The antenna is designed and built and ready to raise. It was just a simple
question about if the trap is included in the resonant length or not.
I have worked 308 countries on 30 meters with trap verticals so I am not
concerned about it's effectiveness.
Dan Schaaf
K3ZXL
"In the Beginning there was Spark Gap"
www.k3zxl.com
----- Original Message -----
From: <n8de@thepoint.net>
To: <towertalk@contesting.com>
Sent: Monday, April 19, 2010 12:20 PM
Subject: Re: [TowerTalk] 1/4 wave vertical question
> Forget the trap idea.
>
> Put a 1/4-wavelength of 75-ohm coax between your 50-ohm feedline and
> the feedpoint. The antenna will work on both bands if you use a tuner
> at the rig.
>
> Don't ask me why, but I've worked almost 200 countries on 30m with a
> good signal using the above antenna.
> Don
> N8DE
>
>
> Quoting Ron W8RJL <youngron@verizon.net>:
>
>> Rick, you are correct, I was in a rush and had my thinking backwards.
>>> From the feed point to the trap should be 1/4 wave for 30 meter ~23 feet
>> depending on conductor diameter.
>> The trap should be resonant at about 10 MHZ. It is better to error on the
>> low side.
>> On 40 meters the 23 foot section plus the inductance of the trap plus
>> what
>> is above the trap resonates on 40 meter.
>> Feed impedance depends on many factors including the numbers of radials.
>> 73, Ron W8RJL
>>
>>
>> ----- Original Message -----
>> From: "Richard (Rick) Karlquist" <richard@karlquist.com>
>> To: "Tower and HF antenna construction topics."
>> <towertalk@contesting.com>
>> Sent: Monday, April 19, 2010 1:52 AM
>> Subject: Re: [TowerTalk] 1/4 wave vertical question
>>
>>
>>>
>>>
>>> Ron W8RJL wrote:
>>>>> From the bottom of the vertical to the bottom of the 40 meter trap
>>>>> will
>>>>> be
>>>> about 32 feet depending on the diameter of the vertical. The larger the
>>>
>>> The trap should be a 30 meter trap located about 24 feet up.
>>>
>>> Rick N6RK
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>>
>>
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|