[TowerTalk] JK 402 versus CC XM-240

[Tom Georgens]

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


Sent from my iPad

> On Feb 25, 2019, at 10:19 PM, Grant Saviers <grants2 at pacbell.net> wrote:
> 
> All true, Jim.
> 
> I think Ken of JK really knows his stuff re antenna design both RF and mechanical.  I trust his NEC4 patterns and plots.  I have confirmed with NEC4 the design of the JK 80m 2L beam which I own. The 80m 2L is awesome mechanically.  At 157' not much gets missed.
> 
> As well, re W6NL's design of the 40m Moxon being discussed.  I built/own two.  Also NEC4 verified.  K3LR and 8P5A use them.  The JK Moxon looks like a close derivative.
> 
> Grant KZ1W
> 
>> On 2/25/2019 15:37 PM, Jim Brown wrote:
>>> On 2/25/2019 2:02 PM, Tony Brock-Fisher via TowerTalk wrote:
>>> just take a look at the SWR curves of each antenna, and you will see that the JK402T is much more broadbanded. 
>> CAUTION -- SWR is NOT a measure of antenna performance. GAIN and the overall pattern ARE. SWR tells us nothing about either. An unterminated 1,000 ft spool of RG58 will read 1.1:1 on 40M. :)
>> I'm not suggesting that the JK antenna isn't better, but SWR ONLY tells us about SWR, and whether matching is needed to keep the power amp or output stage happy enough that it will drive it to full power. That's certainly a good thing, but it doesn't tell us how well the antenna works.
>> 73, Jim K9YC
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