[South Florida DX Association] June VHF Test Info

[Kai Siwiak]

Pete
Thanks very much for sending me your data. There is indeed a tendency 
for the #QSO in a range bin to show two peaks (not counting the nearby QSOs)

 

In this figure, the first bin (below 200 mi) contains  the local QSOs. 
There are two peaks, one at around 700 mi, the other near 950 mi, close 
to the behavior mentioned by Zimmerman in QST.  Strictly speaking we 
should divide the #QSOs in the bin by the bin range to equalize the QSO 
density per bin ring, but that will not change the fact that there are 
two peaks in the 600-1000 mi range!  Zimmerman and Kraft further 
speculate that the two peaks are too close in distance to to represent a 
different number of hops. So it remains an interesting propagation 
phenomenon that could use further explanation. I have analyzed all of my 
6m QSOs  from S FL, and have also noted the bi-modal separation around 
700-800 mi.

Thanks Pete for the valuable data. I will send you the Excel sheet 
separately.

73
Kai, KE4PT




Kai Siwiak wrote:
> Hi Pete,
> Your grid square map is extremely interesting, especially since you have a significant number of QSOs, and you were operating from a location in roughly mid-country. I was wondering if you could possibly expand on that data?
>
> Gene Zimmerman, W3ZZ, in QST July and August 2009, comments on the work of Joe Kraft, CT1HZE, suggesting that arrival angle probabilities for 6m band sporadic-E are bimodal, with one peak at ~5 degrees and another at ~10 degrees with very little below 3 or 4 degrees or above ~13 or 14 degrees. Those arrival angles correspond to distances of about 1500 km and 1000 km (940 and 620 miles) for a 100 km high ionospheric reflection/refraction height. 
>
> Is it possible for you to report your QSOs as a function of distance? Perhaps them "bin" the QSOs within, say, 100 mile wide range bins? I'd be VERY curious to see if Zimmerman's observation holds for your TN operation which is in "mid-country". Joe Krafts QSOs were from Europe. Do you see broad clusters of QSOs vs. range at around the 1000 and 1500 km (620 and 940 mi)?
>
> 73
> Kai, KE4PT 
>
>
>
> -----Original Message-----
>   
>> From: Peter Rimmel <n8pr at bellsouth.net>
>> Sent: Jun 18, 2010 10:14 AM
>> To: SFDXA <sfdxa at mailman.qth.net>
>> Subject: [South Florida DX Association] June VHF Test Info
>>
>> Sorry this took so long to get onto the net, but AT&T was screwing with their systems. 
>>
>> I have placed a Grid Square Map on my Ham radio web page that shows where I was able to work during the recent VHF test.  I worked 220 stations in the US, VE, XE, C6, CO and VP5 from here.  Note that the grid map almost creates a halo around Nashville at distances from 600-900 miles with a few longer, double skip contacts.  Other than the locals, I worked no one in close.  Interesting. 
>>
>> Just thought you might find this interesting, compard to the South Florida propagation.  The worst part of operating from here is that I had to keep the antenna rotating 360 degrees to work them all...  Down in broward county, we can just scan back and forth 90 degrees to "see" the whole of th US.  
>>
>> The map is at the bottom of the page. 
>>
>> http://personal.mia.bellsouth.net/n/8/n8pr/new_page_2.htm
>>
>> 73 y'all from nashville. 
>>
>> PeteR
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