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Jamez_Warner

cheapest way to achieve serial data link

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what am I looking at? £

I have got a few cheapy data modules,

http://www.rentron.com/rf_remote_control.htm

but having a few interfacing problems, I can talk to PIC controller via MAX232 on cable link fine - tuned the radio modules ( so im sending/receiving at TTL ) PIC don't receive anything - gonna have to get a scope on it...

probably not much range - but its a start I suppose !

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I dont remember what I paid and it was for custom frequecys too but it was a couple of hundred I think ???

I have used the modules like you have before but never done better that about 50 metres :(

Terry

UK

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might I have more luck with handhled radios? about £40 for a good mile range, is there enough bandwidth to trasmit data at a reasonable rate? and how would i interface serial>audio audio>serial

James

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Yes. I used some converted ones a few years back and they worked well. The main problem was the weight and size. Have a look on this forum for threads on packet modems to be used with the audio channel. That should get you started.

Terry

UK

Edited by Terry

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You are aparently not from the US, so this might not apply to you, but I'll post it anyway. Here in the US, FRS radios can be had for under $20 per pair. Data communications on the FRS frequencies are illegal however the radios, with a little work, can be modified to work on the ham band. This has been discussed pretty extensively on the radioexperimenter yahoo group. I've personally done it on 4 different radios, and it's an interesting project.

Coupled with a simple modem, this is a very cheap solution.

Nathan

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great :), any suggestions for modem's? - I don't mind building if its simple...

James

The MX614 is sort of a standard among the ham community. You can find it at www.glitchbuster.com. Only 1200 bps, though--fine for me, but I think you were looking for something faster.

Nathan

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