Antenna Installation
Radio Antennas
VMC1 requires two antennas, one for AM and one for FM reception.The AM antenna is a
Antenna arrangement is crucial to quality radio reception. 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.
✓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 the
2.Route the antenna wire to the best location, ideally in an attic.
3.Route the antenna wire down through the hole in the ceiling plate, down the stud bay to where the VMC1MB was installed (see Figure 9).
✓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.Use screws to attach the red and black antenna leads to the structure outstretched (See Figure 9).
3.Route the connector end of the antenna COAX 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.
4.Connect the included 75 Ohm to 300 Ohm adapter to the end of the cable.
ORIENTATE FM ANTENNA
FOR STRONGEST RECEPTION
| ATTIC |
FM ANTENNA | AM ANTENNA |
WIRING | WIRING |
MASTER STATION | |
- 
+
75 OHM TO 300 OHM ADAPTER 
Figure 9. Antenna Location
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