150 MHz Oscillator Adjustment

Section V

TM 11-6625-2781-14&P-2

ADJUSTMENT PROCEDURES (cont' )

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