User Manual
external power is getting to the receiver by measuring the voltage on the connector which should
be a D.C. voltage in the range 10-16 volts. If this voltage is not present, the leads (and AC power
supply unit if used) should be examined to find and rectify the fault. If the receiver still does not
function with the external power connector removed, replace its internal 9 volt battery by a known
good one and try again.
• Replace any other cables and connections, one at a time to see if the fault re-occurs and, if it
does, investigate the cause accordingly.
• Return the faulty unit for workshop test and/or repair.
RECEIVER SPECIFICATION
Operating frequency:
418.00 MHz nominal
Overall freq. accuracy:
± 100 kHz
Sensitivity:
Typically -110dBm for reliable data decoding
Max. receiving range:
Typically 100 yards when using a ‘MINDA’ transmitter but depends on local
environment.
Internal power source:
9 volt 550 mA/hour alkaline battery (MN1604)
Current drain:
< 300 µA average (Batt. Economizer/no signal)
(on internal battery) < 20 mA whilst actually receiving a signal
Current drain:
< 50mA (Batt. Economizer disabled/no signal)
(on external battery) 60 - 150mA whilst actually receiving a signal
Internal battery life:
Depends on number of alarm signals received
External power sources:
1) 10 - 16 volts D.C. (negative ground)
Operating temp. range:
-10 to +55 degrees Celsius
NOTES ON ‘MINDA’ SYSTEM CODING
All ‘MINDA’ systems operate on a frequency of 418MHz in the UHF band. The operating radio
frequency cannot be changed to suit a specific customer’s needs.
Each ‘MINDA’ system, when supplied to a customer, will have already been programmed at time
of manufacture with a common default ‘Family Identity Code’ (hexadecimal 94) enabling it to be
used with any other of the standard ‘MINDA’ products.
The Family Identity Code for a particular group of ‘MINDA’ units can easily be re-programmed by
returning all of the equipment to Tactical Technologies Inc., or, if a ‘MINDA’ computer interface
package has been purchased, by a suitably skilled user.
If the security offered by only 255 different codes is considered to be inadequate then the
intelligent TX-500 or TX-600 transmitters can be re-programmed to utilize a much more
sophisticated Family Coding system that offers a choice of billions of unique codes. This option is
only practical so long as the customer does not need to operate a mixture of Intelligent (TX-500)
and ‘Dumb’ (TX-400) transmitters into the same RX-500 ‘Maxi-MINDA’ or RX-400 ‘MINDA’
receiver.
For a ‘MINDA’ system to operate with, and recognize up to four independent transmitters, the
Family Identity Code of the receiver and transmitter(s) all have to match
and
each of the
transmitters must have a different Unit Identity (1,2,3 or 4). The Unit Identity of a ‘MINDA’ TX-500
intelligent transmitter is user-switchable and can easily be changed - see the TX-500 ‘MINDA’
Operating Instructions for more details. The Unit Identity of a ‘dumb’ key-fob transmitter (TX-400)
is set during manufacture and cannot be changed by the customer. Unless each transmitter has
its own individual identity, the receiver will be unable to identify the particular unit .
WHAT IS ACTUALLY TRANSMITTED