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Author Topic: Soundcard inteface  (Read 4605 times)
HAM2BE
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Posts: 8


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« on: April 15, 2001, 11:54:11 AM »

Hi all,
       Has anyone attempted to interface an older hand held to a soundcard?  I have an Icom IC-2GAT and I would like to interface it to a laptop.  The audio out from the radio to the laptop is no problem, but the keying circut is the hard part.  As I am sure you are aware, the radio is keyed by completing the mic circut.

Would it be possible to have the computer close a low current relay to complete the transmit circut, or is there a better and more efficent way to do this? (I know, buy a new radio, and do it the easy way, but where is the fun in that?)  Any and all help is appreciated!

73,
Tim
KG4MQD
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KA1DBE
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Posts: 122




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« Reply #1 on: April 16, 2001, 09:23:36 AM »

Well, as most handheld radios go, most of them are keyed the same......(except kenwoods??).  Most of the sound card software that I have seen also uses an optional keying circuit that plugs into your com port.  It only uses a capactitor, resistor, and a transistor.  I am sure that you could build the whole interface in the DB-9 connector.

I don't have the exact schematics but I am sure your program help files contain it or you could check any one of the numerous PSK-31 software sites.

Good luck and have fun...

72/73 .-.-.
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AC5ZC
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Posts: 6




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« Reply #2 on: April 16, 2001, 11:38:17 AM »

Have a look at http://www.packetradio.com/psk31.htm
You will probably find a schematic or an interface kit you need.

73 de AC5ZC Hannu
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HAM2BE
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« Reply #3 on: April 16, 2001, 02:14:55 PM »

Guys,
     Thanks for the info.  I have found the answer to my problem.  In case anyone else is interested, If you have any brand of HT that uses  a 2.5mm MONO mic jack AND a 3.5mm MONO speaker jack, follow this link:

http://www.packetradio.com/sb16rads/202ht.gif

The schematic there shows an interface suitable for handheld radios.  I hope to have one constructed this evening, and try it out with my computer and packet software tonight.  I will post the results.

73,
Tim
KG4MQD
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