Comtech EF Data LTT1450G User Manual

LTT1450G

Ku-Band Loop Test Translator

Installation and Operation Manual

TM063 - Rev. 1
February, 1997

- NOTICE -

1997, Radyne Corporation. All rights reserved. Unauthorized
reproduction of this manual in any form without the expressed
written approval of Radyne Corporation is strictly prohibited.
This manual may not in whole or in part be copied, reproduced,
translated or reduced to any electronic or magnetic storage
medium without the written consent of a duly authorized officer
of Radyne Corporation.

Radyne Corporation • 5225 South 37th St. • Phoenix, AZ 85040 • [phone] • Fax: [phone]

LTT1450G Ku-Band Loop Test Translator Warranty Policy

RADYNE WARRANTY POLICY

WARRANTY AND SERVICE

Radyne (Seller) warrants the items manufactured and sold by Radyne to be free of defects in material
and workmanship for a period of two (2) years from date of shipment Radyne's obligation under its
warranty is limited in accordance with the periods of time and all other conditions stated in all
provisions of this warranty.

This warranty applies only to defects in material and workmanship in products manufactured by
Radyne. Radyne makes no warranty whatsoever concerning products or accessories not of its
manufacture.

Repair, or at Radyne's option, replacement of the Radyne products or defective parts therein shall be
the sole and exclusive remedy for all valid warranty claims.

WARRANTY PERIOD

The applicable warranty period shall commence on the date of shipment from Radyne's facility to the
original purchaser and extend for the stated period following the date of shipment. Upon beginning of
the applicable Radyne warranty period, all customer's remedies shall be governed by the terms stated
or referenced in this warranty. In-warranty repaired or replacement products or parts are warranted
only for the remaining unexpired portion of the original warranty period applicable to the repaired or
replaced products or parts. Repair or replacement of products or parts under warranty does not
extend the original warranty period.

WARRANTY COVERAGE LIMITATIONS

The following are expressly not covered under warranty:

1. Any loss, damage and/or malfunction relating in any way to shipping, storage, accident, abuse,
alteration, misuse, neglect, failure to use products under normal operating conditions, failure to use
products according to any operating instructions provided by Radyne, lack of routine care and
maintenance as indicated in any operating maintenance instructions, or failure to use or take any
proper precautions under the circumstances.

2. Products, items, parts, accessories, subassemblies, or components which are expendable in
normal use or are of limited life, such as but not limited to, bulbs, fuses, lamps, glassware, etc.

Radyne reserves the right to revise the foregoing list of what is covered under this warranty.

WARRANTY REPLACEMENT AND ADJUSTMENT

Radyne will not make warranty adjustments for failures of products or parts which occur after the
specified maximum adjustment period. Unless otherwise agreed, failure shall be deemed to have
occurred no more than seven (7) working days before the first date on which a notice of failure is
received by Radyne. Under no circumstances shall any warranty exceed the period stated above
unless expressly agreed to in writing by Radyne.

TM063 - Rev. 1 ii

Warranty Policy LTT1450G Ku-Band Loop Test Translator

LIABILITY LIMITATIONS

This warranty is expressly in lieu of and excludes all other express and implied warranties, including
but not limited to warranties of merchantability and of fitness for particular purpose, use, or
applications, and all other obligations or liabilities on the part of Radyne, unless such other warranties,
obligations, or liabilities are expressly agreed to in writing by Radyne.

All obligations of Radyne under this warranty shall cease in the event its products or parts thereof
have been subjected to accident, abuse, alteration, misuse or neglect, or which have not been
operated and maintained in accordance with proper operating instructions.

IN NO EVENT SHALL RADYNE BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, SPECIAL OR
RESULTING LOSS OR DAMAGE OF ANY KIND HOWSOEVER CAUSED. RADYNE’S LIABILITY
FOR DAMAGES SHALL NOT EXCEED THE PAYMENT, IF ANY, RECEIVED BY RADYNE FOR
THE UNIT OR PRODUCT OR SERVICE FURNISHED OR TO BE FURNISHED, AS THE CASE MAY
BE, WHICH IS THE SUBJECT OF CLAIM OR DISPUTE.

Statements made by any person, including representatives of Radyne, which are inconsistent or in
conflict with the terms of this warranty, shall not be binding upon Radyne unless reduced to writing
and approved by an officer of Radyne.

