Re: [Lowfer] LF: XRS4 and 5 last night

[Pat Bunn <pbunn@matrixei.com>]

Strong signal from both here in EM94bw. Dex is wiping out the screen and 
audibly loud enough for a 599 QSO. The loudest that I have ever heard him. I am 
taking turns off my barrel coil to get my antenna matched
As soon as I can. I hope to be on 74 KHz by the weekend. Dex - hopefully we can 
do a QSO

Pat
WG2XLP


Sent from my iPhone

On Jan 7, 2014, at 1:55 PM, Dexter McIntyre W4DEX <dexter.mc@gmail.com> wrote:

> Bob Raide wrote:
>> Mike;
>> First, thanks for great captures of Dex and me.  A look at Hartmut's grabber 
>> showed my signal weak or just identifiable with only a couple solid times.  
>> Same with Markus's grabber.  Dex is south of me by at least 300 KM and it is 
>> amazing to see his signal over 7000 KM as solid as a rock!  I don't think it 
>> would have been that good on 137-but we will never know only over an average 
>> of more runs.
>> "One for the propagation experts" is an understatement, indeed.
> 
> The antenna here was perfectly tuned at mid day when the high temperature was 
> about 42F.  The cold front arrived with high winds and the temperature fell 
> quickly reaching a low of 7F by sunrise.  This morning I found the antenna 
> impedance had changed greatly producing a nasty pattern on the scope match 
> traces.  To get the antenna impedance back to where it was at midday 
> yesterday I had to remove two makeshift windings from the matching 
> transformer I was using.  I'm using the same matching transformer on 74 kHz 
> that I use on 137 kHz.  On 74 kHz last fall it took two more turns through 
> the cores than I've ever needed for 137 kHz.   So I just made a few more 
> passes through the cores with the loading coil feed wire.
> 
> The freezing weather probably has improved my signal on 74 kHz but the day 
> before the freeze Hartmut received XRS5 much stronger than last fall.   I 
> suspect this is because the oak trees are now bare.  I like my trees but it 
> sure would be nice to have an open space under the LF antenna top hat wires.
> 
> Here's a picture of the trees with leaves under the top hat wires:
> 
> https://dl.dropboxusercontent.com/u/15095569/w4dex/LF/trees_under_tophat_summer.jpg
> 
> And a picture just now made:
> 
> https://dl.dropboxusercontent.com/u/15095569/w4dex/LF/trees_under_tophat_winter.jpg
> 
> The top hat wires run over the trees with one connecting to a tower at the 
> right side of the metal building on the right.  Another top hat wire runs 
> over the trees to a tower located on the right side of the small brown 
> building.  The ends of the two top hat wire connect together going over more 
> trees.
> 
> Dex
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