LF: Doppler effect.

["Dave Pick" <g3yxm@wireless.org.uk>]

Dear all.

 

I have the Argo screen-shots of ZL6QH recorded in Papua New Guinea, a path of about 4,700km. This is not very different from out trans-Atlantic tests but Ricks traces show a Doppler effect around midnight which spreads the signal over about 0.1Hz, I have never seen this on a 136k trans-Atlantic trace.

Have a look at the shots on http://www.wireless.org.uk/newspic63.htm and see what you think.

 

Rick has calculated that the reflecting medium would have to have a velocity of around 100m/sec, assuming a double hop, to cause this kind of shift.

 

Any propagation brains care to speculate on the cause of this, and is there a reason why we haven't seen it on 136? 

 

73.

Dave.

G3YXM