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GIA 370-420 VHF Page/Party Manual

370-400 UHF Page/Party

Made by: GIA
Type: Manual
Category: Receiver
Pages: 12
Size: 0.58 MB

 

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Pub. 42004-432E 

G A I

 

-

 

T R O N I

 

C S

 

®

A   H U B B E L L   C

 

O M P A N Y  

Model 370-400 UHF and 370-420 VHF 

Page/Party

®

 Radio Couplers 

GAI-Tronics Corporation  3030 Kutztown Road  Reading, PA  19605  USA 

610-777-1374  

  800-492-1212  

  Fax:  610-796-5954 

V

ISIT WWW

.

GAI

-

TRONICS

.

COM FOR PRODUCT LITERATURE AND MANUALS

 

Confidentiality Notice 

This manual is provided solely as an installation, operation, 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 

Product Overview 

The Model 370-400 UHF and 370-420 VHF Page/Party

®

 Radio 

Couplers allow a GAI-Tronics Page/Party

®

 system to 

communicate with a wireless radio system.  Radio users, 
located outside the facility at a remote location or inside a 
plant, can communicate with Page/Party

®

 users. 

The coupler works as a half-duplex system in that audio is only 
heard in one direction at a time.  The current audio path takes 
precedent over the system and the other audio path cannot 
engage until the current audio path releases control.  The audio 
path to the Page/Party

®

 system is gated by the carrier detect 

signal from the radio.  A VOX circuit that monitors the audio 
level on the page or party line, whichever is currently active, 
gates the audio path to the radio. 

The coupler converts audio levels from the Page/Party

®

 system 

to the appropriate radio signal levels that are then transmitted 
on a defined carrier frequency programmed into the radio.  The 
Page/Party

®

 Radio Coupler senses off-hook characteristics of 

the Page/Party

®

 system and routes party line audio or page line 

audio to the radio.  Party line audio takes precedence over page 
line audio. 

The coupler converts the radio signal to the appropriate signal levels for the Page/Party

®

 system.  The 

module has a relay output that activates during the presence of the programmed carrier frequency. 

Figure 1.  Outline of Model 370-400 

 


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Features 

85–264 V ac or 24 V dc power operation

hybrid circuitry to eliminate unwanted sidetone

individual volume adjustment to and from the radio

off-hook detection on party line

16-level VOX detection circuitry for monitoring page or party line audio

33-ohm termination internal to unit

eight selectable programmed radio frequencies

selectable high or low radio output power

relay output activated by radio received carrier frequency

Radio Frequency Programming 

The operating frequencies of the system must be programmed into the radio before the unit is installed in 
the field.  The radio programming software must be installed on a PC to program the coupler.  The radio 
programming kit is sold separately, P/N 19101-024. 

Radio Programming Software installation 

1. Place the CD in the computer CD-ROM drive.

2. Select the 

Start

 button; then select 

Run

.

3. At the prompt, type 

x

:\fscommand\setup.exe,

 where 

represents the drive letter that is associated

with your CD-ROM drive.

DTXL_PCPS

 icon should appear on the desktop display after successful installation. 

Opening the Station 

Remove the four screws from the front panel and remove the front panel from the rear enclosure. 

Connecting the Programming Cable to the Radio 

1. Unplug the Page/Party

®

 Radio Coupler’s 15-pin D-connector from the radio.

2. Connect the DTXP-PAC cable assembly’s 15-pin D-connector into the radio.

3. Connect the RJ11-style plug of the 9/RTC-PAS cable into the mating receptacle on DTXP-PAC

cable.

4. Connect the DB-9 to DB-25 adapter to the other end of the 9/RTC-PAS cable.

5. Connect the DB-9 connector of the cable assembly to the computer serial port.

6. Connect the red and black leads of the 9/RTC-PAS cable to a 12 V dc power source (battery or power

supply), observing the polarity (red +, black −).

 


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Programming the Radio 

1.

 

Make sure the radio to be programmed is powered and connected to the PC (as described above) 
before starting the programming software on the PC. 

2.

 

Start radio programming software on the PC. 

3.

 

Enter the receive (Rx) and transmit (Tx) frequencies for each channel.  To enter the frequency, select 
the channel, then the 

Edit

 button on the left. 

4.

 

Enter the Rx Frequency, Tx Frequency, and select a QC (Quiet Call) frequency or DQC (Digital 
Quiet Call) code, if desired. 

