LINQ™ Repeaters
LINQ Repeat – multicast repeaters
Two or more conventional repeater connect via an IP
network to create a multicast system that expands the
coverage beyond a single repeater. In this case, the mobile subscriber
radio transmits its uplink to the green repeater. The green repeater
transmits the downlink on its own frequency while sending the
signal to the orange and blue repeaters over IP. Those repeaters
transmit their downlink on their unique frequencies thus ensuring
the signal reaches all subscriber radios in the system.
LINQ Repeat+ – multicast repeaters with subscriber voting
An optional configuration of LINQ Repeat with the added
function of subscriber voting and signal beaconing. In this case,
the mobile subscriber radio and repeaters function just as
the LINQ Repeat system would where a mobile subscriber radio passes
traffic through a repeater to other subscribers in the system.
In the background, subscriber voting and beaconing enable the
mobile subscriber to listen for the beacon from each repeater to
determine which has the strongest signal. Once determined, the mobile
subscriber radio switches to that channel for traffic uplink/downlink
transmissions. The mobile subscriber radio ignores the downlinks from
other repeaters while continuing to listen for the beacons.
LINQ Vote – single repeater with system receive voting
One transmitting repeater and two or more receive-only
repeaters (voting receivers) make up LINQ Vote.
LINQ Vote is useful when mobile or portable radio uplinks cannot
reach back to the transmitter/repeater, but the transmitter downlink can
reach the desired coverage area. In this case, there are two
voting receivers and the mobile subscriber radio uplink signals.
The voting receivers send the signals over IP to the transmitter
and selects the strongest signal to transmit in the downlink.
LINQ Vote+ – multicast repeaters with system receive voting and subscriber voting
This system has at least two transmitters and two voting
receivers with the addition of subscriber voting and beaconing.
In this case, there are two transmitters and three receivers.
Two of the receivers sense the mobile subscriber radio uplink
signal which they send over IP to the two transmitters. Each transmitter
selects the strongest signal to transmit as downlink. In the
background, the mobile subscriber radio listens for the beacon to select
the transmitter with the strongest downlink as its uplink channel.
LINQ Simulcast – simulcast repeaters with signal comparator voting
Two or more repeaters operate on the same downlink and uplink
frequency pair make up a simulcast system. No system voting or
subscriber voting is necessary. In this case, the mobile subscriber
radio sends traffic over a common uplink frequency to any repeater
within range. Each repeater sends its uplink traffic to the central comparator
to select the strongest signal. With the aid of GPS and
NTP timing synchronization, the comparator sends the traffic signal
and timing information to each transmitter for downlink at a
specific time to ensure good performance in the overlap areas.
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