|
> But BTW,
Edgar, are all the plots referred to 1 Hz NBW (not only the
noise)?
I think the signal lines are just the levels of the
spectral peak in the narrow FFT, there's no need for scaling these
with bandwidth. The noise BW of the FFT is small, which is why the
signal plot dives below the 1 Hz noise line when the signal
disappears.
Edgar, it may be worthwhile exporting and keeping
the SpecLab plots as text files (eg pltexpt_131009.txt). These can be
postprocessed to obtain colour graphs of signal strength versus time over many
days, similar to the ones posted by DF3LP for HGA a while ago.
Best 73,
Markus
Sent: Thursday, October 10, 2013 12:51 AM
Subject: Re: LF: Signal detection question
Hi Edgar,
Markus,
Am 10.10.2013 00:43, schrieb edgar:
> Hi
Markus,
>
> This is the DCF39 plot from the best DK7FC signal
capture last April,
> between 18:00 and 19:00 UTC.
>
> https://dl.dropboxusercontent.com/u/101251787/DCF39%20WR%20ver%20plot%202013-04-08%2021-30.jpg
>
Pff, DCF-39 is just 18 dB S/N at best! But BTW, Edgar, are all
the plots
referred to 1 Hz NBW (not only the noise)?
>
>
This is this mornings plot at Moonah.
>
> https://dl.dropboxusercontent.com/u/101251787/Copy%20of%20dcf39%20hga22%20plot%20m.png
>
Looks much better!! I've been TXing WSPR-15 though :-( Need several
antennas it seems...
Tnx for the data Edgar, and you good data
archive and documentation. And
all the efforts!
73,
Stefan
>
> Regards, Edgar
|