5.

 

After entering the frequency and optional QC or DQC, program the radio by selecting 

Radio > 

Program Radio

 from the tool bar. 

6.

 

After the radio is programmed (time bar disappears), disconnect the programming cable and 
reconnect the radio to the 69574-001 PCBA. 

Attaching the Front Panel 

After attaching the radio cable: 

1.

 

Place the front cover on the rear enclosure.  Do not to pinch any cables. 

2.

 

Secure the front cover using the four screws and washers provided. 

3.

 

Torque the screws to 10–12 in∙lb (1.13–1.36 Nm). 

Installation 

Important Safety Instructions 

 

Read, follow, and retain instructions

—All safety and operating instructions should be read and 

followed before operating the unit.  Retain instructions for future reference. 

 

Heed warnings

—Adhere to all warnings of the unit and in the operating instructions. 

 

Attachments

—Attachments not recommended by the product manufacturer should not be used, as 

they may cause hazards. 

 

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. 

 

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

—In 24 V dc systems: Under NO condition should this equipment be operated 

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. 

 


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Mounting the Enclosure 

1.

 

Mount the enclosure using the four 0.312-inch (8 
mm) diameter holes located on the mounting 
flanges with ¼-inch (M6) hardware.  The 
Page/Party

®

 Radio Coupler is not supplied with 

conduit or cable openings. 

2.

 

Remove the front panel and drill or punch entry 
openings in the rear section of the enclosure (see 
Figure 2 for suggested locations). 

There must be a minimum of ½ inch (13 mm) of 
material between entry holes.  GAI-Tronics 
recommends bottom entry only wherever 
possible. 

The standard mounting orientation (see 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.  When 
mounting the enclosure, use caution to avoid 
damaging the internal components. 

Antenna Installation 

Select an appropriate antenna based upon the 
frequency of the radio and connect it to the BNC 
connector on the top of the enclosure (see Figure 3). 

The antenna should be remotely mounted in a location 
that provides line-of-sight communication to the 
surrounding area.  Refer to the Specifications section 
for specific RF module frequency information. 

 

Figure 2.  Mounting Details and Wire Entry 

Locations 

Figure 3.  Antenna Connection 

 


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Field Wiring 

Refer to Figure 4, No. 69574-001 PCBA, for reference to connection locations. 

 

Figure 4.  No. 69574-001 PCBA with attached Radio PCBA 

Opening the Station 

Remove the four screws from the front panel and remove the front panel from rear enclosure. 

 


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Power 

The Page/Party

®

 Radio Coupler can be powered from the included universal ac power source or from a 

24-volt dc power source. 

ATTENTION

—Do 

NOT

 use both an ac and a dc power source at the same time. 

AC Power 

Field wire the universal ac power source to terminal block

 

TB1

1.

 

Attach #6 spade lugs to the power supply wires. 

2.

 

Connect the power supply wires to 

P1-L

INE

P2-

N

EUTRAL

, and 

P3-E

ARTH

N

OTE

:

  

Terminal block 

TB2

 is not used in this 

configuration. 

DC Power 

Field wire the dc power supply to terminal block 

TB2

1.

 

Attach #6 spade lugs to the power supply wires. 

2.

 

Connect the dc power supply wires to the 

24

 

V

 DC 

+

 

and 

24

 

V

 DC 

 terminals. 

N

OTE

:

  

Terminal block 

TB1

 is not used in this 

configuration. 

Audio and Control Signals 

The Page/Party

®

 Radio Coupler allows access to the audio lines along with relay outputs. 

Table 3.  P8—Page/Party

®

 Interface 

Pin Number 

Pin Name  Function 

P

AGE 

L2 

Bi-directional audio for 33-ohm page line 

P

AGE 

L1 

Bi-directional audio for 33-ohm page line 

P

ARTY 

L2 

Bi-directional audio for 33-ohm party line 

P

ARTY 

L1 

Bi-directional audio for 33-ohm party line 

 

Table 4.  P7—Carrier Detect Output 

Pin Number 

Pin Name  Function 

NC 

Normally closed connection of carrier detect 

COM 

Common connection of carrier detection 

NO 

Normally open connection of carrier detection 

 

Table 1.  TB1—Universal AC  

Power Supply Connections 

Pin Number  Pin Name 

I

NPUT 

L

INE

 

I

NPUT 

N

EUTRAL

 

E

ARTH

 

 

Table 2.  TB2—24 Volt DC Connections 

Pin Number  Pin Name 

24

 

V

 DC 

24

 

V

 DC 

− 

E

ARTH

 

 

 


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Settings and Adjustments 

Jumper Settings 

Radio Output Power, P5

—The radio can be configured for either high or low power output.  Default is 

high power output (5 W). 

