The line on the graph is the signal strength of the beacon (-60dBm is S9+10db approx) time goes right to left so the recording starts at 1140 ends at 1211.
Weather at first was fog with rain arriving round-about 1145 and then getting more persistent.
I think that the drop in conditions is very apparent.
GB3VHF S METER LEVEL |
Towards the end of the recording signal strength is bumping along at S5-6 (-90dBm). It's also a lot less stable than earlier.
The regular dips in the trace at the beginning are the WSJT tones sent by the beacon which produce a slightly lower average S meter reading.
SIGNAL INCREASING |
This image shows the beacon increasing in signal strength.
Here is the link to the GB3VHF website and more info on this propagation report.
http://www.gb3vhf.co.uk/GB3VHFusingthebeacon.html
Hardware homebrew 144Mhz SDR - Software SDR-Radio by HB9DRV