[Lowfer] DK7FC WSPR-15

[Eric NO3M]

My reception of DK7FC vastly improved when I switched from my NE 
to SW beverage array.  Seems like pattern reversal.  I discovered 
that accidentally when switching antennas listening for replies 
to CQs on 600m (RX path split w/ rig monitoring 2200M).  Suddenly 
DK7FC waterfall trace was much stronger.

73 - Eric NO3M, WG2XJM

On 01/19/13 09:28, jrusgrove at comcast.net wrote:
>> 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
>
>