17 Jul 2014

10m - tropo?

In the last few hours, I have spotted PB0AIC several times with low(ish) Doppler at 288km.  This is far too short for Es (unless the skip is extremely short, suggesting a 2m Es opening?) so I wonder if this is pure tropo? The distance exceeds most GDX  (usually possible with aircraft reflections) out to around 200km.  I have spotted PA stations before on 10m now.
Recent WSPR spots today

2 comments:

Anonymous said...

Hello Roger
I remember reading in the VHF DX handbook that the distance of a single hop sporadic E is greater the higher in frequency you go so the skip on 28Mhz should be shorter than on 144Mhz

Roger G3XBM said...

Yes, that is so. VERY short Es skip on,say, 28MHz is a good indicator of Es on much higher frequencies with a longer skip range. But the "skip" here is, I think, far too short for 28MHz Es. I may be wrong, but suspect tropo or aircraft.