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Raymarine Ray 53 VHF Radio with DSC Manual

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linear detector.
4.3.3 Connect the audio oscillator and PTT test Assy to Connector (J203) No.1 pin in
CNTL PCB. Set the audio oscillator to –18dBm and set the frequency to 1KHz
And then set it to transmitter mode.
4.4.4 Adjust Variable Resistor(VR4) in the RF PCB to set the deviation displayed on FM
linear detector to 4.2kHz+/-0.1kHz.
4.4.5 Set the audio oscillator to –38dBm and set the frequency to 1kHz. Confirm that the
deviation on FM linear detector should be 3.0kHz+/-0.5kHz.
4.5 Output Power Adjustment(Transmitter)
4.5.1 Connect the power supply (13.6V 10A) to the power line.and connect Power
Meter(40W, 50 ohm, 150-200MHz) to antenna connector.
4.5.2 Set the radio on CH 16(156.800MHz) and to be transmitter mode at Low power
mode.
4.5.3 Adjust the output power to 1.0W+/-0.1W by Variable Resistor (VR2) on the RF PCB.
4.5.4 Change the transmitter output selector Switch into Hi Power mode.
4.5.5 Adjust the output power to 2.5W +/-1W by Variable Resistor(VR3) on the RF PCB.
4.6 RF Sensitivity Adjustment(Receiver)
4.6.1 Connect a RF signal generator to the antenna connector and a SINAD meter to
the External speaker line.
4.6.2 Select the Weather Channel .
4.6.3 Set RF generator as follows:
Frequency : 163.275 MHz.
Modulation: 1.0 kHz
Deviation : 3.0kHz
4.6.4 Adjust T3 on RF board and make the best of SINAD sensitivity
… 39 …


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