Section V
TM 11-6625-2781-14&P-2
ADJUSTMENT PROCEDURES (cont' )
d
5-30. APC 100 kHz Rejection Adjustment (cont'd)
EQUIPMENT:
Wave Analyzer ................................ ................................ ................................ ................................ ........... HP 310A
Straight-through Voltage Probe ................................ ................................ ................................ ............... HP 10025A
Extender Cable Assembly ................................ ................................ ................................ ............... HP 11592-60015
Interconnecting Cable Assembly ................................ ................................ ................................ ..... HP 11592-60016
ANALYZER:
RANGE MHz ................................ ................................ ................................ ................................ ................... 0-110
FREQUENCY ................................ ................................ ................................ ................................ ................. 0 MHz
BANDWIDTH ................................ ................................ ................................ ................................ ...................... kHz
SCAN WIDTH ................................ ................................ ................................ ................................ ....PER DIVISION
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ....................... 20 kHz
INPUT ATTENUATION................................ ................................ ................................ ................................ .... 10 dB
SCAN TIME PER DIVISION ................................ ................................ ................................ ................. 5 SECONDS
LOG REF LEVEL ................................ ................................ ................................ ................................ ......... -30 dBm
LOG/LINEAR ................................ ................................ ................................ ................................ ..................... LOG
VIDEO FILTER ................................ ................................ ................................ ................................ .............. 100 Hz
SCAN MODE ................................ ................................ ................................ ................................ ....................... INT
SCAN TRIGGER ................................ ................................ ................................ ................................ ............ AUTO
A6 APC SEARCH ................................ ................................ ................................ ................................ ...... NORMAL
TUNING STABILIZER................................ ................................ ................................ ................................ ...........On
2. Adjust FINE TUNE to set the L.O. feedthrough signal on the -3 graticule line.
3. Check for a 100 kHz residual signal at the +2 graticule line.
4. If the 100 kHz residual signal is > -100 dBm, then connect the test setup shown in Figure 5-14, and make the
following control settings:
310A:
BANDWIDTH ................................ ................................ ................................ ................................ ..................... 1000
FREQUENCY (KC) ................................ ................................ ................................ ................................ ............. 100
MAX INPUT VOLTAGE ................................ ................................ ................................ ................................ ........ 03
ABSOLUTE/RELATIVE ................................ ................................ ................................ .......................... ABSOLUTE
MODE................................ ................................ ................................ ................................ ........................ NORMAL
RANGE (DB) ................................ ................................ ................................ ................................ ....................... -40
5. Connect the test lead from the wave analyzer to A6C2. Monitor the amount of 100 kHz signal present.
6. Tune the wave analyzer for maximum 100 kHz signal indication.
7. Adjust A6A1C31, the 100 kHz rejection adjustment, for minimum signal indication on the wave analy zer. See
adjustment location illustrations in Section VIII.
8. Maximum signal at null should be <100 microvolts.
______________100V
5-22
