[TowerTalk] four square array tuning

[Steve Bookout]

Hello Peter,

I just don't remember it that way.  I guess I'm just getting old.

Another told me that I needed to remove the coaxes and short the box end 
of each coax.

I'll kick it's butt tomorrow.

73 de Steve, NR4M

On 11/28/2016 5:36:PM, Peter Voelpel wrote:
> Hi Steve,
>
> You need to OPEN the unused radiators while you adjust one at the time!
>
> If connected to ground they couple to the radiator in tune.
>
> 73
> Peter, DJ7WW
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Steve
> Bookout
> Sent: Montag, 28. November 2016 23:28
> Cc: towertalk at contesting.com
> Subject: [TowerTalk] four square array tuning
>
> Hello all,
>
> Over the last few years, I have added four square arrays for 40 meters
> and 80 meters, and both work really outstanding.
>
> Recently, I added a third one for 20 meters and am having a difficult
> time with it.
>
> Short version is I resonated each antenna individually, with the others
> shorted with clip leads to gnd, to 13.9 MHz +/-.  The array, as a whole,
> doesn't show a suitable SWR until 15.6 MHz! Like the others I had
> installed, I was expecting a 150 KHz, or so, rise in frequency to
> resonance.  I do understand that it's really all about the power being
> dumped to the dummy load, but the amp is not going to tolerate a 3.5 to
> 1 SWR.
>
> Cables were cut using an AIM antenna analyzer and were double checked.
> All other cable/parts were checked out and shown to be correct.
>
> 80 ground mounted radials under each antenna.
>
> Built just like I did the other two.
>
> Gonna look at it with an O-scope tomorrow and check phase vs freq.  My
> gut feeling is an incorrect value component.
>
> My gut feeling aside, I would appreciate any ideas.
>
> 73 de Steve, NR4M
>
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