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Hi Chris, Dave and group,
I have temporarily shifted the 0.95 milliHz
spectrogram at http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm to your QRG, but no significant trace so far. With
a couple ef 100 milliamps up a balloon borne wire, there would have
been a very real chance for a detection. Hope you
can get that coil fixed!
But I would suggest to
go way slower - forget about QRSS-10, and start thinking
about many minutes or hours of coherent carrier transmission ;-)
My multi-hour transmissions in October
were sent from a similar sized backyard antenna, and were clearly detected both
by Stefan in Heidelberg at about 180 km and by Paul in Todmorden at
1027 km, using about 40 microHz resolution.
Wishing the best of luck,
73, Markus (DF6NM)
Sent: Monday, December 27, 2010 1:51 PM
Subject: RE: LF: VLF - G3XIZ - QRT
Graham,
see
Markus' post below:-
Sent: Saturday, October 09, 2010 8:09
PM
Subject: Re: LF: Re: Transmitting on
8969.998 Hz
Thanks a lot Stefan for this nice confirmation! I'm
quite amazed that it did work so well. And congratulations to you - as they say,
with QRP all the hard work is being done on the receiving side! And I
recall our conversation not long ago, when the two of us half-jokingly
calculated that we could probably work each other at one bit a day
;-)
The amazing thing is that virtually
everybody can do this. For transmitting, all you need is an average
LF backyard marconi, or a strapped 80 m dipole with reasonable insulation.
We actually live on a fairly small plot, and I have 42 m of wire up
at about 7m effective height. A power of 80 W gives around
0.28 A (ie. 21 kV antenna voltage). Thanks to Spectrum Lab,
accurate GPS or MSK stabilisation has become almost
straightforward.
I have stopped the transmitter now at 18:00, as I
do not dare to let it run through the night. If conditions allow, I will try to
add another dash tomorrow ;-)
Best regards,
Markus (DF6NM)
What was the Ae / power set up
used by Markus then ?
Sent: Monday, December 27, 2010 12:34 PM
Subject: RE: LF: VLF - G3XIZ - QRT
Chris,
Tough luck with the Loading Coil. I'm really
surprised that you didn't make 11 km...Markus managed 20km plus in his
tests in October.
Nil
desperandum!
73,
Dave G3WCB
At what time did you turn off?
(The other point labelled is wher ei inject a frequency 10Hz higher at
the start to check frequency cal)
If it is genuine, and not just a spuron, then QRSS 60 would probably
show results.
Its still running to see if that just-possible line has now clearly
gone.
Andy
On 27 December 2010 12:20, Chris Osborn <[email protected]> wrote:
Thanks for your efforts chaps.
I had definite QRSS-3
confirmation from Dennis M0JXM at 1.5 km but Pete M0FMT at 11 km
had no
copy.
I have developed an intermittent short-circuit problem with
the loading coil and will QRT now.
I'll notify via the reflector
when transmitting again.
73 Chris XIZ
From: James Moritz <[email protected]>
To: [email protected]
Sent: Mon, 27 December, 2010
11:44:17
Subject: LF: Re:
VLF - G3XIZ
Dear Chris, LF Group, The VLF RX has been
running since 1130 - Nothing seen yet. Cheers, Jim Moritz 73 de
M0BMU
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