Re: VLF: TA east to west?

[Paul Nicholson <vlf0403@abelian.org>]

Jim AA5BW wrote:

> I installed a receiver with GPSDO at a new lower-noise* permanent
> location in Arlington, VA two days ago but it did not occur to me
> that the new lower noise level might accommodate detection of
> Stefan's 17470.1000 Hz signal.

You may be lucky but it'll be hard to beat Mike's E-field receiver,
it is probably the best in North America and is in a good location.
It is very similar to my new E-field rx, AD823 based.

> -38.55 dB in 1Hz would seem to suggest 6 dB in 8 hours using EbNaut,

Correct, 6.05 dB in 34.7 uHz to be precise, and the 3 character
message is 7.57 dB in 32.6 uHz.   Neither is significant in themselves,
but combined, we're looking at about 10dB which is starting to get
interesting!

Cross-correlation of EbNaut BPSK with the known message is equivalent
in sensitivity to a carrier detection over the same duration.

Let me know the exact lat/long of your Arlington rx Jim.  If you can
record the next transmission from Stefan I can run the cross-correlation
here and we can compare S/N and phase.

Here's Mike's (KE4RJQ) web page describing his set up

 http://www.unixnut.net/efield-current.html

Location is 37.35348N,79.19450W and the recording runs on Linux.
I'm able to log into Mike's VLF computer to extract raw signal.

--
Paul Nicholson
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