ZETRON 37-MAX, Installation Manual

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1. INTRODUCTION
OVERVIEW
The Zetron Model 37-MAX Repeater Pal is a high capacity, remotely programmable,
community repeater controller. It provides individualized repeater service to up to 154
different customer groups using CTCSS tone and Digital Coded Squelch (DCS) signaling.
The Repeater Pal connects to a receiver and transmitter providing CTCSS/DCS decode,
regenerated CTCSS/DCS encode, repeat audio processing, selectable system functions and
per-user functions. It will convert any station capable of full duplex operation into a fully
featured community repeater. The Repeater Pal is an ideal replacement for older tone panels,
eliminating time consuming trips to remote repeater sites, as well as providing a high
subscriber capacity growth path for the future.
The compact size of the Repeater Pal is ideal for low power repeater packages constructed
from a pair of suitable mobile radios.
Complete CTCSS/DCS Coverage
The Repeater Pal has the capacity for supporting up to 154 separate user groups on a single
channel, which is ideal for scan based trunking systems, roaming, or seasonal users.
The panel is equipped with ToneLock decoding, an exclusive Zetron feature that eliminates
dropouts resulting from weak, fading signals or high modulation levels. The usable range of
the repeater is not limited by the decode performance of the repeater tone panel when the
Repeater Pal is in control.
The 37-MAX recognizes when a subscriber unkeys with a reverse burst, or the DCS turn-off
code, and silently mutes the repeat audio path to prevent bursts of “squelch tail” noise from
being repeated on the channel. The Repeater Pal also supports squelch tail elimination by
dropping its encode a short time before dropping its carrier when the station is unkeyed. This
ensures that listening radios mute without any annoying noise burst.
High quality audio processing circuits in the Repeater Pal are designed to make its repeater’s
audio quality rival the very best panels on the market.
Features You Expect in a Zetron Panel
Aside from providing the decode and encode performance of a larger tone panel, the Model
37-MAX has many of the other features of the “big guys” as well.
The Morse code Station ID feature is fully field programmable. The ID call sign can be up to
eight characters in length. The panel can be set to wait for the next transmission to ID or to
ID automatically whenever the ID interval timer reaches zero. The duration of the ID interval
is also field programmable, as is the speed at which the ID is sent.