Equipment information

WRL Electronics SM-90 Other
Manufacturer
WRL Electronics
Model SM-90
Date 1957
Category: Radio, Communication
Group Other
Description Screen Modulator
Information
                                    1-2. The WRL Model SM-90 Screen modulator is made by WRL
Electronics, Inc. of Council Bluffs, Iowa. The Screen
Modulator is designed specifically for use with the Globe
Chief Transmitter, Model 90; but may also be used with any
other transmitter such as the Heath AT-1, Johnson
Adventurer, Knight 50 Watt Transmitter, etc. using one or
two 807 or 616 tubes in the final R.F. amplifier, with
suitable modifications. The Screen Modulator permits
radio-telephone operation of a C.W. transmitter at minimum cost.

1-3. DESCRIPTION.

1-4. The Model SM-90 Screen Modulator is completely
self-contained in a chassis, with the tubes and interstage
transformer projecting above the chassis. An octal plug
projects from the chassis and plugs into the auxiliary
socket on the rear of the Model 90 Globe Chief transmitter,
providing all interconnections between the two units and
mounting the Screen Modulator on the Globe Chief. 

These manuals are available for the above equipment:

WRL Electronics -- SM-90 -- Service and User Manual
File name WRL-6168-Manual-Page-1-Picture
Manual Type Service and User Manual
Pages 16
Size 1.31 Mbytes (1373898 Bytes)
Language english
Revision
Manual-ID/Number
Date May 1957
Quality Scanned document, all readable.
Upload date
MD5 2489b36349691e0e20dc664d3d361b18
Downloads 144 since 06 July 2014
Information
SECTION I. General Description of the WRL Screen Modulator,
Model SM-90.........................1

SECTION II. Parts Mounting and Wiring Procedure
.................................................1

SECTION III. Transmitter
Modifications..........................................................5

SECTION IV. Tune-Up
Procedure...................................................................7

SECTION V. Trouble
Shooting.....................................................................8

SECTION VI. HELPFUL KIT BUILDING INFORMATION
...................................................9

SECTION VII. Parts
List...........................................................................13
WRL-6168-Manual-Page-1-Picture
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