Topband: T-loaded vertical

[GEORGE WALLNER]

The T has another advantage: it is better on 80 (and 40) if you can match 
it. A 160 m inverted L, with a substantial length horizontal wire, makes a 
poor 80 meter radiator because of high angles. A T will give you more low 
angle radiation.

73,
George,
AA7JV


On Wed, 19 Feb 2020 15:31:21 -0500
  "Ed Sawyer" <sawyered at earthlink.net> wrote:
> Rick said it better.  Thanks Rick.  The T has been a great performer for me in 4 different locations over the years.  I swear by it for 55 - 70 ft vertical sections.
>
> Ed  N1UR
>
> -----Original Message-----
>From: Richard (Rick) Karlquist [mailto:richard at karlquist.com] 
> Sent: Wednesday, February 19, 2020 3:04 PM
> To: Ed Sawyer; donovanf at starpower.net; topband at contesting.com
> Subject: Re: Topband: T-loaded vertical
>
>
> On 2/19/2020 11:50 AM, Ed Sawyer wrote:
>> I have personally found that for Ts that are only 70 ft vertical, like mine, the ground losses of the long topped L are not as desirable as the cancelled out horizontal lobes of the T.  If the T were say 90 ft of vertical, I don’t think the T adds as much value.
>> Ed  N1UR
>>
>>
> When you model an inverted L, the driving point resistance
> goes up when you lengthen the top.  This it appears that
> you decreased ground losses and your efficiency goes up.
> However, if model vertical polarized radiation vs input
> power, you find that your effective efficiency actually
> goes down.
>
> Extending the inverted L top out to where you have a 1/4
> wavelength of wire seems very elegant.  The antenna
> reaches resonance at 1830 and you get a low VSWR without
> using a tuner.  If you model that vs a T vertical, there
> is no comparison. The T wins.
>
> Rick N6RK
>
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