BIRD TERMLINE 8141 User manual

Termaline®
Load Resistor
Operation Manual
Model 8141
©Copyright 2016 by Bird Electronic Corporation
Instruction Book Part Number 920-8141 Rev. D
Termaline is a trademark of Bird Electronic Corporation

i
Safety Precautions
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 thoroughly understood and apply to all
phases of operation and maintenance.
WARNING
Keep Away From Live Circuits
Operating Personnel must at all times observe general safety precautions. Do
not replace components or make adjustments to the inside of the test
equipment with the high voltage supply turned on. To avoid casualties,
always remove power.
WARNING
Shock Hazard
Do not attempt to remove the RF transmission line while RF power is present.
WARNING
Do Not Service Or Adjust Alone
Under no circumstances should any person reach into an enclosure for the
purpose of service or adjustment of equipment except in the presence of
someone who is capable of rendering aid.
WARNING
Safety Earth Ground
An uninterruptible earth safety ground must be supplied from the main
power source to test instruments. Grounding one conductor of a two
conductor power cable is not sufficient protection. Serious injury or death
can occur if this grounding is not properly supplied.
WARNING
Resuscitation
Personnel working with or near high voltages should be familiar with modern
methods of resuscitation.
WARNING
Remove Power
Observe general safety precautions. Do not open the instrument with the
power on.

Safety Precautions
ii
Safety Symbols
Note: Calls attention to supplemental information.
Warning Statements
The following safety warnings appear in the text where there is danger to
operating and maintenance personnel, and are repeated here for emphasis.
See page 6 .
See page 11 .
Caution Statements
The following equipment cautions appear in the text and are repeated here for
emphasis.
CAUTION
See page 5 .
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.
WARNING
Never attempt to disconnect RF equipment from the transmission line while
RF power is being applied. Leaking RF energy is a potential health hazard.
WARNING
This product contains substrate made of beryllium oxide. This is a potentially
toxic ceramic and may be harmful to health. Beryllia oxide must be disposed
of in accordance with the legal statutes dealing with hazardous material.
Do not attempt to repair this unit, but return to BIRD ELECTRONIC
CORPORATION.
Do not operate this equipment over the rated 250 watts continuously.
Damage to the resistive element will result.

Termaline® Coaxial Load Resistor
iii
Safety Statements
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.
IMPIEGO
QUALORA QUESTO STRUMENTO VENISSE UTILIZZATO IN MODO
DIVERSO DA COME SPECIFICATO DAL PRODUTTORE LA
PROZIONE DI SICUREZZA POTREBBE VENIRNE COMPROMESSA.

Safety Precautions
iv
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.
SERVICIO
LAS INSTRUCCIONES DE SERVICIO SON PARA USO EXCLUSIVO
DEL PERSONAL DE SERVICIO CAPACITADO. PARA EVITAR EL
PELIGRO DE DESCARGAS ELÉCTRICAS, NO REALICE NINGÚN
SERVICIO A MENOS QUE ESTÉ CAPACITADO PARA HACERIO.
WARTUNG
ANWEISUNGEN FÜR DIE WARTUNG DES GERÄTES GELTEN NUR
FÜR GESCHULTES FACHPERSONAL.
ZUR VERMEIDUNG GEFÄHRLICHE, ELEKTRISCHE SCHOCKS, SIND
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.

Termaline® Coaxial Load Resistor
v
About This Manual
This manual covers the operating and maintenance instructions for the
following models:
Changes to this Manual
We have made every effort to ensure this manual is accurate. If you discover
any errors, or if you have suggestions for improving this manual, please send
your comments to our Solon, Ohio factory. This manual may be periodically
updated. When inquiring about updates to this manual refer to the part number
and revision on the title page.
Chapter Layout
Introduction — Describes the features of the load resistor, lists equipment
supplied and optional equipment, and provides power-up instructions.
Theory of Operation — Describes how the load resistor works.
Installation — Describes the power supply and load connection instructions.
Operating Instructions — Describes the base level operation instructions.
Maintenance — Lists routine maintenance tasks as well as troubleshooting
for common problems. Specifications and parts information are also included.
8141 8141-010

