Hi Steve,
I think that this is a great idea, we've been playing with LoRa for a few
years now with great results. And now with some SDR libraries showing up it
stands to be an interesting option for UHF Voice/messaging.
73's
Daniel
Daniel Mundall
On Mon, Feb 27, 2017 at 2:00 PM, Steve <coupaydevi...@gmail.com> 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/15n1LYDJhhdqRon7j5lM3n2rFlOgoq
> rk-kCenKtx9YLo/edit?usp=sharing
>
> Have fun,
>
> Steve
>
>
>
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