5-42
Alignment
Moseley PCL 6000 Document No. 602-13375-01 Rev.B
PRESELECTOR FILTER (1.7 GHZ)
The filter is located at the rear of the receiver (see system assembly drawing) and has a
passband of approximately 20 MHz. Under normal circumstances, no alignment is required. To
check alignment, a sweep oscillator, whose frequency is centered in the middle of the RF band
used, is injected into RF IN and the signal is monitored at IF OUT. The five screw adjustments
should be set for a flat passband greater than 5 MHz wide. Take care not to adjust the LO filter
which is located on the same bracket. The preselector filter is the one that is connected directly to
the ANTENNA port.
1ST LOCAL OSCILLATOR (950 MHZ)
The adjustments for the receiver 1st LO are identical to those specified for the transmitter 1st LO
(see Section 5.4.2).
1ST LOCAL OSCILLATOR (330/450 MHZ)
The adjustments for the receiver 1st LO are identical to those specified for the transmitter 1st LO
(see Section 5.4.2).
LO2 SYNTHESIZER
REF FREQ ADJ (OSC1)
Frequency Trim Adjustment. Used to tune the reference oscillator.
LOSS OF LOCK (CR1)
This LED gives a red indication when the AFC loses lock.
AFC LVL (FL1)
AFC level test point. Monitors the DC level of the AFC loop. It is
normally set to +7 VDC.
F1 AFC ADJ (C34)
F1 AFC Level Adjustment. Adjusted for a nominal 5–9 VDC
depending on the channel assignment. Check the test data sheet.
F1 “ON” (S4-2)
Switches on the F1 AFC adjustment capacitor (active).
F1 LED (CR6)
Indicates the F1 AFC adjustment capacitor is active.
F2 AFC ADJ (C30)
F2 AFC Level Adjustment. Adjusted for a nominal 5–9 VDC
depending on the channel assignment. Check the test data sheet.
F2 “ON” (S4-3)
Switches on the F2 AFC adjustment capacitor (active).
F2 LED (CR5)
Indicates the F2 AFC adjustment capacitor is active.
FIX “ON” (S4-4)
Switches on the FIX AFC adjustment capacitor (active).
LO2 LVL (TP2)
LO2 level test point. A DC level (+0.9 VDC) that represents the
detected relative output of the FMO oscillator.
FREQUENCY SELECTOR SWITCHES
S4-1
Programs the 64 MHz step size of the synthesizer.
S1
Programs the 4 MHz step size of the synthesizer.
S2
Programs the 250 kHz step size of the synthesizer.
S3
Programs the 25 kHz step size of the synthesizer.
5.4.7
IF Demod (PCL6020)
1ST 10.7 MHz IF ADJ (C13)
IF Adjustment. Adjust for minimum distortion.
2ND 10.7 MHz IF ADJ (C18)
IF Adjustment. Adjust for minimum distortion.
Summary of Contents for PCL-600
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Page 64: ...3 10 Operation Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 86: ...4 22 Module Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
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Page 138: ...6 4 Customer Service Moseley PCL 6000 Document No 602 13375 01 Rev B...
