[FOSS-GPS] New LoRa Radios- low power, SUPER range

[Danny Miller]

Anybody seen the new LoRa stuff?  I know of SemTech and HopeRF so far.  
Cheap and they're already offering assembled, integrated modules.

They're low-power, but CRAZY long range.  Supposed to be literally miles 
in URBAN environments.  As best I can tell it's due to some super 
high-gain amps, sensitivity to -148dbm.  Models do differ though.

This sounds really handy for RTK communication with a beacon .  I'm 
getting a few of these to try out.

So there's 433MHz, 868 MHz, and 915MHz.  Any reason to choose one over 
another?  I know 2.4GHz is supposed to be a problem because it can't 
penetrate trees well like 900MHz does, but the 868 MHz and 915  MHz are 
basically 900 MHz.  433 MHz, I have no idea how that performs, 
relatively speaking.

Danny