[TowerTalk] 40 meter Yagis

[john at kk9a.com]

I believe Cushcraft coils have 68 turns of 12AWG wire.  It is easy to  
get SWR bandwidth with lossy coils.

The JK 2el Yagi should give you 2:1 SWRon the segment you require,  I  
have a couple of OptiBeam OB2-40 beams and I have no trouble covering  
the lower phone band, RTTY and CW.  Actually my SWR improves when they  
are combined with a StackMatch however your 106ft tower may be too  
short for efficiently stacking 40m beams.

John KK9A





cqtestk4xs wrote:

Plans are to stack two 2 2-element Yagis.  I've narrowed it down to  
the Cushcraft XM-240 and the JK mid-tri 40.  Realize they are two  
different approaches  to the issue but I have lots of different ways  
to go.  What I am concerned about ...
First, I have spoken to Ken  at JK and he assures me we can get less  
than 2:1 SWR from 7.0 to 7.2.   The Cushcraft's info says 250kHz for  
the XM240. Also wondering if anyone has stacked these and what effect  
it had on the SWR curve.

Bill K4XS