Icom VE-PG4 Installation Guide ver.1.34 - Page 29

Distance between the antennas, To reduce interference, Configuring the transceivers and repeaters

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2 Setting up the transceivers Configuring the transceivers and repeaters ■■Distance between the antennas When two or more transceivers are connected to the VE-PG4, separate their antennas as far as possible to reduce interference between them. ■■To reduce interference When two or more transceivers are connected to the VE-PG4, the transmit signal from one transceiver may interfere with the other transceivers. Interference can be reduced by the methods shown below. zz Using the antenna directivity Even a non-directive antenna has less transmit emission in the vertical direction. When installing two antennas, mount them at different heights to reduce interference. VE-PG4 Transceivers Antennas Difference in height: More than 1 m, 3.3 ft zz Using a solid object as the shield screen A solid object (such as a concrete wall which has a metal frame inside, metal locker, and so on.) in between two antennas behaves like a shield screen for the transmit signal, and can reduce interference. Behaves like a shield screen. Antenna Antenna Transceiver VE-PG4 Transceiver zz Setting the channel (frequency) spacing to wide There may be interference from an adjacent channel (frequency). Setting the channel (frequency) spacing to wide can reduce interference. zz Setting the TX output power to Low Setting the transmit power to low can reduce interference. But, note that it also reduces the coverage area. 2-4

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2
SETTING UP THE TRANSCEIVERS
2-4
Configuring the transceivers and repeaters
■
Distance between the antennas
When two or more transceivers are connected to the VE-PG4, separate their antennas as far as possible to
reduce interference between them.
■
To reduce interference
When two or more transceivers are connected to the VE-PG4, the transmit signal from one transceiver may
interfere with the other transceivers.
Interference can be reduced by the methods shown below.
z
Using the antenna directivity
Even a non-directive antenna has less transmit emission in the vertical direction. When installing two
antennas, mount them at different heights to reduce interference.
Transceivers
Difference in height:
More than 1 m, 3.3 ft
Antennas
VE-PG4
z
Using a solid object as the shield screen
A solid object (such as a concrete wall which has a metal frame
inside, metal locker, and so on.) in between two antennas behaves
like a shield screen for the transmit signal, and can reduce interference.
Transceiver
Transceiver
Behaves like a shield screen.
Antenna
Antenna
VE-PG4
z
Setting the channel (frequency) spacing to wide
There may be interference from an adjacent channel (frequency).
Setting the channel (frequency) spacing to wide can reduce interference.
z
Setting the TX output power to Low
Setting the transmit power to low can reduce interference.
But, note that it also reduces the coverage area.