[Elecraft] 80 Meter Verticals

[Walter Underwood]

The fan antenna over my house is multiple resonant dipoles on different bands with a common feedpoint. Those work fine.

You can also have a driven dipole with a parallel coupled resonator of a slightly different length. This will give an antenna with a second near-resonant point and lower SWR between the two points. The coupled wire is continuous. It is not broken in the middle like the driven dipole.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Mar 1, 2017, at 8:21 PM, Ron D'Eau Claire <ron at cobi.biz> wrote:
> 
> I know them as fan antennas. The old UHF "bow tie" TV antennas are a good
> example. 
> 
> The discussion about radiation resistance vs. feed-point resistance is
> specious. When feeding more than one resistance in series, such as a
> monopole impedance and a ground impedance, Ohm's law prevails. The higher
> resistance consumes the most power. So techniques to reduce the ground R or
> increase the antenna feed point R all contribute to more radiated power. 
> 
> 73, Ron AC7AC
> 
> -----Original Message-----
> On 3/1/2017 11:17 AM, Walter Underwood wrote:
>> You can also use close-spaced parallel elements that are resonant at
> slightly different frequencies than the driven element. This is a different
> way to make a broadband antenna. This design has a name, but it escapes me
> right now.
>> 
>> wunder
>> K6WRU
>> Walter Underwood
>> CM87wj
>> http://observer.wunderwood.org/ (my blog)
>> 
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to wunder at wunderwood.org