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ALTRONIC RESEARCH, INC.

ALTRONIC RESEARCH, INC.
P.O. BOX 249
YELLVILLE, ARKANSAS 72687-0249
U.S.A.



MODEL 7775
COAXIAL LOAD RESISTOR



















7775/Rev Feb.2005

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Altronic Research Inc.










MODEL 7775
75KW AIR COOLED COAXIAL RESISTOR









7775/Rev Feb.2005

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Altronic Research Inc.

LIMITED WARRANTY


We take pride in manufacturing products of the highest quality and we warrant
them to the original purchaser to be free from defects in material and workmanship
for the period of one year from date of invoice. Additionally, products of our
manufacture repaired by us are warranted against defects in material and
workmanship for a period of 90 days from date of invoice, with the provisions
described herein.

Should a product, or a portion of a product of our manufacture prove faulty, in
material or workmanship, during the life of this warranty, we hereby obligate
ourselves, at our own discretion, to repair or replace such portions of the product as
required to remedy such defect. If, in our judgment, such repair or replacement
fails to be a satisfactory solution, our limit of obligation shall be no more than full
refund of the purchase price.

This warranty is limited to products of our own manufacture. Equipment and
components originating from other manufacturers are warranted only to the limits
of that manufacturer's warranty to us. Furthermore, we shall not be liable for any
injury, loss or damage, direct or consequential, arising out of the use, or misuse (by
operation above rated capacities, repairs not made by us, or any misapplication) of
the equipment. Before using, the user shall determine the suitability of the product
for the intended use; and the user assumes all risk and liability whatsoever in
connection therewith.

The foregoing is the only warranty of Altronic Research Incorporated and is in lieu
of all other warranties expressed or implied.

Warranty returns shall first be authorized by the Customer Service Department
and shall be shipped prepaid. Warranty does not cover freight charges.








7775/Rev Feb.2005

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Altronic Research Inc.

TABLE OF CONTENTS
MODEL 7775

SECTION







PAGE

Warranty ...............................................................................................3
Precautions ........................................................................................6,7
Introduction ..........................................................................................8

I.
Description and Leading Particulars


1-1 Purpose and Application of Equipment ..........................8


1-2 Equipment Supplied ........................................................8


1-3 Equipment Required But Not Supplied ..........................8


1-4 General Description .........................................................9


1-5 Electrical Description.......................................................9


1-6 Mechanical Description....................................................9


1-7 General Principle of Operation........................................9


1-8 Operating and Adjustment Controls .............................10


1-9 Operator Training ..........................................................10

II. Test Equipment and Special Tools


2-1 Test Equipment Required..............................................11


2-2 Special Tools Required...................................................11


2-3 Materials Required ........................................................11

III. Preparation for Use and Reshipment


3-1 Unpacking Equipment ...................................................12


3-2 Pre-Installation Inspection ............................................12


3-3 Pre-installation Test ......................................................12


3-4 Installation .....................................................................12


3-5 Location ..........................................................................12


3-6 Mounting ........................................................................13


3-7 Connections ....................................................................13


3-8 Adjustments ...................................................................13


3-9 RF Auto Ground .............................................................14


IV. Theory of Operation


4-1 General ...........................................................................15


4-2 Control Circuits..............................................................15



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Altronic Research Inc.

SECTION







PAGE


V. Maintenance


5-1 Cleaning..........................................................................17


5-2 Lubrication .....................................................................17


5-3 RF Circuit (including resistor replacement) .................18

VI. Diagrams


6-1 Outline and Dimensions ................................................19


6-2 Schematic Diagram ........................................................20


6-3 Parts List ........................................................................21

VII. Specifications ..............................................................................22

APPENDIX

Corrosion Prevention Manual

Manufacturers Documents






















7775/Rev Feb.2005

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Altronic Research Inc.

PRECAUTIONS


WARNING

This equipment can start automatically. Do not
attempt any service or parts replacement without
first disconnecting all AC power and RF power.
Failure to do so may result in serious or fatal
electrical shock.



CAUTION
Do not block air grills or restrict airflow when ducting
inlet and discharge air. Restrictions in airflow limit the
loads ability to dissipate RF power and could damage
and/or cause the unit to fail.




CAUTION

Do not connect the unit to an RF power source without
first ensuring that the load is connected to the proper
line voltage and that the interlock circuit is properly
attached to the transmitter. The interlock circuit is
designed to indicate a fault and prevent operation when
line voltage is not present. Do not apply more than rated
power to unit. Damage will occur before thermal
protectors can activate interlock circuit.


CAUTION

When using any cleaning solvents or solutions, assure
that there is adequate ventilation to protect personnel
from breathing any irritable or possibly toxic fumes.


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Altronic Research Inc.


OPERATING TEMPERATURE
WARNING



CARE SHOULD BE TAKEN TO OPERATE UNIT BELOW
STATED MAXIMUM AMBIENT OPERATING TEMPERATURE.



OPERATION ABOVE RATED AMBIENT
TEMPERATURE MAY CAUSE MOTOR
THERMAL PROTECTION TO SHUT OFF FAN,
WHICH MAY CAUSE DAMAGE TO UNIT.


PROVISIONS ARE MADE TO TRIP THE INTERLOCK
IN THE EVENT OF OVERHEAT, BUT THE INTERLOCK
MUST BE PROPERLY CONNECTED TO THE RF SOURCE
FOR THIS FUNCTION TO OPERATE.


NEVER OPERATE WITH INTERLOCK
BYPASSED OR MALFUNCTIONING.
TO DO SO WILL VOID THE WARRANTY.












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Altronic Research Inc.

INTRODUCTION

This handbook was prepared for technical personnel as an aid in understanding and
performing installation, service and maintenance procedures for the
OMEGALINE®
Model 7775 Air-Cooled Coaxial Load. Personnel are considered to be skilled if they
have the necessary knowledge and practical experience of electrical and radio
engineering to appreciate the various hazards that can arise from working on radio
transmitters, and to take appropriate precautions to ensure the safety of personnel.



SECTION I

DESCRIPTION AND LEADING PARTICULARS


1-1. Purpose and Application of Equipment. The OMEGALINE® Model 7775
Coaxial Load is designed to safely dissipate a maximum of 75,000 watts of
electrical energy over a frequency range of 540 to 1750 KHz.

1-2. Equipment Supplied. The Model 7775 Coaxial Load is supplied with
standard RF connectors. Their designations are:

3-1/8" EIA Swivel flange: Model # 7775E3
3-1/8" Unflanged flush:
Model # 7775F3
3-1/8" Unflanged recessed: Model # 7775R3


The standard power supply voltages and their designators after the Model #
are:

-115: 110-120VAC, single phase, 50/60 Hz
-230: 208-230VAC, single phase, 60 Hz
-230: 208-230VAC, three phase, 50/60 Hz


1-3. Equipment Required But Not Supplied. The Model 7775 Coaxial Load is
complete as supplied, but the user must furnish RF input, power input,
interlock control cable, alarm circuit control cable, transmitter emergency
stop cable, and ground cable appropriate to each in