Carrier of DJ8WX measured in about 80uHz bandwidth. S/N is 18.4dB in
this bandwidth.

 http://abelian.org/vlf/tmp/151208a.gif

The magnetic flux density of 0.1fT corresponds to around
30nV/m electric field strength.

Uwe wrote (28th Nov)

> Coding 8k19a
> Characters 2
> Bits 368
> Duration 01:01:20.00
> Start 2015-11-28 17:00:00
> Rpt on hour
> (in between carrier only)

With the above S/N, this should decode at about Eb/N0 = +2.5dB

Uwe wrote (today)

> carrier on the air.
> the message starts at 18:00:00

At 18:00 I am still getting carrier.  When I run this into
the decoder it struggles to decode, the noise has come up
since the S/N measurement.  I add in the E-field to gain a
couple of dB and then the carrier decodes:

 18:00:00 to 19:01:20
 found rank 0: **  ps [  2   30   30   30   30]
 re-encode 131/368 ber 3.56e-01  Es/N0=-11.6 Eb/N0=3.3

(Carrier decodes to a string of * characters).

--
Paul Nicholson
--