User Manual

RECEIVER JAMMING ALERT
Any signal received on the frequency will cause the receiver to lock-on, whether it is local
electrical interference, a transmission with a different family code, or a ‘wanted’ signal from a
transmitter on your own family code.
However, if the ‘Maxi-MINDA’ receiver is ‘jammed’ by a continuous unrecognized signal, after 5
seconds (factory re-programmable for longer periods) it will produce a series of rapid audible
beeps. This allows the user to move to an interference-free location. As soon as the interference
clears the beeps will cease.
LOSS-OF-SIGNAL ALERT
If an RX-500 ‘Maxi-MINDA’ receiver has had a Loss-of-Signal Threshold time programmed, then
when an initial ‘Green’ transmission is received from any of its associated transmitters one of four
internal pre-programmed time clocks will start counting. Each subsequent ‘Green’ transmission
from that same transmitter unit will reset that time clock to zero. If, however, the pre-set threshold
time period elapses
before
another ‘Green’ signal has been received then the appropriate green
LED on the receiver will begin to flash and a ‘Lost Signal’ audible alarm will be produced.
Until the receiver operator pushes the ‘Reset’ button to clear the audible and visual alarms, the
‘Lost Signal’ warning alert tone will continue to be repeated at pre-programmed (Repeat Time)
interval(s).
If different transmitter units (but with the same Family Identity Code) are then received, other time
clocks commence operation independently in the same way as described above. If a valid ‘Red’
alarm signal is received from any of its associated transmitters the ‘Maxi-MINDA’ receiver will, of
course, generate all of its normal audible and switching alarms.
The threshold time that has to elapse between successive green transmissions before the
receiver sounds a ‘Lost Signal’ alarm, and also the repeat time between each alarm signal are
both programmable, independently, for each of the four Unit Identities.
As supplied, unless a customer has requested otherwise, a ‘Maxi-MINDA’ receiver normally has
these alarms inhibited in order to prevent possible operator confusion. The next section on
Confidence Signalling explains how this feature can be used to good effect in an operational
situation.
CONFIDENCE SIGNALLING
A ‘MINDA’ intelligent transmitter (TX-500 keyfob or the TX-600 Belt unit) can be programmed so
that for any or all of the four identities it can send a regular (Green) confidence transmission as
an “I’m here and OK” signal.
Here's an idea:
If an RX-500 ‘Maxi-MINDA’ receiver has its ‘Green Alarm’ switch set to ‘Off’ and has been
programmed with a suitable Loss-of-Signal Threshold time (see the ‘Loss-of-Signal’
paragraph above), the following scenario becomes possible:
In a situation where an intelligent ‘Re-MINDA’ transmitter and a ‘Maxi-MINDA’ receiver are
being used to protect a person close-by but out of sight, the regular (Green) confidence
transmission will keep the receiver silenced all the while it is present. If the transmitter
moves out of radio range, its battery fails, or it is otherwise disabled the receiver will sound a
‘Lost Signal’ alarm as soon as the signal has been missing for the pre-programmed period of
time. This enables, for example, a VIP to be guarded at night by a bodyguard in an adjoining
room, or a person going into a potentially hazardous situation to be protected by a back-up
team in a vehicle close-by. An intelligent MINDA transmitter can send confidence signals