.

Faites effectuer toute réparation par du personnel qualifié. Contacter un des Centres de
Maintenance Internationaux dans la liste jointe à la fin du manuel.

Fusibles

Notez que le fusible d’alimentation interne est en série avec la phase du câble d’alimentation. Si la
prise d’alimentation comporte deux bornes non polarisées, il est possible de connecter le fusible au

viii

PRECAUTIONS

neutre. Dans ce cas, certaines parties de l’appareil peuvent rester à un certain potentiel même
après coupure du fusible.

WARNING

Risque lie au feu

WARNING

Danger produits toxiques

WARNING

Le Beryllia

Lors du remplacement des fusibles vérifiez l'exactitude de leur type et de leur valeur.
Si le cable d'alimentation comporte une prise avec fusible intégré, assurez vous que sa valeur est

compatible avec les besoins en courant de l'appareil. Pour la consommation, reportez-vous au
chapitre 1 "Spécifications".

Certains composants utilisés dans cet appareil peuvent contenir des résines et d'autres matières qui
dégagent des fumées toxiques lors de leur incinération. Les précautions d'usages doivent donc être
prises lorsqu'on se débarrasse de ce type de composant.

Le Beryllia (oxyde de Beryllium) entre dans la composition de certains composants de cet
appareil. Cette matière peut représenter un danger pour la santé s'il elle n'est pas manipulée de
façon correcte − se référer à la partie "Maintenance" du "Manuel de Maintenance" pour les
précautions de manipulation.

WARNING

Bronze au béryllium

Dans cet équipement,certaines pièces mécaniques sont à base de bronze au béryllium. Il s'agit d'un
alliage dans lequel le pourcentage de béryllium ne dépasse pas 5%. Il ne présente aucun danger en
utilisation normale.

Toutefois, cet alliage ne doit pas être travaillé, soudé ou soumis à un processus qui implique
l'utilisation d'une source de chaleur.

En cas de destruction, il sera entreposé dans un container spécial. IL ne devra pas être détruit par
incinération".

WARNING

Instrument lourd

WARNING

Position inclinée

Le poids de cet appareil est supérieur à la limite de 18 kg (40 lb), fixée pour le transport par une
seule personne. Afin d’éviter tout risque de blessure, il est nécessaire de faire, avant le transport,
une évaluation de la charge, des contraintes de l’environnement et des capacités de l’individu, en
conformité avec la Directive Européenne 90/269/EEC ainsi que les recommandations Nationales
concernées.

Lorsque l'appareil est dans une position inclinée, il est recommandé, pour des raisons des stabilité,
de ne pas y empiler d'autres appareils.

ix

Utilisation

PRECAUTIONS

Cet équipement a été conçu et fabriqué par Aeroflex pour générer des signaux RF de faible
puissance pour le test d'appareils de radio communications. La protection de l'équipement peut
être altérée s'il n'est pas utilisé dans les conditions spécifiées par Aeroflex. Aeroflex n'a aucun
contrôle sur l'usage de l'instrument, et ne pourra être tenu pour responsable en cas d'événement
survenant suite à une utilisation différente de celle prévue.

x

PRECAUTIONS

Vorsichtsmaßnahmen

Diese Hinweise haben eine bestimmte Bedeutung in diesem Handbuch:

WARNING

dienen zur Vermeidung von Verletzungsrisiken.

dienen dem Schutz der Geräte.

enthalten wichtige Informationen.

Gefahrensymbole

Die Bedeutung der Gefahrensymbole auf den Geräten und in der Dokumentation ist wie folgt:

Symbol Gefahrenart

Beziehen Sie sich auf die Bedienungsanleitung wenn
das Messgerät mit diesem Symbol markiert ist.
Machen Sie sich mit der Art der Gefahr und den
Aktionen die getroffen werden müssen bekannt.

Warnung vor giftigen Substanzen

Allgemeine Hinweise zur Verwendung

Dieses Produkt wurde entsprechend den Anforderungen von IEC/EN61010-1
“Sicherheitsanforderungen für elektrische Ausrüstung für Meßaufgaben, Steuerung und
Laborbedarf”, Klasse I, transportabel zur Verwendung in einer Grad 2 verunreinigten Umgebung,
entwickelt und getestet. Dieses Gerät ist für Netzversorgung Klasse II zugelassen.

Das Gerät sollte vor dem Eindringen von Flüssigkeiten sowie vor Regen, Schnee etc. geschützt
werden. Bei Standortänderung von kalter in wärmere Umgebung sollte das Gerät wegen der
Kondensation erst nach Anpassung an die wärmere Umgebung mit dem Netz verbunden werden.
Das Gerät darf nur in Umgebungsbedingungen wie in Kapitel 1 “Leistungsdaten (Performance
data)” der Bedienungsanleitung beschrieben, betrieben werden.

Dieses Produkt ist nicht für den Einsatz in gefährlicher Umgebung (z.B. Ex-Bereich) und für
medizinische Anwendungen geprüft. Sollte das Gerät für den Einsatz in sicherheitsrelevanten
Anwendungen wie z.B. im Flugverkehr oder bei militaerischen Anwendungen vorgesehen sein, so
ist dieser von einer für diesen Bereich zuständigen Person zu beurteilen und genehmigen.

WARNING

Elektrische Schläge (Wechselspannungsversorgung)

Das Gerät entspricht IEC Sicherheitsklasse 1 mit einem Schutzleiter nach Erde. Das Netzkabel
muß stets an eine Steckdose mit Erdkontakt angeschlossen werden.

Filterkondensatoren in der internen Spannungsversorgung können auch nach Unterbrechung der
Spannungszuführung noch geladen sein. Obwohl die darin gespeicherte Energie innerhalb der
Sicherheitsmargen liegt, kann ein leichter Spannungsschlag bei Berührung kurz nach der
Unterbrechung erfolgen.

Öffnen Sie niemals das Gehäuse der Geräte das dies zu ernsthaften Verletzungen führen kann. Es
gibt keine vom Anwender austauschbare Teile in diesem Gerät.

Lassen Sie alle Reparaturen durch qualifiziertes Personal durchführen. Eine Liste der
Servicestellen finden Sie auf der Rückseite des Handbuches.

Sicherungen

Die interne Sicherung in der Spannungszuführung ist in Reihe mit der spannungsführenden
Zuleitung geschaltet. Bei Verbindung mit einer zweiadrigen, nicht gepolten Steckdose kann die

xi

PRECAUTIONS

Sicherung in der Masseleitung liegen, so daß auch bei geschmolzener Sicherung Geräteteile immer
noch auf Spannungspotential sind.

WARNING

Feuergefahr

WARNING

Warnung vor giftigen Substanzen

WARNING

Beryllium Oxid

WARNING

Es dürfen nur Ersatzsicherungen vom gleichen Typ mit den korrekten Spezifikationen
entsprechend der Stromaufnahme des Gerätes verwendet werden. Siehe hierzu die Leistungsdaten
(Performance Data) in Kapitel 1.

In einigen Bauelementen dieses Geräts können Epoxyharze oder andere Materialien enthalten sein,
die im Brandfall giftige Gase erzeugen. Bei der Entsorgung müssen deshalb entsprechende
Vorsichtsmaßnahmen getroffen werden.

Beryllium Oxid wird in einigen Bauelementen verwendet.
Bei inkorrekter Handhabung kann dieses Material Gesundheitsschäden verursachen. Siehe hierzu

die Hinweise zur Handhabung im Service-Handbuch.

Beryllium Kupfer

In diesem Gerät sind einige mechanische Komponenten aus Berylium Kupfer gefertigt. Dies ist
eine Verbindung welche aus einem Berylliumanteil von ca. 5 % besteht. Bei normaler
Verwendung besteht kein Gesundheitsrisiko.

Das Metall darf nicht bearbeitet, geschweißt oder sonstiger Wärmebehandlung ausgesetzt werden.
Es muß als Sondermüll entsorgt werden.
Es darf nicht durch Verbrennung entsorgt werden.

WARNING

Schweres Gerät

Das Gewicht dieses Geräts liegt über der 18 kg (40 lb) Grenze für Transport durch eine einzelne
Person. Zur Vermeidung von Verletzungen sollten vor einem Transport die Arbeitsumgebung und
die persönlichen Möglichkeiten im Verhältnis zur Last abgewogen werden, wie in der
EU-Regelung 90/269/EEC und nationalen Normen beschrieben.

xii

PRECAUTIONS

WARNING

Schrägstellung

Bei Schrägstellung des Geräts sollten aus Stabilitätsgründen keine anderen Geräte darauf gestellt
werden.

Eignung für Gebrauch

Dieses Gerät wurde von Aeroflex entwickelt und hergestellt um HF Signale geringer Leistung zum
Test von Kommunikationseinrichtungen zu erzeugen. Sollte das Gerät nicht auf die von Aeroflex
vorgesehene Art und Weise verwendet werden, kann die Schutzfunktion des Gerätes
beeinträchtigt werden.

Aeroflex hat keinen Einfluß auf die Art der Verwendung und übernimmt keinerlei Verantwortung
bei unsachgemässer Handhabung.

xiii

PRECAUTIONS

Precauzioni

Questi termini vengono utilizzati in questo manuale con significati specifici:

WARNING

riportano informazioni atte ad evitare possibili pericoli alla persona.

riportano informazioni per evitare possibili pericoli all'apparecchiatura.

riportano importanti informazioni di carattere generale.

Simboli di pericolo

Il significato del simbolo di pericolo riportato sugli strumenti e nella documentazione è il
seguente:

Simbolo Tipo di pericolo

Fare riferimento al manuale operativo quando questo
simbolo è riportato sullo strumento. Rendervi conto della
natura del pericolo e delle precauzioni che dovrete
prendere.

Pericolo sostanze tossiche

Condizioni generali d'uso.

Questo prodotto è stato progettato e collaudato per rispondere ai requisiti della direttiva
IEC/EN61010-1 'Safety requirements for electrical equipment for measurement, control and
laboratory use' per apparati di classe I portatili e per l'uso in un ambiente inquinato di grado 2.
L'apparato è stato progettato per essere alimentato da un alimentatore di categoria II.

Lo strumento deve essere protetto dal possibile ingresso di liquidi quali, ad es., acqua, pioggia,
neve, ecc. Qualora lo strumento venga portato da un ambiente freddo ad uno caldo, è importante
lasciare che la temperatura all'interno dello strumento si stabilizzi prima di alimentarlo per evitare
formazione di condense. Lo strumento deve essere utilizzato esclusivamente nelle condizioni
ambientali descritte nel capitolo 1 'Performance Data' del manuale operativo.

Questo prodotto non è stato approvato per essere usato in ambienti pericolosi o applicazioni
medicali. Se lo strumento deve essere usato per applicazioni particolari collegate alla sicurezza
(per esempio applicazioni militari o avioniche),occorre che una persona o un istituto competente
ne certifichi l'uso.

WARNING

Pericoli da elettricità (alimentazione c.a.)

Quest' apparato è provvisto del collegamento di protezione di terra e rispetta le norme di sicurezza
IEC, classe 1. Per mantenere questa protezione è necessario che il cavo, la spina e la presa
d'alimentazione siano tutti provvisti di terra.

Il circuito d'alimentazione contiene dei filtri i cui condensatori possono restare carichi anche dopo
aver rimosso l'alimentazione. Sebbene l'energia immagazzinata è entro i limiti di sicurezza,
purtuttavia una leggera scossa può essere avvertita toccando i capi della spina subito dopo averla
rimossa.

Non rimuovete mai le coperture perché così potreste provocare danni a voi stessi. Non vi sono
all’interno parti di interesse all’utilizzatore.

Tutte gli interventi sono di competenza del personale qualificato. Vedi elenco internazionale dei
Centri di Assistenza in fondo al manuale.

xiv

Fusibili

PRECAUTIONS

Notare che un fusibile è posto sul filo caldo del cavo di alimentazione. Qualora l’alimentazione
avvenga tramite due poli non polarizzati, è possibile che il fusibile vada a protezione del neutro
per cui anche in caso di una sua rottura, l’apparato potrebbe restare sotto tensione.

WARNING

Pericolo d'incendio

WARNING

Pericolo sostanze tossiche

WARNING

Berillio

Assicurarsi che, in caso di sostituzione, vengano utilizzati solo fusibili della portata e del tipo
prescritto.

Se viene usata una spina con fusibili, assicurarsi che questi siano di portata adeguata coi requisiti
di alimentazione richiesti dallo strumento. Tali requisiti sono riportati nel cap. 1 "Performance
data".

Alcuni dei componenti usati in questo strumento possono contenere resine o altri materiali che, se
bruciati, possono emettere fumi tossici. Prendere quindi le opportune precauzioni nell'uso di tali
parti.

Berillio (ossido di berillio) è utilizzato nella costruzione di alcuni componenti di quest'apparato.
Questo materiale, se maneggiato non correttamente, può causare danni alla salute. Far riferimento

ai capitoli di manutenzione del Manuale di Servizio per le precauzioni richieste.

WARNING

Rame berillio

Alcuni componenti meccanici in questo strumento sono realizzati in rame berillio. Si tratta di una
lega con contenuto di berillio di circa il 5%, che non presenta alcun rischio in usi normali.

Questo materiale non deve essere lavorato, saldato o subire qualsiasi processo che coinvolge alte
temperature.

Deve essere eliminato come "rifiuto speciale". Non deve essere eliminato tramite "inceneritore".

WARNING

Strumento pesante

Il peso di questo strumento supera i 18 kg (40 lb) raccomandati come limite per il trasporto
manuale da parte di singola persona. Per evitare rischi di danni fisici è bene quindi considerare il
carico complessivo, le condizioni del trasporto e le capacità individuali in accordo con la direttiva
comunitaria 90/269/EEC e con eventuali regolamenti locali.

xv

PRECAUTIONS

WARNING

Posizionamento inclinato

Quando lo strumento è in posizione inclinata è raccomandato, per motivi di stabilità, non
sovrapporre altri strumenti.

Caratteristiche d’uso

Questo strumento è stato progettato e prodotto da Aeroflex generare segnali RF in bassa potenza
per provare apparati di radio comunicazione. Se lo strumento non è utilizzato nel modo
specificato da Aeroflex, le protezioni previste sullo strumento potrebbero risultare inefficaci.

Aeroflex non può avere il controllo sull’uso di questo strumento e non può essere ritenuta
responsabile per eventi risultanti da un uso diverso dallo scopo prefisso.

xvi

Estos términos tienen significados específicos en este manual:

WARNING

contienen información referente a prevención de daños personales.

contienen información referente a prevención de daños en equipos.

contienen información general importante.

Símbolos de peligro

El significado de los símbolos de peligro en el equipo y en la documentación es el siguiente:

Símbolo Naturaleza del peligro

PRECAUTIONS

Precauciones

Vea el manual de funcionamiento cuando este símbolo
aparezca en el instrumento. Familiarícese con la
naturaleza del riesgo y con las acciones que deban de
tomarse.

Aviso de toxicidad

Condiciones generales de uso

Este producto ha sido diseñado y probado para cumplir los requerimientos de la normativa
IEC/EN61010-1 "Requerimientos de la normativa para equipos eléctricos de medida, control y uso
en laboratorio", para equipos clase II portátiles y para uso en un ambiente con un grado de
contaminación 2. El equipo ha sido diseñado para funcionar sobre una instalación de alimentación
de categorías II.

Debe protegerse el equipo de la entrada de líquidos y precipitaciones como nieve, lluvia, etc.
Cuando se traslada el equipo de entorno frío a un entorno caliente, es importante aguardar la
estabilización el equipo para evitar la condensación. Sólo debe utilizarse el aparato en las
condiciones ambientales especificadas en el capítulo 1 "Especificaciones" o "Performance Data"
del Manual de Instrucciones/Manual de Operación/Funcionamiento.

Este producto no ha sido aprobado para su utilización en entornos peligrosos o en aplicaciones
médicas. Si se va a utilizar el equipo en una aplicación con implicaciones en cuanto a seguridad,
como por ejemplo aplicaciones de aviónica o militares, es preciso que un experto competente en
materia de seguridad apruebe su uso.

WARNING

Nivel peligroso de electricidad (tensión de red)

Este equipo cumple las normas IEC Seguridad Clase 1, lo que significa que va provisto de un
cable de protección de masa. Para mantener esta protección, el cable de alimentación de red debe
de conectarse siempre a una clavija con terminal de masa.

Tenga en cuenta que el filtro de red contiene condensadores que pueden almacenar carga una vez
desconectado el equipo. Aunque la energía almacenada está dentro de los requisitos de seguridad,
pudiera sentirse una ligera descarga al tocar la clavija de alimentación inmediatamente después de
su desconexión de red.

No retire las cubiertas del chasis del instrumento, ya que pudiera resultar dañado personalmente.
No existen partes que puedan ser reparadas en su interior.

Deje todas las tareas relativas a reparación a un servicio técnico cualificado. Vea la lista de
Centros de Servicios Internacionales en la parte trasera del manual.

Fusibles

Se hace notar que el fusible de alimentación interno está enserie con el activo del cable de
alimentación a red. Si la clavija de alimentación de red cuenta con sólo dos terminales sin

xvii

PRECAUTIONS

polaridad, el fusible puede pasar a estar en serie con el neutro, en cuyo caso existen partes del
equipo que permanecerían a tensión de red incluso después de que el fusible haya fundido.

WARNING

Peligro de incendio

WARNING

Aviso de toxicidad

WARNING

Berilio

Asegúrese de utilizar sólo fusibles del tipo y valores especificados como recuesto.
Si se utiliza una clavija con fusible incorporado, asegúrese de que los valores del fusible

corresponden a los requeridos por el equipo. Ver sección de especificaciones del capítulo 1 para
comprobar los requisitos de alimentación.

