[TenTec] New and Improved Terminology (NVIS origins)

[Rick - NJ0IP / DJ0IP]

Ken's question is important.

What I have seen (but not measured) is that if I raise the bottom of the
vertical dipole about 4 ft. off the ground, it seems to work better than
when the bottom is sitting about 1 ft. off the ground.  For home use I had
it about 7 ft. off the ground.
This is a gut feeling, with NO scientific evidence to back it up.

>From what I've read (Cebik), the difference shouldn't be more than 1dB, "if"
the base of the VD is as high as the feedpoint of the other vertical.

If the VD is mounted with its bottom less than 1 ft. off the ground, then I
can believe the 6dB is accurate.

73
Rick

-----Original Message-----
From: tentec-bounces at contesting.com [mailto:tentec-bounces at contesting.com]
On Behalf Of Ken Brown
Sent: Wednesday, January 05, 2011 11:14 PM
To: N4PY2; Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] New and Improved Terminology (NVIS origins)


> Years ago I had a vertical dipole for 40 meters and a raised vertical with
3 
> radials 10 feet above the ground.  The raised vertical was about 6 DB
better 
> than the vertical dipole for European stations.  The raised vertical was
10 
> feet off the ground at the bottom with 3 full size radials (33 feet long).

> I like raised verticals.
>
>   
How high above ground was the dipole? How long was the dipole? A half 
wavelength?

DE N6KB
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