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* Com port keying for your eQSO Gateway...
Posted Apr 09, 2003 - 07:56 AM
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Hardwired If your eQSO Gateway software is currently using continuous tone or VOX to trigger your PMR446 Gateway, may find that you are missing out o­n the first few seconds of each over and the courtesy tone after you have finished transmitting, especially if your radio is as slow to "open up". Click the link above to find out about using a com-port keyer instead.....

The solution to this is to use the Com port keying feature of the RF Gateway.

Parts required:-

4N25 - Maplin AY44X 4N25 0.49
D1 = 1N914 or 1N4148 Maplin QL80B 1N4148 0.08

R1 = 1K Ohm, 1/4 Watt
C1 = 0.01 Microfarad, 50 Volt
DB9 connector

Circuit Diagram:-

I used strip board for this and managed to find a DB9 connector housing large enough to accomodate the circuit


The next step is the hardest part if your radio doesn't support a PTT button o­n the headphone/mic accessory.

I had to open the radio and solder two wires to the PTT connectors o­n the radio circuit board so that when these are shorted out the PTT is activated o­n the radio.

Doing this required tracing the PTT switch to the nearest vias (the holes in the circuit board that connect the different layers) as the switch contacts were extremely small and too difficult to solder.

The next step is to change the method of keying your radio in the eQSO gateway software:-

Once these settings are complete you can disable the VOX feature o­n your radio and you are ready to test (it's a good idea to close eQSO down and restart it. Then double check that settings have been saved).

Now is a good idea to press the apply button a few times to check that your radio is returning to recieve mode properly after transmitting before re-connecting to

Beam with delight as you now get rid of all the whitespaces infront of the "K" courtesy tone and never miss a tone!!

The beginnings of QSO's have never been so good.

Dr. Rob (With credit to AE0Q and Dean)

Com port keying for your eQSO Gateway... | Login/Create an account | 1 Comment
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Re: Com port keying for your 446 Gateway... (Score: 1)
by Rob on Apr 27, 2003 - 12:40 AM
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Looks like the Binatone Roamaround 100 radio that I am using can be configured for external PTT without having to open the radio up at all
If you press the up button whilst powering up it will support keying via the ear and mic sockets o­n the radio
I will set this up and report back
Thanks to Wesley for pointing this out

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