Hope this graphic passes though the two groups /
reflectors...
It shows a vectorscope plot of the 252kHz RTE broadcast carrier this
afternoon.
The mean phase of the carrier is solid for hours, suggesting the
transmission is at least Rb controlled as the points do not rotate
around the vectorscope screen.
The interesting bit is the smaller circle with a radius of about 15 - 25%
of the mean signal amplitude, caused, I assume, by ionospheric
frequency shifting of a substantial skywave portion of the
signal. The plot represents 8.2 seconds worth of
carrier history, the small circle taking about 4 seconds to form,
suggesting there is 0.25Hz worth of skywave frequency shift associated with
it.
I'll try Droitwich as dusk arrives, but its annoying carrier modulation
means the resulting plot will not be so 'clean'
Andy G4JNT
