time, thereby dramatically extending 'MINDA''s operating endurance before a change of battery is
required.
The slight penalty for this feature is that an incoming alarm transmission must last long enough to
catch the receiver during one of its 'on' periods to ensure that it is recognized and decoded. In
practice this should not cause any problems provided that the transmitter button is held down for
at least one second. This short imposed delay also reduces the chances of accidental false-
alarms when the transmitter is carried loose in a pocket.
Battery
The 'MINDA' RX-400 receiver uses a 9 volt Alkaline battery (Duracell MN 1604 or equivalent)
which should be capable of providing power for more than 1000 hours. The actual battery life
obtained will depend very much on the number of alerts received whilst it is being used.
To replace the receiver battery, slide open the battery-box cover, lift out the battery and carefully
remove the connector. Inspect the connector and, if necessary, adjust the position of the spring-
leaves to ensure good contact, and fit it on to the new battery. Dress the leads to one side of the
new battery and slide the battery-box cover on until it clicks into place.
TRANSMISSION RANGE.
When using the 'MINDA' system over a line-of-sight path, a range of greater than 100 yards is
likely, whereas in a busy street, hotel or station the range will be noticeably less.
It is recommended that, before using a 'MINDA' system in a 'live' operational situation, a few tests
are carried out in the location(s) of interest to confirm consistent and reliable operation.
GETTING THE BEST RESULTS FROM 'MINDA'.
To maximize the effectiveness and communications range of a 'MINDA' alarm system there are
some simple 'tricks' that really do work and which, on all occasions when it is practical and
convenient to use them, can be used to enhance its performance. These are....
When carrying and using the 'MINDA' receiver, try to allow the antenna wire to hang freely from
the receiver case and also remember that audible warnings from the built-in 'beeper' may be
somewhat muted if the small hole on the label side of the unit is significantly obstructed.
Remember that the human body is largely comprised of water. When using a transmitter, face in
the direction of the receiving location so that your own body does not obstruct the emitted radio
signal. If possible, hold the transmitter away from your body so that there is free space around its
antenna. NEVER shorten or wrap up the transmitter antenna wire.
When using a 'MINDA' transmitter or receiver inside a vehicle, try to ensure that its antenna is
kept above the window line to ensure that signal levels are maximized.
If you are in the street and communications get difficult, try holding the unit just above the roof of
a parked car with the antenna wire pointing upwards. By doing this the metal roof of the vehicle
will act as a counterpoise earth and so enhance the signals.
UNITED STATES OF AMERICA FCC COMPLIANCE: