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Content preview: Am 23.10.2017 11:06, schrieb Paul Nicholson: > > > What about
my recent EbNaut night time transmissions? > > Getting about +10 dB Eb/N0
on new E-field and about +6 dB Eb/N0 > on H-field. Excellent. So E+H could
be 12 dB. Based on the S/N reports from your last email we could manage to
pass the 100 character message on 5170 Hz in 4...5 days, e.g. http://abelian.org/ebnaut/calc.php?sndb=16&snbws=&snmps=12600&code=8K21&sp=7&crc=8&nc=100&submit=Calculate
which is still quite comfortable :-) [...]
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Am 23.10.2017 11:06, schrieb Paul Nicholson:
>
> > What about my recent EbNaut night time transmissions?
>
> Getting about +10 dB Eb/N0 on new E-field and about +6 dB Eb/N0
> on H-field.
Excellent. So E+H could be 12 dB.
Based on the S/N reports from your last email we could manage to pass
the 100 character message on 5170 Hz in 4...5 days, e.g.
http://abelian.org/ebnaut/calc.php?sndb=16&snbws=&snmps=12600&code=8K21&sp=7&crc=8&nc=100&submit=Calculate
which is still quite comfortable :-)
> An unusual message, though. Thought it might be a false
> decode, but it's equally false on both nights?
There are not many useful 1 character messages, so my creativity comes
to an end quickly :-)
Equal messages are a good sign though :-)
>
> > There have been discussions about pure copper into soil,
> > at least for transmit systems.
>
> If it degrades over time to produce noise, I would not be
> able to tell! Perhaps the next new rx will be a differential
> probe...
There are a lot of people here who have experience with ground rod
materials on low frequencies. The question is if they are reading this
and want to comment...
DF3LP is running a differential probe and has problised a design some
years ago.
73, Stefan