Re: LF: WSPR on LF

[Roger Lapthorn <rogerlapthorn@gmail.com>]

I hope to be back on 136kHz TX quite soon (some weeks) Stefan. Copying my signal will be a real challenge, but I will of course look for other WSPRers and OPERA goers.

73s
Roger G3XBM

On 16 October 2012 18:37, Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de> wrote:

LF,

Does someone join in on LF WSPR? There are many active RX stations! Eddie/G3ZJO, what about you? Your results have been good on MF. On LF the ERP will be 10 dB lower (ish) if the TX pwr is the same but i expect that you will have quite good chances in the groundwave range.

There is a very high LF/MF and digimode appliance operator density in the UK ;-) Also in Germany and the Netherlands and France. It looks like we (these countries) make the highest density of active LF/MF amateurs in the world, except Tokyo city of course :-)

73, Stefan/DK7FC


Am 16.10.2012 15:48, schrieb George Szymanski:

You never know Stefan I might get a weak trace from you overnight!

I'm too stupid to use Spec lab!
I will try the Twente receiver but my internet is so very slow it
might not work well enough.

73 de George, DU1GM


On Tue, 16 Oct 2012 15:20:29 +0200, you wrote:

   

Hi George,

There is no chance for you to display normal WSPR from me over that
distance in a spectrogram. Maybe you could display WSPR-32 but this is
still to optimistic i think. We really have to start in something like
QRSS-120 or DFCW-180 and then see what comes out.

I have no idea how to set Argo for optimal displaying DFCW-180 since i
don't use the new version of the program. Furthermore i am very
convinced by using Spectrum Lab for LF/MF detection. Yes, the program is
much more complex but it offers some essential features! The band
limiting and noise blanking will reduce the QRN very significantly! The
improvement can vary from a few to 10 dB, depending on the kind of
noise.  I will try to generate a new spectrogram soon, showing this effect.
I don't know if Argo allows noise cancelling. But if you loose say 6 dB
SNR, that makes a difference from invisible to O copy.

Did you try the Twente WEB SDR link i sent you? This is also useful to
check if the reference signal you're using is available at present. I'm
daily listening to AM BCD stns for many hours a day :-)

As said, if you like i can give you some advice how to run a DCF-plot.

73, Stefan/DK7FC


     

   

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