[Elecraft] AX1 dipole

[Fred Jensen]

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.
>



-- 
This email has been checked for viruses by AVG antivirus software.
www.avg.com