[TowerTalk] Change in SWR

[n8de at thepoint.net]

Were both measurements made with the SAME ORIENTATION of the yagi?

Looks to me like the inverted V is interacting with the yagi, so  
orientation of the yagi would make a big difference.

73
Don
N8DE


Quoting Doug Scribner <dscribner at myfairpoint.net>:

> I know, I probably should not get too hung up about this, but...
>
> Six weeks ago I finished my second tower... 66 feet of guyed Rohn   
> 45. I have a Mosley Pro-67B @ 68 feet and an 80 Meter Inverted V,   
> with the apex at 64 feet.
>
> Following the completion I went through all of my antennas and   
> checked the SWR at various places in the bands. I wanted a   
> "baseline" to make comparisions to should anything go wrong.
>
> About a week ago I made a few spot checks. The only significant   
> change that I found was on the Pro-67 and ONLY on 40 Meters.
>
> Initial check - 7.0 - 1.6, 7.1 - 1.4, 7.2 - 1.5, 7.3 - 1.5
>
> New check - 7.0 - 1.8, 7.1 - 1.9, 7.2 - 2.2, 7.3 - 2.1
>
> All other bands/freqs are VERY close to what they were initially.
>
> On the Mosley, the 40 Meter driven element is shared with 12 and 17.  
>  The director is shared with 10, 15 and 20. My guess is that a yagi   
> problem would affect these other bands.
>
> The only addition I have made is to add a 160 Meter Low Dipole for   
> receive. It is 10 feet high with the feedpoint at the tower.
>
> Is there a chance that it is interacting with the yagi 58 feet above  
>  it? I grounded the feedpoint of the dipole with no change.
>
> I know I should drop the dipole to the ground but it was such a   
> hassle snaking it through the woods I have held off doing that.
>
> Any advice?
>
> Thanks and 73
> Doug - K1ZO
>
>
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