GAI-Tronics 370-301 Dual Channel 600-Ohm to 33-Ohm Converter - Manual

Pub. 42004-431B
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374  800-492-1212  Fax: 610-796-5954
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G A I - T R O N I C S ® C O R P O R A T I O N
A H U B B E L L C O M P A N Y
370-301 Dual Channel
600-Ohm to 33-Ohm Converter
Confidentiality Notice
This manual is provided solely as an operational, installation, 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
The Model 370-301 Dual Channel 600-Ohm to 33-Ohm Converter
allows GAI-Tronics’ Page/Party
®
systems to interface with standard
600-ohm networks for one- or two-way communication between
dissimilar transmission mediums.
The 370-301 includes two hybrid interfaces in each channel to isolate
the audio so that the received audio in one direction does not affect the
transmit audio in the other direction.
The 370-301 includes a VOX (voice activated switch) on each of the
outputs. The VOX samples the audio out to the line. In the presence
of audio, a relay is activated for receive amplifier activation.
Features
 Two independent conversion circuits, one for party lines and one
for page lines
 Individual gain and sidetone adjustment for each audio path
 VOX detection on 33-ohm and 600-ohm interface for activating a
receiving amplifier
 AC or dc power operation
 33-ohm termination internal to unit
Figure 1. Outline of 370-301