[Elecraft] AX1 dipole

[Fred Jensen]

The Franklin is two vertical, co-linear half-waves fed in-phase.  Google 
will offer way more than you want to read.  Obviously a large structural 
challenge for a full-size one at MF.  The one I built as a test was 
heavily loaded and worked about like EZNEC-4 predicted.  I think it's 
insensitivity to "ground" may be one reason it works well, but that's 
just a guess.


73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

Dan Presley wrote on 9/29/2022 12:20 PM:
> Fred-can you share details on this antenna? Not familiar with it. Thanks.
>
> Dan Presley 503-701-3871
> danpresley at me. com
> N7CQR at arrl.net
>
>
>> On Sep 29, 2022, at 12:08, Fred Jensen<k6dgwnv at gmail.com>  wrote:
>>
>> I've long wondered why hams haven't done more with Franklin verticals?  KFBK [1530 kHz in Sacramento] uses one located in the southern end of the Sacramento Valley, and it's known as a Flame Thrower.  I think KNBC [680 kHz?] in SF had one back in the 50's sometime too.  They're big at MF, but much more tractable at HF, and they are amenable to loading techniques.  I built one [fairly heavily loaded] out of Buddipole parts I had, and its performance, particularly when I was still activating summits, was surprising.  Like a small loop, the Franklin pretty much ignores ground ... although KFBK's probably likes being located in rice fields filled with water. 😉
>>
>> 73,
>>
>> Fred ["Skip"] K6DGW
>> Sparks NV DM09dn
>> Washoe County
>>
>> Jim Brown wrote on 9/29/2022 11:28 AM:
>>> David,
>>>
>>> I've published a LOT of work on concepts like this.
>>>
>>> This ran in National Contest Journal about six years ago. It's based on extensive modeling, and was peer reviewed.
>>>
>>> http://k9yc.com/AntennaPlanning.pdf
>>>
>>> This was added to the ARRL Handbook or Antenna Book several years ago.
>>>
>>> http://k9yc.com/VerticalDipole.pdf
>>>
>>> This is an application of the above technique.
>>>
>>> http://k9yc.com/80M-FDVertical.pdf
>>>
>>> N6BT (original Force 12) has done a lot designs for monoband and multiband verticals that are loaded dipoles. The multiband Cushcraft R-series and Hi-Gain AV-series multiband verticals (companies bought out by MFJ many years ago) are loaded dipoles.
>>>
>>> 73, Jim K9YC
>>>
>>>> On 9/29/2022 11:09 AM, David Gilbert wrote:
>>>>
>>>> You're talking about a horizontal pair of AX1's ... I asked about them oriented vertically.  That wouldn't require them to be as high above ground as you mention and would still allow them to be carried pedestrian mobile.
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