It is clearly only additional ground return loss that is giving that
effect. You could achieve the same broadbanding effect except with
uniform directivity by just putting a 17 ohm resistor in series with the
feedpoint ... although I suppose the point could be made that dirt makes
a cheaper dummy load than a high power resistor.
73,
Dave AB7E
On 5/12/2011 1:07 PM, Alex Malyava wrote:
> I think the article in question was in NCJ describing inverted L antennas
> for 160 and 80.
> It surprised me too. The main point was to put only one radial to have
> antenna close to 50 ohm so no matching network is needed otherwise "if you
> put too mane radials you will need an antenna tuner" :)
>
> AM
>
>
> On Thu, May 12, 2011 at 3:56 PM, Gary Schafer<garyschafer@comcast.net>wrote:
>
>> The question is "gain over what"?
>>
>> Gain over a vertical with 36 radials? I wouldn't think so!
>>
>> 3 dB of gain in the direction of the radial over the gain in the opposite
>> direction? Possibly. Even though the whole thing may be down 6 or 8 db over
>> a vertical with a large number of radials.
>>
>> 73
>> Gary K4FMX
>>
>>> -----Original Message-----
>>> From: towertalk-bounces@contesting.com [mailto:towertalk-
>>> bounces@contesting.com] On Behalf Of Tom Osborne
>>> Sent: Thursday, May 12, 2011 3:23 PM
>>> To: Towertalk
>>> Subject: [TowerTalk] Vertical with 1 radial
>>>
>>> Blank
>>> Hi All
>>>
>>> In the past 2 months, I have seen two different articles in ARRL
>>> publications that say a vertical with 1 radial has gain in the direction
>>> of
>>> the radial. One said 3 db. Evidently Eznec confirmed this.
>>>
>>> Why the heck do I bother putting down all those radials under my
>>> verticals??
>>> According to one article, 1 radial is best because it gives the antenna
>>> a
>>> real wide bandwitch, SWR is close to 50 ohms, and has gain in the
>>> direction
>>> of the radial. Seems like those symptoms would give loss not gain.
>>>
>>> Is this true, or is the ARRL just publishing anything now? Sure is
>>> different from anything I've ever known about verticals.
>>>
>>> Seems like I should be able to put up an antenna with 1 radial on my
>>> rotor
>>> and I could point it just like a beam. Fill me in. 73
>>> Tom W7WHY
>>>
>>>
>>> _______________________________________________
>>>
>>>
>>>
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>>
>>
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