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Stefan,
xx = 32
... for you ;-) Driving your antenna at the institute to 30 kV, you will
easily produce a milliwatt ERP. Opds-32 will
require about 20 dB SNR in a "6000" window (0.7 mHz noise bandwidth).
You will surely reach OK2BVG and myself, and most
likely PA1SDB, G3ZJO and others. We could probably persuade Paul
Nicholson to send a raw spectrum in ASCII format, and evaluate it with
opds. Yes, let's try it soon!
The difficulty with slower speed is mainly that
it's harder to set up - if you have to restart the data gathering a couple of
times, a day may be quickly gone without results. With experience things
will stabilize, and we can venture to very long times like Op-256 (aka
4H). This is what I would probably try to use from my home antenna (10 µW
ERP). Four hours nonstop would certainly be a challenge with a
kite...
Integrating very much longer seems to make
less sense, as QRN usually increases sometime in the afternoon. But
then one can think of a message sent over weeks, one bit a day -
didn't DJ8WX try something like that a while ago?
Best 73,
Markus (DF6NM)
Sent: Monday, December 09, 2013 7:14
PM
Subject: LF: OPDSxx on
VLF?
Markus,
What about a OPDS test on 8.97 kHz?
You and Lubos and maybe some stations in PA could deode me in OPDSxx, where xx
may be 128 or 256?
128, i.e. 2 hours, that's not slow for a complete call on
the 33 km band, about like DFCW-600.
What do you think?
73,
Stefan
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