Moseley PCL6000
5-33
Moseley PCL 6000 Document No. 602-13375-01 Rev.B
Using the RF spectrum analyzer, position the switches on the adjustable attenuator for an
output level of between -20 and -25 dBM at 70 MHz.
Reconnect the adjustable attenuator to the IF Demod.
5.
Adjust the oscillator output on the distortion measurement test set for a frequency of 1
kHz and a level of 1.25 VRMS (3.5 Vp-p).
6.
Distortion and AFC Level Alignment.
AFC Adjustment
F1 AFC ADJ (C34) is enabled by switch S4-2. When enabled, LED indicator
CR6—visible through the side of the module—will illuminate.
F2 AFC ADJ (C30) is enabled by switch S4-3. When enabled, LED indicator
CR5—visible through the side of the module—will illuminate.
Both adjustments are typically enabled at the same time and tune AFC.
C26 (fixed cap) is enabled by switch S4-4. Enable this switch when operating at
950 MHz or higher.
Using the multimeter, monitor FL1 (AFC Level) and adjust AFC so that the voltmeter
reads +7 VDC.
Using the distortion measurement test set, verify that the baseband output of the IF
Demod is between 1.0 and 1.5 V
RMS
.
Measure the distortion of the output of the IF Demod, and adjust the Varicap Bias
adjustment on the FMO (R37) for a minimum distortion reading.
Note
: Normally there are two setting of the Varicap Bias adjustment that will obtain distortion
minima. Varicap bias should be adjusted to that setting which produces the lowest distortion.
Readjust the AFC so that the voltmeter reads 7 volts.
Repeat this procedure until the varicap bias is set for minimum distortion and the AFC
level adjustment is between 6.9 and 7.1 VDC.
Set the frequency on the distortion measurement test set for 15 kHz and verify that the
distortion meets specifications.
7. Modulation
Level.
The deviation select jumper E7 on the receiver Audio/Power Supply should be in the
wideband composite position.
Using the counter, set the output frequency of the distortion measurement test set
oscillator to 20.78 kHz (16.62 kHz mono). Verify that the oscillator output voltage is 1.25
VRMS (1.00 VRMS mono).
Adjust FMO deviation for ± 50 kHz (± 40 kHz mono) as follows, using the Bessel null
function waveforms in Figure 5-5:
Содержание PCL-600
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Страница 64: ...3 10 Operation Moseley PCL 6000 Document No 602 13375 01 Rev B...
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Страница 138: ...6 4 Customer Service Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 149: ...Moseley PCL6000 7 11 Moseley PCL 6000 Document No 602 13375 01 Rev B 930 03462 01 Rev H Transmitter RF Module Assembly...
Страница 151: ...Moseley PCL6000 7 13 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B3037 Rev B RF Amplifier 220 MHz Assembly...
Страница 153: ...Moseley PCL6000 7 15 Moseley PCL 6000 Document No 602 13375 01 Rev B 21B2892 Rev D 6030 Receiver Final Assembly...
Страница 163: ...Moseley PCL6000 7 25 Moseley PCL 6000 Document No 602 13375 01 Rev B 930 03595 01 Rev J Receiver RF Module 6030 Assembly...
Страница 165: ...Moseley PCL6000 7 27 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2941 Rev C IF DEMOD 6020 Assembly...
Страница 167: ...Moseley PCL6000 7 29 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B3039 Rev E Double Converter LO3 6030 Assembly...
Страница 169: ...Moseley PCL6000 7 31 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2949 Rev G FM Demod 6030 Assembly...
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Страница 183: ...Moseley PCL6000 7 45 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B3038 Rev A RF Amplifier 330 MHz Assembly...
Страница 185: ...Moseley PCL6000 7 47 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2958 Rev D RF Amplifier 450 MHz Assembly...
Страница 187: ...Moseley PCL6000 7 49 Moseley PCL 6000 Document No 602 13375 01 Rev B 21B2892 4 Rev D 6030 Receiver Final Assembly...
Страница 199: ...Moseley PCL6000 7 61 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2941 2 Rev C IF DEMOD 6020 Assembly...
Страница 201: ...Moseley PCL6000 7 63 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B3039 Rev E Double Converter LO3 6030 Assembly...
Страница 203: ...Moseley PCL6000 7 65 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2949 Rev G FM Demod 6030 Assembly...
Страница 215: ...Moseley PCL6000 7 77 Moseley PCL 6000 Document No 602 13375 01 Rev B 91B7379 Rev C RF Amplifier 950 MHz 6w Schematic...
Страница 217: ...Moseley PCL6000 7 79 Moseley PCL 6000 Document No 602 13375 01 Rev B 21B2891 1 Rev D 6020 Receiver Final Assembly...
Страница 219: ...Moseley PCL6000 7 81 Moseley PCL 6000 Document No 602 13375 01 Rev B 21B2915 Rev D 6060 Receiver Final Assembly...
Страница 231: ...Moseley PCL6000 7 93 Moseley PCL 6000 Document No 602 13375 01 Rev B 91D7274 2 Rev J Preamp 1st Mixer 6060 Schematic...
Страница 233: ...Moseley PCL6000 7 95 Moseley PCL 6000 Document No 602 13375 01 Rev B 91B7375 Rev C IF Demod 6020 Schematic...
Страница 237: ...Moseley PCL6000 7 99 Moseley PCL 6000 Document No 602 13375 01 Rev B 91B7387 Rev F FM Demod 6030 6060 Schematic...
Страница 251: ...Moseley PCL6000 7 113 Moseley PCL 6000 Document No 602 13375 01 Rev B 930 03462 01 Rev H Transmitter RF Module Assembly...
Страница 255: ...Moseley PCL6000 7 117 Moseley PCL 6000 Document No 602 13375 01 Rev B 21B2927 Rev C 6030 Receiver Final Assembly...
Страница 267: ...Moseley PCL6000 7 129 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B3039 Rev E Double Converter LO3 6030 Assembly...
Страница 269: ...Moseley PCL6000 7 131 Moseley PCL 6000 Document No 602 13375 01 Rev B 20B2949 Rev G FM Demod 6030 Assembly...
Страница 271: ...Moseley PCL6000 7 133 Moseley PCL 6000 Document No 602 13375 01 Rev B 20C3104 Rev A Channel Control Assembly...
Страница 273: ...Moseley PCL6000 7 135 Moseley PCL 6000 Document No 602 13375 01 Rev B 917515 Rev A Channel Control Schematic 2 of 4...
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Страница 277: ...Moseley PCL6000 7 139 Moseley PCL 6000 Document No 602 13375 01 Rev B 910 08614 01 Rev B PCL 6020 Multichannel Option...
