There is a brilliant app note from http://www.microchip.com listed as
"Simple Circuit" DD00097  useing an 8 pin PIC. Use the crystal oscillator as
an RF source. Generate off "CW" pulses by sleeping on the WDT with the
prescaler changed to generate variable width pulses. The tank can match the
crystal or be an odd multiple. The circuit is simple and small. Protocol, RF
Osc, etc.. all in one. Just need a CW receiver and decoder.

http://sm0vpo.8m.com/index.htm Homebuilt circuits and PCBs for RX, TX,
power, building blocks, etc...

more at:
http://204.210.50.240/techref/default.asp?url=io/rfs.htm

James Newton mailto:jamesnewton@geocities.com phone:1-619-652-0593
http://techref.homepage.com NOW OPEN (R/O) TO NON-MEMBERS!
Members can add private/public comments/pages ($0 TANSTAAFL web hosting)
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-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Harry Febianto
Sent: Friday, December 31, 1999 11:14 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: High Freq Transmitter


Hi all,

Do you know the information about high (maybe very high) frequency
transmitter and receiver and how to build it ?

I have an idea to build communication device which can communicate each
other in the different floor in same building. (For example: the
transmitter in 32nd Floor and the receiver in Basement floor). The
controller is using PIC and need small size (not too big) and as cheap
as possible.

Any information, will be help full. Thanks a lot.

Regards,
Harry Febianto