Alguno de los componentes utilizados en este equipo pudieran incluir resinas u otro tipo de
materiales que al arder produjeran sustancias tóxicas, Por tanto, tome las debidas precauciones en
la manipulación de esas piezas.

Berilio (óxido de berilio) Este material es utilizado en la fabricación de alguno de los componentes
de este equipo.

Si se manipulase incorrectamente podria causar daños a la salud − En la sección de mantenimiento
y reparación encontrará normas de manejo de seguridad.

WARNING

Berilio-cobre

Algunos componentes mecánicos contenidos en este instrumento incorporan berilio-cobre en su
proceso de fabricación. Se trata de una aleación con un contenido aproximado de berilio del 5%, lo
que no representa ningún riesgo durante su uso normal.

El material no debe ser manipulado, soldado, ni sometido a ningún proceso que implique la
aplicación de calor.

Para su eliminación debe tratarse como un "residuo especial". El material NO DEBE eliminarse
mediante incineración.

WARNING

Instrumento pesado

WARNING

Tener en cuenta con el equipo Inclinado

El peso de este instrumento excede de los 18 Kg (40 lb), lo que debe tenerse en cuenta si va ser
transportado manualmente por una sola persona. Para evitar el riesgo de lesiones, antes de mover
el equipo deberá evaluar la carga, el entorno de trabajo y la propia capacidad, de acuerdo con la
Directiva Europea 90/269/EEC y el Reglamento Nacional Asociado.

Si utiliza el equipo en posición inclinada, se recomienda, por razones de estabilidad, no apilar
otros equipos encima de él.

xviii

Idoneidad de uso

Este equipo ha sido diseñado y fabricado por Aeroflex para generar señales de VHF y UHF de
bajo nivel de potencia para prueba de equipos de radiocomunicaciones.

Si el equipo fuese utilizado de forma diferente a la especificada por Aeroflex, la protección
ofrecida por el equipo pudiera quedar reducida.

Aeroflex no tiene control sobre el uso de este equipo y no puede, por tanto, exigirsele
responsabilidades derivadas de una utilización distinta de aquellas para las que ha sido diseñado.

PRECAUTIONS

xix

Chapter 1

GENERAL INFORMATION

Contents

Introduction ................................................................................................................................. 1-2

Main features ............................................................................................................................... 1-3

Operation.............................................................................................................................. 1-3

Display ................................................................................................................................. 1-3

Frequency selection.............................................................................................................. 1-3

Output................................................................................................................................... 1-3

Modulation ........................................................................................................................... 1-3

Incrementing......................................................................................................................... 1-4

Frequency sweep .................................................................................................................. 1-4

Memory ................................................................................................................................ 1-4

Programming........................................................................................................................ 1-4

Calibration data .................................................................................................................... 1-5

Spectral purity ...................................................................................................................... 1-5

Calibration............................................................................................................................ 1-5

Performance data ......................................................................................................................... 1-6

Versions, options and accessories ............................................................................................. 1-11

List of figures

Fig. 1-1 2026Q simplified block diagram................................................................................... 1-2

1-1

Introduction

The 2026Q CDMA Interferer MultiSource Generator is a purpose-built instrument for testing
CDMA handset and base station equipment. It features two synthesized RF signal sources with
both independent and combined RF outputs. An RF input is provided which enables the output
from a radio test set (or external RF signal generator) to be combined with the two internal signal
sources. The combined RF output provides a path to and from the radio under test and an
appropriate CDMA radio test set. Each signal source covers the frequency range 10 kHz to

2.4 GHz, whilst the combined path covers the range 800 MHz to 2.0 GHz.

It is designed to produce a fully calibrated combined RF output containing any combination of
internally generated interference signals from its two RF sources, together with a calibrated signal
path for a radio test set transmit output. A return path from the transceiver back to the radio test
set receiver input is also provided through the instrument (see Fig. 1-1 below).

Rear

panel

SOURCE A

SOURCE B

GENERAL INFORMATION

2026Q

COMBINER

Σ

-6 dB

4-WAY 0

COMBINER

SPLITTER

B

RF OUTPUT

A

°

RF OUTPUT

Front
panel

INPUT FROM

RADIO TEST SET

50 Ω

CONNECTION

TO RADIO

OUTPUT TO

RADIO TEST SET

-6 dB

ATTENUATOR/AMPLIFIER MODULE

-15 dB

50 Ω

Σ

-6 dB

C3702

Fig. 1-1 2026Q simplified block diagram

The instrument provides frequency hand-offs without RF switching which allows a CDMA
receiver to be tested for sensitivity in the presence of dual tone interference and in accordance with
IS95A. This is specifically aimed at testing the receiver’s ability to successfully hand off to other
radio channels and between cellular and PCS bands. The interfering signals are combined without
the need for any RF switching mechanism that would otherwise affect the test result.

The 2026Q is configured to ensure high levels of isolation between each of the transmit and
receive paths between the radio test set, the interfering signal sources and the transceiver under
test.

Path loss test data is supplied with the instrument for the frequency bands 865 to 895 MHz and
1750 to 1990 MHz. Drift influences within these bands is minimal ensuring a level accuracy of
better than ±0.25 dB. The frequency response across each of these bands is flat to within ±0.1 dB,
thus minimizing the need for additional system calibration.

The 2026Q used as a multisource signal generator offers as standard two signal sources in one
instrument, each of which is a fully functional modulated signal generator. Each source can
either be routed to its own individual RF output or switched to the input of an RF combiner

1-2

network before being fed to a separate combined RF output. Both sources cover the full frequency
range of 10 kHz to 2.4 GHz with an output power of between −137 and +24 dBm.

Each signal source can be controlled independently in frequency and level, and each has its own
amplitude, frequency, phase, FSK and pulse modulation capability. All parameters can be entered
from the front-panel keyboard and a rotary control can be used to adjust most settings.

The instrument is provided with built-in tests specifically for use with two or three combined
sources such as for amplifier and receiver intermodulation tests and receiver selectivity tests. The
sources may be locked together, offset in frequency (additionally with a harmonic or sub-harmonic
relationship) as well as level.

Microprocessor control ensures that the instrument is flexible and easy to use and allows
programming by the General Purpose Interface Bus (GPIB) or RS-232 serial bus. The GPIB is
designed to IEEE Standard 488.2 and is a means of sending commands to an instrument, via a data
bus, from a remote controller or personal computer. The instrument can therefore be used
manually or as part of a fully automated test system.

Main features

Operation

Selection of parameters on the screen may involve one or more of the numeric, hard or menu
selection keys or the rotary control knob. Parameters may be set to specific values by numeric key

entry, while values may be varied in steps of any size using the [
moving the control knob, set to a particular sensitivity.

GENERAL INFORMATION

Ø][×] keys or altered by

Display

The display is a dot-matrix liquid-crystal panel, with backlighting. Display contrast and brightness
may be varied to accommodate differing lighting conditions and the setting saved in memory.

Frequency selection

Carrier frequency is either selected directly via the keyboard or remotely via the interfaces.
Frequency resolution is 1 Hz across the complete frequency range of 10 kHz to 2.4 GHz. A series
of carrier frequencies can be stored in non-volatile memory for recall when required.

Output

Peak RF output levels from each signal source of up to +24 dBm can be set up to 1.2 GHz
(+20 dBm up to 2.4 GHz) by direct keyboard entry with a resolution of 0.1 dB down to

−137 dBm. The peak output level from the combiner is −3 dBm, 800 MHz to 2 GHz. RF
ON/OFF keys are provided to disable each individual output as well as the combined output.

A choice of level units is available to the user and provision is made for the conversion of units
(for example, dBm to µV) by a simple key-press.

An electronic trip protects each independent signal source output against reverse power of up to
50 W. This prevents damage to output circuits when RF transmitter or DC power supply is
accidentally applied to an RF OUTPUT connector.

To facilitate testing of receiver squelch systems, an attenuator hold function allows control of the
RF output without introducing RF level drop-outs from the step attenuator.

Modulation

Comprehensive amplitude, frequency and phase modulations are available. Pulse modulation can
be applied to the carrier from an external pulse source. The instrument also produces FSK
modulated outputs. An internal modulation oscillator is provided, having a frequency range
of 0.01 Hz to 20 kHz. Sine, triangle and square waveforms are available. The oscillator is capable
of generating one or two modulation tones simultaneously in one modulation channel. A BNC
connector on the front panel offers access to the internal LP signal as well as providing an input
for external modulation signals to be combined with the internal signals. These sources can be

1-3

combined to give a number of modulation modes. The pulse modulation can be used in
combination with the other forms of modulation.

The frequency modulation range provides a 1 dB bandwidth of typically 100 kHz and provides
FM deviation of 0 to 100 kHz. AC or DC coupled FM can be selected. Phase modulation is
provided with a 3 dB bandwidth of 10 kHz and deviation range of 0 to 10 radians.

Amplitude modulation with a 1 dB bandwidth of typically 30 kHz and with modulation depths of
up to 99.9% is available with a resolution of 0.1%. Pulse modulation is available as standard with
typical rise and fall times of less than 10 µs and 40 dB on/off ratio.

The instrument also accepts one or two logic level inputs to produce a 2-level or 4-level FSK
modulated output. The required FM deviation is set by keyboard entry.

The external input voltage required for specified modulation is 1 V RMS (1.414 V peak). To
accommodate other signal levels, Automatic Level Control (ALC) can be selected which provides
correctly calibrated modulation for inputs between 0.75 and 1.25 V RMS.

A modulation ON/OFF soft key simplifies the testing of signal-to-noise ratio.

Incrementing

All major parameters can be incremented or decremented in step sizes entered via keyboard entry
or remotely. If no step size is entered for a parameter, the steps are preset to 1 kHz for carrier
frequency, 1 kHz for modulation oscillator, 1 kHz for FM deviation, 0.1% for AM depth, 0.01 rad
for 1 dB for output level.

In addition, the rotary control knob can be used to vary the parameter with the sensitivity of the
knob being changed by means of the [×10] and [÷10] keys.

Control knob operation can be assigned for the adjustment of one parameter, while another
parameter is adjusted by the increment and decrement keys. By this means two parameters, for
example carrier frequency and RF level, can be adjusted simultaneously.

GENERAL INFORMATION

Frequency sweep

The sweep capability of the instrument allows comprehensive testing of systems. Four parameters
are used to specify sweep: start, stop, step size and time per step, all of which may be specified by
the user. The sweep can be paused at any time and the frequency and level altered manually.
During the sweep the RF level can be altered using the rotary control. Sweep triggering can be
single-shot or continuous and can be initiated directly or on the detection of a trigger. The
triggering signal may either be programmed or from a TTL signal applied to the rear-panel
TRIGGER 1 input. When frequency coupling is enabled, the coupled sources will track with the
swept source.

Memory

The instrument provides both non-volatile and volatile memory for storing instrument settings.
The non-volatile memory provides 100 full instrument settings and 100 settings of carrier
frequency only. The volatile memory (RAM) also provides 100 instrument settings. Any one of
the non-volatile instrument settings can be selected as the power-up setting for the instrument.

Software protection

To prevent accidental interference with the contents of internal memories, internal data is
protected.

Programming

A GPIB interface is fitted so that all functions are controllable via the interface bus which is
designed to the IEEE Standard 488.2. The instrument can function both as talker and listener.
The instrument also has an RS-232 interface which uses the common GPIB command set to
control the instrument and also allow new software upgrades or applications to be downloaded
into the instrument.

1-4

Calibration data

All alignment data is derived digitally. Realignment can be undertaken, without removing covers,
by protected front-panel functions or via the GPIB interface.

Spectral purity

With an SSB phase noise performance of typically −121 dBc/Hz at 20 kHz offset from a 1 GHz
carrier, these instruments can be used for both in-channel and adjacent channel receiver
measurements. Harmonically-related signals and non-harmonics are typically better than −30 dBc
and −60 dBc respectively.

Calibration

This instrument has a recommended two-year calibration interval after which it should be returned
for recalibration (for addresses refer to ‘International Service Centers’ section at end of manual).

GENERAL INFORMATION

1-5

Performance data

Carrier frequency

Range

Individual outputs:

Combined output:

Accuracy: As frequency standard.

RF output

Range

Individual outputs:

Combiner output:

Resolution: 0.1 dB or 3 digits for linear units.

RF level units:

GENERAL INFORMATION

10 kHz to 2.4 GHz with a resolution of 1 Hz.

800 MHz to 2.0 GHz with a resolution of 1 Hz.

−137 dBm to +24 dBm (output power above +20 dBm is uncalibrated
for frequencies above 1.2 GHz).

−137 dBm to −3 dBm (output power above −7 dBm is uncalibrated for
frequencies above 1.2 GHz).

Maximum output is reduced by 5 dB when pulse modulation is
selected and/or by up to 6 dB when AM is selected, dependent upon
set AM depth.

Units may be set to µV, mV, EMF or PD; dB relative to 1 µV, 1 mV,
EMF or PD; or dBm. Conversion between dB and linear units may be
achieved by pressing the appropriate units key (dB or V, mV, µV). The
output level can be normalized for 75 Ω operation with an external
impedance converter (applies to all outputs simultaneously).

Accuracy:

Individual outputs:
(over a temperature range
of 17°C to 27°C)

*Accuracy is unspecified below 100 kHz for levels >6 dBm.

Combined output:
(over a temperature range
of 17°C to 27°C)

Attenuator hold: Inhibits operation of the step attenuator from the level at which the key

VSWR

Individual outputs:

Output connector

Output protection

Individual outputs:

Combined output:

Radio Connections

Path loss

INPUT FROM RADIO TEST
SET to CONNECTION TO
RADIO:

CONNECTION TO RADIO to
OUTPUT TO RADIO TEST SET:

Isolation

VSWR

INPUT FROM RADIO TEST
SET:

Output level Up to 1.2 GHz Above 1.2 GHz

−127 dBm to <6 dBm
>6 dBm to 24 dBm*
Temperature stability

For output levels from −20 dBm to −35 dBm:
±0.75 dB, 865 MHz−895 MHz;
±0.75 dB, 1750 MHz−1990 MHz.

is enabled. Usable for a level reduction of at least 10 dB. Typical
accuracy ±3 dB.

For output levels <−5 dBm, output VSWR is less than 1.5:1 for carrier
frequencies up to 1.2 GHz and <1.7:1 for carrier frequencies up to

2.4 GHz.

Ω type-N connector to MIL 390123D.

50

Protected against the application of reverse power to the output
connector for levels up 50 W from 50

of 5:1. Protection circuit can be reset from the front panel or via the
GPIB interface.

No reverse power protection.

Typically 14 dB, 865 to 895 MHz;
15 dB, 1750 to 1990 MHz.

A mean calibration value subject to a frequency response of <±0.1 dB
across the frequency bands 865 to 895 MHz, 1750 to 1780 MHz and
1930 to 1990 MHz is supplied with each instrument. A measurement
uncertainty of ±0.25 dB applies to each path loss.

Typically 13.5 dB

>40 dB from CONNECTION TO RADIO to INPUT FROM RADIO TEST
SET with OUTPUT TO RADIO TEST SET terminated.

<1.2:1, 865 to 895 MHz;
<1.35:1, 1750 to 1990 MHz.

±0.8 dB
±1.0 dB

<±0.02 dB/°C

Ω, or 25 W from a source VSWR

±1.6 dB
±2.0 dB

<±0.04 dB/°C

1-6

GENERAL INFORMATION

CONNECTION TO RADIO: <1.6:1 (typically 1.25:1), 865 to 1990 MHz.

OUTPUT TO RADIO TEST
SET

Maximum safe power (matched)

INPUT FROM RADIO TEST
SET

CONNECTION TO RADIO: +33 dBm.

OUTPUT TO RADIO TEST
SET:

Spectral purity

Harmonics:

Individual outputs:

Combined output:

Non-harmonics:

Isolation:

Intermodulation:

Residual FM (FM off): Less than 4.5 Hz RMS deviation in a 300 Hz to 3.4 kHz unweighted

SSB phase noise:

RF leakage:

Modulation

Frequency modulation

Deviation range: 0 to 100 kHz.

Resolution: 3 digits or 1 Hz.

Accuracy:

Bandwidth (1 dB): DC to 100 kHz (DC coupled);

Group delay:

Carrier frequency offset: Less than 1% of the set frequency deviation when DC coupled.

Distortion:

FSK

Modes:

Data source:

Frequency shift:

<1.35:1, 865 to 1990 MHz.

+19 dBm.

+33 dBm.

Typically better than −30 dBc for RF levels up to +6 dBm, typically better
than −25 dBc for RF levels up to +18 dBm (+14 dBm above 1.2 GHz).

Typically better than −30 dBc for RF levels up to −36 dBm, typically
better than −25 dBc for RF levels up to −13 dBm.

Better than −70 dBc for carrier frequencies up to 1 GHz;
better than −64 dBc for carrier frequencies above 1 GHz;
better than −60 dBc for carrier frequencies above 2 GHz.

Better than 80 dB between individual outputs in use.
Better than 60 dB from a used individual output to the CONNECTION
TO RADIO.

At an RF output level of −22 dBm at the CONNECTION TO RADIO:

Frequency: 2-tone intermodulation:

800 MHz to 2 GHz −80 dBc

Intermodulation levels reduce with reducing RF levels.

bandwidth at a carrier frequency of 1 GHz.

Typically less than 1 Hz at 249 MHz; less than <3 Hz at 1001 MHz.

Better than −124 dBc/Hz at 20 kHz offset from a 470 MHz carrier.
Typically better than −121 dBc/Hz at 20 kHz offset from a 1 GHz carrier.

