GAI-Tronics 370-301 User Manual
Pub. 42004-431B
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
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
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.
®
systems to interface with standard
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
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374 800-492-1212 Fax: 610-796-5954
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
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Installation
Important Safety Instructions
1. Read, follow, and retain instructions – All safety and operating instructions should be read and
followed before operating the unit. Retain instructions for future reference.
2. Heed warnings – Adhere to all warnings of the unit and in the operating instructions.
3. Attachments - Attachments not recommended by the product manufacturer should not be used, as
they may cause hazards.
4. Servicing – Do not attempt to service this unit by yourself. Opening or removing covers may expose
you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel.
5. This permanently connected apparatus must have a UL Listed 15-amp circuit breaker incorporated in
the electrical installation of the building.
USA and Canada Consult the National Electrical Code (NFPA 70), Canadian Standards Association
(CSA 22.1), and local codes for specific requirements regarding your installation. Class 2 circuit wiring
must be performed in accordance with NEC 725.55.
WARNING
from a battery charger without the batteries connected.
In 24 V dc systems, most chargers have an unloaded output of 35 to 45 volts that can quickly damage the
equipment designed for nominal 24 volts. The maximum battery voltage should never exceed the
maximum specified input voltage.
In 24 V dc systems: Under NO condition should this equipment be operated
Mounting the Enclosure
NOTE: The enclosure is intended for indoor use only.
Mount the enclosure using the four 0.312-inch (8 mm) diameter holes located on the mounting flanges
with ¼-inch (M6) hardware. The 370-301 is not supplied with conduit or cable openings.
Remove the front panel and drill or punch entry openings in the rear section of the enclosure
Refer to Figure 2 for the suggested locations. There must be a minimum of ½ inch (13 mm) of material
between entry holes. The station is suitable for top or bottom entry per Figure 2. However, GAI-Tronics
recommends bottom entry only wherever possible.
The standard orientation shown in Figure 2 locates the power supply housing in the upper left corner.
The orientation of the enclosure can be rotated 180º to allow clear access to the top.
The 69856-xxx PCBA can then be rotated for correct orientation.
For specific details including mounting hole dimensions, refer to Figure 2. When mounting the enclosure,
use caution to avoid damaging the internal components.
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Figure 2. Mounting Details and Wire Entry Locations
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