5-16
Alignment
Moseley PCL 6000 Document No. 602-13375-01 Rev.B
Position the switches on the adjustable attenuator for a reading between 1 k and 3 k
microvolts on the middle scale of the receiver meter.
Using the METER FUNCTION switch on the receiver, select the PGM LVL function. The
meter should read between -1 and +1 dB on the top scale.
Set the frequency to 15 kHz and verify that the meter of the distortion measurement test
set reads between .9 and 1.1 VRMS.
Adjust the METER FUNCTION switch on the distortion measurement test set to the
DISTORTION position.
4.
Using the distortion measurement test set, adjust the following controls on the IF Demod
(PCL6020) or Double Converter/LO3 (PCL6030, PCL6060) for minimum distortion:
PCL6020:
a. 1ST 10.7 MHz IF ADJ
b. 2ND 10.7 MHz IF ADJ
PCL6030/6060:
a. 1ST 10.7 MHz IF ADJ (MONO, WB COMP, NB COMP)
b. 2ND 10.7 MHz IF ADJ (MONO, COMP)
Check the receiver configuration to verify which filter adjustments; MONO (monaural), WB COMP
(wideband composite), or NB COMP (narrowband composite) pertain to your system.
5.
The distortion reading should now be less than 0.2%. Switch the frequency on the
distortion measurement test set to 1.0 kHz. Verify that the distortion reading meets
specifications.
Troubleshooting
1.
The following procedure may be used to determine if the 10.7 MHz filters are a source of
high distortion.
a.
PCL6020: Remove FL1 and FL2 from the IF Demod module and replace it with a
1.0 K ohm resistor. The resistor leads should first be cut between 0.3 and 0.4 inch
from the body. The ends of the resistor leads should then be flattened using a pair
of needle-nose pliers so they can be inserted in the filter sockets. The cover
should then be replaced.
PCL6030/6060: Remove the appropriate ceramic filters FL1 and FL4 (Monaural),
FL2 and FL5 (Wideband Composite), or FL3 and FL5 (Narrowband Composite)
from the Double Converter/LO3 module and replace it with a 1.0 K ohm resistor.
The resistor leads should first be cut between 0.3 and 0.4 inch from the body. The
ends of the resistor leads should then be flattened using a pair of needle-nose
pliers so they can be inserted in the filter sockets. The cover should then be
replaced.
b.
Using the distortion measurement test set, the distortion reading should now be
less than 0.27% at 15 kHz. If it is not, additional troubleshooting will be required
prior to determining the performance of the 10.7 MHz IF filters.
2.
An RF input to the receiver exceeding 6 mV may cause an indication of high distortion.
3.
The distortion of the Audio/Power Supply board in the receiver can be tested
independently by applying the output of the distortion analyzer's audio oscillator to the
baseband input of the Audio/Power Supply board.
Summary of Contents for PCL-600
Page 1: ...User Manual Moseley PCL 6000 Doc 602 13375 01 January 2008...
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Page 30: ...1 18 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Page 32: ...1 20 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
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...
Page 133: ...Moseley PCL6000 5 47 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...
