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Message-ID: <003a01cbd03a$c272b8d0$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4D5DDD5F.3050307@gmail.com> <4D5E6D92.2060608@freenet.de> <4D5F12D8.4010505@gmail.com> <4D5F90FC.2080403@freenet.de>
Date: Sat, 19 Feb 2011 13:41:44 -0000
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Subject: Re: LF: HGA22 plot
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Hi Both, musing....if one used a very narrow capture bandwidth could that be
cause by "ringing" after the telegrams ....they are usually around 10 secs
apart??
Alan G3NYK

----- Original Message ----- 
From: "wolf_dl4yhf" <dl4yhf@freenet.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, February 19, 2011 9:44 AM
Subject: Re: LF: HGA22 plot


> Hi Dex,
>
> you wrote:
> > I had moved the plot to 60 khz before I read your suggestion Wolf.
> > Here's what I am seeing tonight:
> >
> > http://www.w4dex.com/lf/HGA22_0030_19feb11.jpg
> >
> Interesting, the sine-shaped pattern is still there - and the
> 'oscillation' frequency is suspiciously constant.
> Would be interesting to see an FFT of the signal strength plot, to see
> how stable the frequency of the 'AM' is. To do that, one would have to
> export the data as a text file (which is possible), and import it into
> some post-processing software like matlab (which I don't have myself).
> Which function (especially the observed bandwidth for that signal) did
> you use to plot it, the peak function or the power (or effective
> voltage), in which frequency range ?
>
> I'd like to plot the same signal with the same BW here, just for
> comparison. I don't think I will have two different reflective layers on
> the signal path...
>
> 73,
>    Wolf .
>
>