A lot of people on this list shy away from radio (and many from analog
in general) electronics due to the high level of effort and knowledge,
and the relatively cheap modules that take care of this for us.  It's
not that it's a black magic that no one knows, it's just easier, faster,
and in many cases cheaper not to deal with it.

I'd suggest you either
1) get a pre-made transceiver from some source
2) hack some FRS, or walkie talkie, or cordless phone to do what you
want.  A cordless phone, for instance, provides full duplex
communication for (often) less than $20.  the only thing you need to do
then is look into the interface, since you can't reliably send digital
over them.  Some sort of FSK modulation is needed, which can be sent
from the PIC.  You'd then just need a detector on the receiving end to
receive the modulation and translate back to digital.

If, however, you really want to get into it yourself, then get the ARRL
handbook, and look around the net for HAM web sites.  You'll likely find
other lists that are more tuned into radio discussions than this list.

-Adam

Lars v.d. Doelen wrote:

>Dear electronicers,
>
>The recent "low power rf application" thread got me exited about building my own rf link between my computer and my PIC controlled robot. Unfortunatly the thread got useless after about 2 reactions, so I still didn't get the answers I was hoping for.
>
>I'm trying to build a bi-directional, wireless link with my pic (16F84) robot. I found several commercial TX/RX modules that only go 1-way, but I would like (if possible) to build my own TX/RX modules that will give me 2-way communication capabilities. My main reason for this is a limited budget.
>
>The above project leaves me the following questions:
>* Can anybody help me to a 2-way TX/RX schematic that will allow me to send/receive bytes to/from my PIC?
>* What kind of trouble am I getting myself into by trying to build the rf modules myself? Is saving a few bucks worth the hassel?
>
>Thanks for any response you'r willing to give me.
>
>Lars
>
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