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19. Second Converter Adjustments
Procedure
Second LO Frequency
and Shift Adjustments
Note
Note
1. Remove A23 RF Converter assembly from HP 8568B Spectrum
Analyzer. Removal and installation procedures are contained as
a repair procedure in the RF Section of the Troubleshooting and
Repair Manual, Volume 1.
2. Position instrument on right side as shown in Figure 3-72 with the
RF Converter removed but with cables still connected.
3. Set HP 8568B Spectrum Analyzer LINE to ON and press
The second LO and pilot second LO output power is typically -35
amplify the LO power to a useable level for the counter and power
meter.
The following adjustment tools are required to adjust the
second converter: allen driver (08555-20121) and hex nut driver
(08555-20122). Place the allen driver through the center hole of the
hex nut driver. Loosen the adjustment nut using the hex nut driver
while adjusting the bandpass with the allen driver. Do not over
tighten the nut on the second converter.
4. Connect the amplifier's input to A23A3J3 and the power meter to
the amplifier's output.
5. Adjust A23A3 2ND MIXER A23A3Z4 for maximum power meter
indication. See Figure 3-73 for location of adjustment.
Figure 3-73. Location of Second Converter Adjustments
6. Disconnect power meter and connect frequency counter to
amplifier's output.
7. Adjust A23A3 2ND LO FREQ A23A3Z9 for frequency counter
indication of 1748.6 MHz fl.O MHz. See Figure 3-73 for location
of adjustment.
8. Disconnect frequency counter and reconnect power meter to
amplifier's output.
2 0 5 2 5 MHz
Ml
XER
2 0 1 7 . 6 MHz
P I L O T 2ND I F B P F
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