Re: LF: T/A DK7FC

To:	[email protected]
Subject:	Re: LF: T/A DK7FC
From:	Bill de Carle <[email protected]>
Date:	Fri, 21 Oct 2011 11:41:40 -0400
In-reply-to:	<002c01cc8fdc$6720c640$8d01a8c0@JAYDELL>
References:	<[email protected]> <[email protected]> <002c01cc8fdc$6720c640$8d01a8c0@JAYDELL>
Reply-to:	[email protected]
Sender:	[email protected]

At 06:30 AM 10/21/2011, Jay W1VD wrote:

Stefan

Capture of your signal fading into the sunrise at about 0640Z at http://www.w1vd.com/grabber.html .

Signal was already very strong when I switched the receiver on about 2230Z but went into a very slow fade that lasted until about 0230Z. Signal popped back up and was strong the rest of the night until fadeout as shown above. It was interesting that VE2IQ had copy throughout the fade noted here. There was no QRM or unusual static conditions to limit receiving 'sensitivity' so propagation is likely to blame. I'm curious what Bill is using for his receiving antenna ... maybe he will chime in. The antenna here is the large format K9AY.

Hi Jay, Stefan, group:

Stefan was received here reasonably well all night. I uploaded one of the captures this morning: http://www.nrtco.net/~ve2iq/grabs/
I was using a couple of orthogonal loops for receiving: loops are rectangular and each has approx 100 feet of finely-stranded wire (not Litz), about 0.25 inch diameter with heavy insulation. The rectangles are roughly 30' horiz by 20' high with bottoms about shoulder height above the ground. I support them from maple trees with those black rubber tie-down straps truckers use. The "NS" loop orientation is actually 27 degrees; the "EW" orientation is 117 degrees. The NS loop is slightly larger in area than the EW. To receive from Heidelberg I connect the loops in series to favor NE/SW. The system is tuned (Q only 35 otherwise too much freq change with temperature). I have noticed that you and I often see similar QRN when trying to receive Stefan's signal. One difference might be that I have essentially no response from the E-field, another might be that I am sensitive to signals arriving from two
directions and you can null out one direction.

I read with some interest about your success with the K9AY and gave it a try but it doesn't work well here because the loops are in some heavy bush, not in the clear. While it is easy to obtain a good ground in the woods there is very little E-field available because the trees are much taller than the whole antenna. I suppose at LF it might sorta work with an E-field probe closer to the house instead of using the E-field pickup of the loops themselves, but there are issues with that approach so I never bothered to try it.

73,
Bill VE2IQ

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