Message-ID: <4EDE6485.2050902@iup.uni-heidelberg.de>
Date: Tue, 06 Dec 2011 19:52:53 +0100
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: Re: TA 137 kHz
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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 a=
nd
> 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 whe=
n it
> drops right out.
Hm, well, but within SpecLab you know you can configure a coloured=20
spectrogram where the colour is related to the signal strength. And you=20
can directly read the signal level or/and the S/N. Depending on how=20
sharp the contrast is adjusted, - which is also visible on the clour bar=20
in most spectrograms -, a changing signal level can be clearly seen,=20
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=20
levels or in the background noise. Such a plot is running on the TF3HZ=20
grabber as well, which gives further interesting informations about=20
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.
>   =20
As long as a the noiseblanker and/or clipper and/or AGC is activated=20
(which is mostly the case) i agree :-)

> Great work keep it up!
>   =20
Thank you. I hope to leave some traces in 5X today, which is the last=20
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 Sch=E4fer"<Stefan.Schaefer@iup.uni-heidelberg.de>
> To:<rsgb_lf_group@blacksheep.org>
> 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:
>   =20
>> Hi Stefan
>> Interesting not a lot has changed in the last couple of days though th=
e
>>     =20
> Dst
>   =20
>> 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 fad=
ing
>> conditions tonight.
>>
>> Alan
>> G3NYK
>>
>> ----- Original Message -----
>> From: "Stefan Sch=E4fer"<Stefan.Schaefer@iup.uni-heidelberg.de>
>> To:<rsgb_lf_group@blacksheep.org>
>> Sent: Monday, December 05, 2011 11:18 PM
>> Subject: LF: TA 137 kHz
>>
>>
>>
>>     =20
>>> 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
>>>
>>>
>>>       =20
>>     =20
>   =20