Hi Alan,
Am 06.12.2011 12:35, schrieb Alan Melia:
[...] One must remember that the display of grabbers is very non-linear
there is only about a 3dB change in signal strength to go from T to O and
then little obvious change until it "dog-bones", so they are not ideal for
seeing the detail of fading on a signal which it at least O, except when it
drops right out.
Hm, well, but within SpecLab you know you can configure a coloured
spectrogram where the colour is related to the signal strength. And you
can directly read the signal level or/and the S/N. Depending on how
sharp the contrast is adjusted, - which is also visible on the clour bar
in most spectrograms -, a changing signal level can be clearly seen,
even if a signal remains at "O copy". This is what i saw yesterday.
Also you can configure a plotter that shows you a dip, either in signal
levels or in the background noise. Such a plot is running on the TF3HZ
grabber as well, which gives further interesting informations about
daily LF propagation.
You are also seeing not a real signal strength but more a
S/N display which depends very much on local noise conditions.
As long as a the noiseblanker and/or clipper and/or AGC is activated
(which is mostly the case) i agree :-)
Great work keep it up!
Thank you. I hope to leave some traces in 5X today, which is the last
night of the 5X grabber as Alex stated.
Also keep up the good work and discussions.
Best 73, Stefan/DK7FC
Best Wishes
Alan G3NYK
----- Original Message -----
From: "Stefan Schäfer"<[email protected]>
To:<[email protected]>
Sent: Tuesday, December 06, 2011 1:01 AM
Subject: Re: LF: Re: TA 137 kHz
Hi Alan,
Yes, ther is strong QSB at W1VD. I was watching his grabber in the last
hour but my signal was lost then. Anyway i saved the cpature i saw when
i first saw my signal. Now the capture is here too:
http://dl.dropbox.com/u/19882028/LF/grabupload1.jpg
QRSS-10 is relatively fast and it would be interesting to have a beacon
running in that speed. Will first have a look on the TX system since
there have been strong winds here.
I hope for better propagation soon.
TF3HZ seems not to care about propagation ;-) His grabber always shows
very good signals.
73, nw gn, Stefan/DK7FC
Am 06.12.2011 01:54, schrieb Alan Melia:
Hi Stefan
Interesting not a lot has changed in the last couple of days though the
Dst
did recover from -30nT on the 4th to about -15nT today but that should not
have dramatic effects. There was a small flare C5 just before midnight but
that would only affect paths in daylight. Maybe you got favourable fading
conditions tonight.
Alan
G3NYK
----- Original Message -----
From: "Stefan Schäfer"<[email protected]>
To:<[email protected]>
Sent: Monday, December 05, 2011 11:18 PM
Subject: LF: TA 137 kHz
Jay, LF,
Propagation seems to be back ;-)
http://www.w1vd.com/grabber.html
Many thanks for looking Jay. Never expected to see my signal in QRSS-10
on your grabber :-)
73, Stefan/DK7FC
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