Less than 0.5 µV at the carrier frequencies into a two-turn
25 mm-diameter loop 25 mm from the surface of the signal generator.

FM, AM or phase modulation can be applied to the carriers generated
by each signal source from independent internal or external modulation
sources. The internal modulation sources are capable of generating
two simultaneous signals into any one of the modulation channels.
Each internal and external modulation source can be simultaneously
enabled to produce combined amplitude and frequency (or phase)
modulation. Pulse modulation can be applied to each of the carriers
from external pulse sources. The pulse modulation can be used in
combination with the other forms of modulation. 2-level or 4-level FSK
modulation can be applied to each carrier using data from an external
source.

±5% of set depth at 1 kHz modulation rate.

10 Hz to 100 kHz (AC coupled);
20 Hz to 100 kHz (AC coupled with ALC).

Less than 5 µs to 100 kHz.

Less than 1% at 1 kHz rate for deviations up to 100 kHz, typically ≤0.3%
at 1 kHz rate for deviations up to 10 kHz.
(For carrier frequencies below 50 MHz: less than 3% at 1 kHz rate and
deviations up to 100 kHz.)

2-level or 4-level FSK.

External data via rear panel 25-way D-type connector.

Settable up to ±100 kHz.

1-7

GENERAL INFORMATION

Accuracy:

Timing jitter:

Filter:

Phase modulation

Range:

Resolution:

Accuracy:

Bandwidth (3 dB):

Distortion:

Amplitude modulation

(for carrier frequencies <500 MHz,
usable to 1.5 GHz)

Range:

Resolution:

Accuracy

(over temperature range 17°C to

27°C):

Bandwidth (1 dB):

Distortion:

ΦM on AM:

As FM deviation accuracy.

±3.2 µs.

th

-order Bessel, −3 dB at 3.9 kHz.

8

0 to 10 radians.

3 digits or 0.01 radians.

±5% of indicated deviation at 1 kHz modulation rate (excluding residual
phase modulation).

100 Hz to 10 kHz.

Less than 3% at 10 radians at 1 kHz.
Typically <0.5% for deviations up to 1 radian at 1 kHz.

0 to 99.9%.

0.1%.

±5% of set depth at 1 kHz rate for output levels not exceeding +10 dBm
(−22 dBm at the combiner output).
Temperature coefficient <0.02% per °C.

DC to 30 kHz (DC coupled);
10 Hz to 30 kHz (AC coupled);
20 Hz to 30 kHz (AC coupled with ALC).

<1.5% at 1 kHz rate for modulation depths up to 30%;
<2.5% at 1 kHz rate for modulation depths up to 80%
for output levels not exceeding +10 dBm (−22 dBm at the combiner
output).

Typically 0.1 radians at 30% depth at 470 MHz.

Pulse modulation

Carrier frequency range:

RF level range:

RF level accuracy:

Input:

On-off ratio:

Rise and fall time:

Overshoot:

Modulation oscillator

Frequency range:

Resolution:

Frequency accuracy:

Distortion:

Waveforms:

Output:

External modulation input A front panel external modulation input/output BNC connector is

Input level:

Input impedance:

32 MHz to 2.4 GHz, usable to 10 MHz.

Maximum guaranteed output is reduced by 5 dB when pulse modulation
is selected.

Maximum additional uncertainty is ±0.5 dB.

Front panel BNC connector with an input impedance of 10 k Ω nominal. A
logical ‘1’ (3.5 to 5 V) turns the carrier on, a logical ‘0’ (0 to 1 V) turns
the carrier off. Maximum input is ±15 V.

Better than 40 dB;
better than 45 dB below 1.2 GHz.

Less than 10 µs.

Less than 1 dB.

The internal modulation oscillator on each signal source is capable of
generating one or two modulation tones simultaneously in one
modulation channel.

0.01 Hz to 20 kHz.

0.01 Hz.

As frequency standard.

Less than 0.1% THD at 1 kHz.

Sine to 20 kHz, triangle or square wave to 3 kHz.
Square wave jitter less than 6.4 µs on any edge.

The modulation oscillator signal is available from the external
modulation input/output connector at a nominal level of 2 V RMS EMF
from a 600 Ω source impedance. This signal is not available when the
connector is being used as an input.

provided.

1 V RMS (1.414 V peak) sine wave for set deviation. Maximum safe
input is ±15 V.

100 kΩ nominal.

1-8

GENERAL INFORMATION

Modulation ALC:

Levels the applied external modulation over the range 0.75 to 1.25 V
RMS. High and low indicators in display indicate when the input is
outside leveling range.

Sweep mode

Any or all of the sources may be set to a carrier frequency sweep mode.
The sweeps are defined by entry of the start, stop and step frequencies.
A common step time can be set from 50 ms to 10 s per step. A
common trigger input at a rear-panel BNC connector may be used to
trigger a step or a complete sweep. Sweep can also be set to
continuous.

Frequency standard The carrier frequency and internal modulation frequency are

synthesized from either an internal reference oscillator or an external
reference.

Internal standard:

Aging rate:

Temperature stability:

Warm-up time:

10 MHz OCXO.

7

±2.5 in 10
±5 in 10

per year.

9

per day after 2 months’ continuous use.

Better than ±7 in 10

7

Within 2 in 10

of final frequency 10 minutes after switch on at a

8

over the temperature range 0 to 50°C.

temperature of 20°C.

External input:

Requires an input of 220 mV RMS to 1.8 V RMS into 1 kΩ on rear-panel
BNC connector. Input frequency can be 1 MHz or 10 MHz.

External output:

Rear-panel BNC socket provides an output of 10 MHz at a nominal level
of 2 V pk-pk into 50 Ω.

Remote control

GPIB: All standard signal generator functions except the supply switch are

remotely programmable.

Capabilities:

Complies with the following subsets as defined in IEEE Std 488.1: SH1,
AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, C0, E2.

RS-232: All standard signal generator functions except the supply switch are

remotely programmable.

Connector is 9-way male D-type, baud rate 300 to 9600 bits per second.

Handshake hardware is DTR, RTS, CTS and DSR, and software is
XON and XOFF.

Electrical interface is to EIA-232-D.

Electromagnetic compatibility

Conforms with the protection requirements of the EEC Council Directive
89/336/EEC

Conforms with the limits specified in the following standards:
IEC/EN 61326-1 : 1997, RF Emission Class B,
Immunity Table 1, Performance Criterion B

Safety

Conforms with the requirements of EEC Council Directive 73/23/EEC
(as amended) and the product safety standard IEC/EN 61010-1 : 2001 +
C1 : 2002 + C2 : 2003 for Class 1 portable equipment, for use in a
Pollution Degree 2 environment. The instrument is designed to operate
from an Installation Category 2 supply.

Rated range of use

Temperature

Humidity

Altitude

Conditions of storage and transport

Temperature

Humidity

Altitude

Power requirements

Calibration interval

(over which full specification is met unless otherwise indicated).

0°C to +55°C.

Up to 93% at 40°C.

Up to 3050 m (10 000 ft).

−40°C to +71°C.

Up to 93% at 40°C.

Up to 4600 m (15 000 ft).

Voltage: 100 to 240 V~ (limit 90 to 264 V~)
Frequency: 50 to 60 Hz (limit 45 to 66 Hz)
Power consumption: 250 VA maximum.

Recommended 2 years. Realignment can be accomplished by GPIB

1-9

GENERAL INFORMATION

control or from the front panel. There are no mechanical adjustments
required for realignment.

Dimensions and weight

Height Width Depth Weight

177 mm 419 mm 488 mm <17 kg

1-10

GENERAL INFORMATION

Versions, options and accessories

When ordering please quote the full ordering number information.

Ordering numbers Versions

2026Q 800 MHz to 2 GHz CDMA Interferer MultiSource Generator

Supplied with

46882/361 Operating manual (this manual).

− AC power supply lead (see ‘Power cords’, Chapter 2).

Optional accessories

46882/295 Maintenance manual.

46880/087 Service manual (consists of operating manual (this document) plus

maintenance manual).

43129/189 GPIB lead assembly, 1.5 m.

46884/649 RS-232 cable, 9-way female to 25-way female, 1.5 m.

46884/650 RS-232 cable, 9-way female to 9-way female, 1.5 m.

46884/293 Rack-mounting kit (with slides) for rack cabinets with depths from

480 to 680 mm.

46884/294 Rack-mounting kit (with slides) for rack cabinets with depths from

680 to 840 mm.

46884/931 Rack-mounting kit containing front mounting brackets only.

46662/614 Soft carrying case.

1-11

EC Declaration of Conformity

Certificate Ref. No.: DC219

The undersigned, representing:

GENERAL INFORMATION

Manufacturer:

Address:

Aeroflex International Ltd.

Longacres House, Six Hills Way,
Stevenage, Hertfordshire, UK SG1 2AN

Herewith declares that the product:

Equipment Description:

Model No.

Options:

2026Q

–

CDMA Interferer/MultiSource Generator

is in conformity with the following EC directive(s)
(including all applicable amendments)

Reference No.

73/23/EEC

89/336/EEC

Title:

Low Voltage Directive

EMC Directive

and that the standards and/or technical specifications referenced below have been applied:

Safety:

IEC/EN61010-1 : 2001 + C1 : 2002 + C2 : 2003

EMC:

IEC/EN 61326-1:1997 + A1 : 1998 + A2 : 2001

RF Emission Class B, Immunity Table 1 and Performance Criterion B

Qualifying Notes:

Aeroflex Stevenage

Robert Trott — Director of Product Assurance

(Place)

(Signature)

23 December 2003

(Date)

1-13

Contents

Chapter 2

INSTALLATION

Mounting arrangements................................................................................................................. 2-2

Installation requirements ............................................................................................................... 2-2

Ventilation.............................................................................................................................. 2-2

Class I power cords ................................................................................................................ 2-2

Goods-in checks ............................................................................................................................ 2-5

Connecting to supply..................................................................................................................... 2-5

Fuse ........................................................................................................................................ 2-5

General purpose interface bus (GPIB)........................................................................................... 2-5

GPIB cable connection...........................................................................................................2-5

GPIB connector contact assignments ..................................................................................... 2-6

IEEE to IEC conversion ......................................................................................................... 2-6

Interface bus connection......................................................................................................... 2-7

RS-232 interface............................................................................................................................ 2-7

RS-232 connector................................................................................................................... 2-7

Auxiliary port connector................................................................................................................ 2-7

FSK operation ........................................................................................................................ 2-8

Rack mounting............................................................................................................................... 2-9

Routine safety testing and inspection ............................................................................................ 2-9

Cleaning....................................................................................................................................... 2-10

Cleaning the LCD window................................................................................................... 2-10

Putting into storage...................................................................................................................... 2-10

List of tables

Table 2-1 Auxiliary port contact assignments.............................................................................. 2-8

Table 2-2 Auxiliary port inputs for 2FSK .................................................................................... 2-8

Table 2-3 Auxiliary port inputs for 4FSK .................................................................................... 2-8

List of figures

Fig. 2-1 GPIB connector contact assignments (viewed from rear of instrument) ........................ 2-6

Fig. 2-2 IEEE to IEC conversion.................................................................................................. 2-6

Fig. 2-3 RS-232 connector (viewed from rear of instrument)...................................................... 2-7

Fig. 2-4 25-way AUXILIARY PORT connector ......................................................................... 2-7

2-1

INSTALLATION

WARNING

Initial visual inspection

After unpacking the instrument, inspect the shipping container and its cushioning material for
signs of stress or damage. If damage is identified, retain the packing material for examination by
the carrier in the event that a claim is made. Examine the instrument for signs of damage; do not
connect the instrument to a supply when damage is present, internal electrical damage could result
in shock if the instrument is turned on.

Mounting arrangements

Excessive temperatures may affect the performance of the instrument. Completely remove the
plastic cover, if one is supplied over the case, and avoid standing the instrument on or close to
other equipment which is hot.

Installation requirements

Ventilation

This instrument is forced-air cooled by a fan mounted on the rear panel. Air must be allowed to
circulate freely through the ventilator grills located on the side and underside of the instrument.
Before switching on the instrument, ensure that the fan outlet on the rear panel is not restricted
(i.e. clearance of at least 75 mm (3 in) at the rear, 25 mm (1 in) at each side, 15 mm (0.5 in) on the
underside). Failure to provide adequate clearances will increase internal temperatures and reduce
the instrument’s reliability, so that its performance may not meet specification.

Class I power cords (3-core)

General

When the equipment has to be plugged into a Class II (ungrounded) 2-terminal socket outlet, the
cable should either be fitted with a 3-pin Class I plug and used in conjunction with an adapter
incorporating a ground wire, or be fitted with a Class II plug with an integral ground wire. The
ground wire must be securely fastened to ground. Grounding one terminal on a 2-terminal socket
will not provide adequate protection.

In the event that a molded plug has to be removed from a lead, it must be disposed of immediately.
A plug with bare flexible cords is hazardous if engaged in a live socket outlet.

Power cords with the following terminations are available from IFR Ltd. Please check with your
local sales office for availability.

2-2

This equipment is provided with a 3-wire (grounded) cordset which includes a molded IEC 320
connector for connection to the equipment. The cable must be fitted with an approved plug which,
when plugged into an appropriate 3-terminal socket outlet, grounds the case of the equipment.
Failure to ground the equipment may expose the operator to hazardous voltage levels. Depending
upon the destination country, the color coding of the wires will differ:

Wire ended

INSTALLATION

Country IEC 320 plug type IFR part number

GREEN/YELLOW
EARTH

Universal Straight through 23424-158

Universal Right angled 23424-159

BROWN
LIVE

BLUE
NEUTRAL

North America Harmonized

Line (Live) Black Brown
Neutral White Blue
Ground (Earth) Green Green/Yellow

HARMONISED-WIRE ENDED

C3509

British

Country IEC 320 plug type IFR part number

United Kingdom Straight through 23422-001

United Kingdom Right angled 23422-002

The UK lead is fitted with an ASTA approved molded plug to BS 1363.
A replaceable 13 A fuse to BS 1362 is contained within the plug. This

fuse is only designed to protect the lead assembly. Never use the plug
with the detachable fuse cover omitted or if the cover is damaged.

The fuse(s) or circuit breaker to protect the equipment is fitted at the
back of the equipment.

UNITED KINGDOM

EARTH

NEUTRAL

LIVE

C3510

North American

Country IEC 320 plug type IFR part number

North American Straight through 23422-004

North American Right angled 23422-005

The North American lead is fitted with a NEMA 5-15P (Canadian
CS22.2 No 42) plug and carries approvals from UL and CSA for use in
the USA and Canada.

Continental Europe

Country IEC 320 plug type IFR part number

Europe Straight through 23422-006

Europe Right angled 23422-007

The Continental European lead is fitted with a right angle IEC83
standard C4 plug (CEE 7/7) which allows it to be used in sockets with
either a male earth pin (standard C 3b) or side earth clips (standard
C 2b) the latter is commonly called the German ‘Schuko’ plug. In
common with other Schuko style plugs, the plug is not polarized when
fitted into a Schuko socket. The lead carries approvals for use in Austria, Belgium, Finland,
France, Germany, Holland, Italy, Norway and Sweden. Note that this plug will not fit Italian
standard CEI 23-16 outlets. The lead should not be used in Denmark given that the earth
connection will not be made.

NEUTRAL

U.S./CANADA/KOREA

EARTH

NEUTRAL

EARTH

CONTINENTAL

EUROPE

EARTH

LIVE

C3511

LIVE

C3512

2-3

INSTALLATION

Français

Le câble d’alimentation d’Europe Continentale est muni d’un connecteur mâle à angle droit type
CEI83, standard C4 (CEE 7/7), qui peut être utilisé dans une prise femelle à ergot de terre
(standard C 3b) ou à clips latéraux (standard C 2b), cette dernière étant communément appelée
prise “Schuko” allemande. De la même façon que les autres connecteurs de type Schuko, celui-ci
n’est pas polarisé lorsqu’il s’adapte à une prise femelle Schuko. Ce câble d’alimentation est
homologué en Allemagne, Autriche, Belgique, Finlande, France, Hollande, Italie, Norvège et
Suède. A noter que ce connecteur n’est pas compatible avec les prises de courant italiennes au
standard CEI 23-16. Ce câble ne doit pas être utilisé au Danemark à cause du défaut de connexion
de masse.

Deutsch

Das kontinentaleuropäische Netzkabel ist mit einem rechtwinkeligen Stecker nach IEC83 C4
(CEE7/7) Standard versehen, welcher sowohl in Steckdosen mit Erde-Stift (Standard C 3b) oder
seitlichen Erdeklemmen, im allgemeinen “Schukosteckdose” genannt, paßt. Üblicherweise ist der
Schukostecker bei Verwendung in Schukosteckdosen nicht gepolt. Dieses Netzkabel besitzt
Zulassung für Österreich, Belgien, Finnland, Frankreich, Deutschland, Holland, Italien, Norwegen
und Schweden.

Hinweis: Dieser Schukostecker paßt nicht in die italienischen Standardsteckdosen nach CEI 23-16
Norm. Dieses Netzkabel sollte nicht in Dänemark verwendet werden, da hier keine
Erdeverbindung hergestellt wird.

Español

El cable de alimentación tipo Europeo Continental dispone de una clavija C4 normalizada IEC83
(CEE 7/7) que permite su utilización tanto en bases de enchufe con toma de tierra macho (tipo C
3b) o con toma de tierra mediante contactos laterales (tipo C 2b) que, en este último caso, suele
denominarse “Schuko”. Al igual que cualquier otra clavija tipo Schuko, las conexiones a red no
están polarizadas cuando se conectan a una base tipo Schuko. El cable lleva autorización para su
uso en Austria, Bélgica, Finlandia, Francia, Alemania, Holanda, Italia, Noruega y Suecia. Observe
que este cable no se adapta a la norma italiana CEI 23-16. El cable no debe utilizarse en
Dinamarca en el caso de no efectuarse conexión a tierra.

