[TowerTalk] JK 402 versus CC XM-240

[Grant Saviers]

A 27 MHz modest dip is real.  At one time I considered other antennas on 
the same mast and modeling showed little interaction.  Mine was 11' 
below a 86' Tornado tuned 80m dipole (EF180C reworked) element parallel 
and there was no interaction that I could measure.

Those antennas are on a HDX589.  I use a boom lift. The other one I 
built went up with a crane.  It's over 7ft between the inside of the T 
elements so with care on a calm day it should go on a side mount from a 
tram or crane.  A tilting boom might be a way to assemble the elements 
on the tower.

It fits in about a 50ft square.

Grant KZ1W



On 2/27/2019 8:22 AM, john at kk9a.com wrote:
> There is no question that the 40m Moxon is a great design however it is 
> not a small 40m beam and as you mentioned it can be difficult to 
> install. Side mounting them might be a real challenge. I wonder how the 
> Moxon gets along with other antennas?  From my NEC2 model (which is 
> inaccurate for this design) it appears to be resonant on ~27 MHz.
> 
> John
> 
> 
> Tom W2SC wrote:
> 
> As Grant indicates, I use two W6NL Moxons at 8P5A.  They are on 
> different towers and are not phased.
> 
> Overall, I could not be happier with them.  While I do not have an 
> antenna testing range, they seem to have a discernible pattern across 
> the whole band an have an SWR below 1.4:1 at the band edges.  I seem to 
> be able to work people with them
> 
> The prior antenna was a 3L Hygain that I struggled to keep working.  I 
> took the driven element down at least 30 times.  Plus, it was not clear 
> how broadband it was, either in terms of pattern, and certainly not in 
> the case of SWR.
> 
> I can’t speak to the JK antenna, but the W6NL has held up well so far in 
> a very corrosive, but no ice environment. With the Tbars it is not an 
> easy antenna to install without a crane.  Twisting it up through the guy 
> wires was extremely difficult and required some steps I would not 
> recommend.
> 
> Thanks to W6NL for his technical contribution
> 
> 73 Tom W2SC 8P5A
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