[Elecraft] EFHWD

[brian]

Yes, if you can feed power to it.

I don't understand all the innuendo about what works when some numbers 
can put things into perspective.

Here are some EZNEC numbers.  A 33' (1/2 wave on 20) wire on 20M with 
one end at 2' and the other at 25'

Feedpoint % from end    Z           SWR
1.2                    2445-9196j   >100
6                      746 -919j     39
11                     301 -342j     14
15                     230 -175j      7

This strongly indicates that some counterpoise of about 10% above the 
ground (remainder of 33' in air) should be used to bring the Z down to 
reasonable values for matching.  Regardless, there will be a large 
complex value of Z to null out.

73 de Brian/K3KO




On 2/12/2017 16:19 PM, Don Wilhelm wrote:
> Brian,
>
> I repeat what I have posted several times:
> A resonant dipole radiates the same no matter where it is fed - center,
> end or anywhere in between makes no difference in the radiation pattern.
>
> In other words, a dipole is a dipole, is a dipole.
> The dipole refers to the current/voltage distribution, and not to how it
> is fed.
>
> 73,
> Don W3FPR
>
> On 2/12/2017 11:03 AM, Brian Pietrzyk wrote:
>> Hi John,
>>
>> This is great! Thank you for taking the time to write this.
>>
>> Having only experimented with centre fed dipoles as base antennas over
>> the years these end feds open up a whole new set of placement
>> possibilities for me. I have to confess prior to this I thought of
>> (random wire) end feds as non resonant compromise antennas. Yet
>> another shattered paradigm for me.
>>
>> Come spring I will in fact be trying these out in place of my current
>> dipole. I'll source and order the torriod cores now and I will surely
>> keep you posted. Also I think a 160m end fed will be a worthy project
>> this summer.
>>
>> So height above ground of the end feds will have the same effect on
>> take off angle as it does with dipoles?
>>
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