Italiano

I cavi d’alimentazione per l’Europa continentale vengono forniti terminati con una spina ad angolo
retto del tipo C4 secondo lo standard IEC83 (CEE 7/7) che può essere usato in prese in cui la terra
può essere fornita o tramite connettore maschio (C 3b) o tramite clips laterali (C 2b), quest’ultima
comunemente detta di tipo tedesca “Schuko”. Questa spina, quando collegata ad una presa
Schuko, non è polarizzata.

Il cavo può essere usato in Austria, Belgio, Finlandia, Francia, Germania, Olanda, Norvegia,
Svezia ed Italia. E’ da notare che per l’Italia questo non risponde allo standard CEI 23-16.

Questa spina non dovrebbe invece essere usata in Danimarca in quanto non realizza il
collegamento di terra.

2-4

Goods-in checks

The following goods-in check verifies that the instrument is functioning correctly, but does not
verify conformance to the listed specification. To verify that the instrument conforms to the
specification given in Chapter 1, refer to Chapter 7, ‘Acceptance testing’.

(1) Ensure that the correct fuse is fitted (accessible from the rear panel) and connect the

instrument to the supply.
(2) Switch on and check that a display is present.
(3) If the instrument appears to be completely dead, carry out the following:
Check that the mains power supply line is providing power to the instrument.
Check that the mains fuses have not blown.

Connecting to supply

The instrument is a Safety Class 1 product and therefore must be earthed. Use the supplied power
cord or an appropriate replacement. Make sure that the instrument is plugged into an outlet socket
with a protective earth contact.

Disconnecting device

The detachable power cord is the instrument’s disconnecting device, but if the instrument is
integrated into a rack or system, an external power switch or circuit breaker may be required.
Whatever the disconnecting device, make sure that you can reach it easily and that it is accessible
at all times.

Ensure that the AC supply is correctly connected to the POWER SUPPLY socket. For supplies in
the range 100–240 V~, the PSU automatically selects the appropriate range. There is no manual
voltage range selection provided.

INSTALLATION

Fuse

For the AC voltage range of 100-240V~ the fuse rating is T4AL250V. The AC fuse is a cartridge
type measuring 20 mm

The fuse-holder is integral with the rear-panel 3-pin supply plug. For access to change the fuse,
use a screwdriver to lever out the holder.

× 5 mm.

General purpose interface bus (GPIB)

The GPIB interface built into the instrument enables the signal generators to be remotely
controlled to form part of an automatic measuring system.

GPIB cable connection

Connection to other equipment which has a 24-way connector to IEEE Standard 488 is made using
the rear-panel GPIB 1 socket. For this purpose, the GPIB cable assembly, available as an optional
accessory, (see Chapter 1, ‘Versions, options and accessories’) may be used. A second socket,
GPIB 2, may be fitted as an option (not yet implemented).

2-5

GPIB connector contact assignments

The contact assignments of the GPIB cable connector are as given in the table below and shown in
Fig. 2-1.

Contact Function Contact Function

INSTALLATION

10
11
12

Fig. 2-1 GPIB connector contact assignments (viewed from rear of instrument)

IEEE to IEC conversion

An optional IEEE to IEC adapter is also available (contact your local distributor) for interfacing
with systems using a 25-way bus connector to IEC Recommendation 625. The method of use is
shown in Fig. 2-2.

1
2
3
4
5
6
7
8
9

Data I/O 1
Data I/O 2
Data I/O 3
Data I/O 4
EOI
DAV
NRFD
NDAC
IFC
SRQ
ATN
Ground shield

12 1

24 13

13
14
15
16
17
18
19
20
21
22
23
24

DataI/O 5
DataI/O 6
DataI/O 7
DataI/O 8
REN
Pair with 6
Pair with 7
Pair with 8
Pair with 9
Pair with 10
Pair with 11
Logic ground

INSTRUMENT
(IEEE
CONNECTOR)

INSTRUMENT
(IEEE
CONNECTOR)

24

IEEE LEAD

25

IEC LEAD

IEEE to IEC
ADAPTER

46883-408

Fig. 2-2 IEEE to IEC conversion

EQUIPMENT

WITH IEEE

CONNECTOR

EQUIPMENT

WITH IEC

CONNECTOR

C4400

2-6

Interface bus connection

The cables for the interface bus use special male-to-female connectors at both ends. This allows
several connectors to be stacked one on top of another, permitting several cables to be connected
to the same source and secured by a lockscrew mechanism. Too large a stack, however, may form
a cantilevered structure which might cause damage and should be avoided. The piggyback
arrangement permits star or linear interconnection between the devices with the restriction that the
total cable length for the system must be:

(1) No greater than 20 m (65 ft).
(2) No greater than 2 m (6 ft) times the total number of devices (including the controller)

connected to the bus.

RS-232 interface

The RS-232 interface built into the instrument is used to reprogram the internal flash memory, and
may also be used to control the instrument using the common GPIB command set.

RS-232 connector

The rear-panel male D-type RS-232 connector is shown in Fig. 2-3.

INSTALLATION

1

6

5

9

Fig. 2-3 RS-232 connector (viewed from rear of instrument)

The pin-outs for the 9-way RS-232 connector are shown below:

Contact Signal

1 DCD Data carrier detect
2 RXD Receive data
3 TXD Transmit data
4 DTR Data terminal ready
5 SG Signal ground
6 DSR Data set ready
7 RTS Request to send
8 CTS Clear to send
9 RI Ring indicator

The RS-232 interface can be connected to a personal computer’s AT connector using a
null-modem cable. A suitable cable is available from IFR − see Chapter 1, ‘Versions, options and
accessories’.

Auxiliary port connector

The rear-panel 25-way female D-type AUXILIARY PORT connector is shown in Fig. 2-4. This is
used for FSK operation.

13

25

1

C0681

14

Fig. 2-4 25-way AUXILIARY PORT connector

2-7

FSK operation

Data for FSK operation is carried on the contacts of the AUXILIARY PORT as shown by
Table 2-1 below. The unused contacts are left unconnected.

INSTALLATION

Table 2-1 Auxiliary port contact assignments

CONTACT FUNCTION

14

15

16

17

18

19

12 0 V

Source A − FSK A

Source A − FSK B

Source B − FSK A

Source B − FSK B

Source C − FSK A

Source C − FSK B

The frequency shifts produced by the applied data are as shown in Table 2-2 below for 2FSK and
in Table 2-3 below for 4FSK.

Table 2-2 Auxiliary port inputs for 2FSK

FSK A FSK B

SOURCE A pin 14 pin 15

SOURCE B pin 16 pin 17 SHIFT

SOURCE C pin 18 pin 19

LOGIC LEVELS 1 *0 +D

0 *0

−D

where D is the set deviation value.
*Tie FSK B as 0 or leave floating.

Table 2-3 Auxiliary port inputs for 4FSK

FSK A FSK B

SOURCE A pin 14 pin 15

SOURCE B pin 16 pin 17 SHIFT

SOURCE C pin 18 pin 19

1 0 +D

LOGIC LEVELS 1 1 +D/3

0 1

0 0

where D is the set deviation value.

−D/3

−D

2-8

INSTALLATION

Rack mounting

The instrument, which is normally supplied for bench mounting, may be mounted in a standard
19-inch rack (see Chapter 1, ‘Versions, options and accessories’). There are two slide
rack-mounting kits to accommodate different depths of cabinet. These kits include full fitting
instructions. A rack-mounting kit without slides is also available which contains front-panel
mounting brackets only.

Routine safety testing and inspection

In the UK the ‘Electricity at Work Regulations’ (1989) section 4(2) places a requirement on the
users of equipment to maintain it in a safe condition. The explanatory notes call for regular
inspections and tests together with a need to keep records.

The following electrical tests and inspection information is provided for guidance purposes and
involves the use of voltages and currents that can cause injury. It is important that these tests are
only performed by competent personnel.

Prior to carrying out any inspection and tests the equipment must be disconnected from the mains
supply and all external signal connections removed. All tests should include the equipment’s own
supply lead, all covers must be fitted and the supply switch must be in the ‘ON’ position.

The recommended inspection and tests fall into three categories and should be carried out in the
following sequence:

1. Visual inspection

2. Earth bonding test

3. Insulation resistance test.

1. Visual inspection

A visual inspection should be carried out on a periodic basis. This interval is dependent on the
operating environment, maintenance and use, and should be assessed in accordance with
guidelines issued by the Health and Safety Executive (HSE). As a guide, this equipment, when
used indoors in a relatively clean environment, would be classified as ‘low risk’ equipment and
hence should be subject to safety inspections on an annual basis. If the use of the equipment is
contrary to the conditions specified, you should review the safety re-test interval.

As a guide, the visual inspection should include the following where appropriate:
Check that the equipment has been installed in accordance with the instructions provided (e.g. that

ventilation is adequate, supply isolators are accessible, supply wiring is adequate and properly
routed).

• The condition of the mains supply lead and supply connector(s).

• The correct rating and type of supply fuses.

• Security and condition of covers and handles.

• Check the presence and condition of all warning labels and markings and supplied safety

information.

• Check the wiring in re-wireable plugs and appliance connectors.

• Check the cleanliness and condition of any ventilation fan filters.

• Check that the mains supply switch isolates the equipment from the supply.

• Check the supply indicator functions (if fitted).

If any defect is noted this should be rectified before proceeding with the following electrical tests.

2. Earth bonding tests

Earth bonding tests should be carried out using a 25 A (12 V maximum open circuit voltage) DC
source. Tests should be limited to a maximum duration of 5 seconds and have a pass limit of

0.1 Ω after allowing for the resistance of the supply lead. Exceeding the test duration can cause
damage to the equipment. The tests should be carried out between the supply earth and exposed

2-9

case metalwork, no attempt should be made to perform the tests on functional earths (e.g. signal
carrying connector shells or screen connections) as this will result in damage to the equipment.

3. Insulation tests

A 500 V DC test should be applied between the protective earth connection and combined live and
neutral supply connections with the equipment supply switch in the ‘on’ position. It is advisable
to make the live/neutral link on the appliance tester or its connector to avoid the possibility of
returning the equipment to the user with the live and neutral poles linked with an ad-hoc strap.
The test voltage should be applied for 5 seconds before taking the measurement.

IFR Ltd employs reinforced insulation in the construction of its products and hence a minimum
pass limit of 7 MΩ should be achieved during this test.

Where a DC power adapter is provided with the equipment, the adapter must pass the 7 MΩ test
limit.

We do not recommend dielectric flash testing during routine safety tests. Most portable appliance
testers use AC for the dielectric strength test which can cause damage to the supply input filter
capacitors.

4. Rectification

It is recommended that the results of the above tests are recorded and checked during each repeat
test. Significant differences between the previous readings and measured values should be
investigated.

If any failure is detected during the above visual inspection or tests, the equipment should be
disabled and the fault should be rectified by an experienced Service Engineer who is familiar with
the hazards involved in carrying out such repairs.

Safety critical components should only be replaced with equivalent parts, using techniques and
procedures recommended by IFR Ltd.

The above information is provided for guidance only. IFR Ltd designs and constructs its products
in accordance with International Safety Standards such that in normal use they represent no hazard
to the operator. IFR Ltd reserves the right to amend the above information in the course of its
continuing commitment to product safety.

INSTALLATION

Cleaning

Before commencing any cleaning, switch off the instrument and disconnect it from the supply.
The exterior surface of the case may be cleaned using a soft cloth moistened in water. Do not use
aerosol or liquid solvent cleaners.

Cleaning the LCD window

To prevent damage to the LCD window, care should be taken not to scratch the surface during use
and also when cleaning. The LCD window should be cleaned by wiping a slightly damp, soft,
lint-free cloth gently over the surface.

Putting into storage

If the instrument is to be put into storage, ensure that the following conditions are not exceeded:

Temperature range: −40 to 70°C
Hu midity: Less than 93% at 40°C

2-10

Introduction

This chapter explains how to:

• Set up the multisource generator to produce a typical basic signal.

• Select the main operating parameters: carrier frequency, output level and type of modulation.

• Use the full range of supporting facilities.

Conventions

The following conventions are used in this chapter:

RF OUTPUT Titles marked on the instrument panel are shown in capital letters

[SETUP] Hard key titles are shown in square brackets.

[Carrier Freq] Soft key titles are shown in italics in square brackets; for example, [Carrier

RF Level Messages appearing on the screen are shown in italics.

Chapter 3

LOCAL OPERATION

Freq] means the soft key adjacent to the Carrier Freq title box at the side of the
menu.

3-1

LOCAL OPERATION

Front-panel controls and connectors

Parameters are selected by means of hard keys (which have their function printed on them), soft
keys (which do not have any notation), a numerical key pad and a rotary control knob; see Fig. 3-1
below. The hard keys have functions which do not change, whereas the soft key functions are
determined by the menu which is being displayed. The numerical keys are used to set parameters

to specific values which can also be varied in steps of any size by using the [
rotary control knob.

ò][ñ] keys or the

KNOB
ON/OFF

131211101943

15

14

9

CDMA interferer MultiSource generator 2026Q

5

SETUP

SIGGEN

6

7

SWEEP

TOTAL

UTIL

MEM

D

7

8

4

5

1

2

0

SET

D

ENTER

GHz

9

sV

MHz

6

ms mV

kHz

3

%Vm

Hz
raddB

KNOB

X10 10

LOCK

8

RF

REVERSEPOWER

ABC

ON/OFF

OUTPUT

50WMAX

RF

50W

PULSE
INPUT

SUPPLY

PULSE

MODI/O MODI/O

INPUT

12 2320 2421 17 26 18 22 25 16

ON/OFF

OUTPUT

RF

RF

50W

REVERSEPOWER

50WMAX

ON/OFF

OUTPUT

RF

RF

50W

OUTPUTTO

RADIOTEST SET

S

COMBINED
RFOUTPUT

50W

ON/OFF

RF

CONNECTION

TORADIO

S

C4289

Fig. 3-1 2026Q front panel

SUPPLY Switches the AC supply voltage on and off.

1

[A], [B] This key is repeated for each signal source. It selects A or B as

2

[SETUP] Displays the Setup Menu used for signal source configuration

3

[SIG GEN] Displays the main, Signal Generator, menu.

4

[SWEEP] Displays the Sweep Control screen for the current source.

5

[UTIL] Displays the Utilities Selection Menu.

6

[MEM] Displays the Memory Store/Recall Menu.

7

[TOTAL ∆]

8

Soft keys Twelve function keys change notation as the menus change.

9

Numerical key pad For entering the value of a selected parameter. Minus sign and

10

[ENTER]/Units keys Determine the units of the set parameters and also used to

11

[KNOB LOCK] Pressing this key assigns control knob operation to the currently

12

the current signal source for parameter display and adjustment.

and for selecting an application mode.

Displays the Total Shift Menu for the current source.

decimal point are included.

terminate a numerical entry.

selected function.

3-2

LOCAL OPERATION

Control knob When enabled by the [KNOB ON/OFF] key, adjusts the value

13

[KNOB ON/OFF] Enables or disables the control knob.

14

[×10]

15

[÷10]

16

[SET ∆]

17

[ñ] Increments the value of the selected parameter.

18

[ò] Decrements the value of the selected parameter.

19

PULSE INPUT

20

MOD I/O

21

of the selected parameter.

When control knob enabled, decreases knob resolution by a
factor of 10.

When control knob enabled, increases knob resolution by a
factor of 10.

Displays the Steps Menu for the current source.

10 kΩ BNC connector (fitted to each signal source) which
accepts a pulsed input.

100 kΩ BNC connector (fitted to each signal source) which
allows an external modulating signal to be applied.
Also provides a modulation oscillator output from a 600 Ω
source impedance.

[Σ]

22

[RF ON/OFF] Enables or disables the associated signal source RF OUTPUT

23

RF OUTPUT

24

CONNECTION

25

TO RADIO

OUTPUT TO

26

RADIO TEST SET

Displays the Combiner Summary.

or the CONNECTION TO RADIO output connector.

50 Ω type-N connector (fitted to each signal source). Protected
against the application of reverse power of up to 50 W.

50 Ω type-N connector for connection to the radio under test.
Note that maximum reverse power at this connector is 0.5 W.

50 Ω type-N connector. Enables a signal to be fed out from the
combiner to the radio test set.

3-3

Rear-panel connectors

The rear-panel connectors are shown in Fig. 3-2 below.

INPUT FROM

RADIO TEST SET

LOCAL OPERATION

1234

TRIGGER 1

EXT STD

INT STD

I/P

TRIGGER 2

POWER SUPPLY

100-240V~

50-60Hz

250VA MAX

FUSE RATING T4AL250V

GPIB 1

RS232

O/P

IEEE 488.2

AUXILIARY PORT

C5818

9

7568

Fig. 3-2 2026Q rear panel

EXT STD I/P BNC connector for the input of an external standard frequency

1

INT STD O/P BNC connector for the output of the internal 10 MHz standard.

2

of either 1 MHz or 10 MHz.

RS232 9-way RS-232 connector used for remote control of the

3

instrument as well as to reprogram the internal flash memory.
For contact allocation see ‘RS-232 connector’ in Chapter 2.

GPIB 1 24-pin socket accepts standard IEEE connector to allow remote

4

POWER SUPPLY 3-pin plug integral with fuse holder. Mates with AC supply

5

TRIGGER 1 BNC connector which is used for sweep triggering.