vi
Table of Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Warning Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
Caution Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Safety Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Changes to this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Chapter Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Chapter 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Purpose And Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Performance Characteristics and Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . 1
Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Power and Utility Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Items Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Items Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Tools and Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 2 Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 4 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Emergency Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Termaline® Coaxial Load Resistor
vii
Chapter 5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Outside Surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RF Assembly Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DC Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RF Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Coolant Oil & Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RF Load Resistor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
RF Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Coolant Oil & Diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
RF Load Resistor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Available QC Type Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1
Chapter 1 Introduction
General
This instruction book is intended for use by operators of the Models 8141 and
8141-010 Termaline Load Resistor. This chapter contains introductory
information including product specifications; items supplied; and accessory
items.
Purpose And Function
The Models 8141 and 8141-010 Termaline Load Resistor are portable, general
purpose 50 ohm coaxial transmission line terminations. They are self-contained
units requiring no outside power source or additional equipment. They provide
accurate, dependable, and practically non-reflective terminations for testing
and adjusting transmitters under non-radiating conditions from DC to 2500
MHz.
The models are rectangular in shape with transverse cooling fins spaced evenly
along its entire length. Their short length makes it particularly useful in
locations. Also, the ten pounds total weight is a convenience in portable use.
Mounting holes are provided, see Chapter 3, Installation.
The RF connector, on the front face of the unit, is a Female N similar to UG-58A/
U, but is a “Quick-Change” design permitting rapid and easy interchange with
other AN type connectors.
Performance Characteristics and Capabilities
The loads will absorb and dissipate as heat up to 250W of RF power in
continuous duty. It can handle up to 20 percent overload for a maximum of ten
minutes overload without damage, provided a half-hour interval is maintained
for cooling between power applications. The design of the resistor and its
impedance matching shell keeps the VSWR below 1.1 to 1.0 from DC to 1000
MHz, 1.2 to 1.0 from 1000 to 1800 MHz and 1.3 to 1.0 from 1800 to 2500 MHz.
With its .QC. type of connector Model 8141 can be adapted to coaxial cables
equipped with any of a variety of standard connectors.
Dimensions and Weight
Consult the Specification Sheet for the size and weight of each load.

Termaline® Coaxial Load Resistor
2
Power and Utility Requirements
Other than the RF power input the Models 8141 and 8141-010 has no need for
an external source of power or utility services.
Environmental Requirements
The loads should be operated in as clean and vibration free an environment as
possible. The ambient temperature range should remain within -40°C to +45°C
(-40°F to +113°F) for proper operation.
Items Supplied
The models are a self-contained unit, there are no additional parts other than
this instruction book supplied. The load is prefilled at the factory with the
proper amount of coolant.
Items Required
No additional items are required other than a coaxial cable for connecting the
RF source to the load. The load is furnished with a Female N type connector. The
cable should be equipped with a Male N type plug. If the cable has any other
type of standard connector, then the load should be ordered with the
appropriate type of mating connector.
Tools and Test Equipment
Only a screwdriver is needed for disassembling for service. An ohmmeter or
resistance bridge with an accuracy of one percent or better at 50 ohms, is useful
for checking resistor condition.

3
Chapter 2 Theory of Operation
General
The Models 8141 and 8141-010 Termaline Load Resistor consists essentially of a
cylindrical film type resistor immersed in a dielectric coolant. The resistor,
individually selected for its accuracy, is enclosed in a special tapered housing
which provides a linear reduction in surge impedance directly proportional to
the distance along the resistor. This produces the uniform, practically
reflectionless line termination over the stated frequencies of the load.
The dielectric coolant is chosen for its desirable electrical properties and
thermal characteristics. Cooling of the load is accomplished by natural fluid and
air convection. The 0.35 gallon (1.3 liter) of dielectric coolant carries the
electrically generated heat from the resistor to the walls of the cylindrical
cooling tank. The tank is encased in a set of heavy gauge aluminum radiator fins,
which are firmly pressed on the cylinder. The heat from the dielectric oil is
transferred to the surrounding air through the fins by natural convection.
A synthetic rubber diaphragm located in the rear dome of the load allows for
the expansion of the coolant as the temperature rises.

4
Chapter 3 Installation
General
Position the Model 8141 and 8141-010 Termaline Load Resistor to provide at
least six inches of unobstructed space around and above the unit. Place the load
to permit the shortest possible cable length between the unit and the
transmitting equipment.
Operate the load in a horizontal position only, with the handle on top. The load
may be free-standing or fastened to any convenient flat surface. The front and
rear fins are made extra thick and bent outward 90° to form mounting flanges.
Fasten the Model 8141 by its mounting brackets with 1/4 machine screws and
nuts or No. 12 wood screws if desired. The four 9/32 inch holes in the mounting
brackets form a base rectangle of 7-15/32" x 5-1/8" (189.7 x 130.2 mm) for the
Model 8141 and 7/13/32. x 5/1/8. (180 x 130.2 mm) for the Model 8141-010.

