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@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@telus.net> wrote:
>>
>> Date: Thu, 28 Nov 2019 13:58:27 -0400
>> From: Herbert Schoenbohm <herbert.schoenbohm@gmail.com>
>> To: towertalk@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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