INSTRUCTION BOOK
OPERATING INSTRUCTIONS
TERMALINE
®
RF COAXIAL
LOAD RESISTOR
MODELS 8072A-1 and 8072A-2
Electronic Corporation
Cleveland (Solon) Ohio USA
©Copyright 1997 by Bird Electronic Corporation
Instruction Book Part Number 920-8072A Revision C
Termaline
®
is a Registered Trademark
of Bird Electronic Corporation
ii
Safety Precautions
USAGE
ANY USE OF THIS INSTRUMENT IN A MANNER NOT
SPECIFIED BY THE MANUFACTURER MAY IMPAIR
THE INSTRUMENT’S SAFETY PROTECTION.
USO
EL USO DE ESTE INSTRUMENTO DE MANERA NO
ESPECIFICADA POR EL FABRICANTE, PUEDE ANULAR
LA PROTECCIÓN DE SEGURIDAD DEL INSTRUMENTO.
BENUTZUNG
WIRD DAS GERÄT AUF ANDERE WEISE VERWENDET
ALS VOM HERSTELLER BESCHRIEBEN, KANN DIE
GERÄTESICHERHEIT BEEINTRÄCHTIGT WERDEN.
UTILISATION
TOUTE UTILISATION DE CET INSTRUMENT QUI
N’EST PAS EXPLICITEMENT PRÉVUE PAR LE FABRICANT PEUT ENDOMMAGER LE DISPOSITIF DE PROTECTION DE L’INSTRUMENT.
IMPRIEGO
QUALORA QUESTO STRUMENTO VENISSE
UTILIZZATO IN MODO DIVERSO DA COME
SPECIFICATO DAL PRODUTTORE LA PROZIONE DI
SICUREZZA POTREBBE VENIRNE COMPROMESSA.
SERVICE
SERVICING INSTRUCTIONS ARE FOR USE BY SERVICE
-TRAINED PERSONNEL ONLY. TO AVOID DANGEROUS
ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING
UNLESS QUALIFIED TO DO SO.
WARTUNG
ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES
GELTEN NUR FÜR GESCHULTES FACHPERSONAL.
iii
ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE
SCHOCKS, SID WARTUNGSARBEITEN
AUSSCHLIEßLICH VON QUALIFIZIERTEM
SERVICEPERSONAL DURCHZUFÜHREN.
ENTRENTIEN
L’EMPLOI DES INSTRUCTIONS D’ENTRETIEN DOIT
ÊTRE RÉSERVÉ AU PERSONNEL FORMÉ AUX
OPÉRATIONS D’ENTRETIEN. POUR PRÉVENIR UN
CHOC ÉLECTRIQUE DANGEREUX, NE PAS
EFFECTUER D’ENTRETIEN SI L’ON N’A PAS ÉTÉ
QUALIFIÉ POUR CE FAIRE.
ASSISTENZA TECNICA
LE ISTRUZIONI RELATIVE ALL’ASSISTENZA SONO
PREVISTE ESCLUSIVAMENTE PER IL PERSONALE
OPPORTUNAMENTE ADDESTRATO. PER EVITARE
PERICOLOSE SCOSSE ELETTRICHE NON
EFFETTUARRE ALCUNA RIPARAZIONE A MENO CHE
QUALIFICATI A FARLA.
iv
The following are general safety precautions that are not necessarily related
to any specific part or procedure, and do not necessarily appear elsewhere in
this publication. These precautions must be throughly understood, and apply
to all phases of operation and maintenance.
Shock Hazard
Do not attempt to disconnect an RF transmission line while RF power is pres
ent. Radiated RF power is a potential health hazard.
Chemical Hazard
Dry cleaning solvents used to clean parts may be dangerous. Avoid inhalation
of fumes and also prolonged contact with skin.
Resuscitation
Personnel working with or near high voltages should be familiar with modern
methods of resuscitation.
Safety Symbols
WARNING
Warning notes call attention to a procedure, which if not correctly
performed, could result in personal injury.
CAUTION
Caution notes call attention to a procedure, which if not correctly
performed, could result in damage to the instrument.
This symbol appears on the equipment indicating there is im
portant information in the instruction manual regarding that
particular item.
-
-
8072A-1 and 8072A-2 Warning Statements
The following safety warnings appear in the text and are repeated here for
emphasis.
WARNING
Never attempt to connect or disconnect the equipment from the
transmission line while RF power is applied. Leaking RF energy is a
potential health hazard.
v
Models 8072A-1 & 8072A-2 Termaline RF Coaxial Load Resistor
WARNING
This product contains a resistor substrate made of Beryllium oxide. This
is a potentially toxic ceramic and may be harmful to your health.
