Ashcraft IoB 070217
I refer to Tom's page on this event :
http://www.heliotown.com/Jupiter_Feb_17_2007__IoB.html
and his stereo audio file :
http://www.heliotown.com/JiobFeb17061217_21MHzweb.mp3
This event had a UFRO Yagi probability of 0.1 at UT 1200-1300, Large Array 0.5 .
This observation was performed at 21.1 Mhz with a Yagi and at 21.3 Mhz with a Half Wave Dipole.
Instrumentation: Hy-Gain TH-3JRS Yagi, Tom's Dipole, unmodified Sangean ATS-803 reveivers, Panasonic stereo
VCR recorder.
I believe this is the Sangean ATS-803
This is the dynamic audio spectrum, Yagi above, HW Dipole below.
The overall waveform, linear plot :
logarithmic plot, dB scale :
Most likely, the Automatic Gain Control is causing the two receivers to operate at varying gains as time goes by. I estimate, VERY ROUGHLY, that the Yagi signal is about 5 dB over the Dipole.
In free space conditions, a Yagi should have about 6 dBd gain ( 6 dB over a dipole), a factor of 4 in power.
Here is a 10 ms S burst at 21.1, no correlation at 21.3
S bursts drift to lower frequencies. The Yagi
pulses should be delayed relative to the Dipole. At about 20 Mhz/s
drift rate, the delay would be about 10 ms, easy to measure if we could
find pairs of correlated pulses.
Here is another period, active at both frequencies, with no discernible correlation.
And some more :
I was unable to find correlated bursts in the whole record.
For the three intervals outlined in gray,
these are the spectra :
The spectra are similar, with a 10-20 dB drop for the Dipole.
Victor Herrero
http://herrero.10gbfreehost.com/
http://hubbleed.bravehost.com/