Page Line Termination, P4

—The page line can be terminated locally or remotely in the system.  The 

default is for remote termination (open).  The party line is always terminated internally to the unit.  
Terminating the party line remotely will cause the off-hook detection circuit to fail. 

Selector Switches 

VOX Threshold 
Adjustment Switch, SW1: 

Adjust the threshold of the 
VOX using switch 

SW1

 to 

one of 16 levels to account 
for the system signal to 
noise level (see Table 5). 

Radio Frequency Selector 
Switch, SW2: 

Configure the radio for one 
of eight programmed 
frequencies using the 16 
position hex switch, 

SW2

.  

Each frequency is 
selectable using either of 
two positions on the switch 
(see Table 6). 

Level Adjustments 

Radio to Page/Party

®

 Volume Adjustment: 

Adjust the volume from the radio to the Page/Party

®

 lines 

using potentiometer 

R21

Page/Party

®

 to Radio Volume Adjustment: 

Adjust the volume from the Page/Party

®

 lines to the radio 

using potentiometer 

R42

Attach the Front Panel 

1.

 

Place the front cover on the rear enclosure. 

2.

 

Secure the front cover using the four screws and washers provided. 

3.

 

Torque the screws to 10–12 in∙lb (1.13–1.36 Nm). 

Table 6.  SW2—Radio 

Frequency Selector Settings 

Radio 

Channel 

Selector 
Switch 
Position 

0 or 8 

1 or 9 

2 or A 

3 or B 

4 or C 

5 or D 

6 or E 

7 or F 

 

Table 5.  SW1—Nominal VOX 

Threshold Settings 

Selector 

Switch 

Position 

VOX 

Threshold 

(mV) 

380 

350 

330 

300 

275 

250 

225 

200 

190 

160 

140 

110 

90 

60 

40 

20 

 

 


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Operation 

The Page/Party

®

 station operator controls the coupler’s connection to the page or party line by the off-

hook and page conditions. 

 

When all stations are on-hook, the Page/Party

®

 Radio Coupler is connected to the page line. 

 

When any station is off-hook on the designated party line, the Page/Party

®

 Radio Coupler is 

connected to that party line. 

 

When the Page/Party

®

 station operator lifts the handset and presses the handset pressbar, the 

Page/Party

®

 Radio Coupler is connected to the page line. 

Calling a Radio Operator from the Page/Party

®

 System 

For paging and subsequent party line conversation: 

1.

 

Lift the handset and select the dedicated party line using the five-position rotary selector switch. 

2.

 

Press the handset pressbar to connect to the page line in the radio coupler and page the desired 
individual. 

The page is heard over the Page/Party

®

 system and the radio frequency.  After the page: 

3.

 

Release the pressbar to connect the station to the party line in the radio coupler and wait for a 
response. 

The radio operator then responds by keying the radio and talking. 

The resulting communication is half duplex, meaning the person currently talking has control of the 
conversation.  The other operator must wait until the first person has finished talking.  After the 
conversation is complete, the Page/Party

®

 operator should place the handset back on-hook. 

Calling a Page/Party

®

 Operator from a Radio 

For paging and subsequent party line conversation: 

1.

 

Turn on the radio and activate the push-to-talk (PTT) button. 

2.

 

Page the desired individual.  The Page/Party

®

 station operator lifts the handset, selects the dedicated 

party line using the five-position rotary selector switch and responds to the radio operator. 

The resulting communication is half duplex, meaning the person currently talking has control of the 
conversation.  The other operator must wait until the first person has finished talking.  After the 
conversation is complete, the Page/Party

®

 operator should place the handset back on-hook. 

