Re: VLF: TA east to west?

[Paul Nicholson <vlf0403@abelian.org>]

Stefan wrote:

> I can change to CRC 12 but 08:08 UTC means that about the
> last 90 minutes are running in daylight here.

I notice from recent T/A west to east, W4DEX + VO1NA continue
with good S/N well into daylight.  Also we don't see good
S/N before 23:00 or 00:00.  The path seems to start late
and finish late.   Perhaps the same is true of east to west?
We just don't know.  This frequency, this path, this distance,
all completely new and we have no carrier tests to guide us.

> f = 17470.1000 Hz
> Start time: 07.Dec.2017  21:30:00 UTC
> Symbol period: 60 s
> Characters: 1
> CRC bits: 10
> Coding 16K21A

The transmission has started then.  Reasonable settings and
I hope the early start doesn't lose too much.  We'll see.

Markus wrote:

> If you make the list long enough such that you always get
> an output (right or false), wouldn't the chance for a false
> positive not be 1 out of 52, or 1.9 %?

Yes, the list should be long enough to always get an output
(optimum list length setting).  And you're right, 1 out of
52 is the chance of false positive in that case.   My mistake,
I must have been thinking of rank 0.

--
Paul Nicholson
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