Yes, an impressive achievement indeed, congratulations to all involved!
Wow is the word! The 24dB S/N ratio on Dex' signal exceeded all my
expectations! 24 dB S/N is "armchair copy". It would be interesting to
actually listen to a spectrally shifted and time compressed version of
the signal. Can you do that on your Linux box Paul? Not for scientific
purposes but for pure sheer joy :-)
Given 24dB S/N headroom at 29.5kHz, sub 9 kHz TA is probably not too far
away! The TX antenna would be no more than ~10dB down compared to 30k.
73
Johan SM6LKM
Markus Vester wrote:
> Paul, Dex, Bob,
>
> wow, I am very much impressed by this work!
>
> So it seems there's three to share the honour of the first amateur VLF
> atlantic crossing. Funny that history seems to repeat itself - remember
> the unusual outcome of the strive towards the Peter Bobek award?
>
> Now I'm curious who'll achieve the first detection below 9 kHz!
>
> Best 73,
> Markus (DF6NM)
>
>
>
> *From:* Paul Nicholson <mailto:[email protected]>
> *Sent:* Wednesday, March 05, 2014 4:16 PM
> *To:* [email protected] <mailto:[email protected]>
> *Subject:* Re: LF: Re: VLF 29501, signal?
>
> An exchange of PMs confirms that Dex was transmitting
> at that time on 29501 Hz.
>
> Comparison of average signal level in 55uHz bandwidth
> from 02:00 to 07:00 UT
>
> http://abelian.org/vlf/tmp/140305a.png
>
> Bob: 24dB S/N
>
> Dex: 14dB S/N
>
> WH2XBA/4 line not so sharp, just noise or is that a bit
> of a wobble of the carrier phase?
>
> --
> Paul Nicholson
> --
>
|