Specifications 

AC/DC Input 

AC Power Supply 

Input voltage ............................................................................................ 120/230 V ac (nominal), 50/60 Hz 

Current draw @ nominal 120 V ac .................................................................................................... 270 mA 

Current draw @ nominal 230 V ac .................................................................................................... 150 mA 

DC Power Supply 

Input voltage ....................................................................................................................................... 24 V dc 

Current draw @ nominal 24 V dc ............................................................................................................. 1 A 

 


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Audio 

33-ohm output with +/−1.5 kHz deviation, narrowband ......................................... 1.5 V 

RMS

, factory aligned 

 

2.8 V 

RMS

 maximum 

Distortion .............................................................................................................................. <1.5% @ 1 kHz 

Radio output deviation with 1.5 V 

RMS

 from 33-ohm line ................ +/−1.5 kHz narrowband, factory aligned 

VOX threshold ................................................. (see Table 5), Nominal VOX Threshold Settings, on Page 7 

VOX activation time ........................................................................................................................... <50 ms 

VOX hold time ......................................................................................................................................... >1 s 

Off-Hook Monitoring 

Activation time.................................................................................................................................... <50 ms 

Deactivation time ................................................................................................................................ <50 ms 

Relay Outputs 

Maximum load ........................................................................................................................ 2 A @ 30 V dc 

 

0.5 A @ 125 V ac 

Mechanical 

Construction/finish .................................................... 16-gauge cold-rolled steel; safety orange powder coat 

Mounting ............................................................... wall or column, four 0.31-inch (7.8 mm) mounting holes 

Dimensions ............................................................. 12.0 H × 8.0 W × 5.0 D in (304.8 × 203.2 × 127.0 mm) 

Shipping weight ................................................................................................................... 10.5 lb (4.76 kg) 

Net weight .............................................................................................................................. 9.5 lb (4.31 kg) 

Environmental 

Operating temperature range ...............................................................................................−20 ºC to +60 ºC) 

Relative humidity ......................................................................................... non-condensing 85% maximum 

RF Module 

General 

Frequency range ............................................................................................................. VHF: 154–174 MHz 

 

UHF: 450–470 MHz 

Antenna impedance ................................................................................................................................. 50 Ω 

Encoder/decoder .................................................................................................... CTCSS tone, DCS digital 

Receiver (measurement procedures made per ANSI/TIA/EIA-603) 

Sensitivity (12 dB SINAD) ................................................................................................................ 0.25 μV 

Inter-modulation ........................................................................................ VHF @ −67 dB; UHF @ −67 dB 

Transmitter (measurement procedures made per ANSI/TIA/EIA-603) 

RF output ..................................................................................................................................... 2 W or 5 W 

Spurious and harmonic emissions ................................................................................ < −20 dBm maximum 

 


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Approvals 

FCC Identifier .............................................................................................................. VHF: AIERT 17–145 

 

UHF: AIERT 17–445 

FCC Compliance .................................................................................................................................. Part 90 

IC Certification ........................................................................................................VHF: 1084A-RIT 17145 

 

UHF: 1084A-RIT 17445 

Frequency Restrictions 

Certain transmit and receive frequencies within the coupler’s range are unavailable.  Refer to the tables 
below for these frequencies.  Do not attempt to program the coupler to these frequencies. 

Table 7.  VHF (138–174 MHz) Restricted Frequencies 

Receive 

(MHz) 

Transmit 

(MHz) 

Receive 

(MHz) 

Transmit 

(MHz) 

Receive 

(MHz) 

Transmit 

(MHz) 

Receive 

(MHz) 

143.9900 

143.9900 

158.3900 

158.3900 

172.7900 

172.7900 

143.5425 

143.9925 

143.9925 

158.3925 

158.3925 

172.7925 

172.7925 

143.5575 

143.9950 

143.9950 

158.3950 

158.3950 

172.7950 

172.7950 

157.9425 

143.9975 

143.9975 

158.3975 

158.3975 

172.7975 

172.7975 

157.9575 

144.0000 

144.0000 

158.4000 

158.4000 

172.8000 

172.8000 

172.3425 

144.0025 

144.0025 

158.4025 

158.4025 

172.8025 

172.8025 

172.3575 

144.0050 

144.0050 

158.4050 

158.4050 

172.8050 

172.8050 

 

144.0075 

144.0075 

158.4075 

158.4075 

172.8075 

172.8075 

 

144.0100 

144.0100 

158.4100 

158.4100 

172.8100 

172.8100 

 

 

Table 8.  UHF (450–470 MHz) Restricted Frequencies 

Receive 

(MHz) 

Transmit 

(MHz) 

460.80000 

460.78750 

461.23750 

460.79375 

461.24375 

460.80625 

461.25625 

460.81250 

461.26250 

 

 

 


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(Rev. 10/06)

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 GAI-
Tronics 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.