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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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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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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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Figure 2. Page/Party
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®
to Electro- Sound
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Checkout and Adjustment
1. After the Model 370-202 is installed and connected to t he p ower, ver i f y that normal use of t he
Page/Party
®
system has not been affected by the addition of the Model 370-202 Interface Amplifier
Assembly. Make sure that t he G AI - Tronic s sidetone level (t he amount of tra nsmitted signal from the
microphone t hat is heard in t he receiver) is not substantia lly affected when the interface is connected to
the system.
If osc illation, distortion, or exc es sive sidetone occurs , check the M odel 370-202 installation wiring and
ensure that the Model 305-001 Line Balance Assembly is properly installed and connected. See
®
42004-139, the GAI-Tronics 700 Series Page/Party
Systems installat ion ma nual. If nor ma l opera tion
is not restored, proceed to S tep 3.
2. After the Model 370-202 Interface has been installed and connected to the Electro- Sound system and
®
the GAI-Tronics Page/Party
hear d over the page speakers on the Pa ge/ Party
syst em, verify that a page initiated from the Electro-S ound system can be
®
system.
3. After system basic operation has been verified, adjust the Model 370-202 Interface if necessary. First,
®
establish communications between the Elect ro-Sound system and the Page/P arty
handset station
nearest the interface. Follow Sub-steps A through C to complete the Model 370-202 adjustment.
Adjust ments are made through the p lugged acces s holes on the front cover.
A. The Balance Control is adjus ted for minimum sidetone a t the GAI- Tronic s station. To perfor m
this adjustment, blow into the microphone of the GAI- Tronic s hands et and adjust the balance
potentiometer on the Model 370-202 Interface to “null out” the microphone signal from the
receiver.
B. Adju st the Line to GAI-Tronics potent iometer until t he volu me of t he voice of the caller on the
Electro-Sou nd system is comparable to normal voice levels on the GAI-Tronics system. (See note
below).
C. Adjust the GAI-Tronics to Line p otentiometer u ntil the volume of the signal fr om t he GAI - Tronic s
syst em to E l ectro-Sound system is compa rab le to normal system voice levels. ( See note below).
N
OTE: If the LINE TO GTC and/or the GTC TO LINE contr ols are s et too high, oscillation and
distortion may result. In t his event, decrease t hese control s ettings, rea djust the BALANCE
control as necessary, and res et the LINE
TO GTC and/ or the GTC TO LINE controls for optimum
levels below the point at which osc illation occ urs .
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One-Way Operation
If the Model 370-202 Interface is only used for one- way communication, jump er wires loc ated on the
Model 370-202 two-way amplifier printed circuit card (69056-002) can be removed to improve amplifier
stability and per f ormance.
If the Model 370-202 is used for one-way communications ONLY, complete the following a djustments :
1. For Electro-Sound system to the GTC system, cut Jumper W-4.
2. For th e GT C sy stem page l i n e to Elect ro-Sou n d system or central amplif i er, cut Ju mper W-3 .
When the Model 370-202 is operated in a one-way mode, the BALANCE control will have no effect on
operation. W hen W- 4 is cut, only t he LINE
TO GTC control will be functional. The GTC TO LINE
potentiometer will b e active if W-3 is cut.
Model 370-202 Applications
In Figure 3, a Model 370-202 Interface allows the following options:
• paging to be initiated by either a Page/Party
®
station or a t hree-wire El ectro- Sound system
• two-wa y party line communication to occur at a pr earranged t i me
Further , where a three-wire Electro-Sou nd system (E lectro-Sound wit h p aging) is insta lled and more than
ten Page/Party
®
speaker amplifiers, (650 Series), are used to power the speakers, a Model 370-202
Interface is required. See 42004-072, the Electro-Sound Communications System installation manual, for
more information.
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Figure 3.
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Special Applications
Please conta c t your G AI - Tronic s’ Representative for more detailed information on the cap abilities and
special applications of the 370 Series. The 370 Series can also be used with the following:
• Mine Page Telephones
• Two 370-202 Interface Amplifier Assemblies can be used to connect two Page/Party
®
systems together
through a t elephone line or a simple twis ted pair of wir es .
• An interface to a c entral amplifier
Maintenance
The construction of the 371 Series Plug-in Two-way Amplifier allows replacement of either the printed
circuit board assembly (PCBA) or two fuses without the need for soldering. The Model 371-202 is used to
interface Page/Party
®
systems to Electro-Sound systems.
