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Date: Sun, 11 Oct 2015 07:58:48 +1100
Message-ID: <CAKvcm2f+pDZ7-XAivkOj2_FPpgwn_QgFJ7Pmog2GDivuEThPvA@mail.gmail.com>
From: Dimitrios Tsifakis <dtsifakis@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: QRSS/DFCW transmission with a Raspberry Pi
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Status: O

Hi Stefan,

all your good suggestions noted!

> BEV! That's it. Can you build a beverage antenna on your new QTH? Maybe 3
> Lambda on 630m? :-) You know, i would do so! :-)

Hmm, that's about 2 km of wire, my place is not big enough, but the
people around me seem to be quite friendly, so I guess it's possible.
What sort of wire would you use for this?

> Also it is very impressing what M0LMH receives in daytime here. The location
> and antenna construction is very important on MF i think. I belive there are
> effects that are important and that or that's importance we don't know yet!

 Fully agree!

> Well, the C-file for WSPR is already existing. So the Pi can be told to
> transmit on a certain frequency for a certain duration and then on another
> frequency for another durartion and so on. So QRSS /DFCW could be "just"
> some adaption/modification to the existing code.

I have butchered the pi wspr code and I can now arbitrarily produce
any frequency I like using the GPIO4 pin. That's the hard bit. Now I
need to produce the character to morse code translation code and add
the features you requested. Stay tuned!

> There could/should be a number of options like
>
> - [ -B ] beacon mode
> - [ -E 0500 ] stop time is 05:00 UTC
> - [ -S 0.2 ] 0.2 Hz DFCW-shift  (if this parameter is not used in the
> command line, i would choose a certain ratio of DFCW shift and dot length.
> Then the DFCW shift is set automatically)
> - [ -R 2.5]  Dash/Dot ratio is 2.5 for QRSS (3 without setting this
> parameter)

All good suggestions noted!

73, Dimitris VK2COW