ATTEN 1 0 d B

 

R L O d B m

10dB,’

BIRoKEN JSYMME~~TRY 1

C E N T E R 300.0000MHz

 

S P A N

1 0 0 0kHz

*RBW 3.0kHz

V B W 3.0kHr

S W P

7 0 m s

S K 1 8 4

Figure 8-15. Faulty Crystal Symmetry

Step Gains

Refer to function blocks B, H, and I of A5 IF Filter Schematic Diagram (sheets 1 of 3 and

2 of 3) in the HP 856OA/61B/63A Spectrum Analyzer Component Level Information binder.

I. On the spectrum analyzer, press (-1, (SPAN), ZERO SPAN , (w), 1 IGHz).

2.Press (CAL), IF ADJ OFF.

3.Disconnect W29 (coax 7) from A5J3 and W27 (coax 3) from A5J5.

4.Inject a -5 dBm, 10.7 MHz signal into A5J3.

5.Monitor the output of A5J5 with another spectrum analyzer.

6.Simultaneously decrease the signal generator output and spectrum analyzer reference level in 10 dB steps.

7.At each step, the signal displayed on the other spectrum analyzer should be close to +lO dBm. (More subtle IF gain problems might require smaller signal generator and reference level steps.)

8.Reconnect W29 to A5J3 and W27 (coax 3) to A5J5.

IF Section 8-33