Replacement Parts
Part No. Description 371-202 372A
61508-010 Harness Assembly
12535-001 Enclosure Hardware Kit (5 sets)
12508-002 Ca ptive Screw Kit
69056-002 PCBA, Two-way Amp (GTC-Electro-Sound Line)
25210-005 Gasket
12601-001 PCBA Standoffs (10 pack)
12604-002
12604-005
Fuse, Slow-Blow 1/16A (0.25 × 1.25, 250 V) (10 pack)
Fuse, Slow-Blow 0.3A (0.25 × 1.25, 250 V) (10 pack)
10440-001 Maintenance Cable
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Specifications
Audio Characteristics
Line Terminals Output: GAI-Tronics Terminals Input; 1000 Hz
Load impedance................................................................................................................ 600-1000 ohms
Output source impedance.............................................................................................. 600 ohms, nominal
Output level.......................................................................................... 0.78 V
Maximum output............................................................................................. 2.0 V
Input level......................................................................................... 1.5 V
RMS
Frequency response............................................................................................ 250-4000 Hz (0, -0.5 dB)
Harmonic distortion.......................................................................................................... 0.6% maximu m
GAI-Tronics Line Terminals Output: Line Terminals Input; 1000 Hz
Load impedance............................................................................................................. 33 ohms, nominal
Output source impedance......................................................................................... 1000 ohms, minimum
Output level............................................................................................ 1.5 V
Maximum output............................................................................................. 1.9 V
Input level...................................................................................... 0.78 V
RMS
Frequency response................................................................................................ 250-4000 Hz (0, -4dB)
Harmonic distortion.......................................................................................................... 0.6% maximu m
, nom. (with nom. inpu t)
RMS
(with nom. inp ut)
RMS
, nom.; 0.39 V
, nom. (with nom. inpu t)
RMS
(with nom. inp ut)
RMS
, nom.; 0.21 V
mini mum
RMS
, minimum
RMS
Power Requirements
120 V ac................................................................................................... 105-130 V ac, 50-60 Hz, 10 W
24 V dc............................................................................................................... 21-28 V dc, .1 amp max.
Physical Characteristics
Controls.........................................................................................................Gain control GTC TO LINE
Gain control LINE
BALANCE
Control (to compensate line capacitance)
Temperature range............................................................................ -22º F to +158º F (-30º C to +70º C)
Construction/finish..................................................... 16-gauge cold-rolled steel/gray polyurethane enamel
Mounting............................................................................Wall or column, four 5/16-inch mounting holds
Connections ...............................................................................Internal screw-type barrier terminal blocks
Dimensions............................................................. 8.1 H × 8.1 W × 5.1 D inches; (206 × 206 × 129 mm)
Shipping weight.................................................................................................................. 11 lbs (4.8 kg)
TO GTC
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Warranty
Equipment. GAI-Tronics warrants for a period of one (1) year from the date of shipment, that any
GAI-Tronics equipment supplied hereunder shall be free of defects in material and workmanship, shall
comply with the then-current product specifications and product literature, and if applicable, shall be fit
for the purpose specified in the agreed-upon quotation or proposal document. If (a) Seller’s goods prove
to be defective in workmanship and/or material under normal and proper usage, or unfit for the purpose
specified and agreed upon, and (b) Buyer’s claim is made within the warranty period set forth above,
Buyer may return such goods to GAI-Tronics’ nearest depot repair facility, freight prepaid, at which time
they will be repaired or replaced, at Seller’s option, without charge to Buyer. Repair or replacement shall
be Buyer’s sole and exclusive remedy. The warranty period on any repaired or replacement equipment
shall be the greater of the ninety (90) day repair warranty or one (1) year from the date the original
equipment was shipped. In no event shall GAI-Tronics warranty obligations with respect to equipment
exceed 100% of the total cost of the equipment supplied hereunder. Buyer may also be entitled to the
manufacturer’s warranty on any third-party goods supplied by GAI-Tronics hereunder. The applicability
of any such third-party warranty will be determined by GAI-Tronics.
Services. Any services GAI-Tronics provides hereunder, whether directly or through subcontractors,
shall be performed in accordance with the standard of care with which such services are normally
provided in the industry. If the services fail to meet the applicable industry standard, GAI-Tronics will
re-perform such services at no cost to buyer to correct said deficiency to Company's satisfaction provided
any and all issues are identified prior to the demobilization of the Contractor’s personnel from the work
site. Re-performance of services shall be Buyer’s sole and exclusive remedy, and in no event shall GAITronics warranty obligations with respect to services exceed 100% of the total cost of the services
provided hereunder.
Warranty Periods. Every claim by Buyer alleging a defect in the goods and/or services provided
hereunder shall be deemed waived unless such claim is made in writing within the applicable warranty
periods as set forth above. Provided, however, that if the defect complained of is latent and not
discoverable within the above warranty periods, every claim arising on account of such latent defect shall
be deemed waived unless it is made in writing within a reasonable time after such latent defect is or
should have been discovered by Buyer.
Limitations / Exclusions. The warranties herein shall not apply to, and GAI-Tronics shall not be
responsible for, any damage to the goods or failure of the services supplied hereunder, to the extent
caused by Buyer’s neglect, failure to follow operational and maintenance procedures provided with the
equipment, or the use of technicians not specifically authorized by GAI-Tronics to maintain or service the
equipment. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE IN LIEU OF AND
EXCLUDE ALL OTHER WARRANTIES AND REMEDIES, WHETHER EXPRESS OR IMPLIED BY
OPERATION OF LAW OR OTHERWISE, INCLUDING ANY WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Return Policy
If the equipment requires service, contact your Regional Service Center for a return authorization number
(RA#). Equipment should be shipped prepaid to GAI-Tronics with a return authorization number and a
purchase order number. If the equipment is under warranty, repairs or a replacement will be made in
accordance with the warranty policy set forth above. Please include a written explanation of all defects to
assist our technicians in their troubleshooting efforts.
Call 800-492-1212 (inside the USA) or 610-777-1374 (outside the USA) for help identifying the
Regional Service Center closest to you.
(Rev. 10/06)
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