Hi Stefan and all,
Thanks for the experiment, and compliments to you, Paul, Michael, and
all others sending in reports.
This time I tried reception with an indoor antenna, but was plagued by
QRM. However the GPS-locked reception (using a cheap Garmin GPS 18 LVC,
with 1-pps-output) seems to work reasonably good, so this may be a
better alternative than the VLF MSK transmitters - especially for
transmission.
Have a nice sunday everyone,
73, Wolf .
Am 27.11.2011 13:17, schrieb Stefan Schäfer:
Just want to say thanks to Wolf/DL4YHF for SpectrumLab and its perfect
function to compensate the soundcard drift by using a reference
frequency or a VLF MSK transmitter! Without that software, there would
be almost no successful work by amateurs on VLF at all (except
listening to natural stuff).
Using VLF MSK transmitters as the reference must work well too. There
are 47 uHz spectrograms running e.g. at G3ZJO and TF3HZ who clearly
show a streight trace on exactly 8970.005 Hz, see
http://g3zjo.bplaced.net/index.htm and
http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/
73, Stefan
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