Pub. 42004-374A
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 370-202 Interface Amplifier
Assembly for Electro- S ound
Confidentiality Notice
This manual is pr ovided s olely as a n op erat ional, installation, and maintenance guide and contains sens itive
bus ines s and t echnic al infor ma tion tha t is confident i al and p roprietary to G AI-Tronics. GAI-Tronics
retains a ll intellectual pr operty and other rights in or to t he inf ormation c ontained herein, and s uch
informa tion may only be used in connection wit h the operation of you r GAI- Tronic s pr oduct or system.
This ma nual may not be disclosed in any form, in whole or in p art, dir ec tly or indirectly, to any t hird pa rty.
Introduction
The Model 370-202 Interface Amplifier for Electro-Sound allows GAI-Tronics’ Page/Party® systems to
interf ace with GAI - Tronic s’ Elect ro-S ound systems. T his unit interconnect s two voice circuit s tha t are
dissimilar in voltage and/or impedance. The inter f ace amplifier is not just a matc hing transfor mer ; it a lso
includes a gain a djustment that c ompens ates f or differ ences in signal levels or per mit s use with a range of
signal level. I t can also b e u sed in other paging sys tems.
Consisting of: Model
No.
370-202 371-202 372A
Amplifier Enclosure
Installation
WARNING
Do not install the Model 370-202 equipment in hazardous areas; such installation may cause a safety
hazard and consequent injury or property damage.
Enclosure Placement
The Model 370-202 Interface Amplifier Assembly should be located near the Model 10456-001
Electro-Sound power source and within 300 feet of the Model 305-001 Line Balance Assembly for the
GAI-Tronics Pa ge/Pa rty
®
system.
GAI-Tronics Corporation P.O. Box 1060, Reading, PA 19607-1060 USA
610-777-1374 800-492-1212 Fax : 610-796-5954
ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS
V
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Model 370-202 Interface Ampli fier Assembly for E lectro-Sound Page: 2 of 9
Figure 1. Model 372A Indoor Enc l osur e M ounting
Mounting
The indoor enclosur e is not supplied with openings for condu it or cable. Drill or punch these openings
using t he s upplied t emplate before mounting the enclosure. W e recommend placing the conduit holes nea r
the rea r sur fac e o f the top o r bo tto m of the enclos ure. Avoid the t op center, as it may i n ter fere wi th t he
plug-in amplifier receptacle.
There are four 5/16-inch diameter mounting holes in the corners of the Model 372A Amplifier Enclosure
See Figu re 1. W hen mount i ng the enclosure, use cau tion to a void damaging the terminal blocks ins ide.
The suggested mounting height for all station enclosures is 54 inches (137 cm) to the bottom of the
enclosure.
Connect the conduit to the enclosure, then feed the wiring t hrough t he conduit int o the enclosure. When
wiring t he s tat ion, follow the wire colors carefully; the colors noted in Figure 2 correspond to GAI- Tronic s
60038 Series cable. The wires should be spade-lugged and connected prop erly to t he t erminal bl oc k. An
improper termination may result in diminished s tat ion performance.
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Model 370-202 Interface Ampli fier Assembly for E lectro-Sound Page: 3 of 9
Wiring a Model 370-202 Between a Page/Party® System and an Electro-Sound II System
Figure 2 shows the wir ing of a t hree-wire E lec tro-Sound s ystem interfaced t o a five-p arty Page/Party®
syst em. Handsets or headsets p l ugged into jack sta tions a re normally tied to part y line 5 but switch to the
page line whenever t he p age switc h on the hands et s or hea dsets is pus hed. The p ower source contains a
relay that disconnect s the coupling when no handset or heads et is plugged in and anot her relay for
switching b etween page and p arty lines.
The wiring shown in Figure 2 provides ac power to Model 471 Electro-Sound Power Source, Model 370202 Interface Amplifier Assembly, and Page/Party
®
wall st ations .
The wir i ng to the interfac e s hown in Figure 2 ca n be modified for t wo- wire Elect ro-S ound systems. S ee the
Electro-Sound installation manual, 42004-072. It is absolutely necessary to place a 33-ohm load between
points four and five or between points six and seven on the power sour c e enclosur e terminal b l oc ks if thes e
points are not
oscilla te if these r es istor s or t he Page/Party
connected to a pa ge or pa rty s ystem. The two-wa y amplifier in the Model 370-202 may
®
Line Balance Assembly is not connect ed t o the Model 370-
202 Interface.
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