[Lowfer] WE2XGR/2 mid day WOLF test

[John Andrews]

Todd,

I think we've been over this ground before, but here goes again:

The plane of my loop is on a 70/250 degree line (true, not magnetic). 
This produces nulls at 160 and 340 degrees. The nulls are indeed deep, 
as you point out.

By grid squares, your QTH is 856 miles at 218 degrees from mine. That 
means you are 250-218 = 32 degrees off the maximum. The far-field 
pattern of a loop varies with the cosine of the bearing angle, so the 
field strength would be cos(32) = 0.848 times the maximum at 250 
degrees. In dB, that would be -1.4 dB. So, I don't believe that this is 
a big issue in the XES case.

But you are right that you are 185 miles farther away than Dex. This is 
a pretty long surface wave path, and the plane-earth models don't apply.

John A.

On 2/21/2010 2:00 PM, ToddRoberts2001 at aol.com wrote:
> In a message dated 2/21/2010 12:57:29 P.M.  Eastern Standard Time,
> w1tag at charter.net writes:
> Dex,
>
> Interesting, and  completely different from Todd's results in NC. Looks
> like there was more  signal on your XES results. What were the
> differences in the receiving  setups?
>
> John A.
>
>
> Hi John,
> My receiving setup : Icom R75 with CR-282 High-Stability option +
> both 250 Hz filters in the 9MHz and 455KHz IFs. Antenna is a
> Steve Ratzlaff active whip hoisted up 40ft above ground level with
> about 80 ft RG-213 coax back to radio room indoors.
>
> Remember Dex is almost 200 miles closer to XES and on a
> different compass bearing. I still wonder if I could be in some kind
> of a null direction-wise to the XES transmitting loop antenna? I
> am in South Carolina not North Carolina.
>
> Most transmitting loops do have a sharp null at right angles to
> the loop. The null may only be a few degrees wide and I might
> happen to be in that null. Have you ever been able to measure
> the direction of the null from your loop?
>
> I think even Andy KU4XR hears XES better in the daytime than
> I do on LF.
>
> A similar thing happened to me when someone was running an  experimental
> transmitting loop in the Northeast in the Lowfer band years ago. I  just
> happened to be in the sharp null of his loop and could not hear
> a trace of his signal although he was heard widely everywhere else.
>
> 73 Todd WD4NGG EM92OE
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