WARRANTY REPAIR RETURN PROCEDURE

Before a warranty repair can be accomplished, a Repair Authorization must be received. It is at this
time that Radyne will authorize the product or part be returned to the Radyne facility or if field repair
will be accomplished. The Repair Authorization may be requested in writing or by telephoning:

Radyne Corporation

5225 South 37th Street
Phoenix, Arizona 85040 (USA)
ATTN: Customer Support
Phone: [phone] Fax: [phone]
Any product returned to Radyne for examination must be sent prepaid via the means of transportation

indicated as acceptable to Radyne. Return Authorization Number must be clearly marked on the
shipping label. Returned products or parts should be carefully packaged in the original container, if
possible, and unless otherwise indicated, shipped to the above address.

NON-WARRANTY REPAIR

When a product is returned for any reason, Customer and its shipping agency shall be responsible for
all damage resulting from improper packing and handling, and for loss in transit, not withstanding any
defect or nonconformity in the product. By returning a product, the owner grants Radyne permission
to open and disassemble the product as required for evaluation. In all cases, Radyne has sole
responsibility for determining the cause and nature of failure, and Radyne's determination with regard
thereto shall be final.

TM063 - Rev. 1 iii

LTT1450G Ku-Band Loop Test Translator Record of Revisions

LTT1450G Ku-Band Loop Test Translator

Installation and Operation Manual

TM063 - Record of Revisions

Radyne Corporation is constantly improving its products and therefore the information in this document is
subject to change without prior notice. Radyne Corporation makes no warranty of any kind with regard to
this material, including but not limited to the implied warranties of merchantability and fitness for a
particular purpose. No responsibility for any errors or omissions that may pertain to the material herein is
assumed. Radyne Corporation makes no commitment to update nor to keep current the information
contained in this document. Radyne Corporation assumes no responsibility for use of any circuitry other
than the circuitry employed in Radyne Corporation’s systems and equipment.

