At 19:35 1/24/2009, you wrote:
>Ahh...this reminds me of an antenna email you sent me a while back. I have
>modelled both superloops (cornerfed flags) and conventional flags with EZNEC
>and according to EZNEC height has very little effect on the patterns. Of
>course it effects the gain since it means a larger antenna. Bruce Conti's DX
>using his superloops is extraordinary, IMHO considering his QTH is somewhat
>inland and that his bearings to the coast to Eur-asia are quite far from the
>Atlantic, and to me this indicates a really good antenna system.
>
>What might be happening at your sunrise is some tilt in arrival angles and a
>different response at those angles from the two antennas.
>
>If your domestic rejection isn't so good with the corner-fed loop, perhaps
>some adjustment of termination would help or just phase it vs the flag ?
Actually the corner fed loop has a vactrol adjustable termination, Neil, so I'm
always trying to minimize splash as I listen. But with the Flag, the front to
back ratio seems to be broader and deeper overall, meaning that listening is
less troubled by splatter at most settings of the termination; it's not a
matter of fine tuning it, and I often leave it at a general setting unless I'm
really working at digging something out.
I've used EZNEC a bit (I'm no expert, mind you), and found that I can't really
verify what I've observed in real life with different sized corner fed loops.
If you can, I'd love to find out how it's done.
best wishes,
Nick
*
Nick Hall-Patch
Victoria, BC
Canada
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