3 Dec
2021
3 Dec
'21
7:39 p.m.
Pactor 4 is NOT in that situation. On HF, you are limited to 300 baud. Pactor 4 is way
faster than 300 baud.
Kun
________________________________
From: 44Net <44net-bounces+dnwk=linkun.info(a)mailman.ampr.org> on behalf of Cliff
Sojourner via 44Net <44net(a)mailman.ampr.org>
Sent: Friday, December 3, 2021 11:44
To: 44Net general discussion <44net(a)mailman.ampr.org>
Cc: Cliff Sojourner <cls(a)employees.org>
Subject: Re: [44net] DN42 for 44net?
DStar is not a good example for your point. AMBE codec was patent encumbered for many
years, not completely documented, so technically unable to be easily decoded.
I'm aware of one open source implementation of it, don't know if it is used at
all, or how well it works.
Remember, PSK31 was not allowed by the FCC, until an open source implementation became
commonly available. They key was documenting Vari-code. It's not difficult, or
tricky, it is just a Huffman encoding such as used by Morse Code! So the PSK31 experience
is the model for getting acceptance of a not-human-readable mode on amateur frequencies.
Pactor 4 is in that situation now. Proprietary codec, patent encumbered, not publicly
documented... So should not be allowed on amateur frequencies; Commercial frequencies,
ok.
I'm not sure about VARA, anyone know?
On December 3, 2021 9:58:23 AM PST, KUN LIN via 44Net <44net(a)mailman.ampr.org>
wrote:
Encoding is not encryption. You could decode D-STAR if
you have the chip and everyone is free to decode the conversation.
Kun
________________________________
From: 44Net <44net-bounces+dnwk=linkun.info(a)mailman.ampr.org> on behalf of Dave
Gingrich via 44Net <44net(a)mailman.ampr.org>
Sent: Friday, December 3, 2021 9:45
To: 44Net general discussion <44net(a)mailman.ampr.org>
Cc: Dave Gingrich <dave(a)dcg.us>
Subject: Re: [44net] DN42 for 44net?
Please point out where the "the USA encryption restriction” over radio links, is
documented. After all, D-Star radios use a proprietary codec. Heck even if you access
https://ampr.org/ over a radio link, the connection is SSL encrypted, as are nearly all
web sites in the world.
Encryption over RF links has not been illegal for years, at least in .US. I can’t speak
for other jurisdictions.
—
Dave K9DC
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On Dec 3, 2021, at 11:23, air gapped via 44Net
<44net(a)mailman.ampr.org> wrote:
Something to keep in mind: the USA encryption restriction only applies to traffic going
over the air.
Networks can and do have encryption as long as relay over air has information in the
clear.
Adam Lewis
KC7GDY
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