Re: VLF: Back on 5.17 kHz / 58 km...

[Paul Nicholson <vlf0403@abelian.org>]

Stefan wrote:

> f = 5170.000000 Hz
> Start time: 02.Jan.2017   17:00:00 UTC
> Symbol length: 40 s
> Characters: 5
> CRC 16
> Coding 16K25A

Received 'HELLO', BER 41.1%, constant reference phase.

Carrier Eb/N0 = +1.0 dB, S/N: 15.57 dB in 22.3 uHz,

A little weaker than expected.

S/N -64.9dB in 2.5kHz after sferic blanking.  Before the blanker,
the signal measures -74.8dB after hum removal.


Markus wrote:

> SpecLab resets the phase of it's GPS-locked signal
> generators at midnight.

Ah, that would explain it, thanks.  Now you mention it, I think
we've hit that problem before but I had forgotten.

I measure a phase advance of 131 degrees at midnight.

We had better stick to frequencies that are a whole number of
cycles per day.   That also simplifies coherent stacking of
daily transmissions.

Jim wrote:

> Was the LWPC TX antenna angle parameter fairly close to
> actual angle?

I'm not sure what you mean there.

--
Paul Nicholson
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