20
Connectors, Indicators, Controls, and Jumpers
Series C
Federal Signal www.fedsig.com
8. Connect the Receive audio input Hi (TB2 pin 7) to the transceiver’s receive audio
output.
9. Connect the Receive audio Low (TB2 pin 8) to TB10 - Ground.
Figure 4 Unbalanced Interface Connections (TB2)
GND
CAR DET
RX AUD LO
RX AUD HI
TX AUD LO
TX AUD HI
LOC TX AUD
PTTNC
PTTNO
PTTCOM
GROUND
CARRIER DET
RX AUD +DE-EMPHASIZED/MUTE
TX AUD
PTT-N.O.
TB2
10
9
8
7
6
5
4
3
2
1
TRANSMIT AUDIO
FROM OTHER
EQUIPMENT
TRANSCEIVER
INTERFACE
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
TRANSCEIVER/RADIO
Balanced Interface
To connect a balanced interface:
1. Connect the PTT relay COM output (TB2 pin 1) to TB10 - Ground.
2. Connect the PTT relay N.O. output (TB2 pin 2) to the transceiver and PTT input.
3. Connect the Carrier detect ground (TB2 pin 10) to the transceiver’s ground.
4. Connect the Carrier detect (TB2 pin 9) to the transceiver’s carrier detect output. Jump
the unit to accept either active low or active high carrier detect. If the carrier detect is
not available, jump the unit for VOX.
5. If other equipment is using this transceiver, connect its transmit audio to TB2 pin 4.
When the is transmitting, it interrupts this tx audio.
6. Connect the Transmit audio Hi and Low outputs (TB2 pins 5 and 6) to the transceiver’s
transmit audio input.
7. Connect the Receive audio inputs Hi and Low (TB2 pins 7 and 8) to the transceiver’s
receive audio output.