I read in sci.electronics.design that Dbowey wrote (in ) about 'AM receiver chips?', on Sun, 19 Dec 2004:
A Google turned up that there is an avalanche research institute at Davos:
The site doesn't give any details of the radio beacon system. (But
*another* site says the frequency is 457 MegaHz!) The site is also largely in German - it may help to know that 'Lawin' is 'avalanche'.However, you could contact the Institute in English, and if they don't set the requirement for the radio system, I'm sure they know who does.
You probably already found the site