Hello Jay, LF,
A late thank you for the report and capture.
Short report what is new and happend here:
We had a loss of our web- and mail-server here for more than 1 day, so
i don't know if my previous answer to your email is lost or came
through...
I also lost the contact to my old notebook which i exclusively use to
generate tones for steering the PA. It is mounted in a fixed and closed
position, so i can't see the screen, only by using a teamviever remote
software access. But now i'm back and will put some more kWh of RF
energy into the iono :-)
Ah BTW, i did some changes on my LF receive antenna. Beeing impressed
by the excellent performance of the Twente WEB SDR and my need to have
another fixed antenna installation for 472 kHz i decided to try a new
active E field antenna circuit. The design is now a step closer to the
PA0RDT design (now using a wideband input, a source follower in the
first stage, i.e. no voltage gain).
But the main and very significant improvement was achieved by trying
another location. This is only 2m higher from the top of the building,
i.e. now in 37m AGL. It is fixed on a pole of a WX station. I
never expected such a difference. The complete building seems to be
covered by a QRM-cloud which greatly decreases with the
distance, even in that little height difference.
Now i can see the 630m band much more clear and several QRM lines
disappeared. The same applies to LF! Also the LF/MF background noise is
now not any more affected by the nearby resonant transmit antenna (not
at all!). This is only due to the location (i made a test with the new
antenna circuit on the old location). So now it is moch more easy to
become QRV on MF, which was the goal.
Still not sure but maybe my LF reception is much better now. I will
rise the antenna height by another 1...2m. Then i will give LF CW a new
chance :-) However there is still a local drifting noise source which
rises my LF noise floor...
Yesterday i worked DD7PC on 472.5 kHz who was a real 599 here, stronger
than all NDBs.
I discovered the world of receiving instead of transmitting ;-)
Due to the RX improvements i will receive in OP32 and WSPR
in the coming days, transmissions apprechiated!
My MF RX shall be running permanently, allowing to run a more permanent
available MF grabber to coordinate activity and check the band as seen
here.
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_MF_Grabber.html
I have to do some more tests and mods to the equipment but am
optimistic to have a good progress.
73, Stefan/DK7FC
Am 03.10.2012 13:32, schrieb [email protected]:
Stefan & T/A enthusiasts
Your signal popped out of the noise for just one sequence ... probably
a combination of 'constructive' propagation and a small improvement in
DST ... which I believe was ~ -25 to -30 nT at the time. Never say
never ...
Jay W1VD WD2XNS WE2XGR/2
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