6

TRIGGER 2 Reserved.

7

AUXILIARY PORT 25-pin socket. Can accept external data to modulate each of the

8

control of the instrument.

lead socket.

internal sources for 2-level or 4-level FSK. For contact
allocation see ‘Auxiliary port connector’ in Chapter 2.

INPUT FROM

9

RADIO TEST SET

50 Ω SMA connector. Enables a signal to be fed into the
combiner from a radio test set or an external signal generator.

3-4

First-time use

First-time users can quickly become familiar with the principles of control and display by carrying out the following
exercise, which demonstrates how to set up on one of the signal sources, a typical basic signal having the following
parameters:

Carrier frequency: 100 MHz
Output level: 10 dBm
Frequency modulation: 100 kHz deviation at 500 Hz mod.

Switching on

Before switching the instrument on, check that the power supply is connected and ensure that no
external signal sources are connected.

Switch on by means of the SUPPLY switch and check that the display is similar to that shown in
Fig. 3-3 below. This shows the Signal Generator menu as it appears during normal operation.

If the default display shown in Fig. 3-3 is not obtained, a previous user may have set the instrument
to switch on with one of the user memories recalled, rather than using the default factory settings.

To reset to the factory settings press the [UTIL] hard key followed by the soft key sequence
[Power Up Options] [Factory Power Up] [EXIT]. Then switch off and switch back on again.

Observe that the Signal Generator menu appears on the display showing the default parameters for
FM, and that the panel for the A signal source is highlighted at the bottom left of the screen. This
indicates that these parameters apply only to the A source.

B3883

Fig. 3-3 2026Q signal generator menu in normal operation showing default display

(with the A source panel highlighted)

3-5

Display

Signal source field

FIRST TIME USE

Before entering any parameters it will be found useful to look at the effect that pressing various
keys has on the display for the Signal Generator menu. This is the main display and it is divided
into a number of fields as shown in Fig. 3-4 below.

This field, at the bottom of the display, is divided into four panels, one each for three signal
sources (the third, C, source is not fitted) and one for the combiner. When a source panel is
highlighted, all the parameters shown on the screen apply to that source; for example, when the A
panel is highlighted, the displayed carrier frequency, RF level, modulation etc., apply only to the A
source. The selected signal source can be changed using the [A] and [B] hard keys.

The RF output from a source may be directed to its own output socket, or re-routed via the
combiner (either alone or in combination with other sources) to the combiner output socket. Signal
sources are combined using a menu accessed via the [SETUP] hard key.

The designation A ð O/P shows that the A source output is directed to the RF OUTPUT socket for
the A source. When A ð
combiner.

Σ

is displayed it shows that the A source output is directed to the

When no signal source is connected to the combiner the combiner panel shows
instrument not fitted is always shown against source designator C.

When one or more sources are connected via the combiner to the CONNECTION TO RADIO
socket, the combiner panel displays this information by showing either

Note that the signal source field is displayed in all modes.

Carrier frequency field

This shows the current carrier frequency setting for the selected signal source. This field is
controlled by the [Carrier Freq] soft key.

When the frequency of the selected source is coupled to another source (so that it tracks it), an
arrow is shown together with the other source’s identity. In Fig. 3-4 for example, the B source is
shown coupled to the A source by the A source panel being highlighted and ðB being shown in the
carrier frequency field.

RF level field

This shows the current RF level setting for the selected signal source. This field is controlled by
the [RF Level] soft key.

When the level of the selected source is coupled to another source, an arrow is shown together with
the other source’s identity (as for frequency coupling).

Frequency standard field

The type of standard is shown in this field together with its frequency. Frequency standard
selection is made from a menu accessed via the [UTIL] hard key.

This field also displays Atten Lock when the attenuator lock function is enabled.

Σ = Α

Σ

not used. In this

or

Σ =

A+B

.

Modulation state field

Here the modulation state is shown as either ENABLED or DISABLED. This is controlled by the
[Mod ON/OFF] key which switches all internal modulation on or off.
When pulse modulation is selected, Pulse ON or OFF is shown (an additional soft key [Pulse
ON/OFF] also appears).

3-6

FIRST TIME USE

Carrier frequency

Frequency standardRF level

Soft
keys

Modulation state

Modulation

Error message

Signal source

Soft
keys

Fig. 3-4 Division of the Signal Generator menu (main display) into fields

C3884

3-7

Modulation field

This field shows all the current modulation settings for the selected signal source: type of
modulation; modulation deviation/depth; modulation frequency; waveform type (shown
graphically); modulation ON or OFF.

FIRST TIME USE

The type of modulation is selected by the [FM], [AM] and [
are shown at any time. This is because the display will already be showing the parameters for the
omitted selection key.

Modulation deviation/depth is selected by the [FM Devn], [AM Depth] and [

Modulation frequency is selected using the [FM Mod Freq], [AM Mod Freq] and [
keys and the value is shown on the screen against ModF:.

The type of waveform (sine, triangle or square) is obtained from a menu after pressing the [Select
Waveform] key. For external modulation this key is replaced by the [Select Coupling] key.

Internal modulation switching is controlled by the [FM ON/OFF], [AM ON/OFF] and [
ON/OFF] keys.

Error message field

Error messages are displayed here when, for example, you exceed a parameter limit. A list of error
messages is given at the end of this chapter.

Soft key fields

These fields can hold up to 12 soft key labels. Some soft keys are used to select a field for data
entry (for example, [Carrier Freq]), in which case the soft key label will remain highlighted after
being pressed to show that any subsequent data entry applies to that function.

Other soft keys may perform an action (for example, turning the modulation on or off), in which
case the label will flash to acknowledge the key-press.

Some soft keys cause another menu to be displayed, in which case there is no highlighting or
flashing of the label, the change of menu acknowledges the key-press.

ϕ

M] keys. Only two of the three keys

ϕ

M Devn] keys.

ϕ

M Mod Freq]

ϕ

M

3-8

FIRST TIME USE

Selecting functions and keyboard entry

Whenever one of the main functions − carrier frequency, RF level, modulation − is highlighted on
the main screen, making any terminated numerical entry will be accepted as being a changed
parameter for that function. This enables you to enter, for example, a sequence of carrier
frequencies without having to re-press the [Carrier Freq] key for each entry.

First of all, select the A source for adjustment by pressing the [A] key.

Carrier frequency

(1) Press the [Carrier Freq] soft key to select carrier frequency as the current function. The key

label is highlighted so that the line bordering the label is increased in thickness to about

1 mm. Data entered on the key pad will now be recognized as a frequency setting and

replaces the current setting.

(2) Enter 100 MHz by entering 100 on the numerical key pad and terminating with [MHz].

Observe that the Carrier Freq: display changes to 100.000 000 MHz.

If you make an error when keying in, press the function key again and key in the correct value. If
this causes an error message (for example, Err 1100: Carrier Limit) to be displayed, it can be
canceled by a correct entry (for example, by entering a value which is within limits).

RF level

(3) Press [RF LEVEL] (which causes its key label to be highlighted) to select RF level as the

current function.

(4) Enter 10 dBm by entering 10 on the numerical key pad and terminating with [dB]. Observe

that the RF Level: display changes to

(5) Press the [RF ON/OFF] key for the A signal source. Repeated pressing toggles between the

on and off states as shown by A ð O/P ON and OFF in the A source panel. Select ON. A

100 MHz, 10 dBm carrier is now being generated from the A source RF OUTPUT socket.

+

10.0 dBm.

Modulation

(6) Press [FM Devn]. Enter 100 on the key pad and terminate with [kHz]. 100 kHz is displayed

(7) Press [FM Mod Freq]. Enter 500 on the key pad and terminate with [Hz]. ModF: 500.00 Hz

(8) Press[Mod ON/OFF]. Repeated pressing toggles between the on and off states as shown by

(9) Press [FM ON/OFF]. Repeated pressing toggles between the on and off states as shown by

in the modulation field.

is displayed .

Modulation ENABLED and DISABLED at the centre of the screen. Select Modulation

ENABLED.

ON and OFF on the screen. Select ON. A 100 MHz, 10 dBm carrier is now being generated

at 100 kHz deviation, sine wave modulated at 500 Hz from the A source RF OUTPUT

socket.

3-9

Parameter adjustment

When a function has been selected, you can increment or decrement its parameter either
continuously using the control knob or in steps using the [ñ] and [ò] keys. You can also
simultaneously adjust two parameters by means of the [KNOB LOCK] key.

Using the control knob

You enable the control knob by pressing the [KNOB ON/OFF] key so that the parameter to be
adjusted is displayed outlined by a bracket. With the control knob enabled, you can set its
resolution. Press the [÷10] key to increase the bracket length by one decimal place. Similarly,
press the [×10] key to decrease the bracket length by one decimal place. In this way you
respectively increase or decrease the resolution of the control knob by a factor of ten.

Disabling the control knob will help to ensure that accidental changes to the set parameters are
prevented.

Two-parameter adjustment

A feature of this instrument is that the [KNOB LOCK] key enables you to simultaneously and
independently adjust two parameters using the control knob and the [ñ] [ò] keys. Proceed as
follows:

(1) Select the function to be assigned to the control knob for adjustment by pressing its soft key,

for example [Carrier Freq]. When selected, the soft key is highlighted so that the line

bordering the key label is increased in thickness to about 1 mm.

(2) Enable the control knob using the [KNOB ON/OFF] key (so that the bracket is visible above

and below the parameter).

(3) Press the [KNOB LOCK] key. Now any movement of the control knob will only adjust the

parameter of the assigned function leaving you free to select a second function (for example

[RF Level]) and adjust its parameter this time using the [ñ] and [ò] keys. At all times the

function locked to the control knob is identified by its parameter being outlined by a bracket

and an inverse-video bracket symbol being displayed at the lower right of the screen.

FIRST TIME USE

3-10

FIRST TIME USE

Using the steps keys

The selected function’s parameter may be adjusted in steps using the [ñ] and [ò] keys to
respectively increment and decrement the parameter. The step size can be set as follows:

(1) Press the [SET ∆] key which causes the Steps Menu to be displayed (see Fig. 3-5 below).

This shows the step sizes of the currently selected signal source.

B3885

Fig. 3-5 Steps menu

(2) Select [Carrier Step], enter the value on the key pad and press a terminator key. The step

value will appear on the screen.

(3) Return to the Signal Generator menu by pressing [SIG GEN].

(4) Using the [ñ] and [ò] keys respectively will now increment or decrement the carrier

frequency by the set value.

(5) [RF Level Step], [ModFreq Step] and [FM Step], [AM Step] and [

ϕ

M Step] values can be

entered in the same way.

(6) Repeat as required for the other signal sources.

3-11

Displaying shifts

You can check the difference between the keyed-in value (the reference) and the current value, as
well as restoring the reference either to the original value or resetting it to the new value. Proceed
as follows:

(1) Press [TOTAL ∆] to display the Total Shift Menu for the selected signal source. This

displays the amount of shift from the reference caused by using the control knob or [ò] [ñ]

keys to adjust the parameters (see Fig. 3-6 below).

FIRST TIME USE

B3886

Fig. 3-6 Total shift menu

(2) Carrier frequency and RF level, as well as modulation depth/deviation and frequency − in

ϕ

combination with the [AM], [FM] and [

appropriate [Shift] key. The amount of shift at each key-press is that of the current step

value.

M] keys − can be further adjusted using the

3-12

Combiner summary

The [Σ] hard key may be used to display a summary of all the sources’ frequencies and levels and
provides an easy means to change these parameters. This menu is also used to implement the
attenuator lock function for each individual source. The function inhibits operation of the step
attenuator from the level at which the key is enabled, and is usable for a level reduction of at least
10 dB.

(1) Press the [Σ] hard key to show the Combiner Summary similar to that shown in Fig. 3-7

below.

FIRST TIME USE

B3887

Fig. 3-7 Combiner summary

(2) You can reset the carrier frequencies and RF levels for each of the sources fitted in your

instrument. Press the [Carrier Freq] or [RF Level] key for the applicable source, enter the

new value on the key pad and press a terminator key.

(3) To display the individual signal source settings press the required [A] or [B] key.

(4) To implement the attenuator lock function, press the [Atten Lock] key for the required A or B

source. Atten Lock is shown on the menu (and also shown on the Signal Generator menu)

against the appropriate source parameters.

3-13

Individual source operation

The following section describes the method of controlling the settings of the individual signal
sources. The method of control can be used irrespective of the routing of the signal source output,
whether to its own RF OUTPUT or to the CONNECTION TO RADIO connector, and irrespective
of any coupling that may have been set up.

Signal source selection

Select the required signal source by pressing the [A] or [B] key. The selection is acknowledged by
the A or B panel at the bottom of the display being highlighted. Having entered the parameters for
that signal source you can then repeat the procedure for the next source. In Fig. 3-8 below the
parameters for the A source are shown.

Fig. 3-8 Signal Generator menu with amplitude modulation selected for the A source

Carrier frequency selection

You can enter the carrier frequency in the range 10 kHz to 2.4 GHz to a resolution of 1 Hz.

(1) Press [SIG GEN] to show the Signal Generator menu with the current carrier frequency

displayed.

(2) Press the [Carrier Freq] soft key to select carrier frequency as the current function.

(3) Enter the required value using the numerical key pad. Terminate using the [Hz], [kHz],

[MHz] or [GHz] key. If a value outside the specified range is requested, an error message is

displayed and the instrument is automatically set to the end of the range.

(4) You can then adjust the frequency either in steps using the [ò],[ñ] keys or by using the

control knob for continuous adjustment. The default increment/decrement is 1 kHz.

(5) You can check the current amount of offset from the reference carrier frequency by pressing

[TOTAL ∆]. This causes the Total Shift Menu to be displayed.

(6) On the Total Shift Menu pressing the [Return Value] key returns you to the reference carrier

frequency; pressing [Transfer Value] selects the currently displayed frequency as the

reference frequency.

(7) Pressing [SIG GEN] returns you to the Signal Generator menu.

B3889

3-14

Carrier on/off

The carrier can be switched on or off at any time by means of the [RF ON/OFF] key. This
effectively switches the output on and off, retaining the 50 Ω

RF level selection

You can enter the RF level in the range −137 to +24 dBm (to +20 dBm above 1.2 GHz).

(1) Press [SIG GEN] to show the Signal Generator menu with the current RF level displayed.

(2) Press the [RF Level] soft key to select RF level as the current function.

(3) Enter the required value using the numerical key pad. For voltage terminate using the [µV],

[mV] or [V] key. For logarithmic units terminate using the [dB] key. RF levels in linear and

logarithmic units are selected from the utilities (see ‘Choice of units’ below). If a value

outside the specified range is requested, an error message is displayed and the instrument is

automatically set to the end of the range.

(4) You can then adjust the level either in steps using the [ò],[ñ] keys or by using the control

knob for continuous adjustment. The default increment/decrement is 1 dB.

(5) You can check the current amount of offset from the reference level by pressing [TOTAL ∆].

This causes the Total Shift Menu to be displayed.

(6) Pressing [Return Value] returns you to the reference level; pressing [Transfer Value] selects

the currently displayed level as the reference level.

(7) Pressing [SIG GEN] returns you to the Signal Generator menu.

INDIVIDUAL SOURCE OPERATION

output impedance.

Choice of units

Units may be µV, mV, V or dB. Conversion between dB and the voltage units is carried out by
pressing the appropriate units key; for example, to change dBm to a voltage unit, press any voltage
key for the correct conversion. The choice of Volts EMF, Volts PD and the dB reference is made
by using the RF Level Units Selection Menu.

3-15

Reverse power protection

Accidental application of power to an individual signal source’s RF OUTPUT socket trips the
reverse power protection circuit (RPP) and a menu similar to that shown in Fig. 3-9 below appears
with a flashing message.

INDIVIDUAL SOURCE OPERATION

B

Fig. 3-9 RPP tripped

RPP B

RPP B

Reset

Reset

B3900

Note that the protection circuit may be activated when a source is set to a high level and its RF
OUTPUT socket has no terminating load.

The protection circuit can be reset by pressing the [RPP Reset] key for the appropriate source after
having either removed the signal to the source or terminated the RF OUTPUT socket. The display
then returns to the menu in use at the time that the RPP was tripped. If [RPP Reset] is pressed
with the signal still applied, the RPP will trip again.

The maximum reverse power at the CONNECTION TO RADIO socket is 0.5 W.

Modulation selection

The carrier from each signal source can be amplitude, frequency or phase modulated from an
internal or external source. Additionally pulse modulation is available from an external source.
The internal modulation oscillator is capable of generating two tones simultaneously in one
modulation channel and has a frequency range of 0.01 Hz to 20 kHz.

Modulation modes

Each signal source has its own independent modulation facilities. The MOD I/O socket on each of
the signal sources allows an external modulation signal to be summed with the signals from the
internal oscillator. This allows up to three modulations to be available from each source; for
example, external FM with a combined internal AM1 and AM2.

Modulation source can be internal or external. If internal, the modulation can be the sum of two
signals (AM1 + AM2, FM1 + FM2 or ϕM1 + ϕM2), each of which can have its own
depth/deviation and modulation frequency.

The common carrier wave can be modulated by two different types of modulation, where one uses
an internal source and the other an external source. The internal source may be composed of two
signals. Allowed combinations are:

internal AM + external FM ; internal FM + external AM
internal AM + external ϕM ; internal ϕM + external AM

Note that pulse modulation may be selected for each signal source in addition to any normal
modulation combination.

3-16

Mode selection

Modulation mode is selected as follows:

(1) Press the [UTIL] hard key to display the Utilities Selection Menu 1 (additionally pressing

[Utils Menu 1] if necessary). Then select [Mod’n Mode] to display the Modulation Mode

Selection Menu. This shows the currently selected modulation mode (see Fig. 3-10 below)

for the selected signal source.

