[TowerTalk] Re: Force12 C3XL : help

[force12@interserv.com]

Good afternoon.

Appreciate all the information.

This situation still is unique. This means I have no knowledge of this 
happening...on anybody's antenna. So, let's continue to see what this can 
be.

As mentioned, the reflector can be grounded, or not grounded to the mounting 
(boom). It makes no difference. So, having a situation with high VSWR 
because of something at the center of the reflector is very strange.

Best suggestion is:
	Remove the insulator and clamp the element directly to the mounting.


The model for this antenna shows the following:
	A)	standard, with all elements, feed point on 20 mtrs is:
		29 ohms -j10  (1.84:1 before matching)
	B)	with 20 mtr reflector removed, feed point is:
		41 ohms -j22  (1.7:1 before matching)
The hairpin match will step up the feedpoint. It does not look like it could 
move it up to 3:1 even with the reflector removed.


Please let us know the result of grounding the reflector. It should be like 
it was originally.


Have a good day and 73,
			Tom, N6BT
			Force 12 Antennas and Systems
			(Home Page   http://www.QTH.com/force12 )



--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search