[Lowfer] DK7FC WSPR-15

[jrusgrove at comcast.net]

> Jay may be able to shed some light on this, but I had the unusual situation last night of 
> producing better SNR reports on DK7FC than Jay. That's not normal!

Have had this happen ocassionally in the past ... with other receiving stations as well. The most 
likely explanation involves antenna patterns and thunderstorms.

Last night, as a good example, I didn't notice anyone complaining about lightning static even though 
I was experiencing moderate, to at times, above moderate static levels. A look at the lightning map 
gave a good indication of the likely culprit ... check out the area in yellow circle at

http://www.w1vd.com/Tstorm.gif .

The antenna in use at W1TAG (box loop ... assuming it's the same old antenna!) with a figure 8 
pattern places a fairly wide null in the direction of the yellow circle when aimed at EU. On the 
other hand, the K9AY in use at W1VD has a cardiod pattern with the response down only several dB in 
the direction of the yellow circle due to large frontal lobe. A quick comparison of the two patterns 
at

http://www.w1vd.com/Figure8Cardioid.pdf  .

I verified this hypothesis (so I guess now it's a theory) a couple years back by installing a large 
single turn unterminated loop (figure 8 pattern) orientated toward EU for comparison to the K9AY. On 
nights when thunderstorms develop in that area I'm not surprised to take a back seat while using the 
K9AY.

Jay W1VD  WD2XNS  WE2XGR/2





----- Original Message ----- 
From: "John Andrews" <w1tag at charter.net>
To: <k3siw at sbcglobal.net>; "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Saturday, January 19, 2013 8:18 AM
Subject: Re: [Lowfer] DK7FC WSPR-15


> Jay may be able to shed some light on this, but I had the unusual situation last night of 
> producing better SNR reports on DK7FC than Jay. That's not normal! Consider:
>
> Time W1TAG vs W1VD
> UTC dB
> 0000 +1
> 0030 0
> 0100 No W1VD report (-36 from W1TAG)
> 0130 No report from either
> 0200 No W1VD report (-34 from W1TAG)
> 0230 +4
> 0300 +5
> 0330 +5
> 0400 No W1VD report (-31 from W1TAG)
> 0430 +3
> 0500 +3
> 0530 +4
> 0600 +3
> 0630 +2
> 0700 +2
>
> Jay and I are 70 miles apart, and while I'm closer to the signal source, this is a noisy 
> residential neighborhood compared to Jay's more rural situation.
>
> John, W1TAG
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