DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
RADIO TEST SET, IFR SYSTEMS INC.,
MODELS 2947 AND 2947A AND
MARCONI, MODEL 2947
Headquarters, Department of the Army, Washington, DC
4 February 2013
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 ....................................................
Frequency................................................................
Output level ............................................................
Residual FM and AM .............................................
Harmonics and spurious signals ...........................
Single sideband phase noise ..................................
Amplitude modulation............................................
Frequency modulation............................................
Audio voltmeter ......................................................
Audio generator output level .................................
Audio generator distortion .....................................
Audio frequency meter ...........................................
_________
*This bulletin supersedes TB 9-6625-152-24, dated 28 November 2012.