[TowerTalk] JK C3S WARC Modifications

[Tom Hellem]

Herb-
Now that I know what your game plan is, I will try to model it for you and see  how EZNec says it will perform. My copy is only NEC 2 and I have heard NEC4 does a better job but I don't have a couple kilo-bucks to shell out so it will have to do. I have AC6LA's optimizer which will make it easier.

BTW I don't see any reason why your old F12 element brackets can't be relocated on the boom should it prove necessary. If your beam is built the way several that I have had were, all you would need to do is drill out the rivets and move them.
I will try to get this done before the weekend is out. Please if someone else has already done it, let me know today if you can

Tom H
K0SN

> On Nov 29, 2019, at 12:10 PM, Herbert Schoenbohm <herbert.schoenbohm at gmail.com> wrote:
> 
> Exactly Jim...that is what I want to do.  Except I was going to make the
> 20-meter elements shorter for 18Mhz and the 10 meter element longer for 24
> while leaving the 15 meter element the same.  This would give me a slightly
> smaller and lighter antenna for 24 15 and 18.....although I really don't
> need 15.
> 
> Herb, KV4FZ
> 
>> On Fri, Nov 29, 2019 at 1:41 PM Jim Thomson <jim.thom at telus.net> wrote:
>> 
>> Date: Thu, 28 Nov 2019 13:58:27 -0400
>> From: Herbert Schoenbohm <herbert.schoenbohm at gmail.com>
>> To: towertalk at contesting.com
>> Subject: [TowerTalk] JK C3S WARC Modifications
>> 
>> <I have a C3S tribander which I seldom use except when on WARC bands.  It
>> is
>> <useable there but not as good as I think it would be modifying it for 24
>> <and 18Mhz.  I wonder if anyone has tried that?  I don't care about 10 and
>> <15.  I think by just changing the dimension, i.e making the 10-meter
>> <elements longer for 24Mhz  and the 15-meter element shorter to cover 18
>> <Mhz, would possibly work.  Is there anyone who has done this successfully?
>> 
>> <Herb, KV4FZ
>> 
>> ##  contact  Ken  at JK  ants.  No  need to  buy  a megabuck  new
>> yagi....then  ship it  to KV4  Land.
>> The  issue  with the  F12 els is.... the brackets for  ele  to  boom  are
>> fixed  In  place.   The  saving grace  is  the
>> 18  +  24 mhz  bands are  only  100 kz  wide.
>> 
>> ##  BTW, ur 15M  eles  would  have to be made  LONGER, not  shorter.   I
>> would  shorten the  20M
>> eles..and   relocate them  to  where the  15   els  currently  reside on
>> the  boom.
>> 
>> ##  what  u  propose is  easily  doable..at  zero  expense.
>> 
>> ##  Then  u  end  up  with  a 18 +  24  mhz  duobander...with  flat  swr
>> +  good  gain +  good  FB.
>> 
>> Jim  VE7RF
>> 
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