Thanks Al and Bill,
There might be some scope for testing using remote stations when we get
further along with the software development.
Cheers,
David
On 3/5/21 1:52 am, Bill Buhler via Freetel-codec2 wrote:
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 - AF7SJ
Sent from my Galaxy
-------- Original message --------
From: Al Beard <bear...@unixservice.com.au>
Date: 5/2/21 1:01 AM (GMT-07:00)
To: freetel-codec2@lists.sourceforge.net
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-897D
connected to it? (and backyard dipole here in Sydney)
You will have to email or ring me to arrange frequencies and modes
ie. USB/LSB, 80m, 40m or 20m.
From the shell on the PI, you can ssh out or use "wget" to load
software. It is on an FTTC (Fibre To The Curb) internet connection
with a fixed IP address.
This is how Joe K1JT compiled on ARM the early versions of his
Soft Decision Decoder in WSJTX.
I setup an SSH login on the internet facing machine with another
SSH to the Pi.
Alan VK2ZIW +61414353013
On 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
> > Freetel-codec2@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/freetel-codec2
>
> _______________________________________________
> Freetel-codec2 mailing list
> Freetel-codec2@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/freetel-codec2
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Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.
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