4-18
Module Characteristics
Moseley PCL 6000 Document No. 602-13375-01 Rev.B
when the quad tank is tuned to center frequency, therefore a demod balance voltage is available
(TP1) that should be 0 ± 0.5 volt when tuned properly. The test point is available on the
Audio/Power Supply board for metering.
4.3.5
Double Converter/LO3 (PCL6030/6060)
System selectivity of the receiver is provided by the Double Converter/LO3 module. The following
discussion will describe the signal flow.
The input signal is amplified by Q1 to overcome the insertion loss of the 70 MHz bandpass filter.
This amplifier also acts as an impedance transformer from the 50 ohm input impedance to the
3000 ohm impedance of the filter.
The primary purpose of the 70 MHz bandpass filter is to reduce undesired signals to levels that
will not cause intermodulation in the 2nd mixer and 2nd IF amplifiers. The 10 dB bandwidth of this
filter is 4 MHz. The output of the filter is impedance-transformed down to 50 ohms to match the
mixer. The output of the filter is applied to mixer U1 through test point E1 and the optional
attenuator at E6. This attenuator compensates for differing system gains of the PCL6030 and
PCL6060 receivers.
The signal input to mixer U1 is mixed with the 2nd LO signal to produce the 2nd IF signal at 10.7
MHz. The 2nd LO signal is provided by the synthesizer in the RF module. The mixer is double
balanced, and its IF port (10.7 MHz) is diplexed (L1, C1, C2, R1) and fed through a filter (L2, C3,
L3) to amplifier Q1. The output of the 1st 10.7 MHz amplifier (Q1) is buffered by emitter follower
Q2. The source impedance required by filter FL1 is set by R9.
The 1st 10.7 MHz IF filters FL1, FL2, and FL3 are linear phase monolithic ceramic filters that are
jumper-programmed for particular receiver configurations (MONO, WIDEBAND COMPOSITE, or
NARROWBAND COMPOSITE). C13, C14, and C15 allow a null adjustment of the filter distortion.
Amplifier U2 compensates for filter losses and buffers the impedance match between the 1st and
2nd IF filters.
In a similar fashion, the 2nd 10.7 MHz IF filters FL4 and FL5 are jumper-programmed for receiver
configurations (MONO or COMPOSITE). C21 and C22 allow a null adjustment of the filter
distortion. Amplifier U3 compensates for filter losses and buffers the impedance matching. L11
and C28 form a harmonic and noise filter for the 3rd mixer (U4).
The input to the 3rd mixer is mixed with the 13.7 MHz 3rd LO signal to produce the 3rd IF signal
at 3 MHz. The 3rd LO is comprised of crystal oscillator Q4 and buffer Q5. The 3rd mixer is also
double balanced and diplexed. The output signal is sent to the FM Demodulator module.
4.3.6
FM Demod (PCL6030/6060)
The FM Demod module performs three major functions:
1. Extraction of baseband information from the frequency modulated input signal
2. Generation of DC metering signal proportional to the logarithm of the input RF carrier
over a three-decade range
3. Generation of a mute signal to squelch the receiver when the RF input signal is too
low for reliable operation
Содержание PCL-600
Страница 1: ...User Manual Moseley PCL 6000 Doc 602 13375 01 January 2008...
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Страница 30: ...1 18 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 32: ...1 20 System Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 40: ...2 8 Installation Moseley PCL 6000 Document No 602 13375 01 Rev B Figure 2 3 Typical PCL6000 Site Installation...
Страница 64: ...3 10 Operation Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 86: ...4 22 Module Characteristics Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 133: ...Moseley PCL6000 5 47 Moseley PCL 6000 Document No 602 13375 01 Rev B...
Страница 134: ......
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...
Страница 181: ...Moseley PCL6000 7 43 Moseley PCL 6000 Document No 602 13375 01 Rev B 930 03462 013 Rev H Transmitter RF Module Assembly...
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...
Страница 275: ...Moseley PCL6000 7 137 Moseley PCL 6000 Document No 602 13375 01 Rev B 917515 Rev A Channel Control Schematic 4 of 4...
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...