5
Chapter 4 Operating Instructions
Start-up
Connect the Models 8141 and 8141-010 Termaline Load Resistor to the
transmitting equipment under test with 50 ohm coaxial cable such as RG-213/U
or equal, equipped with a Male N type plug (UG-21E/U or equal) which mates
with the RF input connector of the load. After the transmitter has been
connected to the load, proceed according to the transmitter manufacturer.s
instruction.
Due to the difference in VSWR between the dummy load and the transmitter.s
antenna, readjustment of the transmitter may be required when returning to
the original antenna.
The unit will sustain an intermittent input of 300 W maximum for up to ten
minutes with half-hour off intervals between power applications.
Normal Operation
The loads will dissipate 250W of RF power safely and continuously without an
operator in attendance.
As stated previously, the load can be overloaded to 300W of RF power for a
maximum of ten minutes at a time with an interval of at least a half-hour in
between to permit the load to cool off. Because of the additional heat that must
be given off by the cooling fins under these conditions, touch the load with
caution to avoid the possibility of painful burns.
Shutdown
The only way to turn off the equipment is to cut off power from the RF
generator. Allow sufficient time for the load to cool down after removing RF
power before handling it.
CAUTION
Do not operate this equipment over the rated 250 watts continuously.
Damage to the resistive element will result.

Termaline® Coaxial Load Resistor
6
Emergency Shutdown
Turn off the equipment by removing power from the RF generator.
WARNING
Never attempt to disconnect RF equipment from the transmission line while
RF power is being applied. Leaking RF energy is a potential health hazard.

7
Chapter 5 Maintenance
Troubleshooting
For corrections requiring repair or replacement of components, refer to the
appropriate section for each specific model.
.
PROBLEM POSSIBLE CAUSE REMEDY
Coolant oil leak around
clamping band or radiator.
Clamping bands not tight. Tighten slightly with
screwdriver.
Faulty O-Ring (front). Replace O-ring
Faulty diaphragm (rear). Replace diaphragm
Overheating of the
radiator.
Transmitter power too
high.
Reduce transmitter
power.
Coolant oil level too low.
Add more coolant oil to
the radiator, see
"Coolant Oil &
Diaphragm" on page 9
Accumulation of dirt on
cooling fins. Clean cooling fins.
Faulty RF section
assembly, check RDC. Replace if needed.
High and low DC
resistance values.
Loose or faulty RF
connector.
Tighten or replace as
needed.
Faulty RF section assembly Replace if needed.

Termaline® Coaxial Load Resistor
8
Cleaning
Outside Surface
The outside surface of the instrument, especially the cooling fins, should be
wiped free of dust and dirt when necessary. Clean the RF input connector with a
clean dry cloth. Use an aerosol type non residue forming contact cleaner on the
inaccessible portions. Take special care to clean the metallic contact surfaces
and exposed face of the teflon insulator.
Inspection
With the rugged and simple construction of loads, periodic inspection will be
necessary at only about six month intervals. Inspection should include the items
listed below:
1. Cleanliness - Keep the housing and connector free of grime.
2. Oil Leakage - Check for coolant oil seepage from the radiator tank, and
particularly at the front and rear near the under side of the clamping band.
See "Troubleshooting" on page 7 if leakage is observed. Check tightness of
the clamping screw.
3. Inspect the load for completeness and general condition of the equipment.
Preventive Maintenance
The load requires only nominal routine care. It is designed to operate for long
periods of time, if care is taken not to exceed its power handling capabilities.
The principal item of preventive maintenance is cleanliness. Keep the cooling
fins clear of accumulated dust and grime. They interfere with the efficient and
rapid transfer of heat from the fins to the surrounding air and therefore could
cause the unit to overheat. Keep the coolant level up.
RF Assembly Test
DC Resistance
The electrical condition of the load resistor itself may be ascertained generally from its
DC resistance at room temperature.
It must be remembered that VSWR and RF impedance are the prime requisites
of a good dummy load, however, occasionally checking the DC resistance will
offer an indication of a failing load.

Maintenance
9
Normally the DC resistance of the load will be a nominal 50 ohms. Stabilization
of the resistive film or temperature can cause a change in the DC resistance.
Always check the load, when its temperature is between 20 and 25 degrees
Celsius.
Check and record the DC resistance value of the load before it is put into
service. Use a resistance bridge or ohmmeter with an accuracy of one percent
or better at 50 ohms for this purpose.
If the load is used frequently, daily to weekly, it would be wise to check the
resistance on a monthly schedule. If however, the load is used more
infrequently, set up a six month to yearly schedule accordingly. If there is no
change or even a slight change in DC resistance there is no cause for alarm,
however, if there is a drastic change greater than two ohms, this could be an
indication of a failing load.
These tests are by no means a dire necessity to the operation of the load but
merely guidelines for the users information and advisement.
Disassembly
There are no special techniques required for the repair or replacement of
components. A screwdriver is the only tool needed. The following paragraphs
outline component removal.
RF Input Connector
The input connector is a .Quick-Change. design which permits easy interchange
with the use of only a screwdriver. This process does not interfere with the
essential coaxial continuity of the load resistor.s RF input or the coolant oil seal.
For replacement, proceed as follows:
1. Remove the four 8-32 x 5/16 inch pan head machine screws from the
corners of the RF connector.
2. Pull the connector straight out of its socket.
Coolant Oil & Diaphragm
To examine the coolant oil and diaphragm, remove the diaphragm cover.
Proceed as follows:
1. Stand the load vertically, with the back end up.
2. Loosen the clamp screw to release the clamping band.
3. Remove the diaphragm cover and lift the diaphragm from the back end of
the radiator tank.
Note: The diaphragm should be soft and pliable. If it is hard or
shows signs of surface cracks, replace it. (Bird P/N 2430-015).