Revision

Level

Date Reason for Change

1 2-24-97 Initial Release

TM063 - Rev. 1 iv

LTT1450G Ku-Band Loop Test Translator Table of Contents

Table of Contents

1.0 Introduction…..………………………………………………………………………………………… 1-1

1.1 Model LTT1450G Ku-Band Translator Overview………………………………………………….. 1-1

2.0 Installation Requirements…..…...…………………………………………………………………… 2-1

2.1 Mounting….………..…………………………………………………………………………………… 2-1

2.2 Power-Up…..…………….…..………………………………………………………………………… 2-1

2.3 Apply Signals..…………………………………………………………………………………………. 2-2

2.4 Receive Signal Injection.….…………………………………………………………………………2-2

2.5 Hardware Description………………………………………………………………………………… 2-2

2.5.1 Ku-Band PLO….……………………………………………………………………………………2-3

2.5.2 Ku-Band Converter Module..……..……………………………………………………………… 2-3

2.5.3 Microcontroller PWB AS/1030…………………………………………………………….. 2-4

3.0 Operating Procedures ..……………..….……………………………………………………………. 3-1

3.1 Operator Controls……..……..……………………………………………………………………… 3-1

3.1.1 Power On/Off……………………………………………………………………………………… 3-1

3.1.2 Power LED…………………………………………………………………………………………… 3-1

3.1.3 FREQ ADJ.………………………………………………………………………………………… 3-1

3.1.4 RCV Monitor………………………………………………………………………………………… 3-1

3.1.5 EXT Reference LED………………………………………………………………………………… 3-1

3.1.6 Remote LED………………………………………………………………………………………… 3-2

3.1.7 LO Fault..……………………………………………………………………………………………3-2

3.1.8 LCD Display…………………………………………………………………………………………3-2

3.2 Pushbutton Panel.…………………………………………………………………………………… 3-2

3.3 Rear Panel Connectors and Adjustments……………………………………………………………3-3

3.3.1 TX and RX RF I/O………………………………………………………………………………….. 3-3

3.3.2 REF IN……………………………………………………………………………………………… 3-3

TM063 - Rev. 1 v

LTT1450G Ku-Band Loop Test Translator Table of Contents

3.3.3 REF OUT…………………………………………………………………………………………… 3-3

3.3.4 Test Fault (J5)………………………………………………………………………………………3-3

3.3.5 Serial Port (J6)……………………………………………………………………………………… 3-4

3.3.6 GND………………………………………………………………………………………………… 3-5

3.3.7 100/240 Vac Power Entry Module………………………………………………………………… 3-5

4.0 Confidence Test and Troubleshooting……………………………………………………………… 4-1

4.1 Confidence Test Procedure………………………………………………………………………… 4-1

4.1.1 Power ON Testing……….………………………………………………………………………… 4-1

4.1.2 Transfer Characteristics Testing….……………………………………………………………… 4-1

4.1.3 Attenuator Calibration Testing.…..…….……………………………………………………………4-2

4.1.4 Spectral Response Testing……..…………………………………………………………………4-2

4.2 Troubleshooting....……………………………………………………………………………………4-2

4.2.1 LO Fault….……….…………………………………………………………………………………4-2

4.2.2 Transfer Characteristics Faults…..……………………………………………………………… 4-3

4.3 Attenuator DAC and Calibration...…..………………………………………………………………4-3

5.1 Introduction……………..…..………………………………………………………………….………. 5-1

5.2 Command Structure………………………………………………………………………………… 5-1

5.2.1 Status Prompt....……………………………………………………………………………………5-1

5.2.2 Control Commands…...……………………………………………………………………………5-2

5.3 Status Commands..…..………………………………………………………………………………5-3

5.4 Calibration Commands…..…………………………………………………………………………… 5-4

5.4.1 Set-Calibrate-Mode Command.…………………………………………………………………… 5-4

5.4.2 Valid Commands while in CAL Mode…..………………………………………………………… 5-4

Appendix A - Technical Specifications..……………………………………………………………… A-1

Appendix B - Configuration Drawings…………………………………………………………………... B-1

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LTT1450G Ku-Band Loop Test Translator Table of Contents

TM063 - Rev. 1

vii

LTT1450G Ku-Band Loop Test Translator Description

Section One - LTT1450G

Ku-Band Loopback Test Translator Description

1.0 Introduction

This manual is designed to serve as a guide during installation, operation, and interfacing of the Model
LTT1450G Ku-Band Loopback Test Translator. This manual describes operation of the microwave,
analog, and digital circuitry found in the translator. This dialogue is offered to provide insight into the
normal operation of the system as well as to provide assistance in identifying a faulty subsystem. The
level of description in this manual is not intended to provide information for component level test or
alignment. These functions are best performed by trained factory technicians.

Figure 1-1. LTT1450G Front Panel

1.1 Model LTT1450G Ku-Band Translator Overview

The Model LTT1450G Global Ku-band Loopback Test Translator is designed to provide frequency
conversion of Ku-Band earth terminal uplink transmit carrier signals to earth terminal downlink receive
carrier signals for the purpose of testing all of the transmit and receive hardware simultaneously in the
earth terminal prior to acquiring actual satellite transponder space. Digital information to the MODEM
equipment will be received where it can be compared to that which was transmitted for the purpose of
determining a precise bit error rate. This function is normally provided by a bit error rate monitor (BER
Tester).

The LTT1450G translator is capable of converting Ku-Band uplink signals in the uplink 500 MHz band.
Uplink signals from either the output of the upconverter or HPA in the frequency range of 14.0 to 14.5
GHz are translated in four user-selectable 500 MHz bands covering the downlink frequency range of

10.95 to 12.70 GHz.

Output signal gain is variable in 0.1 dB increments via the front panel pushbuttons or serial remote
control. A PIN diode attenuator provides voltage controlled attenuation of the output signals in one dB
steps over the range of 00 to 60 dB. The serial port allows remote control of attenuation in precise 0.1dB
steps.

The local oscillator used in the translator is a four-band high-Q oscillator, phase locked to a 25 MHz
intermediate frequency crystal oscillator. The 25 MHz crystal oscillator is in turn locked to either an
internal 10.000 MHz ovenized SC-cut 3rd overtone crystal oscillator or to an external 5 or 10 MHz
external reference. The dual loop architecture used in the PLOs provide for a typical 14 dB
improvement over 20 Log N. In this way, the phase noise of the local oscillators is independent of the
phase noise of the internal or external 5 or 10 MHz references.

TM063 - Rev. 1 Page 1-1

Description LTT1450G Ku-Band Loop Test Translator

The use of an external reference allows the translation to be phase coherent with the external reference.
The frequency of translation will track the frequency of the external reference to approximately 200 KHz
at the output frequency. This allows the external reference to contain Doppler information.

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