I think you might be mis-reading the relevant rules here. I suggest you give
the ARRL Lab a call and sort it out.
73,
Dana K6JQ
P.S. I'd be shocked if you could come up with a compatible implementation that
doesn't trample on Semtech's patents, which doesn't prevent experimentation, but
draws a sharp line at any kind of commercial utilization.
P.P.S. I am not an attorney despite having been accused of that several times.
On 2/27/2017 2:00 PM, Steve wrote:
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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