A: Radio Relay and Repeaters
PRC1077-MSOP
A-3
The dedicated repeater is preferred for permanent repeater applications
because it is specifically designed for continuous service with higher power
output. The receiver has a high sensitivity and high rejection of spurious
responses and the antenna is designed for maximum efficiency on the
operating frequency. These factors help ensure the best service area coverage.
PRC1077 Repeater Installation
When using the PRC1077 in a repeater system, use the 1077 Retransmission
Repeater Cable Kit to connect the two radio sets. The 1077RETRAN includes
a 50-foot cable with connectors to connect two PRC1077 transceivers
together.
1. Select transmit and receive frequencies that are separated by at least
5 MHz. Some combinations of frequencies may cause interference, so it
is prudent to experiment with various frequency combinations to
determine which are compatible with the repeater system (
refer to
Frequency Interference Chart figure on page A-4
).
2. Program the PRC1077s to be used in the repeater system with reciprocal
frequencies of the repeater frequencies, that is, the receiver frequency is
the same as the repeater transmit frequency and the transmitter frequency
is the same as the repeater receiver frequency.
3. Program a different channel with the same frequencies as the repeater,
that is, the transmit and receive frequencies are exactly the same as the
repeater. This channel can be used to contact other stations directly,
instead of going through the repeater.
4. Position the two repeater transceivers 50 feet apart, at as high an
elevation as possible. Use the AT-892/U Antenna for maximum range.
Remember that the separation between the transceivers is essential to
prevent receiver overload. Choose the locations carefully to provide
optimum service coverage. Remember that there is no advantage to
locating the transmitter or receiver in a better location as this results in
either the transmitter outperforming the receiver or the receiver
outperforming the transmitter.
5. Connect the PRC1077 transceivers together with the 1077
Retransmission Repeater Cable Kit (
refer to Transceiver Connections -
Relay System figure on page A-4
). Switch both transceivers to RETX.
6. If the repeater is used for extended service, use a heavy-duty battery to
power the transmitter, as the repeater transmitter operates continuously
while stations are communicating. The 1077 Retransmission Repeater
Cable Kit includes an external battery cable. A 12 V automobile battery
makes an excellent power source for sustaining a repeater system.
