Re: LF: More 8.97kHz WSPR decodes - changed PC here

[Roger Lapthorn <rogerlapthorn@gmail.com>]

Hi Eddie (et al)

It is highly unlikely you'd copy Andrew on VLF remembering that the WSPR signal spreads around 6Hz in the transmission burst, so the energy in any narrow FFT bin would be tiny. Also, this is earth mode (I hope, as G6ALB does not hold an NoV to radiate at VLF), so signals are propagating through the ground by conduction and no significant amount of signal is radiated. 

I'm still intrigued why the best reception here today was with my 80sq m vertical loop. This outperformed several earth electrode set-ups here at the RX end, an E-field probe and a 30t loop laying close to copper pipe work in the house!  If the signals are coming down the pipes then why don't these more direct means of coupling to them work as well as (or better than) a vertical loop outside? Odd.

73s
Roger G3XBM

On 27 April 2011 18:33, qrss <qrss@talktalk.net> wrote:

Great stuff Roger and Andrew

If you are RX'ing on an 80m dipole it may be worth a look here, I would never say can't until I have tried. Bearing in mind I should be able to observe signals which would not be decode able on WSPR

I would appreciate a prior notification of times and exact frequency of the WSPR signal of any further tests.

Keep it up.

73 Eddie G3ZJO

On 27/04/2011 15:19, Roger Lapthorn wrote:

As an experiment I changed over to my wife's laptop and got immediate decodes of G6ALB's VLF earth mode signal (3km) at -17dB S/N, suggesting the issue with lack of decodes may be with my soundcard and not Andrew's.

1408 -17 -0.6   0.008986  0 G6ALB JO02 47
1410 -17 -0.6   0.008986  0 G6ALB JO02 47
1412 -17 -1.2   0.008986  0 G6ALB JO02 47
1414 -17 -0.8   0.008986  0 G6ALB JO02 47
1416 -17 -0.8   0.008986  0 G6ALB JO02 47

This is a very solid signal on the 80m square single turn vertical wire loop antenna. Andrew is using 44W to an earth electrode antenna.

73s
Roger G3XBM

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