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
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
