Re: Eclipse: A Call to Action
G0NBD TX >> RX GM4ZMK Opera OP8 477 KHz [dial] Single carrier + 1500 Hz ASK
Shadow passed between stations ..
This was one of those unexpected results from the eclipse 2015 , observed from the UK , using the Opera single pass multi detector , available for 136 and 477 KHz
using 477 KHz , the land path was ~ 250 miles, constant ground wave @ -30 dB s/n in 2.4 KHz average over 8 minutes tx cycle.
At the onset, signal level fell to beyond the system lower limit , the next detection , at -40 dB , interpolation , would indicate ~ -45 dN s/n
Indications of multiple peaks before and after the event,.can also be observed .
What was observed
Turns out to be QSB caused by SKY-Wave .......the second monitoring station , north France , failed to run, it would of been possible , that a peak , co-incident with the Dip at Liverpool should of been observed ,At my range the sky-wave , phase , subtracted from the ground wave
I would offer the system as near ideal for this type of experiment , being single pass and good sensitivity , all bands from LW to uW are suitable
From the aspect of Data ''Validity'' each recovered s/n is the average of the TX time line during a single pass , , data may be recovered from the application , running on a web linked pc , the psk-map and http://ea3hmj.net/ea3hmj/spot/index.php