Instruction manual

Installation
025-9416 73
Remotely Located Transmitters
Most radio stations for wide area paging are located at a distance from the Model 640 paging
terminal. To accommodate this type of application, the station card can be programmed for
single- or multiple-site remote control. (Set in the Model 640 transmitter databases. See the
Model 640 Operating and Programming Manual, Part No. 025-9417, for details.)
The remote control is compatible with Motorola PURC® transmitter control shelf equipment or
a Zetron Model 66 Transmitter Control Panel. When so equipped, the Zetron station card can
directly drive a dedicated line or link transmitter with just a few wires.
Figure 37 illustrates the basic connections between the Model 640 and a link transmitter. In this
application, the colocated equipment sends pages out to the main paging transmitter by way of
RF or microwave link.
Tone Audio
PTT
Ground
Tx Audio HI/LO
Aux PTT NO
Aux COM
PURC® tone
signal leads
Model 640 with
PURC®-compatible
station output
Link
Transmitter
RF or µwave
link
Zetron
Model 66
Link
Receiver
PURC
Paging
Transmitter
Figure 37. Remote Transmitter Connected by way of RF Link
Notes on Figure 37:
The following parameter settings are typical for connection to a Model 66 or a Motorola PURC® transmitter. In the
Model 640 database set:
Transmitter Key Type database (these value correspond to default “purc” record):
StaRmtCtrl = purc
ModeTime = 100 ms
DigDataPolarity = “0” for inverted data
Transmitter Key Up Control database:
KeyUpDelay = 420 ms HLGT (set to 120 ms for HLGT plus 300 ms per RF link delay
1 link = 420, 2 links = 720, etc.)
Figure 38 illustrates the basic connections between the Model 640 and a leased telco trunk. In
this application the remotely located transmitter (and controller) are directly connected to the
phone line and keyed by the TIP and RING pair.