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Connector cable
To make your M1 work correctly with your two-way radio system you must first make
a cable to connect your radio to the Beatrice M1.
You will need a soldering iron, cable snippers, spare wire, the two connectors and
some shielded cable (2 pairs).
Most Motorola radio systems use a dual 3.5mm + 2.5mm combo jack for external
headsets with the earphones on the larger 3.5mm jack and micr PTT on the
2.5mm jack.
Sometimes referred to as the “M1” connector. Note: the 2.5mm jack is
not a standard 2.5mm plug.
To connect your radio, you will need to obtain a compatible connector. In most cases
the easiest way to obtain one is to buy a cheap radio headset and snip the wire off at
the headset end.
When you have the correct adapter for your radio, you need to obtain a male 9-way
D type plug connector which will connect to the Beatrice M1. These are widely
available and cheap to buy.
There are a few different methods of push to talk that your radio system may use.
The most common type tends to be
‘relay in series’ with the microphone to key PTT.
Note: the relay is located in the internal circuitry of the Beatrice M1.
The majority of radio’s should work with the following three example, so you will
need to trial and error in order to find the solution that works for you.
The dip switch on the side of the unit will control level attenuation and the DC path
for the microphone. Make sure to set accordingly or experiment to get a suitable
level for your radio.
3.5mm Mono Earphones jack
2.5mm Micr
PTT jack
