Instruction manual

Installation
76 025-9416
Model 640 Radio
Station Output
Local Paging
Transmitter Inputs
DIG DATA (42) DIGITAL DATA
DIG MODE (14) DIGITAL MODE
ZONE ADR 1
1
(47)
AUX PTT NO (23)
PUSH TO TALK
XMIT AUDIO HI (15)
AUDIO HI
AUX PTT COM (18) GROUND
GROUND (17)
XMIT AUDIO LO
2
(40) AUDIO LO
Link Transmitter
Signal Inputs
PUSH TO TALK
AUDIO HI
GROUND
AUDIO LO
Figure 40. Wiring Configuration for Combination Transmitter Control
Notes on Figure 40:
1. The zone output drives the PTT and audio relays. The local transmitter is zone #00 and the link transmitter is
zone #01. (Zone address outputs from the Model 640 are active low.)
2. The audio low signal is not hooked to a separate relay because internal coils connect it to the audio high circuit.
This ensures that both high and low audio are sent together.
RF and Microwave Transmitter Link Controllers
A transmitter link controller is used when the Model 640 station interface is not sufficient to
drive the link transmitter (non-PURCĀ® applications). The transmitter link controller is installed
at the paging terminal site between the Model 640 and the link transmitter. See Figure 37 for the
basic system configuration.
NC
NO
NC
NO