Section V
TM 11-6625-2781-14&P-2
ADJUSTMENT PROCEDURES (cont' )
d
5-29. APC Search Oscillator Checks
REFERENCE: Service Sheet 6.
DESCRIPTION: The first local oscillator signal is disconnected from the APC input at A6C1. The search oscillator
output is monitored while varying the test conditions to verify the search oscillator operation.
Figure 5-13. APC Search Oscillator Check Test Setup.
EQUIPMENT:
Oscilloscope ................................ ................................ ................................ ......................... HP 180A/1801A/1821A
Cable Assembly (with test clips added) ................................ ................................ ................................ ... HP 10501A
Extender Cable Assembly ................................ ................................ ................................ ............... HP 11592-60015
Interconnecting Cable Assembly ................................ ................................ ................................ ..... HP 11592-60016
1. Connect the test setup in Figure 5-13 and make the following control settings:
ANALYZER:
RANGE MHz ................................ ................................ ................................ ................................ ................... 0-110
TUNING STABILIZER................................ ................................ ................................ ................................ .......... ON
A6 APC SEARCH ................................ ................................ ................................ ................................ ...... NORMAL
SCAN WIDTH ................................ ................................ ................................ ................................ ....PER DIVISION
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ....................... 20 kHz
180A/1801A/1821A:
HORIZONTAL SCALE ................................ ................................ ................................ .............................. 20 ms/DIV
VERTICAL SCALE................................ ................................ ................................ ............................ 0 5 VOLTS/DIV
VERTICAL COUPLING................................ ................................ ................................ ................................ ........ AC
5-20
