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Date: Wed, 25 Jan 2017 21:09:52 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: ULF:  EbNaut over 3 wavelengths on ULF
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Status: RO

Hi Paul,

(i updated the subject title)

Am 25.01.2017 19:30, schrieb Paul Nicholson:
> > f = 2970.000000 Hz
> > Start time: 25.Jan.2017   07:00:00 UTC
> > Symbol period: 30 s
> > Characters: 5
> > CRC bits: 16
> > Coding 16K25A
>
> Decoded at Bielefeld via DL4YHF (303.8km).  Copied 'DK7FC' with
> Eb/N0 +4.5 dB and constant reference phase.
>
> S/N 19.1 dB in 29.8 uHz, -60.1 dB in 2.5kHz.

Just excellent! Thanks for working out the decode!
My call passed over 3 wavelengths on ULF, that's a dream! I am sure we 
will manage even more.

Very interesting to see the high Eb/N0 relative to yesterday. From the 
calculator it should have been weaker. And the QRN didn't look much 
lower than yesterday, at least from here.
Some there's a relatively high uncertainty down there, and the risk of 
getting no decode when coming to close to the limit. The stacking is an 
advantage again.

> I'm still working on the recordings from the weekend.  Gained a further
> 3dB by using very strong hum filtering, a threshold only 1.5 times the
> mean amplitude and narrow notches.  Enough to suppress not just the
> harmonics but also the sidebands of the harmonics.   Still no trace
> here in Todmorden - yet.  Still some permutations of polarisation
> and azimuth to try.
Am 23.01.2017 18:52, schrieb Paul Nicholson:
> Still no trace of the signal here.  But tweaking the blanker
> isn't going to go from 'no trace' to 'significant detection'. 
3 dB is very significant! Congrats to that. It will also help to get 
better results from Renatos data. But as far as i remember he is 
offering the stream with the blanker already applied.
We could ask him to disable it temporarily, if that helps. If he knows 
what we're trying, he will do it i expect :-)

> We are having fun with this!  Constantly pushing at the limits.
Oh yes, and also a lot to learn about the optimisation work for the 
different bands.


73, Stefan