[TowerTalk] Multiband antenna with non-resonant trap

[Roger D Johnson]

Reg, G4FGQ, has a program to do this on his website. Look for:

NOTATRAP

73, Roger


Tod Olson wrote:
> I have some concerns about this article. I had gone through it several times
> and tried to contact Yardley since he and I had spoken about other thing
> before. Regrettably, he had reached the point where he was unable to
> communicate and shortly afterward died.
>
> If anyone has time to check the equations and verify that they are correct,
> I for one would like to be advised. It would be nice to know that one can
> really use the method to get useful antennas. As I recall, he selected a
> 'geometric mean' frequency for the resonant point and then designed traps
> that would respond to the reactance at the desired frequency.
>
> Tod, K0TO
>
>  
>
> On 5/26/13 1:50 PM, "Bob W5RN" <rj.newton.w5rn at verizon.net> wrote:
>
>   
>> It was Ham Radio
>>
>>      Designing Trap Antennas: A New Approach
>>      Yardly Beers W0JF
>>      Ham Radio, Aug. 1987, Vol. 20, #8, P. 60
>>
>> I have the issue someplace but could not put my hands on it. Just found it!
>>
>> If you need a copy, I can scan and send it.
>>
>> Bob Newton W5RN
>>
>> On 5/25/2013 9:36 PM, Hans Hammarquist wrote:
>>     
>>>  This might be the wrong forum but does anyone remember an article in QST (or
>>> maybe QEX) of how to make multibands antennas using LC traps where the traps
>>> resonance frequency is not at the operating frequencies. By putting an LC
>>> circuit somewhere in or close to the center of a vertical you get two
>>> resonances, one where the C-part act and increase the resonance and one where
>>> the L-part decreases the resonance frequency.
>>>
>>>
>>>  Anyone?
>>>
>>>
>>>  73 de,
>>>
>>>
>>>  Hans - N2JFS
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>>>
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>>     
>
>
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