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Transmitting wav file to a radio

Posted on 1998-10-23
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Last Modified: 2010-04-30
Hi,  Does anyone know if I can just transmit a .wav file through the RS 232 port into a radio and out to another radio by just sending the file using the MSComm control? Or am I just going to get a bunch of 1 and 0's on the other side?  How would I go about sending the .wav file so its played on the other radio receiving the transmission?  
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Question by:Nelmarcas
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mark2150 earned 170 total points
ID: 1441321
You're going to get 1's & 0's out the serial port.

If you plug the microphone input of a radio (say, CB) into the speaker jack of your computer (sound card output) then what would normally come out the speaker would be sent over the airwaves. You'ld have to figure out how to "key the mike". Perhaps a relay hooked to one of the lines on the serial port...

M

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by:Nelmarcas
ID: 1441322
Thanks, that's what I thought and just wanted to confirm it. Well, hope I the manual has the the function call I can send to it to key the mike or I'll have to call the manufacturer.  Thanks, I really appreciate it.


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LVL 12

Expert Comment

by:mark2150
ID: 1441323
Umm, you can fairly easily wire up a relay to the DTR line of the serial port. There's 20ma of +-12VDC available on that line. Tie the relay to ground with a diode in series and a kickback diode across the coil. This will give you good isolation between the PC and the radio. Also, I'd use a cap in series with the signal line for isolation. Keep you from getting lit up if someone reverses a plug.

M
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Author Comment

by:Nelmarcas
ID: 1441324
Great Idea!  I think I'll try this!  Thanks again.

Nelmarcas
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