Troy H. Cheek writes in a message to All
 THC> Until recently, I enjoyed listening to the Tennessee Wildlife 
 THC> Resources Agency on 159.2400. Within the last few weeks, I 
 THC> realize that they're no longer transmitting on this frequency. 
 THC> Instead, I get some kind of data transmission. 
 THC> A friend says that the last thing he heard on 159.2400 was 
 THC> somebody reminding everybody to bring in their radios for 
reprogramming... 
 THC> 
 THC> So, have they switched to a new frequency and, if so, has anybody 
 THC> found it yet?
They are probably using digital Spectra/Astro radios from Motorola and have 
gone to digital voice on the same channel.  There are some advantages - you 
can't tell what is being said on a scanner and the signal is clear till it 
degrades to "nothing" - there is no noise.  You can also send computer data 
through the same radios.
  
However, the range is just a bit less than the (noisy) regular FM fringe 
reception.
 
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