Examples of Mobile Relay Station Operation
The following examples of the operation describes the behavior in a P25 Conventional system, but ID, frequency, and
Signaling (QT/DQT, RAN) are transferred by the same the behavior in Analog Conventional and NXDN Conventional
systems.
Also, all functions of each Conventional system, such as Optional Signaling (DTMF, 2-tone, MDC-1200, FleetSync, NXDN
ID), Encryption, Emergency, and the functions of various calls, can be used.
Operation example 1
This is the example of the operation if
Mobile Relay Station
is used with the UHF transceiver as the transmitting unit and
the VHF transceiver as the receiving unit in a P25 Conventional system.
The channel configurations of RF Deck 1 and RF Deck 2 are as follows:
Table 16-16 Mobile Relay Channel
RF Deck
Unit ID
Talkgroup ID
Receive
Frequency
Transmit
Frequency
NAC Decode NAC Encode
RF Deck 1
1
1
460.5 MHz
465.5 MHz
293
29A
RF Deck 2
2
2
144.5 MHz
145.5 MHz
29B
29C
RF Deck 1
UHF
VHF
KRK-15B
Control
Head 1
KRK-15B
RF Deck 2
Subscriber Unit A
(UHF)
Subscriber Unit B
(VHF)
Unit ID = A
Talkgroup ID = B
TX Frequency = 460.5 MHz
NAC Enc = 293
Unit ID = B
Talkgroup ID = B
RX Frequency = 145.5 MHz
NAC Dec = 29C
Source Unit ID = A
Talkgroup ID = B (Unit ID = A)
TX Freq = 145.5 MHz (RF Deck 2)
NAC Enc = 29C (RF Deck 2)
PTT ON →
Figure 16-81 16-81 Mobile Relay Station (Operation Example 1)
In this case, RF Deck 1 behaves as the receiving repeater and RF Deck 2 behaves as the transmitting repeater.
Contrary to the example shown above, RF Deck 2 can behave as the receiving repeater and RF Deck 1 can behave as the
transmitting repeater.
16 MULTI RF DECK/ MULTI CONTROL HEAD
16.18 Relaying the Received Signal (Mobile Relay Station)
Common FUNC (K, F)/Ver 2.20
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