[Lowfer] WM "scribbling...effects of temp change on antenna current...

[Bill Ashlock]

Mike and Ralph,

As reported last night the variance in antenna current ended with the mysterious return to the original capacitance value for resonance at 185.300 along with original input current. A few checks today also revealed no change from yesterdays values so the problem could be in the final - possibly one of the resonant capacitors. These loops tend to be very insensitive to their environment so that's why this is particularly interesting to me.

BTW I repaired the "open" in the coax to the receiving antenna and it wasn't due to driving over it with the tractor. There is a break in it somewhere under a pile of junk construction wood that now covers the lead-in along with a covering of ice and snow... so I just wired around it.

Bill



> Date: Sun, 17 Jan 2010 14:30:50 -0600
> From: we0h at gmx.com
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] WM "scribbling...effects of temp change on antenna	current...
> 
> hi hi...No doubt. It's a weird one for sure. I have been putting up with 
> it forever. I am guessing something to do with the trees. The transition 
> from non-frozen ground to frozen ground is dramatic here too. The 
> transition temp of 32F is night verses day on 1750 meters. Not so much 
> on 600 meters. Haven't tried 2200 meters but will do so when the Loran 
> stations go bye bye.
> 
> Mike
> WE0H
> 
> 
> W5JGV-Ralph wrote:
> > Well now, ya' got me on that one!  Being a naturalized Southerner after
> > all these years, I kind of forgot that water comes in other forms than
> > liquid.
> > 
> > This is the first year that I have been at this QTH when it has become
> > cold enough to actually freeze the earth to a few inches depth.  That
> > did cause a major change in the tuning of my antenna until it thawed out
> > again.  But that does not explain the diurnal variation you are seeing.
> > I'll think about that and see if I can come up with anything.
> > 
> > 73,
> > 
> > Ralph   W5JGV - WD2XSH/7
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