Setup; Vhf Interface Unit - Furuno VR-3000 Installation Manual

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
Location of DIP switches and jumper wire in VHF interface unit
Segment # of DS2 and DS4
#1 (10 dB ATT)
#2 (MIX)
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.
46
Functions of #1 and #2 segments of DS2 and DS4
Attenuates speaker signal by 10 dB. Factory-setting: OFF
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
DS1
CN9
JP1
# 4
# 5
DS2
#7
#8
DS3
DS4
Function
OUT1
To VDR
OUT2