Steve wrote: "Looks like we can't do spread spectrum on UHF like they said we
could"
Are you perhaps confusing the separate terms "SS" and "Spread Spectrum" ? They
have different meanings in Part 97.
The SS definition you quoted defines the limited sub-set of Spread Spectrum
emissions which CANNOT be used below 222 MHz but can be used above that
frequency.
Those Spread Spectrum emissions which are NOT "SS" are permitted on all bands
subject to ยง 97.309
73 Trevor M5AKA
On Monday, 27 February 2017, 22:01, Steve <[email protected]> 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 modulationemissions having
designators with A, C, D, F, G, H, J or R as thefirst 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
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
