I'm getting ready to do some tower work at my QTH and I'm thinking about replacing my CushCraft XM-240 with a JK 402 40M beam. I would like to ask if anyone has had any experience with the JK 402 and
The JK will be far superior mechanically. Electrically you will be happy as well. Ken models everything. Id look at the JK402T as the bandwidth is very good. Rich - N5ZC Sent from my iPhone _________
I have two of these on towers. Been through a number of ice storms this winter alone. Zero issues. Recommended. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com Electrically you will be happy
Look at Cushcraft's loading coil and look at JK's. Years ago I bought OptiBeam 40m beams instead of Cushcraft because I liked the high Q coils plus I felt that the antenna was structurally better. If
Go read about turning your XM into a Moxon. No loading junk. http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf <http://www.k3lr.com/engineering/moxon/W6NL_Moxon104.pdf> _______________________
Author: Tony Brock-Fisher via TowerTalk <towertalk@contesting.com>
Date: Mon, 25 Feb 2019 17:02:17 -0500
I would strongly recommend the JK402T over the XM-240. I know you asked about the JK402; but the JK402T is a much better choice - just take a look at the SWR curves of each antenna, and you will see
The JK 402T sure looks a lot like a W6NL moxon conversion no? Steve, WD8NPL I would strongly recommend the JK402T over the XM-240. I know you asked about the JK402; but the JK402T is a much better ch
The JK402T is more broadbanded than the JK402, but the gain is nearly identical. Only .04db difference. If you can swing it, a better consideration is the JK403. The gain jumps up another db and h
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
Author: Tony Brock-Fisher via TowerTalk <towertalk@contesting.com>
Date: Mon, 25 Feb 2019 19:32:22 -0500
I agree, SWR is not a measure of antenna performance. If a driven element is the wrong length, and you can match it with a tuner, you can still get great performance out of a yagi. However: SWR bandw
402T, 402 or xm240? :) Thanks 73 Jim W7RY 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com Electrically you will be happy as well. Ken models everything. Id look at the JK402T as the bandwidth i
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 whic
Momobeam makes a T element 40m beam also, I used one last year operating as PJ4R. I have modeled a lot of 40m beams and it is hard to get a lot of gain with a single antenna. The Moxon is a nice desi
I realize this is getting OT from the original post but if you already own a 2L 40m yagi and are thinking about replacing it because of inadequate F/B consider transforming it into a 2L rotatateable
Picking the "best" 40m beam is very hard on 40m and requires a compromise unless you have a big tower, a big rotor, moderate wind/ice exposure, height limitations and CW/SSB only vs. wideband CW+SSB.
WOW Jeff! There's a lot of info there! Interesting how well the 4 square works compared to the Yagi. Thanks for posting! Thanks 73 Jim W7RY On 2/26/2019 7:48 PM, Jeff Blaine wrote: Picking the "best"
Jim, The 4sq is a great antenna but the yagi beats the 4SQ almost all the time, and often by some to a lot of s-units when it comes specifically to raw signal strength. In some cases the difference
Author: Edward via TowerTalk <towertalk@contesting.com>
Date: Wed, 27 Feb 2019 07:00:42 +0300
The Steppir will give you 180 in a few seconds. Get the DB36! Thanks, Ed _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTa
With a good ground radial system (very important) here at K3LR - the full size 4 square holds its own - almost 6 dB of gain over ground - compared to a stack of W6NL Moxons (185 feet over 120 feet).
Tim makes a good point. The reason a 4SQ is a great DX antenna is that with a quality ground, the power at the lower angles is still significant where a short tower mounted beam drops off fast. The