I’ve seen sites where someone improved on the original design with high-Q coils
and it looks enticing, but I recall that it wasn’t trivial because the
distribute capacitance also changed, which led to what amounted to pretty much
a re-design. The result was apparently excellent, but it wasn’t plug-n-play.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Sep 27, 2020, at 2:59 PM, Jim Thomson <jim.thom@telus.net> wrote:
>
> Date: Sat, 26 Sep 2020 21:10:47 -0400
> From: <john@kk9a.com>
> To: <towertalk@contesting.com>
> Subject: Re: [TowerTalk] 40 meter beam
>
> <I believe Cushcraft uses 68 turns of 12 AWG wire. There are much more
> <efficient loading coil designs that are also more durable.
>
> <John KK9A
>
> ## https://www.qsl.net/ve6wz/CC_coil.html Just about anything is better
> than 68 turns of 12 gauge magnet wire..with turns butted tight..
> The latest version of the coil software by k6sti is called 3.95
> http://ham-radio.com/k6sti/ scroll to bottom of left side of page.
> Coil Inductance and Q Calculator 3.95
>
>
>
> .75 inch OD aluminum tubing, like 3003 is very easy to work with.
> Mcmaster carr sells it, and other sizes.
>
> Jim VE7RF
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|