Pub. 42004-019D
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 370-201
Interface Amplifi er Assembl y
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.
General Information
The Model 370-201 Interface Amplifier allows GAI-Tronics’ Page/Party® systems to interface with
standard private telephone net works. This unit inter c onnects two voice circuits that are dissimilar in
voltage and/or impedance. The interface amplif ier is not just a matching transformer; it also includes a
gain a djustment t hat compens ates f or differ ences in signal levels, or permits use with a range of signal
level. It can also be used in other paging systems.
Consisting of:
Model No.
370-201 371-201 372A
Amplifier Enclosure
Installation
WARNING
Do not install the Model 370-201 in hazardous areas; such installation may cause a safety hazard and
consequent injury or property damage.
Enclosure Placement
Installation, adjustment, and maintenance of the Model 370-201 Interface Amplifier Assembly is easier if a
Page/Party
panel nea r a Page/Party
Assembly.
®
handset station is mounted close by. The Model 370-201 should be mounted on a wall or
®
handset station and within 300 feet of the Model 305-001 Line Balance
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, and then feed the wiring through the condu it into t he enclosure.
When wiring t he s tat ion, follow the wire colors carefully. The color s noted in Figure 2, Figu re 3, and
Figure 4 correspond to GAI - Tronics 60038 Series cable. The wires should be spade-lugged and connected
properly to the termina l block. An improper terminat ion may resu lt in diminished station p erformance.
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Wiring a Model 370-201 between a Page/Party® System and Telephone Lines
GAI-Tronics 60038-101 eight conductor ca ble is r ecommended for 372A enclosure connections. This
cab l e contains a 1 4 AWG twisted pair f or power c onnec tions (2 4 V dc or 120 V ac), a single 14 AWG
ground wire, an 18 AW G pair for G AI - Tr onic s pa ge or pa rty line connections, and three spa re 18 AW G
wires ( one t wis ted pair plu s single wire) . If ot her cable is us ed, make sure that the au dio wires
®
(GAI-Tronics Page/Par t y
line) ar e t wis ted pairs; shielded pair s are not necessary.
Figure 2, Figure 3, and Figure 4 show the various wiring configurations and the suggested wire colors from
the GAI-Tronics 60038-101 cable. If a Model 370-201 Interface Amplifier Assembly is used, TB1 5 and 6
®
can b e connected to either the pa ge line or to a par ty line on a GAI - Tronic s Page/Party
system and
termina l 7 and 8 are connected to the incoming telephone line.
OTE: Any party line can be s elected.
N
Figure 2. 120 V AC 50/60 Hz Power Connection
Figure 3. 24 V DC Connect ion with Negative Gr ound
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Figure 4. 24 V D C Connection with F loating Power Supply
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Checkout and Adjustment
1. After the Model 370-201 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 Interface. Make sure that
the GAI-Tronic s sidetone level (the amount of transmitted signal from the microp hone t hat is heard in
the receiver) is not s ubstant ially affected when the inter f ace is connect ed to the system.
If osc illation, distortion, or exc es sive sidetone occurs , check the M odel 370 installation wiring and
ensure that the 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 370-201 has been connected to the P rivate Bra nc h Excha nge (PBX) extension, initiat e
a call to the P B X ex tension connected to the Model 370-201 Interface and verify the ability to carr y on
®
a conversation between the t elephone s ystem and t he Page/Party
system.
NOTE: The Model 370-201 Interface Amplifier is designed to connect a line fr om a PBX t o a
®
GAI-Tronics Pa ge/Pa rty
system. It is designed to match impedance and voltage levels of the 600-ohm
0 dBm telephone networ k and the 33-ohm 18 dBm GAI- Tr onic s system. This unit is not designed to b e
connected to the Pub lic Telephone switc hed Net work and is not FCC P art 68- approved.
3. After system basic operation has been verified, adjust the Model 370-201 Interface if necessary. First,
establish communications between the PBX and the Page/Party
®
handset station nea rest the interf ace.
Follow Sub-steps A through C to complete the Model 370-201 adjustment. Adjustments are made
thr ough the plu gged access 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 370-201 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
PBX is comparab le t o normal voice levels on the GAI - Tronic s 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 t he P B X line is c omparable to normal system voice levels. See note below.
OTE: If the LINE TO GTC and/or the GTC TO LINE contr ols ar e s et too high, oscillation and
N
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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Model 370-201 Applications
Two-Way Com munic ation fr om a Telephone to a Page /Pa rty
®
Line
In Figu re 5, the communication is initia ted by the telephone system. Once p arty-line communicat ion is
esta blished, two-way c ommunication can occur. This application requires c onversa tions t o b e p rearranged.
Figure 5.
One-Way Pa ging betwe en a Tele phone and a Pa ge/Pa rty® System
Model 370-201 may be used with a customer-provided page adapter (paging port) to interface telephone
PBX p aging. This feature permit s one-way paging fr om your telephone system to the p age line of the
®
Page/Party
system. See Figure 6, noting that the direct ion of the arrows repr esents t he f low of
communication. S ee t he O ne-way Operation section.
Figure 6.
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One-Way Operation
If the Model 370-201 Interface is only used for one- way communication, jump er wires loc ated on the
Model 370-201 two-way amplifier printed circuit card (69056-001) can be removed to improve amplifier
stability and per f ormance.
If the Model 370-201 is used for one-way communications ONLY, complete the following a djustments :
1. The telephone line/PBX paging por t, cut Ju mper W-4.
2. The GTC s ys tem page line to t elephone/ PBX Line or Central Amplif ier, cu t Jumper W-3.
When the Model 370-201 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.
One-Way Pa ging from a Pa ge/Pa rty® Syste m to A nothe r Pa ging Sys tem
Model 370-201 may be used to connect the pa ge line of a Page/Party® system into another page system
(similar to a c ent ral amplifier s ystem). F igure 7 illu str ates the flow of communicat ion f rom a GAI- Tronic s
®
Page/Party
page line to a central amplified system page line. S ee the One- way Operation section.
Figure 7.
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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 Interface can also be used with the following:
• Mine Page Telephones
• Two Model 370-201 Interface Amplifier Assemblies can be used to connect two Page/Party
®
systems
together through a telephone line or a simple twisted pair of wires.
• 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 371-201 is used
to interface Page/Party
®
syst ems to standard telephone systems.
Replacement Parts
Part No. Description 371-201 372A
61508-010 Harness Assembly
12535-001 Enclosure Hardware Kit (5 sets)
12508-002 Ca ptive Screw Kit
69056-001 PC BA, Two-way Amp (GTC-TEL 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
Q Q
Q
Q
Q
Q
Q
Q Q
Q
Q
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Specifications
Audio Characteristics
Line Terminals Output: GAI-Tronics Terminals Input; 1000 Hz
Load Impedance................................................................................................................ 600-1000 ohms
0.15 uF in parallel
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% maximum
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
Frequency response................................................................................................ 250-4000 Hz (0, -4dB)
Harmonic distortion.................................................................................................................. 0.6% max.
, 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
RMS
mini mum
RMS
RMS
, min.
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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