5.6 W/R board (05P0734)
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5.6 W/R board (05P0734)
W/R board (05P0734) is a DSC receiver board: W/R 1 is a DSC distress and safety
frequencies receiver board and W/R 2 DSC general frequencies receiver board. Both are
identical.
The W/R board consists of RF amplifier, DSC signal demodulator and PLL synthesizer
local oscillator. The 18 MHz reference signal used in the PLL circuit is generated by
REF OSC board. The frequency error of AFSK signal, 1700 Hz+85 Hz is within +10
Hz.
Fig.5.6.1 Block diagram of W/R board
Specification of W/R board
Antenna impedance: 50 Ω
Receiver type: Double super heterodyne
Receiver sensitivity: Character error rate is 1 % or less with receiver input voltage of 1 µV.
Local oscillator: 1st: F+54455 kHz; 2nd: 54000 kHz; 3rd: 456.7 kHz
Intermediate frequency: 1st IF: 54455 kHz; 2nd IF: 455 kHz
Output level: -10 dBm/600 Ω
Scanning reception: 6 channels (max.) within 2 seconds
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