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5 (8)
Datum -
Date
Rev
Nr -
No.
Error!
U k
Error!
U k
Error! Unknown
i h
Error! Unknown switch argument.
Tone regenerating repeater
RX
F1
TX
F2
DUPLEXER
TX = F1
RX = F2
TX = F1
RX = F2
Line panel LP3
B
B B B
B T
A A A A A
B
B
B B B
T
A A A A
A
Mobile station sends
Repeater station sends
Time
Fig 3. Tone regenerating repeater
This repeater contains the LP3 line panel. It is used as a repeater in semi
duplex systems where the repeaters must be tone controlled and only one
repeater exists on each frequency. The function of the LP3 is to analyse the
incoming tone calls to determine if it is a call to another mobile station. The
repeater will start the transmitter when a complete tone call is received and
regenerate the tone call.
The LP3 will also control the maximum talk time, absence of carrier and also
receive disconnection tone from mobile subscribers. Standard time limits are
6 minutes maximum talk time and tolerate 25 seconds absence of carrier. The
repeater will also send warning tones before disconnection due to time
limitation. A disconnection tone is sent out before disconnection. All
parameters are programmable.
