Check out the RF transmitters and antennas from Linx (IIRC...).
Specialy the plannar antenas and the KH modules.
VERY small and VERY useful

Juan Cubillo

----- Original Message ----- 
From: "Jinx" <joecolquitt@clear.net.nz>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Tuesday, February 14, 2006 3:44 AM
Subject: Re: [EE] Speedometer for the model railroad - RF or IR?


> > In the local station should be the ?? receiver, a PIC for counting
> > and calculating the "real world speed" (conversion from actual
> > speed in scale 1:160 to speed in 1:1) and presentation on a LCD
> 
> How much room have you got in a 1:160 wagon ? I guessed about
> 50-60mm x 20mm ?? I'd heard 2mm = 1ft. There are UHF data
> modules that are small and cheap. For example the TX434A (14mm
> square) and RX434A about half-way down this page
> 
> http://www.oatleyelectronics.com/whatsnew.html
> 
> I'm using the 433MHz version for a data link, great with a decent
> antenna
> 
> 
> 
> -- 
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round 
>http://mail.yahoo.com 
>
>  
>



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