Thanks for answers to both of you :-)

As Jim mentioned, I was saying about TV Remote :-)

RF frequency of such devices in Poland, is 417 MHz or 433 MHz in most cases.
It is always monodirectional so I plan to buy two sets of such extenders and 
connect it, is that manner:

<RCX> -(ir)-> <"IR Receiver - RF Sender" A> -(radio)-> <"RF Receiver - IR 
Sender" A> -(IR)-> <Tower>
   ^---(ir)-- <"RF Receiver - IR Sender" B> <-(radio)- <"IR Receiver - RF 
Sender" B> -(IR)-----|

I've found very small devices of that kind, with power input 5V 100mA. I think 
that I can safely plug it to 9V battery, because I think that it has to be 
converted inside to 12V to power the radio unit.

I've no idea if it will work, but I'll try... someday. 
I'll keep in mind to post results here.

Best regards
Szymon 


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PS. Fajny portal... >>> http://link.interia.pl/f196a


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