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Dear George,
here is a resend of an earlier post. It contains the
0.95 mHz FFT settings currently used for my grabber,
with samplerate tracking to GBZ 19.58 kHz.
Good luck,
Markus (DF6NM)
Original Message -----
Sent: Saturday, May 15, 2010 9:11 PM
Subject: LF: URGETNT!!!! PLZ REPLY Re:
DK7FCs 5th VLF experiment...
hi stefan
iam thinking to setup the loop and receiver
tomorrow moring on the roof and leave it unattended to grab.... and
leave
i will return back home about 5 pm
I TESTED SOME CONFIGURATION FILES FOR SPECTRUMLAB
...BUT I DONT THINK I HAVE THE CORRECT FFT SETTINGS
CAN YOU PLEASE SEND ME A SETTINGS FILE
SUITABLE FOR YOUR TRANSMISSION?????
PLEASE ANSWER!!!
73
SV8GXC
----- Original Message -----
Sent: Thursday, April 22, 2010 7:34 PM
Subject: Re: LF: vlf stuff
Dear Laurence, VLF Dreamers,
those settings will require some adaptions, regarding
samplerate etc. (see posting below). Attached is the
current setup of my VLF grabber with 0.95 mHz resolution.
SpecLab 2.75 b08 contains a new samplerate
tracking algorithm based on the strong and precise VLF
MSK transmitters. It is very easy to set up, and avoids the
difficulty to identify the central line in the Alpha spectrum. I am
currently tracking GBZ 19.58 kHz here. To use the stateside transmitters
(NAA, NML) at 24 kHz and above, you will have to switch from 48 to 96 kHz
samplerate.
BTW - What is your distance to Paul W1VLF?
Kind regards,
MArkus (DF6NM)
----- Original Message -----
Sent: Thursday, April 22, 2010 6:56
PM
Subject: RE: LF: vlf stuff
----- Original Message -----
Sent: Saturday, April 03, 2010 10:03
AM
Subject: VLF: SpecLab settings
Dear Wolfgang, Daniele, LF,
thanks Wolfgang for the hint about turning off
periodic actions.
There are actually three configuration
files in
so some explanation is probably on
order:
- 9kHzWide.usr has 0 to 24 kHz on the
top and around 9 kHz at the bottom, with 1.46 Hz FFT resolution and 1
second scrolling. It's meant to give a quick overview of the band, eg.
to optimize antenna coupling. You shold see the big MSK signals,
and three lines of tiny dots on the Alpha frequencies. But this
setting is too fast to see a weak signal.
- 9kHz_slow2_white is the original 15.3 mHz
setting, with the 8.97 kHz area at the top and 11.905 at the bottom. It
scrolls at 10 seconds, and you can read QRSS 60 or slower keying. Beware there
is an offset (0.30 Hz and 0.0397 Hz) on the frequency scales, which
I had used to correct for my "white" notebook's samplerate offset. But
this will certainly be different on other machines, so I would
recommend to reset those offsets to zero, and use the samplerate
calibration entry in SpecLab's audio settings tab instead.
- 9kHz_4mHz.usr is the
one currently displayed on the lower part of my grabber. It has a more
sensitive 3.8 mHz FFT and 1 minute scrolling. Again, you should delete the
Freq1 and Freq2 offsets and enter your samplerate.
Good luck to Stefan and all,
Markus
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