Patrick
Wow thanks a lot for the great info. In particular the 1997 QST article.
Just what I needed for some guidance in how to do this! I have printed
the hQST Article and also saved it on the iPad. I’ll review the AD5X
aricles as well. I recall visiting his sitepreviously
Many thanks for the help and guidance
73 Frank VO1HP
On Mon, Mar 15, 2021 at 22:03 W7TMT - Patrick <W7TMT@outlook.com> wrote:
> I've no source for premade but several links that might help you roll your
> own.
>
> I used AD5X's technique to make loading coils for a shortened 40/15M
> dipole I use on my sailboat. The elements are supported on two Jackite
> telescoping fiberglass poles joined end-to-end in the middle. While the
> poles would easily support a full sized 40M antenna I don't have the room
> due to other vessel masts on either side along the dock. Happy to send you
> a picture of a coils I made if you want. Note that I used his method of
> spacing the windings but didn't need the support structure he describes for
> his vertical application.
>
> AD5X's article is here: http://www.ad5x.com/images/Articles/CoilRevB.pdf
>
> There is another one that may be of interest here:
> "Homebrew Your Own Inductors," by Robert H. Johns, W3JIP, QST, Aug 1997, p
> 35
>
> I used W8WWV's method for winding a single large coil for my 80' high 160M
> vertical over saltwater. I used 1/8" refrigeration tubing for that one.
> His article is here:
> http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/HiQCoil.htm
>
> K7MEM has some nice on-line calculators that might be helpful here:
> http://www.k7mem.com/Site_Map.html#HF%20Wire
>
> Patrick, W7TMT
>
> -----Original Message-----
> From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of Frank
> VO1HP
> Sent: Monday, March 15, 2021 16:50
> To: towertalk@contesting.com
> Subject: [TowerTalk] 40M Loading Coils
>
> Does anyone know of a source of High Q 40M load coils and one could use
> for a DIY Rotary Dipole?
> 73
> Frank VO1HP
>
>
> --
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