User's Manual

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This manual is divided into four sections. The first is a description of the system hardware. The
second describes radio interference suppression methods. The third lists device specifications.
The fourth covers the recommended operating and maintenance procedure.
1.0 HARDWARE DESCRIPTION.
The model RPTR315 high-speed smart repeater can be used to extend the range or
enhance the coverage of standard Holatron systems operating on 315 MHz. The
repeater accomplishes this by receiving a Holatron digital signal and retransmitting it if it
is correctly formatted. Only Holatron digital signals will be retransmitted. Other signals
on 315 MHz or other frequencies will be ignored. Multiple repeaters may be arrayed
equidistant from the Holatron transmitter to provide enhanced coverage with
simultaneous retransmissions, or they may be arranged in a linear cascade to multiply
the effective range of the transmitter. For example, one repeater midway between
transmitter and receiver will double the transmitter’s range in that direction. A repeater
located at distance D from the transmitter, and a second located at distance 2D will
triple the transmitter’s range (extend it to 3D), and so on, with a maximum cascade of 4
repeaters possible for a five-fold extension of range. Combinations of enhanced
coverage arrays and linear cascades are possible, provided no cascade contains more
than 4 repeaters. These repeaters are also useful for extending coverage around
corners of conductive buildings, over hills, and onto rooftops.
In addition to filtering out non-Holatron signals and incorrectly formatted digital signals,
the repeater can be set to cause only Holatron signals on a selected digital channel to
be retransmitted, or optionally to retransmit any of 12 available channels. The repeater
will retransmit any proprietary system code on its selected channel(s). Repeater
performance is optimum if only one channel at a time is transmitting. It may degrade if
multiple channels are transmitting simultaneously.
Retransmission is performed by a highly sensitive narrow band (superhetrodyne) digital
radio transceiver that receives encoded radio commands from standard 315 MHz
Holatron transmitters and retransmits them through a common antenna. A
microcomputer decodes and error checks the received signals in real-time before
initiating retransmission. This system is designed to be used for remote control
applications where speed and high reliability are critical. When used with the Holatron
model XMTR12C, RFLS-6HSXT series, or RFLS-12XT series remote control
transmitters, a single repeater will typically double the transmitter’s range from ½ mile to
one mile (line of sight), provided there are no intervening conductive objects such as
automobiles, chain-link fences, etc, in the receive and transmit paths. Range increases
as the repeater is elevated above earth or other conductive objects (such as aluminum
bleachers). Range will be even greater when receiving and transmitting over water.
The repeater is environmentally sealed when its hinged lid is closed and latched, and it
may be operated in this configuration under heavy rainfall and other adverse
environmental conditions, but it is not designed to be submerged under water.