[Lowfer] DK7FC WSPR-15

[jrusgrove at comcast.net]

Long path? Just kidding ...

Jay W1VD  WD2XNS  WE2XGR/2


----- Original Message ----- 
From: "Eric NO3M" <no3m at no3m.net>
To: <lowfer at mailman.qth.net>
Sent: Saturday, January 19, 2013 1:36 PM
Subject: Re: [Lowfer] DK7FC WSPR-15


> 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
>>
>>
> 
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