Someone asked me if we could use LoRa modulation on UHF. I said, I don't
know, let me look.
LoRa is a Chirp Spread Spectrum mode (CSS). Well, the FCC allows Spread
Spectrum on UHF I seemed to recall. Let me check.
97.3(c)(8): *SS. Spread Spectrum emissions using bandwidth-expansion
modulation emissions having designators with A, C, D, F, G, H, J or R as
the first symbol; X as the second symbol; X as the third symbol.*
Boy, this doesn't look good. I find that LoRa has an emission code of X1D.
X because no other emission mode works for spread spectrum.
Wait a minute. If no other mode works, why did they list all those. The
second and third emission symbols are mysterious, as it is obviously one
channel of data.
Good Lord. Looks like we can't do spread spectrum on UHF like they said we
could. How about AXX emission mode. AM spread spectrum, hee.
This isn't very digital voice related, but I always thought frequency
hopping on UHF would make a good voice modem.
I'm thinking about sending in a petition:
https://docs.google.com/document/d/15n1LYDJhhdqRon7j5lM3n2rFlOgoqrk-kCenKtx9YLo/edit?usp=sharing
Have fun,
Steve
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