DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
SIGNAL GENERATOR AN/GRM-50
(SG-479/U) and AN/GRM-50B (SG-479B/U)
Headquarters, Department of the Army, Washington, DC
3 November 2004
Distribution Statement A: Approved for public release; distribution is unlimited.
REPORTING OF ERRORS AND RECOMMENDING IMPROVEMENTS
You can improve this manual. If you find any mistakes or if you know of a way to improve
these procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes
to Publications and Blank Forms), or DA Form 2028-2 directly to: Commander, U.S. Army
Aviation and Missile Command, ATTN: AMSAM-MMC-MA-NP, Redstone Arsenal, AL 35898-
5000. A reply will be furnished to you. You may also provide DA Form 2028 information to
AMCOM via e-mail, fax, or the World Wide Web. Our fax number is DSN 788-6546 or
Commercial 256-842-6546. Our e-mail address is: 2028@redstone.army.mil. Instructions for
sending an electronic 2028 may be found at the back of this manual. For the World Wide Web,
use https://amcom2028.redstone.army.mil.
Paragraph
Page
IDENTIFICATION AND DESCRIPTION
Test instrument identification ............................
Forms, records, and reports.................................
Calibration description ........................................
EQUIPMENT REQUIREMENTS
Equipment required .............................................
Accessories required.............................................
CALIBRATION PROCESS FOR AN/GRM-50
(SG-479/U)
Preliminary instructions......................................
Equipment setup ..................................................
Audio oscillator.....................................................
Crystal calibrator .................................................
Frequency dial accuracy and drift.......................
Carrier zero set.....................................................
Maximum carrier set and modulation zero set ..
Modulation meter accuracy .................................
Modulation output distortion ..............................
RF output, response and attenuator accuracy ...
Power supply ........................................................
Final procedure ....................................................
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*This technical bulletin supersedes TB 9-6625-1999-35, dated 18 July 1986, including all changes.
