Subj : Re: BBSing opportunties
To   : Warpslide
From : Vk3jed
Date : Wed Dec 22 2021 07:29 pm

-=> On 12-21-21 11:20, Warpslide wrote to Avon <=-

 Wa> On 21 Dec 2021, Avon said the following...

 Av> Yes this is an area of interest and has been for some time. I have never
 Av> actually taken steps to try to get such a thing working though. For some
 Av> reason it always felt hard to do, probably much more so that it is. I'm
 Av> a licensed amateur operator, not that active and where I am it's mostly
 Av> VHF and UHF stuff...

I was on packet in the heyday of the mode (1991-1992 mainly).  There's severe
issues with things like the "Hidden transmitter problem", which can seriously
harm throughput.  However, I found the IP based protocols like FTP were the
most robust, though you'd have to start a FTP session before going to bed and
see what had arrived by the next morning. :)

 Av> The other thing with this mode is it's rather limited to who can get on
 Av> the air / use the frequencies and if done well is still probably limited
 Av> to within a city or across a country using repeater networks... still
 Av> that's better than nothing for sure :)

Channel capacity, especially hidden stations dramatically cuts throughput. 
Might get better results with a duplex repeater, operating as a bit regenerator
(demodulates the signal, cleans up the bitstream and retransmits).  Using
duplex would at least solve the hidden station problem.  Probably have to just
use bit regeneration (processing packets would add delays that could affect
CSMA/CA performance).

 Wa> As others have said, TCP/IP can still work, even if the internet is
 Wa> down.  If you had someone within a few KMs of you, you could still use
 Wa> long range wifi to exchange packets.  Linus Tech Tips has done a couple
 Wa> of videos about this subject:

IT would allow a diversity of network links - from wifi to packet, as
appropriate. :)

 Wa> If things got really bad connectivity wise, perhaps mailing USB sticks
 Wa> with mail between regions/countries and then propagate out via long
 Wa> range wifi could be a strategy?  Either that or maybe Nick & I could
 Wa> train some carrier pigeons.
 Wa>  ;)

Got you covered. :)
https://datatracker.ietf.org/doc/html/rfc2549



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