Beryllium oxide must be disposed of in accordance with the legal
statutes dealing with hazardous material.
vi
Table of Contents
Safety Precautions ........................i
Warning Statements ....................v
Introduction ....................1
Description ...........................1
Installation ...........................1
Unpacking and Inspection ..................1
Connections ........................1
Maintenance ....................3
Sales/Repair Facility.....................3
Sales Offices ........................3
Cleaning..........................4
Measure dc Resistance of Load ................4
Specifications ..........................5
vii
Models 8072A-1 & 8072A-2 Termaline RF Coaxial Load Resistor
4.395
4.395
REF.
2.000
.520 REF.
REF.
-CAUTION-
-CAUTION-
MAX.POWER RATING IS 300 WATTS
MAX.POWER RATING IS 300 WATTS
WHENBOLTED TO A HEAT SINK
WHENBOLTED TO A HEAT SINK
(1/8")ALUM. X 800 SQ. IN.
(1/8")ALUM. X 800 SQ. IN.
1.032
1.032
viii
Outline Drawing
Chapter 1
Introduction
This instruction book is intended for use by operators and in
stallers of the Model 8072A-1 and 8072A-2 load resistor.
Description
The Bird Model 8072A-1 and 8072A-2 Termaline Coaxial
Load Resistor is a dry (air dielectric), conduction cooled
(needs heat sink), type 50-ohm RF (Radio Frequency) line
termination. It is capable of dissipating 300 W of continuous
power when properly mounted to a suitable heat sink. The
load is designed for a reflection-free termination of a trans
mission line and is efficient in any position. The Model
8072A-1 and 8072A-2 is normally supplied with an N-Type
Female connector.
Installation
Unpacking
and
Inspection
Connections A suitable heat sink is required. It must be of such capacity
All packages are carefully inspected prior to shipment. If
package shows any sign of damage, promptly inspect the device. If any damage is visible, notify the shipping carrier and
Bird Electronic of the damage.
Retain the shipping materials for repackaging.
that at 300 W of continuous input, the temperature on top of
the load body will not exceed 155°C (311°F). Use an alumi
num plate of at least 800 sq. in. by 1/8 in. thick (5200cm² x
3mm) or equivalent.
-
-
-
Attach the load to a suitable heat sink as follows:
1. Apply a thin film of heat transfer compound over
the entire mating surface.
+
NOTE: The film, when flattened, must not ex
ceed a thickness of 0.001 inch.
2. Mount the load to the heat sink using six mount
ing screws, preferably stainless steel, and of suit
able length to include the 1-1/32 inch load body,
heat sink thickness, washer and nut.
-
-
-
1
Models 8072A-1 & 8072A-2 Termaline RF Coaxial Load Resistor
NOTE: A tapped heat sink can be used instead
+
of using a washer and nut.
3. To ensure a proper thermal contact, torque the
mounting screws to 25 to 30 inch-pounds.
WARNING
Never attempt to connect or disconnect the equipment
from the transmission line while RF power is being
applied. Leaking RF energy is a potential health hazard
.181 DIA. THRU HOLES
6 PLACES
4. Using a suitable cable, as short as convenient, at
tach the RF power source to the load with a mat
ing connector.
5. Tighten all connections.
6. Ensure the heat sink has ventilation adequate to
maintain the loads body temperature to a maximum of 155°C (311°F) on top.
.344
1.250
3.656
1.719
-
-
O.C.
1.400
2.000
Mounting Template
2
Chapter 2
Maintenance
WARNING
This product contains a resistor substrate made of
beryllium oxide. This is a potentially toxic ceramic and
may be harmful to your health. Beryllium Oxide must
be disposed of in accordance with the legal statues
dealing with hazardous material.
Any maintenance beyond the scope of those provided in this
section should be referred to a qualified service center.
All instruments returned for service must be shipped prepaid
and to the attention of the Customer Service Group.
Sales/Repair
Facility
Sales Offices For the location of the sales office nearest you, give us a call
U.S.A. Sales and Manufacturing
Bird Electronic Corporation
30303 Aurora Road
Cleveland (Solon), OH 44139-2794
Phone: (440) 248-1200
Fax: (440) 248-5426
or visit our Web site at:
http://www.bird-electronic.com
3
Models 8072A-1 & 8072A-2 Termaline RF Coaxial Load Resistor
Cleaning 1. Gently remove loose dirt and grime using a soft
clean cloth dampened detergent and water. Do
not use paint thinner or other solvents that may
cause damage to the finish.
