User's Manual

FRONT PANEL FEATURES (refer to drawing 580320-PINOUTS)
Stereo/Mono Switch
Set to appropriate setting
Modulation LED’s
LED’s should usually be in the green, with occasional flashes of RED. No LED’s lighted
indicates no audio input.
SW2(LSB)/SW1 (MSB)
Set to appropriate channel. Reference the Frequency Allocation Chart.
Power LED
LED is lighted when power is applied. No light indicates either there is no power to the
ACU, or the re-settable fuse has been tripped. If the PTC re-settable fuse is tripped, it
will reset itself when the problem is resolved and the re-settable fuse cools.
ANT OUT A
Connect to “A” car antenna system.
ANT OUT B
Connect to “B” car antenna system. Power to this port is attenuated by 4 dB vs the “A”
antenna connection port to compensate for cable losses in the longer “A” car antenna
cabling.
J1 POWER IN
Connects to 37.5-volt supply.
J2 ETHERNET/SU
Connect to Ethernet port of the subscriber unit. This is a pass through connection from
J6. Internally, the ACU supplies power to the SU from this port via pins 6 through 9.
See drawing 460320.
J3 ISO IN
Connects internally to pins 11 and 14 on J7.
J4 MONO CH1, 2, 3
Balanced Audio Inputs for mono channels.
J5 STEREO CH 5, 6, 7
Balanced Audio Inputs for stereo channels.
J6 ETHERNET/VMC
Connect to Ethernet port on VMC. Passes signal directly through to J2.
J7 ST CH4/ISO OUT
Audio Input for Ch 4
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