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3. SETUP
This chapter describes how to set up and check the system.
3.1 VHF Interface Unit
3.1.1 Audio level adjustment
DS1 and DS3 are 10 dB step attenuators for channel 1 and 2 microphone lines respectively. Set
the DIP switch so that the audio output level between #4 and #5 (OUT1) and between #7 and #8
(OUT2) of CN9 is 0 dBm (2.2 Vp-p).
Factory-setting: 10 dB (ON); 20 dB (OFF); 30 dB (OFF) and 40 dB (OFF).
Channel 1 Input
Channel 2 Input
DS1
DS2
DS3
DS4
CN9
JP1
OUT1
#
5
#
4
OUT2
#7
#8
To VDR
Location of DIP switches and jumper wire in VHF interface unit
Functions of #1 and #2 segments of DS2 and DS4
Segment # of DS2 and DS4 Function
#1 (10 dB ATT) Attenuates speaker signal by 10 dB. Factory-setting: OFF
#2 (MIX) When set to OFF, either “mic” or “sp” signal is sent to the VDR
according to the PTT switch status. When ON, both “mic” and
“sp” signals are always sent to the VDR. Factory-setting: OFF
3.1.2 Jumper setting
Jumper wire JP1 functions as follows:
• Short circuit (Factory-setting): “Input” signals from CH1 and CH2 are output from OUT 1 port
and OUT 2 port, respectively.
• Open circuit: “Input” signals from CH1 and CH2 are output from OUT 1 port.
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