RF module suggestions

Hello everyone,

I am building a weather balloon for a research project. It will be tethered and float at a maximum height of 100 M. I plan to have it transmit the temperature via radio to a hand held unit.

I was using a pair of walkie-talkies for transmitting the signal, but I think that I may have just fried one trying to modify it for my nefarious purposes.

Before I go and sink another $25 on a walkie-talkie set, does anybody have any suggestions for RF modules that I could get instead? Can you buy a paired transmitter and receiver? How expensive would such a system be?

Also, will transmitting the signal via an RF module change the frequency of the signal sent?

Thanks,
Jack

What kind of signal are you trying to send? Serial???

I plan to send the data using two different tones. Sorry for not making that clear.

Hmmm, are you using a micro-controller in the weather balloon?

Yes, I'm using a picaxe 18X chip both in the weather balloon and the hand-held module.

Would it be easier to send the data via a serial connection? I am a newbie when it comes to this stuff.

Yes, I think so, you can find XBee units to do the job Here: SparkFun Electronics - XBee 2mW Series 2.5 Wire Antenna

You will need one on each end, but they act like a wired connection between uC's