Hi David,I've been following your development with interest. Would having a
station setup in Utah help? I'm happy to connect my pi to my HF station for
testing.Is the per carrier symbol rate low enough to comply with the FCC's
antiquidated requirements?Thanks, Bill Buhlet - AF7SJSent from my Galaxy
-------- Original message --------From: Al Beard <[email protected]>
Date: 5/2/21 1:01 AM (GMT-07:00) To: [email protected]
Subject: Re: [Freetel-codec2] HF radio needed in Germany for HF data project
(David Rowe) Hi David and Simon,Could you use a SSH connection to my Pi here
with the FT-897Dconnected to it? (and backyard dipole here in Sydney)You will
have to email or ring me to arrange frequencies and modesie. USB/LSB, 80m, 40m
or 20m.From the shell on the PI, you can ssh out or use "wget" to loadsoftware.
It is on an FTTC (Fibre To The Curb) internet connectionwith a fixed IP
address.This is how Joe K1JT compiled on ARM the early versions of hisSoft
Decision Decoder in WSJTX. I setup an SSH login on the internet facing
machine with anotherSSH to the Pi.Alan VK2ZIW +61414353013On Sun, 2 May 2021
13:02:31 +0930, David Rowe wrote> Hi Ross,> > We've already moved through steps
1 (development against software > channel simulator) and step 2 (one-way real
world HF Tx to SDRs),> our progress to date is summarised here:> >
http://www.rowetel.com/?p=7688> > As you can see the physical layer aspect of
the project is coming > along nicely. We have indeed been developing against
CCIR poor > (Multi-Path Poor or MPP in Ionos/Winlink nomenclature), and are >
getting encouraging results (see PNG in previous post).> > Simon lives in a
flat so even local Tx is difficult for him, and at > this stage of the project
(protocol development) he really needs to > test the back to back interactions
between two radios.> > The HF/Mimo work sounds interesting, would love to see
the papers!> > Thanks,> David> > On 2/5/21 12:27 pm, Ross Whenmouth wrote:> >
Hi David & Simon,> >> > To start with, rather than using two back-back radios
(presumably with > > a large attenuation factor in the RF connection between
the two), you > > could use an HF channel simulator such as;> > GNU Radio
https://wiki.gnuradio.org/index.php/Channel_Model > >
<https://wiki.gnuradio.org/index.php/Channel_Model>> > Ionos (Winlink)
https://winlink.org/content/ionos_simulator > >
<https://winlink.org/content/ionos_simulator>> > PathSim
http://www.moetronix.com/ae4jy/pathsim.htm > >
<http://www.moetronix.com/ae4jy/pathsim.htm>> > (CCIR has published
standardised HF channel models (eg CCIR poor) with > > which to configure your
channel simulator)> >> >> > Once you are ready to try out your modem "over the
air", to start > > with, you probably only need to set up a transmitter at your
QTH as > > you are blessed with access to a large number of public web SDRs > >
around continental Europe: http://rx.linkfanel.net/ > >
<http://rx.linkfanel.net/>> >> > Notably, there are nearby receivers in
Karlsruhe and Stuttgart, and if > > you are looking for a longer path (~450
km), the receiver at the > > University of Twente, Enschede, Netherlands is a
good option.> > Karlsruhe http://sdr.pjs.de:8073/ <http://sdr.pjs.de:8073/>> >
Stuttgart http://dj9kaikiwi.ddns.net:8073/ > >
<http://dj9kaikiwi.ddns.net:8073/>> > " http://bat-server.dyndns.org:8073/ >
> <http://bat-server.dyndns.org:8073/>> > " http://dl2sba.ddns.net:8073/
<http://dl2sba.ddns.net:8073/>> > University Twente
http://websdr.ewi.utwente.nl:8901/ > > <http://websdr.ewi.utwente.nl:8901/>> >>
>> > PS: Some very interesting research into 2x2 MIMO for HF digital > >
channels has been performed recently - I can send you the papers if > > you are
interested.> >> >> > 73 ZL2WRW> > Ross Whenmouth> >> >> >
_______________________________________________> > Freetel-codec2 mailing list>
> [email protected]> >
https://lists.sourceforge.net/lists/listinfo/freetel-codec2> >
_______________________________________________> Freetel-codec2 mailing list>
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https://lists.sourceforge.net/lists/listinfo/freetel-codec2---------------------------------------------------Alan
VK2ZIWBefore the Big Bang, God, Sela.OpenWebMail 2.53, nothing in the
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