Pub. 42004-432E
G A I
-
T R O N I
C S
®
A H U B B E L L C
O M P A N Y
Model 370-400 UHF and 370-420 VHF
Page/Party
®
Radio Couplers
GAI-Tronics Corporation 3030 Kutztown Road Reading, PA 19605 USA
610-777-1374
800-492-1212
Fax: 610-796-5954
V
ISIT WWW
.
GAI
-
TRONICS
.
COM FOR PRODUCT LITERATURE AND MANUALS
Confidentiality Notice
This manual is provided solely as an installation, operation, and maintenance guide and contains sensitive
business and technical information that is confidential and proprietary to GAI-Tronics. GAI-Tronics
retains all intellectual property and other rights in or to the information contained herein, and such
information may only be used in connection with the operation of your GAI-Tronics product or system.
This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any third
party.
General Information
Product Overview
The Model 370-400 UHF and 370-420 VHF Page/Party
®
Radio
Couplers allow a GAI-Tronics Page/Party
®
system to
communicate with a wireless radio system. Radio users,
located outside the facility at a remote location or inside a
plant, can communicate with Page/Party
®
users.
The coupler works as a half-duplex system in that audio is only
heard in one direction at a time. The current audio path takes
precedent over the system and the other audio path cannot
engage until the current audio path releases control. The audio
path to the Page/Party
®
system is gated by the carrier detect
signal from the radio. A VOX circuit that monitors the audio
level on the page or party line, whichever is currently active,
gates the audio path to the radio.
The coupler converts audio levels from the Page/Party
®
system
to the appropriate radio signal levels that are then transmitted
on a defined carrier frequency programmed into the radio. The
Page/Party
®
Radio Coupler senses off-hook characteristics of
the Page/Party
®
system and routes party line audio or page line
audio to the radio. Party line audio takes precedence over page
line audio.
The coupler converts the radio signal to the appropriate signal levels for the Page/Party
®
system. The
module has a relay output that activates during the presence of the programmed carrier frequency.
Figure 1. Outline of Model 370-400
