[Lowfer] DK7FC WSPR-15

[John Andrews]

Jay,

My receive antenna now is a single-turn loop, 5' in diameter. It runs 
through a 1:10 step-up transformer, and then is parallel-tuned and run 
through a preamp. Performance is pretty close to a 10-turn loop of that 
diameter. Gotta write all this stuff up, someday...

Anyway, it was a rare victory for the Massachusetts team last night. 
Perhaps a prelude to a similar thing starting at 6:30 PM on Sunday?

JA

On 1/19/2013 9:28 AM, 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
>
>
>
>
>
> ----- 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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