Antennas
Radio Antennas
Antenna arrangement is crucial to quality radio reception, and AM and FM antennas should be placed at the highest point of the roof and at least
six feet away from any electrical or intercom wiring. VMC1 requires two antennas, one for AM and one for FM reception. The AM antenna is 25-foot
in wire length, and the FM antenna is a 25-foot length of coax with a “T” shaped wire dipole at one end that attaches between rafters in the attic.
IMPORTANT! Isolate the antenna leads from the intercom station cables by running them through a separate hole in the ceiling plate. If grouped
together, the intercom station cables can shield the antenna leads resulting in poor radio reception. Also keep the antenna leads away from metal
duct work and aluminum backed insulation, which reduces reception.
AM ANTENNA
1. Unroll and examine the 25-foot AM antenna wire.
2. Create a large loop with the antenna wire in an
appropriate location, ideally in an attic. Note that the
length of the antenna wire can be extended by splicing
any insulated wire onto the ends of the provided
antenna wire.
3. Route the two ends of the antenna down through the
hole in the ceiling plate, down the stud bay to where
the VMC1MB was installed. Avoid running it parallel to
the AC power lines and intercom CAT5 cables as this
may interfere with radio reception.
NOTE: the overall length of the antenna wire may be extended
by splicing on to the ‘open’ end of antenna with insulated wire.
The gauge end of the wire should be strong enough to support
it without breaking.
NOTE: Some customers may want to use an external tuned loop
antenna or vertical amplified broadband antenna. Refer to those
manufacturer’s installation instructions for further information.
FM ANTENNA
1. Unroll and examine the FM antenna. The antenna is
formed by spreading the red and black wires at the
end of the COAX. The terminal lug at the end of each
wire is for screw mounting the wires outstretched. The
antenna is provided with an F type connector allowing
for easy connection of additional cable.
2. Route the connector end of the antenna COAX ( RG
6 or RG 59 ) down through the hole in the ceiling
plate, down the stud bay, and on the right side of
where the VMC1 Master Unit will be installed.
3. Connect the included 75 Ohm to 300 Ohm adapter to the end of the cable.
NOTE: Some customers may want to use an external tuned loop antenna or vertical amplified broadband antenna. Refer to those manufacturer’s installation
instructions for further information.
CAT5 TO
STATIONS
AM ANTENNA WIRE
FM ANTENNA
DIPOLE
WALL HOUSING
(VMC1HC )
CEILING
PLATE
VMC1 Antenna
Figure 7
WARNING
ALL AC ELECTRICAL CONNECTIONS TO THE POWER SOURCE TE6D POWER SUPPLY MUST BE MADE BY A LICENSED ELECTRICIAN AND
MUST OBSERVE ALL NATIONAL AND LOCAL ELECTRICAL CODES
17
Summary of Contents for M&S VMC1
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