(2) Use the [Up] and [Down] keys to move the selection box over the required modulation

mode. Repeated pressing of the [Down] key will cause the screen to scroll, revealing further

selections.

(3) Press [Select Mode]. The display changes to show your new current modulation mode.

(4) Press [SIG GEN] to display the Signal Generator menu which has been modified to show the

new configuration.

INDIVIDUAL SOURCE OPERATION

Fig. 3-10 Modulation mode selection menu

B3901

Signal Generator screens

Changing the modulation mode by means of the Modulation Mode Selection Menu affects the way
in which the Signal Generator screen is presented as follows:

If a single internal modulation mode (for example, AM internal) has been selected, the [Select
Waveform] key is displayed. This is replaced by the [Select Coupling] key if instead, a single
external modulation mode (for example, FM external) has been selected.

If a dual internal modulation mode (for example, AM1 + AM2 internal) has been selected, the
modulation field is divided vertically into two panels, one for each modulation channel as shown in
Fig. 3-11 below.

B3902

Fig. 3-11 Signal Generator menu with two internal modulation channels

3-17

INDIVIDUAL SOURCE OPERATION

If a dual mixed modulation mode (for example, AM1 internal & FM external) has been selected,
the modulation field is divided horizontally into two panels, one for each modulation source as
shown in Fig. 3-12 below.

B3903

Fig. 3-12 Signal Generator menu with internal and external modulation sources

3-18

INDIVIDUAL SOURCE OPERATION

Internal waveform selection

Having selected an internal modulation mode, you can select the type of waveform as follows:

(1) Press [SIG GEN] to show the Signal Generator menu.

(2) Press [Select Waveform] to display the Internal Source Waveform Menu. This shows the

currently selected modulation and waveform (see Fig. 3-13 below).

B3904

(3) Select between [Sine Wave], [Triangle Wave] and [Square Wave]. The waveform on the

screen changes to show your new waveform selection.

(4) Press [EXIT] to return to the Signal Generator menu.

Modulation source adjustment

You can adjust the phase difference of modulation oscillator Channel 2 relative to Channel 1 in
degrees as follows:

(5) Press the [Mod Src Phase] key to display the Modulation Source Phase Adjustment menu

shown in Fig. 3-14 below. This shows the currently selected phase difference setting for the

selected signal source.

Fig. 3-13 Internal source waveform menu

B3905

Fig. 3-14 Modulation source phase adjustment menu

(6) Select the required adjustment control by pressing [Knob Fine], [Knob Medium] or [Knob

Coarse]. These provide adjustments in steps of 0.1°, 1.0° and 3.0° respectively.

3-19

INDIVIDUAL SOURCE OPERATION

(7) Press [Phase Diff] and adjust the phase using the control knob. Turn clockwise to advance

the phase and anticlockwise to retard the phase. Note that if you have set the source phase

and subsequently adjusted the source frequency or changed the waveform, the menu Phase

Difference: value will be blanked. This is because the value will then be indeterminate due to

the adjustment or changed waveform.

(8) To establish a reference, the displayed phase shift can be reset to 0.0° by pressing [Reset

Phase].

(9) Press [EXIT] to return to the Signal Generator menu.

External source coupling

Having selected an external modulation mode, you can select the type of external coupling as
follows:

(1) Press [SIG GEN] and show the Signal Generator menu for a single modulation mode.

(2) Press [Select Coupling] to display the External Source Coupling Menu. This shows the

currently selected modulation and external coupling (see Fig. 3-15 below).

Fig. 3-15 External source coupling menu (the [DCFM Nulling] key only appears during FM

external modulation mode with DC coupling)

(3) Select between [Ext AC Coupling], [Ext ALC Coupling] and [Ext DC Coupling]. The screen

changes to show your new coupling selection.

(4) Apply a signal to the MOD I/O socket.

(5) When Automatic Leveling Control is selected by pressing [Ext ALC Coupling], and the error

message Err 511: ALC too high or Err:512: ALC too low is displayed, the level must be

adjusted. Adjust the signal level until it is within the 0.75 to 1.25 V RMS ALC range of the

source.

(6) Press [EXIT] to return to the Signal Generator menu.

DCFM nulling

For a DC-coupled external signal, small frequency offsets can be reduced by using the DCFM
nulling facility. Operation is as follows:

(1) With FM External mode previously selected from the Modulation Mode Selection Menu

press the [Ext DC Coupling] key shown in Fig. 3-15 above.

(2) Connect your ground reference to the MOD I/O socket.

(3) Press the [DCFM Nulling] key which is now displayed. * DCFM Nulling * appears during

the nulling process and when it disappears the process is completed.

B3906

3-20

INDIVIDUAL SOURCE OPERATION

Modulation ON/OFF

[Mod ON/OFF] switches all modulation ON or OFF and the condition is indicated in the centre of
the Signal Generator menu:

Modulation is also controlled by the individual modulation ON/OFF keys. For modulation to
appear on the carrier, modulation must be both enabled with the [Mod ON/OFF] key and the
individual [AM ON/OFF], [FM ON/OFF], [
individual modulation ON/OFF keys only reduce the modulation to zero, whereas the [Mod
ON/OFF] key completely disables the modulation system so that the instrument reverts to a carrier
frequency generator.

Amplitude modulation selection

Select amplitude modulation as follows:

(1) Press [SIG GEN] to show the Signal Generator menu with the current modulation displayed

in the bottom half of the screen.

(2) Press the [AM] soft key if displayed (otherwise the instrument is already in the AM mode).

(3) Press[AM Depth]. Enter the modulation depth using the numerical key pad and terminate

with any [ENTER] key. If you exceed the 99.9% modulation limit it is automatically reset to

the maximum allowed value.

(4) If the internal modulation is to be the sum of two internal signals, select AM1 + AM2 internal

from the utilities (see ‘Mode selection’ on page 3-17). A typical display is shown in Fig. 3-16

below. Press the [AM2] key to select the second signal. Press the [AM2 Depth] key and

enter the required modulation depth for the second signal. If you exceed the (99.9% − AM1)

modulation depth limit, it is automatically reset to the maximum allowed value.

Modulation DISABLED

ϕ

M ON/OFF] and [Pulse ON/OFF] keys. The

B3907

Fig. 3-16 Signal Generator menu with two modulation channels

(5) Select [AM Mod Freq], enter the modulation frequency and terminate with the [Hz] or [kHz]

key. If you exceed the 20 kHz modulation limit it is automatically reset to the maximum

allowed value.

(6) If required, change the waveform from that shown on the display (see ‘Internal waveform

selection’ on page 3-19).

(7) Press [AM ON/OFF] to toggle between the on and off states as shown by the display.

3-21

INDIVIDUAL SOURCE OPERATION

Frequency modulation selection

Select frequency modulation as follows:

(1) Press [SIG GEN] to show the Signal Generator menu with the current modulation displayed

in the bottom half of the screen.

(2) Press the [FM] soft key if displayed (otherwise the instrument is already in the FM mode).

(3) Press [FM Devn]. Enter the deviation using the numerical key pad and terminate with the

[Hz] or [kHz] key. If you exceed the 100 kHz deviation limit it is automatically reset to the

maximum allowed value.

(4) If the internal modulation is to be the sum of two signals, select FM1 + FM2 internal from

the utilities (see ‘Mode selection’ on page 3-17). A typical display is shown in Fig. 3-16

above. Press the [FM2] key to select the second signal. Press the [FM2 Depth] key and

enter the required deviation for the second signal. If you exceed the (100 kHz − FM1)

deviation limit, it is automatically reset to the maximum allowed value.

(5) Select [FM Mod Freq], enter the modulation frequency and terminate with the [Hz] or [kHz]

key. If you exceed the 20 kHz modulation limit it is automatically reset to the maximum

allowed value.

(6) If required, change the waveform from that shown on the display (see ‘Internal waveform

selection’ on page 3-19).

(7) Press [FM ON/OFF] to toggle between the on and off states as shown by the display.

Phase modulation selection

Select phase modulation as follows:

(1) Press [SIG GEN] to show the Signal Generator menu with the current modulation displayed

in the bottom half of the screen.

ϕ

(2) Press the [

(3) Press [

[rad] key. If you exceed the 10 rad deviation limit it is automatically reset to the maximum

allowed value.

(4) If the internal modulation is to be the sum of two signals, select ϕM1 + ϕM2 internal from

the utilities (see ‘Mode selection’ on page 3-17). A typical display is shown in Fig. 3-16

above. Press the [

enter the required deviation for the second signal. If you exceed the (10 rad − ϕM1)

deviation limit, it is automatically reset to the maximum allowed value.

(5) Select [

key. If you exceed the 20 kHz modulation limit it is automatically reset to the maximum

allowed value.

(6) If required, change the waveform from that shown on the display (see ‘Internal waveform

selection’ on page 3-19).

(7) Press [

M] soft key if displayed (otherwise the instrument is already in the ϕM mode).

ϕ

M Devn]. Enter the deviation using the numerical key pad and terminate with the

ϕ

M2] key to select the second signal. Press the [ϕM2 Depth] key and

ϕ

M Mod Freq], enter the modulation frequency and terminate with the [Hz] or [kHz]

ϕ

M ON/OFF] to toggle between the on and off states as shown by the display.

Pulse modulation selection

Pulse modulation may be selected in addition to any other normal modulation modes. The source
is external from any of the PULSE INPUT sockets. Select pulse modulation as follows:

(1) Press [UTIL] to display the Utilities Selection Menu 1. If the Utilities Selection Menu 2 is

displayed, it will be necessary to press the [Utils Menu 1] key.

(2) Select [Mod’n Mode] to display the Modulation Mode Selection Menu.

(3) Press the [Pulse Enab/Dis] key to toggle between the ON and OFF states until the display

shows Pulse Mod’n: ENABLED.

(4) Press [SIG GEN] to return to the Signal Generator menu.

3-22

(5) Press [Pulse ON/OFF] to toggle between the ON and OFF states until the display shows

FSK selection

The instrument accepts logic level inputs to the AUXILIARY PORT connector to produce an FSK
modulated output signal from each source. The input data is sampled at 100 kHz and produces a
2- or 4-level shift waveform which is filtered by a 20 kHz Bessel filter and applied to the carrier.
Frequency shift keying is selected as follows:

(1) Press [UTIL] to display the Utilities Selection Menu 1. If the Utilities Selection Menu 2 is

(2) Select [Mod’n Mode] to display the Modulation Mode Selection Menu.

(3) Use the [Up] and [Down] keys to move the selection box over the required 2FSK or 4FSK

(4) Press [Select Mode]. The display changes to show your new current modulation mode.

(5) Press [SIG GEN] to display the Signal Generator menu. This has been modified to show

INDIVIDUAL SOURCE OPERATION

Pulse ON.

When ON the carrier is controlled by the logic level applied to the PULSE INPUT socket. A

logical ‘1’ (a voltage between 3.5 and 5 V) allows carrier output, a logical ‘0’ (a voltage

between 0 and 1.0 V) suppresses it. Turning pulse mod OFF effectively applies a logical ‘1’

allowing carrier output.

displayed, it will be necessary to press the [Utils Menu 1] key.

modulation mode.

either 2 level FSK − Ext source or 4 level FSK

−

Ext source in the modulation field (see

Fig. 3-17 below).

B3908

Fig. 3-17 Signal Generator menu with 4FSK selected

(6) Press [FM Devn], enter the required deviation and terminate with the [Hz] or [kHz] key. If

you exceed the 100 kHz deviation limit the entered value is automatically reset to the

maximum allowed value.

(7) If FSK is turned off (either locally with [FM ON/OFF] or globally with [Mod ON/OFF]) no

frequency shift is applied to the carrier.

For information on the use of the AUXILIARY PORT connector for FSK operation see Chapter 2,
‘Auxiliary port connector’ and ‘FSK operation’.

3-23

The sweep capability allows the comprehensive testing of systems, since measurements at single
points will not necessarily give an overall indication of the performance. The sweep function is
specified by the following parameters:

• Start frequency

• Stop frequency

• Size of step

• Time per step

The sweep can be operated in single shot or continuous modes with the start command triggered by
a key press, an external pulse or GPIB control. Once started, the sweep can be stopped at any time
when the display will indicate the current parameter value.

Sweep operation

(1) Press the [SWEEP] key, which causes the Sweep Control screen to be displayed. In fixed,

non-sweep, mode the screen is similar to that shown in Fig. 3-18 below. In sweep mode the
screen changes similar to that shown in Fig. 3-20.

Sweep

B3909

Fig. 3-18 Sweep control screen in fixed mode

(2) Press [Sweep Mode] to display the Carrier Sweep Mode menu shown in Fig. 3-19 below.

B3910

Fig. 3-19 Carrier sweep mode menu

3-24

SWEEP

(3) Select the A or B source for sweeping by pressing the appropriate [A Swept Source] or

[B Swept Source] key.

(4) Select the sweep mode between single shot and continuous sweeping by pressing the [Sweep]

key which toggles between [Single Sweep] and [Cont Sweep].

(5) For external triggering press [Ext Trig Off] to inhibit the external trigger or press one of the

following keys to select the appropriate trigger mode:

[Ext Trig Start] − The first trigger input causes the carrier sweep to commence sweeping.

Any other trigger inputs whilst sweeping are ignored. Only at the end of each sweep is
the trigger latch reset ready for the next input.

[Ext Trig StrtStop] − The first trigger input starts the carrier sweep and the following trigger

input pauses it, so that the user can investigate a particular point of interest. The next
trigger input continues the sweep from where it was paused. At the start of each sweep
the trigger latch is reset ready for the next input.

[Ext Trig Step] − Each trigger input steps the sweep on by one frequency step. The trigger

latch is reset after each step ready for the next step.

(6) Pressing [No Swept Source] disables sweep mode.

(7) If no source has been selected for sweeping, pressing [EXIT] will return you to the Carrier

Sweep Mode Menu. Otherwise, the Sweep Control screen will be displayed.

3-25

Sweep control

SWEEP

(8) The Sweep Control screen displayed is similar to that shown in Fig. 3-20 below. This is used

to perform the sweeping operation.

B3911

Fig. 3-20 Sweep control screen in sweep mode (with the B source coupled to the A source)

(9) Enter the sweep start and stop frequencies using the [Start Freq] and [Stop Freq] keys.

(10) Press [Step Size] and enter the step size in the range 1 Hz to the instrument maximum

frequency, to a resolution of 1 Hz.

(11) Press [Step Time] and enter the step time in the range 50 ms to 10 s to a resolution of 1 ms.

(12) To start the sweep press [Start Sweep]. The key changes its function to [Stop Sweep] and

Sweep Status changes from WAITING FOR TRIGGER to SWEEPING. The displayed Sweep
Freq changes to show the progress of the sweep.

(13) The sweep can be stopped at any time by pressing [Stop Sweep]. This causes the key

function to change to [Continue Sweep] and Sweep Status changes to PAUSED.

(14) Whilst the sweep is paused you can adjust the frequency by selecting [Sweep Freq], then

using the control knob to look at a particular frequency of interest. Pressing [Transfer]
followed by [Continue Sweep] causes the sweep to continue from your adjusted frequency.
Otherwise simply pressing [Continue Sweep] restarts the sweep from where it was paused.
Pressing [Reset Sweep] discontinues the sweep and resets it to the start frequency.

(15) At the end of a single sweep, the stop frequency is shown and the key function changes to

[Start Sweep] with SWEEP COMPLETE displayed. For continuous sweep, the sweep
automatically recommences from the start frequency.

(16) To change the sweep mode, press the [Sweep Mode] key which returns you to the Carrier

Sweep Mode menu.

3-26

Utility menu selection

Pressing the [UTIL] key gains access to the utilities options from two primary menus, Utilities
Selection Menu 1 and Utilities Selection Menu 2. When a selection is made from either of these

menus and then [UTIL] is pressed, the primary menu is re-displayed. However, if a selection is
made and then one of the other hard keys (for example, [MEM]) is pressed, pressing [UTIL] once
returns to the sub-menu, pressing it again returns to the primary menu. This provides an operating
short-cut in that it allows you to re-access a sub-menu without first having to go through the
primary menu again.

Selection menu 1

Utilities

The display for Utilities Selection Menu 1 is shown in Fig. 3-21 below.

Fig. 3-21 Utilities selection menu 1

To obtain Utilities Selection Menu 2 from the menu, select [Utils Menu 2].

B3912

3-27

Display adjustment (menu 1)

You can set the display contrast and brightness to suit your individual preferences using this utility.
The setting can then be saved for automatic recall whenever the instrument is switched on.
Proceed as follows:

(1) Select [Display Adjust] to call up the Display Adjustment Utility shown in Fig. 3-22 below.

UTILITIES

B3913

Fig. 3-22 Display adjustment utility

(2) Set the required brightness by pressing [Dim], [Medium] or [Bright]. You can then adjust

the contrast by means of the control knob.

(3) Once adjusted, the display setting can be stored in the non-volatile memory by pressing [Save

LCD Setting]. The setting will be subsequently recalled on power-up.

(4) Press [EXIT] to return to the Utilities Selection Menu 1.

3-28

UTILITIES

Frequency standard selection (menu 1)

This utility enables you to select a 10 MHz output as a standard for use with associated equipment.
It also enables you to select a standard (either external or internal) for use by the instrument. When
an external standard is selected, the internal TCXO is locked to the external standard using a phase
locked loop. For a 10 MHz standard, the menu allows you to select between direct and indirect.
When direct is selected the internal standard for the RF trays is provided directly from the external
standard. When indirect is selected this standard is provided from the TCXO locked to the
external standard. Frequency standard selection is as follows:

(1) Select [Freq Standard] to display the Frequency Standard Selection Menu shown in

Fig. 3-23 below. This shows the currently selected standard.

