Stefan wrote:
> What an exciting achievement.
Yes indeed and it is also the longest distance message decode
at VLF.
Mike has put a lot of work into his receiver and I'm very
pleased to see this well-deserved success for him. He's
thought about putting up a loop receiver but the usual
obstacle is three channel A/D. We're both interested in
having another look at the Octo card to see if it can
be made to work well enough.
> For tonite i would start the new 3 charcter message on
> the TA path.
Yes that looks about the right settings. Three good nights
might do it if we're lucky. But realistically it'll probably
take more. Slightly worryingly, the phase of the two
1-char messages was 173 deg and 88 deg. Hopefully that
first reading is upset by noise, repeats wont stack
very well if that phase is genuine.
> i am in contact with UA0SNV. Yesterday he told me he was
> outside and installed a 120m long wire while it was -30 C
> outside :-) Heroic!
Gosh, -6 C outside here and I decided a nice warm office was
a better place to spend the day.
Well I hope you can raise some interest further afield Stefan,
you seem to have run out of receivers!
PS, I see some daytime signal from VO1NA today, for the
first time in a few days.
http://abelian.org/vlf/fbins3.html#p=1512928800&b=280&s=fd&m=fb&c=1
Quite faint in this bandwidth but it should come up after
midnight.
PPS, message just in from Mike:
Congratulations Stefan! Well done!
Paul: I'm going to swap my battery around 20:00 UTC - it's just
about flat, and I don't want to go dark at a random time over the
day or so.
Mike
Mike runs his receiver on a couple of big 12V batteries. That,
combined with a location well away from the house and a fibre
optic link, makes for excellent isolation. Ideal for registering
signals down at the one electron level!
PPPS, Stefan - what's your estimate of ERP at 17470 Hz? I'm
going to have a play with LWPC, to see what field strengths
might be like over various long paths.
--
Paul Nicholson
--
|
