DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
RADIO TEST SET AN/GRM-114B,
AN/GRM-122 AND TS-4317/GRM
Headquarters, Department of the Army, Washington, DC
14 April 2014
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 or DA Form 2028 (Recommended Changes to
Publications and Blank Forms) directly to: Commander, U.S. Army Aviation and Missile Command,
ATTN: AMSAM-MSS-LP, Redstone Arsenal, AL 35898-5000. A reply will be furnished to you.
You may also send in your comments electronically to our E-mail address:
2028@redstone.army.mil or by fax 256-842-6546/DSN 788-6546. For the World Wide Web use:
https://amcom2028.redstone.army.mil. Instructions for sending an electronic 2028 can be found at
the back of this manual.
Paragraph
Page
IDENTIFICATION AND DESCRIPTION
Test instrument identification..............................
Forms, records, and reports ..................................
Calibration description..........................................
EQUIPMENT REQUIREMENTS
Equipment required ..............................................
Accessories required ..............................................
CALIBRATION PROCESS
Preliminary instructions .......................................
Equipment setup ...................................................
AF generator frequency.........................................
AF generator output level .....................................
Distortion meter ....................................................
SINAD meter .........................................................
Digital multimeter.................................................
Generator output level ..........................................
Generator spectral purity .....................................
Generator residuals ...............................................
Generator frequency ..............................................
Oscilloscope ............................................................
Spectrum analyzer.................................................
Power meter calibration ........................................
Generator amplitude modulation .........................
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*This bulletin supersedes TB 9-6625-2296-24, dated 1 May 2013.