HP 8568B 19. Second Converter Adjustments, Figure 3-74.Typical PILOT 2ND IF Bandpass (SHIFT t), Figure 3-75.Typical PILOT 2ND IF Bandpass (SHIFT 1)

19. Second Converter Adjustments

Figure 3-74. Typical PILOT 2ND IF Bandpass (SHIFT t)Figure 3-75. Typical PILOT 2ND IF Bandpass (SHIFT 1)

42.Key in [*] 0) u and note amplitude of signal. Key in ISHIFT) @a T and note amplitude of the bandpass signal peak.

43.Continue to key in [SHIFT] 0) u then a T while adjusting

A23A3Z8 for maximum amplitude and the same amplitude in both states of the Second LO • tcO.25 dB.

44.Check the bandpass at the 3 dB points for both the 2ND LO 1

and 1. On the scalar network analyzer, press (CURSORJ Max. Press cursor A (ON) and set the cursor at the -3 dB point fO.l dB. Press cursor A, cursor A, and set the cursor to the corresponding -3 dB point on the opposit side of the signal. The cursor should now read 0 fO.l dB.

45.On the synthesized sweeper, press Irvr3) and place the marker on either cursor A. Press (M4), and place the marker on the cursor A on the opposite side of the trace.

46.On the synthesized sweeper, press [Morn), and read the bandpass (M3 - M4) shown on the ENTRY DISPLAY. Press [Morn) OFF. See Figure 3-74 and Figure 3-75.

47.Disconnect the detector from cable 80 (gray/black) and connect cable 92 (white/red) from A23A3J5 (2ND IF) to the scalar network analyzer’s A input.

Adjustments 3-127