Volvo Trucks North America, Inc. Date Group No. Page
Service Bulletin 4.2004 392 08 44(47)
•
Multiplexer – A modification of the fixed mast design
for operation of CB radio, cellular phone and stereo
receiver. The multiplexer antenna system used in
the Volvo VN/VHD series vehicle uses a combination
AM/FM and CB radio antenna mast. The windings in
the antenna are specific to this system and require
no tuning. Always replace the antenna mast with
OEM replacement parts. The use of a standard CB
antenna mast will give unsatisfactory performance for
CB reception and very poor or no reception on AM,
FM and cellular phone frequencies. The multiplexer
antenna mast used in the VN/VHD series can be
identified by the clear plastic covering exposing the
antenna windings and a top cap with the RAMI
®
logo.
Note: Multiplex antennas are available with single (drivers
side only) or dual antennas.
W3003138
The multiplexer antenna system is standard on
the Volvo VN 660, VN 770 and optional on other
VN/VHD model vehicles.
1 Cellular phone antenna cable (option).
2 Radio antenna cable.
3 Left side antenna mount.
4 CB radio antenna connection.
5 Right side antenna.
6 Multiband antenna mast.
7 Cellular phone antenna ground plane.
Antenna Lead-In Cable
The antenna lead-in cable carries the RF signal from
the antenna to the AM/FM receiver. The lead-in cable
consists of a center conductor, insulating material and
an outer grounding shield. Some cables have a greater
distance between the center conductor and outer shield
so the cable acts less like a capacitor and less signal is
lost on the lead-in. Receivers are matched or tuned to a
specific lead-in type and cable length. Always use OEM
replacement cables.
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