Guys,
Thank You for the quick replies that stated the "Shorty-Forty should be doing
much better". That's what I originally thought too or I wouldn't have put up
the antenna.
Some asked "what type of Shorty-Forty"? It's a new Cushcraft XM-240 that was
cut for Mid-Band. The resonant frequency turned out to be 20khz higher than
the chart. (1.2 to 1 SWR).
Tomorrow I will take a look at the Shorty-Forty with a AIM 4170 antenna
analyzer.
Since several people indicated that the Forty-Shorty should be working much
better than it is I need to back track and clarify the ground system of the 1/4
wave vertical. I didn't tell the whole story about the 1/4 wave vertical:
it's mounted 30' out in a saltwater river that has a pretty clear saltwater
path
to Europe, Africa, and South America. (I'm about 2 miles from the Atlantic
Ocean and there are numerous small barrier Islands in between... but it's
mostly saltwater river) The reason I listed "average ground conductivity and a
reasonable radial system" is because the vertical has no radials and just a
single corroded ground strap going down into the salt water... and I've been
told
that isn't sufficient to connect to the saltwater.
Perhaps the vertical is making better connection with the saltwater than
expected? If so, would that be the reason the simple 1/4 wave vertical with no
radials is equal in performance to the Shorty-Forty at 90' on DX qso's... or do
you still think I have a problem with the Shorty-Forty?
One more thing, to the West where the vertical does not have a saltwater
path, the Shorty-Forty is 10-15db better. But since the vertical has no
radials
and no saltwater to the West I'd expect at least that much difference.
73,
Dick- K9OM
In a message dated 12/31/08 11:13:18 PM Eastern Standard Time, RLVZ@aol.com
writes:
> I'm not impressed with the performance of a 2-el. Forty-Shorty at 90' on DX
>
> qso's. While it's great for 1,000 mi. or less... my single 1/4 wave
> vertical
> is just as good on the average DX contact. (since the Shorty-Forty at 90'
> doesn't have any gain at low radiation angles... I guessed I should have
> expected
> as much)
>
> Question: Considering flat terrain, average ground conductivity, and a
> reasonable radial system: do you predict that a 40-m. 4-Square would
> outperform the
> 90' Shorty-Forty by 3-5dB on the average DX qso?
>
> 73.
> Dick- K9OM
>
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