Samyung SRG-315DN, Руководство пользователя

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Chapter 14. NBDP Terminal Circuit
14.1. Overview
SN-100 consists of NBDP Receiver, CONNECTION
BOARD, CPU BOARD, PLL BOARD, and POWER
SUPPLY.
There is power input, SRG-3150DN connector,
W/K receiving connector, TX AND RX cable
connector, EARTH Plate, keyboard connector, EMC
LIGHT connector in the down part of rear side.
14.2. Connection board T-130
As T-130 is PCB which is connecting CPU
BOARD and other PCBs, when receiving, the signals
that come from NBDP receiver pass active filter
consisted of IC5, IC6, IC7, IC8 and then, as it is
made square wave as clipping through U5,
DOT/PATTERN signal is generated. When receiving,
1.7kHz
±
85Hz signals are generated through DM1
and then it is delivered to SRG-3150DN.
14.3. NBDP receiving unit (T-132)
T-132 PCB is NBDP receiving unit which consists
of frequency filter and amplifier, MIXER, ATT, AGC,
B.K control circuit.
After the signals received through MF/HF Antenna
amplify with wide amplifier, it is divided into two
parts through SPLITTER (SP1)
①
The inside of NBDP Receiving unit
The signal that comes into filter selects the filter
assigned each frequency as U4 and U6. And, 1'st
LOCAL through IC2, 2'nd LOCAL through IC1, and
BFO signal through U1 should be mixed. And then,
MARK (1.7kHz-85Hz) and SPACE (1.7 kHz + 80 Hz)
signals are generated.
②
One side is delivered to SRG-3150DN through
attenuator and matching tool.
14.4. Local Synthesizer board (T-133)
As T-133 is SYNTHERSIZER PLL PCB, PLL IC and
VCO (POS-100) make up PLL. And, it is outputted
to 1
st
LOCAL input-signal and, as 7 MHZ that is
generated from output of PLL IC (IC15) generates
49MHZ in 7 multiply circuit, it is used as 2
nd
LOCAL.
BFO signal is that DM1 received 7MHZ generated
456.7 kHz. Besides, as it transmits and receives
with CPU BOARD it generates the signal that
controls NBDP receiver.
14.5. Power Circuit (T-025)
Power circuit consists of constant voltage circuit.
And while power on, it makes ON main power DC
24V, convert constant v12V, +8V, +5V.
If it is overpowered +32V, then power off.
Prevention to reversing voltage circuit is built-in.
14.6. Function Diagram of Rear Side
①
EMC : Supply power +24 to emg light.
②
RX ANT IN : Impedance 50
Ω
MF / HF RX ant
Input jack.
③
ANT OUT : Connect which send W/K signal
Received from 'RX /ant in' to main unit
④
Key-Board : Connect between keyboard and
SN-100. 5V. Data. clk etc.
⑤
GND : Receiver System Ground
⑥
FUSE : 5A Fuse(P24V Fuse)
⑦
Printer : Connect to Printer
⑧
Printer Power : Connector which supplies
+24V, +8V, GND to printer
⑨
FUSE : 3A Fuse(Power Supply Fuse)
⑩
Connector To Main Unit :
When connected to SRG-3150DN, transceiver
PTT IN, PTT OUT, READY, Data AF+, AF-.