I am working on a project that has a remote interface transmitting 
data to a central location.  Unidirectional at this time but you never 
know :). The data rates are low (2400 Baud is sufficient) and the 
distance is not excessive (50-100m).  I tried the TWS/RWS-434 pair 
connected to the UART of a PIC but that does not function very well.  
The problems appears to be that the receiver is always decoding data 
even when the transmitter is off line.  This, I assume is due to natural 
noise and is unavoidable.  Because of the noise, the RX UART has a very 
difficult time synchronizing to and receiving real data.

  I could add in the Holtek encoder/decoder pair but that adds 
complexity and component count.  If that is the best solution, so be it, 
but......
- Is it feasible to write my own asynchronous routine to receive the 
serial data bits and to shift through the stream until an SFD is 
detected? (and still have some CPU left over for other things)
- Has anyone used the Radio Packet Controller from Radiometrix.  Cost 
may be an issue here? http://www.radiometrix.co.uk/products/frpc2.htm
- Other suggestions?????

Phil

-- 
===========================================
PK Consulting
Phil Keller
Fremont, Ca

Phil@PKConsulting.net



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