Section V
TM 11-6625-2781-14&P-2
ADJUSTMENT PROCEDURES (cont' )
d
5-25. 150 MHz Oscillator Adjustment (cont'd)
ANALYZER Control Settings (cont'd)
FINE TUNE................................ ................................ ................................ ................................ ................. Centered
BANDWIDTH ................................ ................................ ................................ ................................ ................. 10 kHz
SCAN WIDTH ................................ ................................ ................................ ................................ ....PER DIVISION
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ..................... 0 1 MHz
INPUT ATTENUATION................................ ................................ ................................ ................................ .... 10 dB
BASE LINE CLIPPER ................................ ................................ ................................ ................................ ..Max ccw
SCAN TIME PER DIVISION ................................ ................................ ................................ ........ 2 MILLISECONDS
LOG REF LEVEL ................................ ................................ ................................ ................................ ............ 0 dBm
LOG REF LEVEL Vernier................................ ................................ ................................ ................................ ........ 0
VIDEO FILTER ................................ ................................ ................................ ................................ .................. OFF
SCAN MODE ................................ ................................ ................................ ................................ ....................... INT
SCAN TRIGGER ................................ ................................ ................................ ................................ ............ AUTO
LOG/LINEAR ................................ ................................ ................................ ................................ ..................... LOG
8405A:
FREQUENCY RANGE - MHz ................................ ................................ ................................ ....................... 100-200
CHANNEL ................................ ................................ ................................ ................................ .............................. A
AMPLITUDE RANGE................................ ................................ ................................ ................................ .... 300 mV
5245L/5252A:
SAMPLE RATE................................ ................................ ................................ ................................ ............ 8 o'clock
SENSITIVITY................................ ................................ ................................ ................................ .............. PLUG IN
TIME BASE ................................ ................................ ................................ ................................ ..................... 10 ms
FUNCTION ................................ ................................ ................................ ................................ ......... FREQUENCY
MAX COUNT RATE................................ ................................ ................................ ................................ ...... 200 MC
2. Tune FREQUENCY to center local oscillator feedthrough signal on the analyzer display.
3. Use a nonmetallic tuning tool to tune A10A1L3. See component location illustration in Section VIII for the
location of A10A1L3 (top of 8553B).
4. Turn A10A1L3 counterclockwise until the local oscillator feedthrough signal no longer appears on the display.
CAUTION
Excess turning pressure may damage the tuning slug. Do not attempt to force the slug, or to
turn it any further than necessary.
5. Turn the slug clockwise for a peak amplitude indication on the vector voltmeter.
6. Carefully turn the slug until the oscillator frequency is 150 MHz 10 kHz, as indicated on the frequency counter.
149.990 ___________150.010 MHz
Oscillator output amplitude should be between 150 and 250 mV rms into a 50-ohm load. The 11536A Probe Tee
and 10 dB pad provides a 50-ohm termination.
150 ________250 mV rms.
5-13
