Wireless Door Alarm System
53
114A3873.D rev. 7-2017
Wireless Repeaters
PTI Wireless Repeaters can boost the signal from door transmitters
when they are too far away from the receiver, located in high
noise areas, or installed where objects interfere with the signal.
The actual number of repeaters needed will vary from site to site
depending on several factors.
Repeaters must be installed near a standard 120 V outlet and each
repeater has a low voltage power pack with a rechargeable battery.
The battery provides backup power for the repeater in the event
of a power failure.
How Many Repeaters are Needed?
In ideal conditions the receiver can pick up signals from door
transmitters up to 1,500 feet away. For most installations,
particularly sites with metal construction, at least one repeater
should be installed for any door transmitters located over 400 feet
from the receiver,
Repeaters should be mounted so that every transmitter has multiple
transmission paths to the receiver. This kind of redundancy improves
system integrity in the event of any temporary interruptions to a
transmission path on the site.
Repeaters can “hopscotch” messages from one to another, so
that if any one repeater cannot talk directly to the receiver, the
message will be transferred through other repeaters until it gets
to the receiver.
Repeaters transmit at a much higher power than door transmitters,
allowing the repeaters to be spaced much further apart than
transmitters. The repeater(s) location is determined by the
placement of the transmitters.
There are two methods for calculating the number of repeaters
needed for a site: site survey and post-installation test. Each
method varies in complexity and equipment required.
