450 Chapter9
IF Section
Log Amplifier (P/O A4 Assembly)
10.7 MHz IF Filters
1. Press PRESET, FREQUENCY, 300 MHz, SPAN, 600 Hz, CAL, and IF ADJ
OFF.
2. Disconnect W29 (coax 7) from A5J3. Set the signal generator for a
10.7 MHz signal at −50 dBm and connect it to A5J3.
3. Fine tune the frequency of the signal generator to center the signal
on the 8564EC or 8565EC spectrum analyzer display. Set the
signal generator to sweep one 2 kHz span about this center
frequency.
4.On the 8564EC or 8565EC spectrum analyzer, press
SGL SWP.
5. Disconnect W27 (coax 3) from A5J5. Connect a test cable from A5J5
to the input of an 8566A/B.
6. Set the 8566A/B as follows:
Center frequency .................................................... 10.7MHz
Span .............................................................................. 2kHz
Reference level ......................................................... +10dBm
Sweep ............................................................................Single
7. Press TRACE A
CLEAR-WRITE on the 8566A/B.
8. Trigger a sweep on the signal generator and on the 8566A/B
simultaneously. The 8566A/B should display a 3 dB bandwidth of
approximately 500 Hz.
9. Reconnect W27 (coax 3) to A5J5 and W29 (coax 7) to A5J3.
4.8 kHz and 10.7 MHz IF Filters
1.On the 8564EC or 8565EC spectrum analyzer, pressPRESET,
FREQUENCY, 300 MHz, SPAN, 600 Hz, CAL, and IF ADJ OFF.
2. Disconnect W29 (coax 7) from A5J3. Set the signal generator for a
10.7 MHz signal at −60 dBm and connect it to A5J3.
3. Fine tune the frequency of the signal generator to center the signal
on the 8564EC or 8565EC spectrum analyzer display. Set the
signal generator to sweep one 2 kHz span about this center
frequency.
4.On the 8564EC or 8565EC spectrum analyzer, press
SGL SWP.
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