Specifications

Overview
97
Radio System
Overview
This section provides information that relates to the radio side of the paging terminal. It
contains detailed connection listings for the radio station connectors located on the
backplane of the paging terminal that are used to make the connections to the radio
transmitter equipment. It also tells how the station cards operate and how to configure the
jumpers on a station card and make any necessary adjustments. This section also describes
the different paging terminal/radio transmitter hook-up arrangements, including remote
control operation. Illustrations are provided to support the hook-up descriptions.
This section should help you and your radio expert provide an appropriate radio
connection. Engineers at Zetron are available to help you through the installation process.
Different types of radio systems can be connected to the Model 2100/2200, requiring
specific interface card settings; analog, analog + digital, multi-site zone control, and
simulcast.
General System Design
As listed in the Operating and Programming manual (025-9034-001), the tone range for
the various analog paging formats covers a wide range of frequencies, often with tones of
very short duration. This places a good deal of importance on audio pre-emphasis/de-
emphasis in a radio to guarantee flat tone transmission. A single pole filter present in
many microphone circuits pre-emphasizes the tones generated by the terminal to a point
where decoding by a pager is not possible. For more information on tone de-emphasis,
refer to Station Card Removal/Installation on page 105, specifically the subtopic Jumper
Settings on page 106.
FM Transmitter deviation for analog paging should be set for about 3.5KHz to maximize
paging range, but not much more to avoid tone clipping distortion which can cause
unreliable pager decoding. Also be careful that any link equipment between the Model