BIRD TERMLINE 8141 User manual
INSTRUCTION BOOK
OPERATING INSTRUCTIONS
TERMLINE®LOAD RESISTOR
MODELS 8141 & 8141-010
©Copyright 1998 by Bird Electronic Corporation
Instruction Book Part Number 920-8141 Rev. D
Termaline®is a Registered Trademark
of Bird Electronic Corporation
Electronic Corporation
Cleveland (Solon) Ohio US
A
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.
Keep Away From Live Circuits
Operating personnel must at all times observe general safety precautions. Do
not replace components inside equipment with the high voltage supply
turned on. To avoid casualties, always remove power.
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 who
is capable of rendering aid.
Safety Earth Gound
An uninterruptible earth 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.
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.
Resuscitation
Personnel working with or near high voltages should be familiar with modern
methods of resuscitation.
i
Safety Symbols
WARNING
Warning notes call attention to a procedure, which if not performed
correctly, could result in personal injury.
CAUTION
Caution notes call attention to procedure, which if not performed
correctly, could result in damage to the equipment.
This symbol appears on the equipment indicating there is important informa-
tion in the instruction manual regarding that particular area.
+NOTE: Calls attention to supplemental information.
Warning Statements
The following safety warnings appear in the text where there is danger to op-
erating and maintenance personnel, and are repeated here for emphasis.
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 a resistor substrate made of beryllium oxide.
This is a potentially toxic ceramic and may be harmful to your 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.
ii
Caution Statements
The following equipment cautions appear in the text whenever the equipment
is in danger of damage and are repeated here for emphasis.
CAUTION
Do not operate this equipment over the rated 250 watts continuously.
Damage to the resistive element will result.
Safety Statements
USAGE
ANY USE OF THIS INSTRUMENT IN A MANNER NOT
SPECIFIED BY THE MANUFACTURER MAY IMPAIR
THE INSTRUMENT’S SAFETY PROTECTION.
iii
SERVICE
SERVICING INSTRUCTIONS ARE FOR USE BY SERV-
ICE - TRAINED PERSONNEL ONLY. TO AVOID DAN-
GEROUS ELECTRIC SHOCK, DO NOT PERFORM ANY
SERVICING UNLESS QUALIFIED TO DO SO.
iv
About This Manual
This instruction book covers the models 8141 and 8141-010 Termaline Load
Resistor.
This instruction book is arranged so that essential information on safety is
contained in the front of the book. Reading the Safety Precautions Section be-
fore operating the equipment is strongly advised.
The remainder of this Instruction Book is divided into Chapters and Sections.
At the beginning of each chapter, a general overview describes the contents of
that chapter.
Operation
First time operators should read Chapter 1 - Introduction, and Chapter 3 -
Installation, to get an overview of equipment capabilities and how to install
it. An experienced operator can refer to Chapter 4 - Operating Instructions.
All instructions necessary to operate the equipment, are contained in this
section.
Maintenance
All personnel should be familiar with preventative maintenance found in
Chapter 5 - Maintenance. If a failure should occur, the troubleshooting sec-
tion will aid in isolating and repairing the failures.
Parts
For location of major assemblies or parts, refer to the parts lists and associ-
ated drawings in Chapter 5.
Changes To This Manual
We have made every effort to ensure this manual is accurate at the time of
publication. If you should discover any errors or if you have suggestions for
improving this manual, please send your comments to our factory. This man-
ual may be periodically updated, when inquiring about updates to this man-
ual refer to the part number and revision level on the title page.
v
Table Of Contents
Safety Precautions ......................i
Safety Symbols ......................ii
Warning Statements ....................ii
Caution Statements ....................iii
Safety Statements.....................iii
About This Manual ....................v
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
Theory Of Operation .....................3
General .........................3
Installation .........................5
General .........................5
Operating Instructions ....................7
Start-up .........................7
Normal Operation .....................7
vi
Shutdown ........................7
Emergency Shutdown ...................8
Maintenance .........................9
Troubleshooting.........................9
Cleaning............................9
Outside Surface ......................9
Inspection...........................10
Preventive Maintenance.....................10
RF Assembly Test .......................10
DC Resistance ......................10
Disassembly..........................11
RF Input Connector....................11
Coolant Oil & Diaphragm .................11
RF Load Resistor Assembly ................12
Reassembly ..........................12
RF Input Connector....................12
Coolant Oil & Diaphragm .................12
RF Load Resistor Assembly ................13
Repairs ............................13
Customer Service .....................13
Storage .........................14
Shipment ........................14
Replacement Parts List ..................14
vii
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 nonreflective termina-
tions for testing and adjusting transmitters under nonradi-
ating conditions from dc to 2500 MHz.
The models are rectangular in shape with transverse cool-
ing 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 per-
mitting rapid and easy interchange with other AN type con-
nectors.
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 resis-
tor and its impedance matching shell keeps the VSWR be-
low 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 connec-
tors.
Dimensions and
Weight
Consult the Specification Sheet for the size and weight of
each load
1
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 addi-
tional 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 fur-
nished 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 or-
dered 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.
Specifications
Impedance 50 ohms nominal
VSWR
dc-1000 MHz
1000-18000 MHz
1800-2500 MHz
1.1:1 maximum
1.2:1 maximum
1.3:1 maximum
Connectors Bird Quick Change “QC” Female N Normally
supplied.
Power Range 250 W continuous, 300 W intermittent (10
Minutes maximum).
Frequency Range dc to 2500 MHz
Dimensions 9-9/16”L x 5-15/16”W x 8-1/2”H
(243 x 151 x 216 mm)
Ambient Temperature 40°C to +45°C (-40°F to +113°F)
Weight 10 lb (4.5 kg)
Operating Position Horizontal only
Finish Light grey powder coat
2
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