B3914

Fig. 3-23 Frequency standard selection menu

(2) Select the internal standard for the instrument by pressing [10 MHz Int].

(3) To provide an externally generated 1 or 10 MHz standard for the instrument, connect the

signal to the rear panel EXT STD I/P socket. Then choose one of the three external standards

[10 MHz Ext Dir], [1 MHz Ext Ind] or [10 MHz Ext Ind]. You should choose [10 MHz Ext
Dir] if your provided 10 MHz standard is better than that fitted in the instrument.

(4) To obtain an internally generated 10 MHz standard from the instrument’s INT STD O/P

socket, select [10 MHz Int Out].

(5) Press [EXIT] to return to the Utilities Selection Menu 1.

3-29

UTILITIES

Carrier phase adjustment (menu 1)

You can adjust the phase offset of the carrier with respect to its current phase in degrees as follows:

(1) Press [Carrier Phase] to display the Carrier Phase Adjustment Utility shown in Fig. 3-24

below. This shows the currently selected phase offset for the selected signal source.

Fig. 3-24 Carrier phase adjustment utility

B3915

(2) Select the required adjustment control by pressing [Knob Fine], [Knob Medium] or [Knob

Coarse]. These provide adjustments in steps of 0.09°, 0.9° and 2.7° respectively.

(3) Press [Phase Shift] and adjust the carrier phase using the control knob. Turn clockwise to

advance the phase and anticlockwise to retard the phase. Note that if you have set the carrier
phase and subsequently adjusted the carrier frequency, the menu Phase Shift: value will be
blanked. This is because the value will then be indeterminate due to the adjustment.

(4) To establish a reference the displayed phase shift can be reset to 0.00° by pressing [Reset

Shift]. But note that this does not reset the actual phase shift, only the displayed value is reset
to provide a new reference.

(5) Press [EXIT] to return to the Utilities Selection Menu 1.

3-30

UTILITIES

RF level units selection (menu 1)

RF output level units may be changed as follows:

(1) Press [RF Level Units] to display the RF Level Units Selection Menu which shows the current

selection (see Fig. 3-25 below).

Fig. 3-25 RF level units selection menu

(2) Select between linear and logarithmic units in EMF or PD. Logarithmic units may be referred

to volts (dBV), millivolts (dBmV), microvolts (dBµV) or to 1 millivolt into 50 Ω (dBm).

(3) Press [EXIT] to return to the Utilities Selection Menu 1.

B3916

3-31

UTILITIES

50 ΩΩΩΩ /75 ΩΩΩΩ impedance selection (menu 1)

The performance specification of each signal source assumes operation into 50 Ω loads. By means
of this menu in association with a 75 Ω adapter (see data sheet in Chapter 1) you can select
operation into 75 Ω loads whilst maintaining correct voltage calibration. It also enables the reverse
power protection circuit to function correctly. But note that in the event of an overload the RPP
will function but the adapter will NOT be protected. Proceed as follows:

(1) Press [50

below.

(2) Press [50

shown by the screen. Note that all RF OUTPUT sockets, including the combiner’s
CONNECTION TO RADIO, will change calibration.

(3) For 75 Ω operation connect a 50 Ω/75 Ω adapter to the front panel RF OUTPUT socket for

each appropriate signal source. Whenever the impedance is changed, the value of the
displayed level is adjusted (by 5.7 dB) to the level at the output from the adapter.

(4) Press [EXIT] to return to the Utilities Selection Menu 1.

Ω/75Ω

Ω/75Ω

Cal] to display the 50 Ohm/75 Ohm Calibration Menu shown in Fig. 3-26

B3917

Fig. 3-26 50 ohm/75 ohm calibration menu

Cal] which toggles between 50 Ohm Calibration and 75 Ohm Calibration as

3-32

Power-up options (menu 1)

The instrument can power-up in one of two states; with the factory settings or with the settings of
your choice stored in one of the full memory locations. Selection is made as follows:

(1) Press [Power Up Options] to display the Power Up Options Menu shown in Fig. 3-27 below.

This shows the currently selected power-up choice.

UTILITIES

B3918

Fig. 3-27 Power up options menu

(2) Press [Factory Power Up] to select the factory power-up settings (these are listed in

Table 3-1 below). Otherwise press [Memory Power Up] to store the current settings as your
selected power-up state.

(3) Press [EXIT] to return to the Utilities Selection Menu 1.

3-33

Default settings

The instrument is reset to the factory default settings in the following cases:

(1) At power-up to factory default settings.

(2) Following execution of the *RST command.

(3) When [Factory Recall] is pressed on the Memory Recall Menu.

The default settings are shown in Table 3-1.

Source selected Source A

Carrier frequency :
Step :

RF level
Step :

Modulation mode Internal FM, modulation disabled

Modulations : FM1 : Deviation: 0 Hz, OFF

FM2 : Deviation: 0 Hz, OFF

AM1 : Deviation: 0%, OFF

AM2 : Deviation: 0%, OFF

Pulse : OFF

Modulation steps :

Mod frequency steps : 10 Hz

Carrier sweep
Freq mode :
Mode :
Ext trigger :
Start :
Stop :
Step size :
Time :

UTILITIES

Table 3-1 Instrument default settings

(Maximum available) 2.4 GHz
1 kHz

−137 dBm
1 dB Status: ON

: Internal source, frequency: 1 kHz, sine

: Internal source, frequency: 400 Hz, sine

ΦM1 : Deviation: 0 rad, OFF
: Internal source, frequency: 1 kHz, sine

ΦM2 : Deviation: 0 rad, OFF
: Internal source, frequency: 400 Hz, sine

: Internal source, frequency: 1 kHz, sine

: Internal source, frequency: 400 Hz, sine

:

∆FM 1 kHz, ∆ΦM 0.1 rad, ∆AM 1%

Fixed
Single sweep
Off
10 kHz
(Maximum available)
1 kHz
50 ms

3-34

UTILITIES

Modulation mode selection (menu 1)

Modulation mode is selected by pressing [Mod’n Mode] to display the Modulation Mode Selection
Menu shown in Fig. 3-28 below. Use of the menu is explained earlier under ‘Modulation mode

selection’.

Fig. 3-28 Modulation mode selection menu

B3919

3-35

UTILITIES

Remote control selection (menu 1)

The remote mode of operation is selected as follows:

(1) Select [Remote Control] to display the Remote Control Utility. This shows the currently

selected remote mode (see Fig. 3-29 below).

Fig. 3-29 Remote control utility

B3920

(2) Press [GPIB/RS232] to toggle between GPIB and RS232.

GPIB mode

(3) Press [GPIB Address] and enter the address, which must be unique on the system to the

instrument and within the range 0 to 30.

RS-232 mode

(3) Press [Data Bits] to toggle between 7 and 8 data bits.

(4) Press [Stop Bits] to toggle between 1 and 2 stop bits.

(5) Press [Parity] to cycle through the selections None, Odd, Even.

(6) Press [Hardware Hndshk] and [XON/XOFF Hndshk] to select any combination between both

OFF to both ON.

(7) Press [Baud Rate] and set the baud rate in the range 300 to 9600 bit/s. But note that if the

entered value is not one of the following standard settings, the next higher value will be
selected by default.

300
600
1200
2400
4800
9600

(8) Press [EXIT] to return to the Utilities Selection Menu 1.

3-36

UTILITIES

Background error reporting (menu 1)

Background errors are generated due to an incorrect operating condition within the instrument.
These error messages are generated automatically to warn the operator. Although there is only
room to display one message in the error message field of the displays, this utility enables a
complete list of the current background errors to be shown. Proceed as follows:

(1) Press [Backg’nd Errors] which causes the Current Background Errors display similar to that

in Fig. 3-30 below to be shown. The errors are shown in priority order.

B3921

Fig. 3-30 Current background errors display (showing example errors)

(2) Where there are more background errors than can be displayed on one screen page, the [Next

Page] and [Previous Page] soft keys will be displayed to enable more than one page of

errors to be viewed.

(3) Press [EXIT] to return to the Utilities Selection Menu 1.

3-37

UTILITIES

Protection locking and unlocking (menu 1)

To prevent accidental interference with the contents of internal memories, internal data is protected
by secure key sequences. There are two levels of protection. The most secure, Level 2, is used for
memory erasure, elapsed time reporting and for servicing purposes such as altering the calibration
data of the instrument. Level 1 protection is used for display blanking and memory protection.

The lock and unlock utility is selected as follows:

(1) Select [Lock & Unlock] to display the Lock & Unlock Utility. When Level 1 and Level 2 are

both locked the display will be similar to Fig. 3-31 below.

B3922

Fig. 3-31 Lock and unlock utility (during password entry)

(2) To unlock to Level 1 press [Unlock Level 1] and enter a 4-digit password (the default is

1234). As each digit is entered an asterisk is displayed. Terminate with [ENTER].

(3) To unlock to Level 2 press [Unlock Level 2] and enter a 6-digit password (the default is

123456). As each digit is entered an asterisk is displayed. Terminate with [ENTER].

(4) When successful, UNLOCKED is displayed on the screen against the appropriate level and

the [Unlock Level 1] or [Unlock Level 2] key is blanked. If the entered password is not
recognized by the instrument the password will have been changed by operating personnel.

(5) To lock the instrument, press the appropriate [Lock Level 1] or [Lock Level 2] key.

(6) Press [EXIT] to return to the Utilities Selection Menu 1.

If you have lost or forgotten the password, contact Customer Services or your nearest agent
(for addresses see inside rear cover). You will be required to give the instrument’s serial
number.

3-38

Selection menu 2

Press the [Utils Menu 2] on the Utilities Selection Menu 1 to obtain the display for Utilities
Selection Menu 2 as shown in Fig. 3-32 below. Some of the items on this menu are intended for

use in servicing and are described in the maintenance manual.

Fig. 3-32 Utilities selection menu 2 (some of these keys only appear when unlocked

UTILITIES

to the appropriate Level)

B3923

To obtain Utilities Selection Menu 1 from the menu, select [Utils Menu 1].

Software information (menu 2)

You can obtain a description of the instrument’s software by pressing [Software Status] which
causes Fig. 3-33 below to be displayed. This shows the software version and date as well the
EPROM part number.

Fig. 3-33 Software status display

B3924

(1) Press [EXIT] to return to the Utilities Selection Menu 2.

3-39

Hardware information (menu 2)

You can obtain a description of the instrument’s hardware by pressing [Hardware Status] which
causes Fig. 3-34 below to be displayed. This shows the instrument type and serial number as well
as options fitted.

Fig. 3-34 Hardware status display

UTILITIES

B3925

(1) Press [EXIT] to return to the Utilities Selection Menu 2.

Patent information (menu 2)

To obtain the more important patent information, press [Patent Info] which causes Fig. 3-35 below
to be displayed.

(1) For a full list of patents refer to ‘Patent protection’ in the Preface.

(2) Press [EXIT] to return to the Utilities Selection Menu 2.

Fig. 3-35 Patent information display

B3926

3-40

Display blanking (menu 2)

This facility is used to prevent sensitive data from being displayed. It allows various parts of the
display to be replaced by a series of dashes so that values entered by the user or recalled from the
memory will not be visible.

UTILITIES

Fig. 3-36 Display blanking utility

B3927

(1) Unlock the protection to Level 1 by means of the Lock & Unlock Utility (Menu 1).

(2) Press [Display Blanking] which causes the screen shown in Fig. 3-36 above to be displayed.

(3) To blank the screen press the [Blanking ON/OFF] key which toggles between the on and off

states.

(4) Press the [SIG GEN] key to display the main screen. Here it can be seen that the main

parameters are blanked and replaced by dashes. This also applies to the parameters displayed
on the Sweep Control screen.

(5) Press [EXIT] to return to the Utilities Selection Menu 2.

3-41

Latch access utility (menu 2)

This utility is intended for use as a diagnostic aid by allowing data to be sent to latches within the
instrument. For further information consult the maintenance manual. The menu is shown in
Fig. 3-37 below.

UTILITIES

Fig. 3-37 Latch access utility

B3928

Elapsed time (menu 2)

The elapsed time facility displays the total number of operating hours as well as the number of
elapsed operating hours since the last reset by the [Reset Elapsed] key. This facility can be used to
assess the instrument’s operational reliability and utilization. To use this facility the instrument
must be unlocked to Level 2. The screen is shown in Fig. 3-38 below.

Fig. 3-38 Elapsed time utility

B3929

3-42

RPP trip count utility (menu 2)

This utility lists the number of times each of the fitted sources has tripped. The screen is shown in
Fig. 3-39 below.

UTILITIES

Fig. 3-39 RPP trip count utility

B3930

Display test utility (menu 2)

This utility provides a simple test of the display. The screen is shown in Fig. 3-40 below.

Fig. 3-40 Display test utility

B3931

3-43

Key/knob tests (menu 2)

In this utility the user is invited to operate the keys and control knob whilst checking the reaction of
the instrument. The screen is shown in Fig. 3-41 below.

UTILITIES

Fig. 3-41 Keyboard/knob test utility

B3528

Calibration utility (menu 2)

This menu shows when each individual item was last adjusted and enables you to enter the date of
the current adjustment. The instrument must be unlocked to Level 2 to use this utility. Full details
regarding calibration can be found in the maintenance manual. The first page of the menu is shown
in Fig. 3-42 below.

Fig. 3-42 Calibration menu

B3932

3-44

Memory stores

There are three types of store: carrier, full and RAM. Both carrier and full stores are non-volatile.
The contents of the RAM store are lost when the instrument is switched off.

Each type of store holds the data for all fitted sources.

Carrier store

The non-volatile carrier frequency store has 100 locations numbered 0 to 99 for the storage of
carrier frequency only. This store can be used to apply a set of test conditions to a range of
frequencies. For example, if you wish to use the same modulation at a variety of frequencies you
can use the carrier store to set the instrument to each of the frequencies in turn. When a carrier
store is used it will only replace the current carrier frequency − all the other settings will remain
unchanged.

Memory

Full store

The non-volatile full store has 100 locations numbered 0 to 99 for the storage of instrument
settings. This store is used to store those parameters which currently affect the RF output; carrier
frequency, RF level, modulations in use, on/off and source information and the two modulation
oscillator frequencies in use.

A full store contains the following information:

Carrier frequency setting
Carrier frequency step size
RF level setting
RF level step size
All modulation settings
All modulation step sizes
Modulation mode and status
The active modulation frequencies
The modulation frequency step size
All sweep settings

RAM store

The volatile RAM store has locations numbered from 0 to 99 for the full storage of instrument
settings. The parameters stored are the same as those for the full store. However, the RAM store
has no long-term wear-out mechanism and is therefore recommended for use in ATE programs
where all the settings to be used in a test sequence are initially declared and then recalled. This
results in a reduction of the GPIB/RS-232 overhead.

3-45

Storing data

Select the memory store function as follows:

(1) Press the [MEM] hard key and then, if necessary, press the [Store/Recall] soft key to display

MEMORY

the Memory Store Menu shown in Fig. 3-43 below.

Fig. 3-43 Memory store menu

B3933

(2) To store data, press the [Full Store], [Carrier Store] or [RAM Store] key for the type of store

required, then enter the store location via the numerical key pad and terminate with [ENTER].

Note that memory erasure requires unlocking to Level 2 (see ‘Protection locking and unlocking’ on
page 3-37).

Memory protection

Memory stores may be protected against accidental overwriting of the contents.

Memory protection summary

(1) To see which store locations are protected (or unprotected), press the [Memory Protect] key.

If the instrument is in the protection locked state, the Memory Write Protection Summary

shown in Fig. 3-44 below is displayed. Otherwise Fig. 3-45 below is shown.

B3934

Fig. 3-44 Memory write protection summary

(2) From the summary, select the type of memory stores to be displayed by selecting between

[Full Stores], [Carrier Stores] and [RAM Stores]. An unprotected store is indicated by a

dash (−), a protected store is indicated by the letter p.

(3) Press [EXIT] to return to the Memory Store Menu.

3-46

Memory protection menu

(4) To change the write protection, the instrument must be unlocked to Level 1 (see ‘Protection

locking and unlocking’ on page 3-37). Subsequently pressing [Memory Protect] causes the

Memory Write Protection Menu similar to that shown in Fig. 3-45 below to be displayed.

MEMORY

Fig. 3-45 Memory write protection menu

B3935

(5) Select the type of memory stores to be changed by selecting between [Full Stores], [Carrier

(6) To change the protection for a memory block enter the [Block Start] and [Block Stop]

(7) Select [Protect] or [Unprot.] as required. This action is acknowledged by the message

(8) Press [EXIT] to return to the Memory Store Menu.

Note that at power-on the volatile RAM stores are unprotected to allow immediate use.

Memory recall

There are three types of recall: carrier, full and RAM. Both carrier and full stores are non-volatile.
The contents of the RAM store are lost when the instrument is switched off.

Carrier recall

The non-volatile carrier frequency store has 100 locations numbered 0 to 99 for carrier frequency
only. These can be recalled and used in conjunction with full recall to apply a set of test conditions
to a range of frequencies.

Full recall

The non-volatile store has 100 locations numbered 0 to 99 for the storage of instrument settings.
These stores may be recalled and used to reset the instrument’s parameters to those which affect
the RF output: carrier frequency, RF level, modulations in use, on/off and source information and
the two modulation oscillator frequencies in use.

Stores] and [RAM Stores]. An unprotected store is indicated by a dash (−), a protected store

is indicated by the letter p.

numbers. For a single store make both numbers the same.

