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Re: Topband: 8 Circle question

To: Jim Miller <jim@jtmiller.com>, "[Topband]" <topband@contesting.com>
Subject: Re: Topband: 8 Circle question
From: "Joe Subich, W4TV" <lists@subich.com>
Date: Mon, 7 Feb 2022 16:54:15 -0500
List-post: <mailto:topband@contesting.com>

On 2022-02-07 4:45 PM, Jim Miller wrote:
> I was doing the YCCC version which uses 9 antennas to form a 3 element
> endfire in each direction.

The 9 circle (3 element endfire) uses approximately 1:2:1 element
"drive".  Removing one of the end elements will not yield a "clean"
pattern but you would need to model both 0:2:1 and 1:2:0 arrays to
see if the remnant pattern would be acceptable.

73,

   ... Joe, W4TV


On 2022-02-07 4:45 PM, Jim Miller wrote:
I was doing the YCCC version which uses 9 antennas to form a 3 element
endfire in each direction.

I'm obviously limited in space here...

Thanks and sorry for the confusion

jim ab3cv

On Mon, Feb 7, 2022 at 4:43 PM <w5zn@w5zn.org> wrote:

Jim,

Which 8 circle version are you referring to?? The HiZ-8 or the Broad
Side-End Fire (BSEF) 8 vertical array?

The HiZ-8 uses all 8 verticals for each direction but the BSEF array
only uses 4 verticals for each direction.

73 Joel W5ZN


On 2022-02-07 14:38, Jim Miller wrote:
I'm looking at putting out an 8 circle but three of the antennas on the
circumference may need to be seasonally placed since they would be on
my
neighbor's property.

If those three were removed would the remaining 2 elements for each
(opposite) direction left in place still produce a cardioid pattern if
switched toward those directions?  I'd terminate the removed lines with
75
ohm terminations of course.

I would leave the center element and the remaining 5 elements on the
circumference in place year round to minimize seasonal work if needed.

73

Jim ab3cv

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