GAI-Tronics 305-002 Line Balance Assenbly (600-ohm) - Manual

Pub. 42004-323C
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374  800-492-1212  Fax: 610-796-5954
V ISIT WWW . GAI - TRONICS . COM FOR PRODUCT LITERATURE AND MANUALS
G A I - T R O N I C S ® C O R P O R A T I O N
A H U B B E L L C O M P A N Y
Model 305-002
600-Ohm Line Balance Assembly
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 GAI-Tronics Model 305-002 Line Balance Assembly is designed to properly load both the page and
party line circuits of a GAI-Tronics 600-ohm Page/Party
® communication system. One line balance
assembly must be installed in each system. The line balance assembly may be used in single or multi (up
to five) party line systems.
Installation
There are three primary considerations in determining the location of the line balance assembly:
1. It should be near the electrical center of the system.
2. It should be adjacent to an indoor station in a relatively quiet area.
3. It should be no more than 26,400 feet (5 miles or 8 km) from the most distant station, when used with
GAI-Tronics’ standard cable. For larger systems or when non-standard cable is to be used, please
contact a GAI-Tronics representative for further information.
Mounting can be accomplished by either suspending the assembly by a 1-inch conduit nipple (not
supplied) from the bottom of an indoor wall station or by using the mounting ears located on the box.
Connect one twisted pair for the page circuit and a similar pair for each party line between the terminal
blocks of the line balance assembly and the associated indoor wall station.
Adjustment
To set the control for proper page circuit loading and to minimize the receiver sidetone, complete the
steps listed below. Sidetone is the amount of signal returned from the microphone to the receiver element
of the handset, i.e., how loudly the user hears his or her own voice. This adjustment needs to be made
during the initial installation of the system. However, if more than ten handset stations or speaker
amplifiers are added or deleted in the system at any time, readjust the page circuit loading.