** Protected ** or ** Unprotected ** appearing respectively.

RAM recall

The volatile RAM store has 100 locations numbered 0 to 99 for the full storage of instrument
settings. The parameters that are recalled are the same as those for full recall.

3-47

Recalling data

Select the memory recall function as follows:

(1) Press the [MEM] hard key and then, if necessary, press the [Store/Recall] soft key to display

MEMORY

the Memory Recall Menu shown in Fig. 3-46 below.

Fig. 3-46 Memory recall menu

B3936

(2) To recall data, press the [Full Store], [Carrier Store] or [RAM Store] key for the type of

recall required, then enter the store location via the numerical key pad and terminate with

[ENTER].

(3) Pressing [Memory Protect] causes a Memory Write Protection screen to be displayed. For

details of displaying the stores and changing their protection states see ‘Memory protection’

on page 3-47.

(4) Press [Factory Recall] to set the instrument to the factory settings (these are listed in

Table 3-1 above).

3-48

Error handling

Error messages are divided into four groups:

Error messages

(1) Background errors −

(2) Foreground errors −

(3) GPIB errors −

(4) Fatal errors −

Background errors:

These are generated due to an incorrect operating condition within the instrument. These errors are
generated automatically to warn the operator. For example if the reverse power protection circuit
should trip the message: Err 500: RPP tripped will be displayed on the main screen. Background
errors are listed in Table 3-2. Only one error will be displayed, that with the highest priority. To
obtain a full list of errors occurring on your instrument in priority order, select [Backg’nd Errors]
from the Utilities Selection Menu 1. This causes the Current Background Errors screen to be
displayed (see Fig. 3-30). Select [Next Page] if the list is continued on a subsequent page.

Foreground errors:

These are typically generated when an entered parameter value is outside the valid range or for
some other invalid operation. For example trying to set the carrier frequency above or below the
specified range will display the following message Err 100: Carrier limit on the screen. The
foreground errors are cleared upon function selection or by re-entering the parameter correctly.
Foreground errors are listed in Table 3-3.

represent a condition of the instrument.

generally caused by the user.

generated by incorrect programming.

caused by failure associated with the main RAM or the
PROM. These errors may or may not be displayed according
to the severity of the failure or corruption.

Error message priority:

A background error has a priority bit set which is used to determine which message needs to be
displayed. A foreground error will temporarily overwrite the background error if currently
displayed, but will return to displaying that error once the foreground error has been cleared.

GPIB errors

When an error occurs the error number is put into the error queue and the error message is
displayed. Clearing the error message from the screen does not clear the error queue, which is only
cleared by the GPIB command ERROR? query, which returns the error at the head of the queue, or
by the *CLS command which clears the whole error queue. GPIB errors are listed in Table 3-4.

The queue holds a maximum of 64 error message error numbers. If an error occurs while the
queue is full the last error number is replaced with 399 to indicate that the queue is full. The
ERROR? query returns a value of 399 for queue full and 0 for queue empty.

When an error number is written into the queue, a bit (<erb>) in the status byte register is set, and
an appropriate bit in the standard event register is also set (one of <cme>, <exe>, <dde> or <qye>).
These errors will also generate SRQ if the relevant bit in the status register is set. Many
background errors are also reported in the Hardware and Coupling Status Registers.

3-49

ERROR MESSAGES

Source-specific errors

Where it is necessary to identify the signal source causing an error, the error message number has
1000 or 2000 added to it for the A or B source respectively. Thus error number 2500 indicates that
the B source has tripped the reverse power protection circuit.

Table 3-2 Background errors (500 −−−− 599) in priority order

- - - 591 ftl Main PROM faulty

590 ftl Main RAM faulty - - -

- - - - - -

- - - - - -

- - - - - ­ 500 dde RPP tripped ‡ 501 dde Fractional-N loop low ‡
502 dde Fractional-N loop high ‡ 503 dde Ext standard missing

504 dde External std frequency low 505 dde External std frequency high
506 dde VCXO loop low ‡ 507 dde VCXO loop high ‡
508 dde Amplitude mod unleveled ‡ 509 dde Output unleveled ‡
510 dde High power amplifier failed ‡ 511 dde ALC too high ‡
512 dde ALC too low ‡ 513 dde DSP not responding ‡

- - - - - -

- - - - - -

- - - 549 exe RF level uncalibrated ‡
550 exe RF level limited by AM ‡ 551 exe AM2 limited by AM1 ‡
552 exe FM2 limited by FM1 ‡ 553 exe ΦM2 limited by ΦM1 ‡

554 - - 555 - ­ 556 - - 557 exe Carrier limited by coupling ‡

558 exe Offset limited by harmonic 559 exe Offset limited by sub-harm

560 exe Harmonic limited by offset 561 exe Sub-harm limited by offset

(‡ = Source-specific)

3-50

ERROR MESSAGES

Table 3-3 Foreground errors (0 −−−− 399)

0 dde No error 1 dde EEPROM checksum
2 dde Pad cal checksum ‡ 3 dde RF cal checksum ‡
4 dde Freq std checksum ‡ 5 dde Synthesizer cal checksum ‡
6 dde Mod ref checksum ‡ 7 dde Mod offset checksum ‡
8 dde Mod amp checksum ‡ 9 dde ALC cal checksum ‡
10 dde FM cal factor checksum ‡ 11 dde FM tracking checksum ‡
12 dde ΦM cal factor checksum ‡ 13 dde System cal checksum ‡
14 dde AM cal checksum ‡ 15 dde Store checksum

16 dde Image checksum 17 dde EEPROM unreliable
20 dde Frac-N out of lock at <freq> ‡ 21 dde VCO cal fail at <freq> ‡
22 dde VTF tune cal fail at <freq> ‡ 23 dde FM tracking cal fail at <freq> ‡

24 dde Local EEPROM write - - -

- 51 dde Keyboard buffer overflow

52 dde Display buffer overflow 53 dde Display missing

- - - - - ­ 62 dde Source not fitted ‡ - - ­ 100 exe Carrier limit ‡ 101 exe Carrier step limit ‡
102 exe RF level limit ‡ 103 exe RF level step limit ‡
104 exe Invalid modulation mode ‡ 105 exe AM limit ‡
106 exe AM2 limit ‡ 107 exe AM step limit ‡
108 exe AM2 step limit ‡ 109 exe FM limit ‡
110 exe FM2 limit ‡ 111 exe FM step limit ‡
112 exe FM2 step limit ‡ 113 exe ΦM limit ‡
114 exe ΦM2 limit ‡ 115 exe ΦM step limit ‡
116 exe ΦM2 step limit ‡ 117 exe Memory limit
118 exe AM mod freq limit ‡ 119 exe AM mod step limit ‡
120 exe AM2 mod freq limit ‡ 121 exe AM2 mod step limit ‡
122 exe FM mod freq limit ‡ 123 exe FM mod step limit ‡
124 exe FM2 mod freq limit ‡ 125 exe FM2 mod step limit ‡
126 exe ΦM mod freq limit ‡ 127 exe ΦM mod step limit ‡
128 exe ΦM2 mod freq limit ‡ 129 exe ΦM2 mod step limit ‡

130 exe Return/Transfer not allowed 131 exe Util limit
132 exe Start freq limit ‡ 133 exe Stop freq limit ‡
134 exe Sweep time limit 135 exe Sweep mode disabled ‡
136 exe Carrier phase limit ‡ 137 exe AM phase limit ‡
138 exe FM phase limit ‡ 139 exe ΦM phase limit ‡

140 exe Memory store limit 141 exe Memory recall limit

142 exe Display blanking limit 143 exe GPIB address limit

144 exe Latch address limit 145 exe Latch data limit
146 exe Freq std carrier limit ‡ 147 exe Freq std course adj limit ‡
148 exe Freq std fine adj limit ‡ 149 exe Mod ref adj limit ‡

170 exe Util not available 171 exe Entry outside limits

172 exe Data out of range 173 exe Units not valid
174 exe Unlev fact limited by FM fact ‡ 175 exe Invalid baud rate

176 exe Data overrun 177 exe Data parity

178 exe Data framing 179 exe Break in data

3-51

continued

ERROR MESSAGES

Foreground errors (0 −−−− 399) −−−− continued

180 exe Transmit buffer full 181 exe Receiver not enabled

182 exe Protected utility - Level 1 183 exe Protected utility - Level 2

184 - - 185 exe This store is Read Only

186 - - 187 - ­ 188 exe Receive buffer full 189 exe Pulse has been disabled ‡

190 exe No attenuator fitted 191 exe No high power amp fitted
192 - - 193 exe Ext DCFM mod mode required ‡

- - - 195 exe Invalid coupling mode ‡

196 exe Invalid in application mode - - ­ 198 exe Atten lock disabled ‡ 199 exe Atten lock not allowed ‡

200 exe Atten lock not allowed ‡ 201 exe Atten lock not allowed

202 exe No pulse with application - - -

398 - - 399 exe Error queue full

(‡ = Source-specific)

Table 3-4 GPIB errors (400 - 499)

400 cme Syntax error 401 cme Unrecognized mnemonic

402 cme Numeric syntax 403 cme Data expected

404 cme Illegal data 405 cme Too much data

406 cme Incorrect data type 407 cme Unrecognized character data

408 cme Character data not unique 409 cme Block definition

410 cme Block size 411 cme Missing quote

412 cme Terminator expected 413 cme Invalid unit

414 cme Unit not expected 415 cme No header match found

416 cme Header not unique 417 cme Illegal star command

418 cme Sub-command not allowed 419 cme Action not allowed with header

420 cme Query not allowed with header 421 cme Parser decode

- - - - - -

- - - - - -

- - - - - -

- - - - - -

450 qye Query INTERRUPTED 451 qye Query UNTERMINATED

452 qye Query DEADLOCK 453 qye Query lost after arbitrary char

- - - - - -

- - - - - -

- - - - - -

3-52

Summary

Chapter 4

SETUP

The setup menus are used to route the outputs from the signal sources to either their individual RF
OUTPUT sockets or, via the combiner, to the CONNECTION TO RADIO socket and additionally
allow the sources to be coupled together by a mathematical formula in both frequency and level.
The routing is set using the combiner setup facility and the coupling parameters are enabled and set
using the coupling setup facility.

The applications facility allows the user to select one of a number of common test configurations,
such as intermodulation testing for two signal sources. When an application is selected the most
appropriate signal routing is automatically chosen and the required coupling controls enabled.
Control parameters are then redefined in terms of the measurement being performed to minimize
the number of parameter entries required. For example, for intermodulation testing with equal
amplitude sources, only one RF level control is provided and this automatically sets the level of
both sources. Control parameters are described in terms which are relevant to the measurement
being performed.

Setup menu selection

Pressing the [SETUP] key gains access to the Setup Menu similar to that shown in Fig. 4-1 below.

The [Appl’n Menu] key accesses the Applications Selection Menu which enables you to select one
of the three predefined applications. The [Combiner Setup] key accesses the Combiner Setup
Menu which enables you to connect the signal sources in any combination to the combiner. The
combined signal is then available at the CONNECTION TO RADIO socket. [Coupling Setup]
accesses the Frequency and Level Coupling menu which enables you to couple the B source to the
A source. This source can then track the A source by means of a level offset and a frequency and
harmonic offset.

Fig. 4-1 Setup menu

4-1

This facility allows the user to route an individual signal source (A or B) to either its designated
separate RF OUTPUT connector or through the combiner to the CONNECTION TO RADIO
connector. The current routing of the signal sources is always indicated by the source field at the
bottom of the display. If both sources are routed to their separate connectors the combiner panel
shows å not used.

Combiner selection

Select the required signal source-combiner configuration as follows:

(1) On the Setup Menu press [Combiner Setup] to display the Combiner Setup Menu. This

shows a graphical display of the current combiner setup similar to Fig. 4-2 below.

Combiner setup

(2) Pressing the [O/P / å

own RF OUTPUT connector (shown by O/P on the display) or, via the combiner, to the

CONNECTION TO RADIO connector (shown by å). Use these keys to select your required

configuration. As shown by the display, the external INPUT FROM RADIO TEST SET

socket is permanently connected to the combiner.

(3) At each change in configuration the A and B source panels and the combined output å panel

at the bottom of the display change to show the new destinations. These settings are repeated

on all menus.

(4) Pressing the [Indep’nt/Combiner] key switches between the current configuration having a

combiner output and both sources having independent outputs. This provides a convenient

way to restore the sources to normal, independent operation.

(5) Selecting [EXIT] returns you to the Setup Menu.

External source

Provision is made on the rear panel for connecting an external signal generator to the combiner via
the INPUT FROM RADIO TEST SET (shown by EXT IN in Fig. 4-2 above).

Fig. 4-2 Combiner setup menu

]

key for a particular source toggles between connecting the source to its

4-2

Frequency and level coupling

Many measurements are made where it is convenient if the carrier frequencies and RF levels of
signal sources are automatically related to each other. The coupling setup facility allows two
signal sources to be coupled together in frequency and/or level. The frequencies can be coupled
with a defined offset value (for example 10.7 MHz), and can be harmonically related. The
harmonic relationship is useful where a harmonic sampling gate or divider is being tested. RF
levels can be entered in dB. Coupling factors of the B source are always set relative to the A
source.

The frequency coupling is entered in the form:

Coupling

where N is an integer between 1 and 9

The B source can be coupled only by entering its value relative to the A source. Offsets can have
either positive or negative values.

Whenever a coupling factor has been set the signal generator display clearly identifies the presence
of coupling factors in the frequency or level display fields by displaying an icon of the form ðB
under the frequency/level units to indicate which source that parameter is currently coupled to.

Coupling selection

To set the coupling factors proceed as follows:

(1) On the Setup Menu press the [Coupling Setup] key to display the Frequency and Level

Frequency (B) = frequency (A)

Frequency (B) = frequency (A)/N

Coupling menu (see Fig. 4-3 below). The screen is split horizontally into two, with the upper

part displaying the frequency coupling parameters and the lower part displaying the level

coupling parameters.

× N + offset frequency

OR

+ offset frequency

Fig. 4-3 Frequency and level coupling menu

4-3

COUPLING

Frequency

(2) Select the required source by pressing [A & B Coupling].

(3) Select [Freq Offset] and enter the required offset from the A source, positive or negative, up

to the instrument’s maximum frequency and terminate with the [Hz], [kHz], [MHz] or [GHz]

key.

(4) To set the B source to a frequency which is a harmonic or sub-harmonic of the A source press

the [Harmonic/Sub-harm] key. This key toggles the soft key selection between [Freq

Harmonic] and [Freq Sub-harm]. Enter the required harmonic or sub-harmonic in the range

1 to 9 and terminate with any [ENTER] key.

(5) Press [Enable/Disable] which toggles between the two states shown on the display. When

Enable is selected, the Sig Gen menu is modified by the addition of an arrow and the letter

for the coupled source in the frequency field. Thus ðB indicates that the A source is coupled

to the B source.

Level

(2) Select the required source by pressing [A & B Coupling].

(3) Select [Level Offset] and enter the required offset from the A source, positive or negative,

and terminate with the [dB] key.

(4) Press [Enable/Disable] which toggles between the two states shown on the display. When

Enable is selected, the Sig Gen Menu is modified by the addition of an arrow and the letter

for the coupled source in the RF level field.

4-4

Applications summary

The 2026Q Multisource Generator supports a number of measurement applications which require
two signal sources to be coupled together. In addition to automatically selecting the most
appropriate signal routing format, the applications mode also automatically couples the sources
together and modifies the descriptions of the parameters entered to best suit the application. This
considerably simplifies control of the sources and provides a clearer description of the
measurement being performed.

Whenever an application is selected, the signal routing can be displayed in graphical form to
ensure that the user understands how the sources are connected to the RF connectors. In addition,
a stylized spectral diagram can be displayed which shows how the main control parameters are
used in the test.

Applications selection

Applications

To select one of the predefined applications press the [Appl’n Menu] key on the Setup Menu. This
causes the Applications Selection Menu similar to that shown in Fig. 4-4 below to be displayed.

Fig. 4-4 Applications selection menu

This menu enables you to perform two-tone intermodulation distortion tests on an amplifier, or
carry out a receiver selectivity test. Intermodulation tests require the presence of a strong
interfering signal whose intermodulation products fall in the receiver’s or amplifier’s input
frequency band.

4-5

APPLICATIONS

Amplifier intermodulation distortion application

Intermodulation tests on amplifiers are a good indication of the linearity of an amplifier. Many
communication systems require devices able to carry two or more signals without introducing
spurious frequencies which might affect system performance. The 2026Q can support 2-tone
intermodulation testing. The number of tones can also be increased by using the external source
input, INPUT FROM RADIO TEST SET, for the connection of external generators.

Two-tone test

In this test two tones are input to an amplifier. Amplifier output will comprise not only the two
applied tones but also, due to amplifier non-linearity, intermodulation products. One tone is
provided from source A at the required amplifier frequency. The second interfering tone is
provided from source B at a different frequency but same amplitude.

Procedure

You can carry out an intermodulation distortion test on an amplifier as follows:

(1) Press [Amplifier IM] which displays the Intermod. Distortion Test on Amplifier block

diagram as shown in Fig. 4-5 below.

Fig. 4-5 Intermodulation distortion test on amplifier block diagram

(2) Connect the amplifier under test to the output from the combiner (CONNECTION TO

RADIO socket) as shown by the block diagram.

(3) Press [Spectral Diagram] which displays the Intermod. Distortion Test on Amplifier spectral

diagram as shown in Fig. 4-6 below.

Fig. 4-6 Intermodulation distortion test on amplifier spectral diagram

4-6