27.1.1999
4Z0700GB.__2
36
Product: TDP-52-SN3 (Sigma Gold) / Synthesizer
5.3 RF MODULE
RX Synthesizer
Synthesizer
5.3.1 General
The RX synthesizer generates an upper side injection frequency for the receiver.
The injection frequency is fed to the receiver’s first mixer.
5.3.2 Functional Description
The RX injection frequency is generated with a phase locked loop. The VCO pro-
duces the injection frequency determined by the control voltage. After the VCO
stage comes the amplifier stage Q320. After the amplifier stage, part of the signal is
fed to the synthesizer circuits I300 divider. The synthesizer circuit contains a pre-
scaler, programmable divider, reference frequency divider, and a phase detector.
The synthesizer circuit produces current pulses at output DO1 as controlled by the
phase detector. The current pulses either charge or discharge the loop filter. The
VCO control voltage is derived from the loop filter output.
The synthesizer 12.5 kHz reference frequency is made by dividing the 12.8 MHz sig-
nal from the temperature compensated oscillator (TCXO). The series-form signal
which controls the channel frequency comes from the audio/processor-module via
connector V600. SDATA, SCLK and SLE signals are common to both TX- and RX-
synthesizers. A positive pulse in the SLE line loads the division ratio (corresponding
to the frequency of the channel) fed to the SDATA line, to the synthesizer circuit
I300.
5.3.3 Control- and Output-Signals
Operating voltage
4.75VDC
Current consumption
14 mA
Output level to the receiver
+1 dBm
Frequency range
540,25...544,725 MHz
VRX
RX synthesizer operating voltage
4.75V
SCLK
Clock signal for the synthesizer control data
SDATA
Synthesizer control data
SLE
ENABLE pulse to the synthesizer
RXINJ
RX synthesizer output to the receiver
+1 dBm
RX_REG
Control line for VRX-regulator
Summary of Contents for SIGMA GOLD TDP-52-SN3
Page 1: ...27 1 1999 Dp_52ngbTOC fm 1 Product TDP 52 SN3 SERVICE MANUAL BENEFON SIGMA GOLD TDP 52 SN3 ...
Page 12: ...27 1 1999 2DP_52GB 7 Product TDP 52 SN3 General Line interface Branching unit LIF 40 DB 40 ...
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Page 161: ...27 1 1999 8hxs40gb_fm5 fm 29 Product HXS 40 External Handset HLS 41 HDS 50 HXS 40 ...
Page 162: ...27 1 1999 8OTHE_GB fm 1 9 0 OTHER ACCESSORIES OTHER ACCESSORIES ...
Page 174: ...27 1 1999 Xo0245e4_fm5 fm 13 Product LIF 40 Line Interface OO0245 Solder Side Layout PO0245A0 ...
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