Termaline® Coaxial Load Resistor
10
Note: The coolant level should be about one inch below top of the
cylinder. If oil appears contaminated, replace. Use only the speci-
fied coolant, Bird P/N 5-1070.
RF Load Resistor Assembly
1. Stand the radiator vertically with RF input connector up.
2. Loosen the 10-32 clamping screw on the clamp band that holds the RF
section in place with a screwdriver
3. Remove the clamping band.
4. Lift the RF section straight up and out of the radiator tank.
Note: Hold for a short time over tank to allow oil to drain back in.
5. Inspect the O-Ring seal just inside the sloped flange of the mounting ring.
6. Replace the seal, Bird P/N 5-230, if it shows any evidence of cuts or
deterioration such as hardening or surface cracks.
Reassembly
RF Input Connector
To install a new connector, reverse the procedures in "Disassembly" on page 9 .
Note: Ensure that the projecting center contact pin on the con-
nector is carefully engaged and properly seated with the mating
socket of the load resistor input.
Coolant Oil & Diaphragm
Note: Inspect the diaphragm and coolant oil as indicated in disas-
sembly.
1. Put the diaphragm back in place on the radiator tank.
2. Press the cup-like swelling in the center of the diaphragm down into the
tank to remove the trapped air bubble.
3. Pry the diaphragm away from the edge of the tank to allow the air to
escape.
Note: Through the same opening add more oil, if necessary, until
the oil level is flush with the top of the tank.
4. Replace the diaphragm cover and the clamping band.
5. Tighten the clamping screw.

Maintenance
11
RF Load Resistor Assembly
To install assembly, reverse the procedures in "Disassembly" on page 9 .
Repairs
Repairs beyond what is covered in this instruction book will require return of
the equipment to Bird Electronic Corporation for service. Please consult the
factory.
Storage
No special preparation for storage is required other than to cover the
equipment to keep it free of dust and dirt accumulations. Storage in a dry, dust
and vibration free environment is recommended. The storage temperature
should preferably remain within the working temperature range of -40°C to
+45°C (-40°F to +113°F).
Customer Service
Any maintenance or service procedure beyond the scope of those in this
chapter should be referred to a qualified service center.
If the unit needs to be returned for any reason, request an Return Material
Authorization (RMA) through the Bird Technologies website. All instruments
returned must be shipped prepaid and to the attention of the RMA number.
Bird Service Center
30303 Aurora Road
Cleveland (Solon), Ohio 44139-2794
Fax: [phone]
E-mail: [e-mail]
For the location of the Sales Office nearest you, visit our Web site at:
http://www.birdrf.com
WARNING
This product contains substrate made of beryllium oxide. This is a potentially
toxic ceramic and may be harmful to health. Beryllia oxide must be disposed
of in accordance with the legal statutes dealing with hazardous material.
Do not attempt to repair this unit, but return to BIRD ELECTRONIC
CORPORATION.

Termaline® Coaxial Load Resistor
12
Shipment
Wrap and secure the RF connector with tape to keep out foreign material during
shipment. Pack and brace the load in a shipping container, a corrugated paper
container should suffice.
Specifications
Replacement Parts List
Impedance 50 ohms nominal
VSWR
1.1:1.0 maximum DC-1000 MHz
1.2:1.0 maximum 1000-1800 MHz
1.3:1.0 maximum 1800-2500 MHz
Connectors Female N “QC” type (normally supplied)
Power Range 250 W continuous
Frequency Range DC-2500 MHz
Dimensions 9-9/16"L x 5-5/16"W x 8-1/2"H
(243 x 151 x 216 mm)
Ambient Temperature -40C to +45C (-40F to +113F)
Cooling Method Dielectric liquid & air convection
Weight, Nominal 10 lb (4.5 kg)
Operating Position Horizontal only
Finish Grey Powder Coat Paint
Item Qty Description Part Number
1 1 Radiator assembly 2440-015
2 1 RF section assembly 8141-002
31Coolant .35 gallons
(1.3 liter)(1 gallon container) 5-1070-2
4 1 “QC” connector See Table Below.
5 2 Clamp band assembly 2430-055
6 1 O-Ring seal 5-230
7 1 Diaphragm 2430-015
8 1 Diaphragm cover 2430-148