The simplest I've seen is one that uses a SAW(surface acoustical wave)
resonator.
It is a simple AM transmitter, capable of low speed digital transmissions.
Faster
transmissions may be difficult due to the non-linear nature of the SAW
device.

However there have been great strides in SAW technology lately, especially
in the
filter design.  They are actually rivalling crystal performance!

I believe there are several application notes on the RF Monolithics website.
http://www.rfm.com

Then just direct drive it with the TX output of a PIC!

Craig

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Hevard Txrring
> Sent: December 7, 1998 12:28 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: RF modules - singlechip version
>
>
> At 09:51 04.12.98 -0700, you wrote:
> >At least for the receiver you can check out MICREL's MICRF001, it's a
> >receiver, and it just needs an antenna, a couple of caps and a ceramic
> >resonator (or crystal).
>
> -But are there any simple solutions for generating the radio signal to be
> received by this chip.
>
> Haavard
> ------------------------------------------------
> Hevard Txrring
> ht@neo.no    xplisit@neo.no    simplisit@neo.no
> Norsk Elektro Optikk A/S       Tel: +47 67974700
> PoBox 384                      Fax: +47 67974900
> 1471 Skerer                    http://www.neo.no
> Norway
>