[Fwd: LF: LORAN-C samplings and spectra...]

[André Kesteloot]

Peter W. Schnoor wrote:

> Hello all,
> Dear Paul (OH3LWR),
>
> To all who are interested in LORAN-C analysis:
>
> I made some samplings and advanced analysis this
> late afternoon and I´m uploading four files:
>
> 1.
> ftp://ftp.qsl.net/pub/df3lp/136/loran/5secofAM100.wav
>
> Audio file 44100 samples/sec, length 5 sec.
> Converter+Drake R4c, AGC ON, AM (!) 8 KHz,
> receiving frequency 100 KHz, ferrite rod.
>
> 2.
> ftp://ftp.qsl.net/pub/df3lp/136/loran/5secofAM135.wav
>
> Audio file 44100 samples/sec, length 5 sec.
> Converter+Drake R4c, AGC ON, AM (!) 8 KHz,
> receiving frequency 135 KHz; Marconi, top-feed.
>
> 3.
> ftp://ftp.qsl.net/pub/df3lp/136/loran/loran100am.gif
>
> Screenshot GIF file from MXV audio analysis
> program (UNIX). Shows some ms of amplitude
> on 100 KHz. Source: look at 1.
>
> 4.
> ftp://ftp.qsl.net/pub/df3lp/136/loran/loran100amspectrum.gif
>
> Screenshot GIF file from MXV audio analysis
> program (UNIX). Spectra of about 800 ms of
> LORAN at 100 KHz. 109 overlapping FFT-Windows,
> rectangle, 2048 samplings, shifted 441 samplings
> each (100 ms). (Experts will know what this means.
> Yes Paul, there are peaks each 1 KHz and the
> spectra varies over time. I will hope that this
> would be a sampling artifact...)
>
> I´m not an expert in LORAN but very interested in
> blanking the heavy LORAN sideband trash here. So
> I hope that my efforts could help. If anybody
> involved in LORAN analysis wants to get more
> samplings or analysis procedures, mail me!
>
> (If You could not find all files this evening,
> please be patient. It´s hard to hold connection
> to qsl.net at this time...)
>
> 54°16´N / 10°04´E, JO54ag
> Peter, DF3LP