Measure dc
Resistance of
Load
2. RF Connectors - Clean RF connectors with a cot
ton swab dampened with alcohol, or any accept
-
-
able dry cleaning solvent.
NOTE: Keep the RF connectors covered when
+
not in use. This will prevent dust and dirt from
accumulating in the connectors.
Items required:
Multimeter or ohmmeter with accuracy of ±1% @ 50 ohms.
Temperature of the load @ 20° to 25° C (68° to 77° F).
VSWR and RF Impedance are the true benchmark of a quality dummy load. Checking the dc resistance is simply used to
measure a change in the condition of the resistor over time.
The tracking of the dc resistance must start before the resistor is first put into service. Perform the following steps and
record the value for future comparison. Check and record the
resistance of the load periodically according to use.
WARNING
Never attempt to connect or disconnect the equipment
from a transmission line while RF power is applied.
Leaking RF energy is a potential health hazard.
1. Disconnect RF Coaxial Line.
2. Connect multimeter with a short length of low re
sistance cable equipped with a Male N (or appli
-
cable) connector, or connect multimeter test leads
across center and outer conductor of the load re
sistor.
3. Record the value of the resistance before the load
is put into service. Compare subsequent values
with the latest reading. If the values vary more
than 2 ohms this could be an indication of a fail
-
ing resistive element.
4
Specifications
Maintenance
Power Rating
w/ heat sink
Frequency Range & VSWR
Model 8072A-1
Model 8072A-2
Ambient Temperature -40° to +45°C (-40° to 113°F)
Heat Sink Required 800 sq. in. plate x 1/8"
Input Impedance 50 ohms
Connector N-Type Female
Finish Semi-Gloss black enamel
Load Coolant Dry, Conduction cooled
Operating Position Any
Nominal Size 4-25/64" x 2" x 1-1/32" (110 x 51 x 26mm)
Weight Nominal 12 oz. (.34kg)
Mounting Six screws, Torqued to 25 to 30 in/lb
300 W Continuous when mounted to a
suitable heat sink.
dc to 1 GHz at 1.10 Max.
1GHz to 2.4 GHz at 1.25 Max.
2.7 to 2.9 GHz at 1.15 Max
(5200cm² x 3.2mm) or equivalent
(Includes connectors)
5
Limited Warranty
All products manufactured by Seller are warranted to be free from defects in
material and workmanship for a period of one (1) year, unless otherwise spec
ified, from date of shipment and to conform to applicable specifications, draw
ings, blueprints and/or samples. Seller’s sole obligation under these
warranties shall be to issue credit, repair or replace any item or part thereof
which is proved to be other than as warranted; no allowance shall be made
for any labor charges of Buyer for replacement of parts, adjustment or re
pairs, or any other work, unless such charges are authorized in advance by
Seller.
If Seller’s products are claimed to be defective in material or workmanship or
not to conform to specifications, drawings, blueprints and/or samples, Seller
shall, upon prompt notice thereof, either examine the products where they
are located or issue shipping instructions for return to Seller (transporta
tion-charges prepaid by Buyer). In the event any of our products are proved
to be other than as warranted, transportation costs (cheapest way) to and
from Seller’s plant, will be borne by Seller and reimbursement or credit will
be made for amounts so expended by Buyer. Every such claim for breach of
these warranties shall be deemed to be waived by Buyer unless made in writing within ten (10) days from the date of discovery of the defect.
The above warranties shall not extend to any products or parts thereof which
have been subjected to any misuse or neglect, damaged by accident, rendered
defective by reason of improper installation or by the performance of repairs
or alterations outside of our plant, and shall not apply to any goods or parts
thereof furnished by Buyer or acquired from others at Buyer’s request and/or
to Buyer’s specifications. In addition, Seller’s warranties do not extend to the
failure of tubes, transistors, fuses and batteries, or to other equipment and
parts manufactured by others except to the extent of the original manufac
turer’s warranty to Seller.
-
-
-
-
-
The obligations under the foregoing warranties are limited to the precise
terms thereof. These warranties provide exclusive remedies, expressly in lieu
of all other remedies including claims for special or consequential damages.
SELLER NEITHER MAKES NOR ASSUMES ANY OTHER WARRANTY
WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR IMPLIED, IN
CLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS, AND
NO PERSON IS AUTHORIZED TO ASSUME FOR SELLER ANY OBLIGA
TION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE
FOREGOING.
6
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