Hello Samuel,
I just wondering best way to get really sensitive comms, so a 5W HT
could go for miles and miles.
The Wenet project shows what can be done with careful engineering of the
modem, e.g. sending HD images at 100 kbit/s @ 50mW over 100km:
http://www.rowetel.com/?p=5344
The key is the demodulator. For your application I'd use the FM HT to
Tx, and a $20 SDR with a LNA as the Rx.
Also worth mentioning a new Android link budget calculator:
https://play.google.com/store/apps/details?id=org.lowsnr.test4&hl=en
Written by a good friend of mine, Bill, VK5DSP. Try plugging numbers
into this to get the range you want and understand the trade offs.
Cheers,
David
Sam
M1FJB
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