Topband: Air Wound Coil

[Don Kirk]

To follow up on what Tim said, I often just use PVC pipe for my coil forms
and wind my coils using enamel coated wire (16 or 14 gauge enamel coated
wire), and to keep things simple I often just use close wound turns (no
space between turns).  With no space between turns the coil loss will not
be minimized, but compared with most stations ground systems the additional
coil loss is typically just a small additional loss.

Don (wd8dsb)

On Thu, Aug 30, 2018 at 7:27 AM Tim Shoppa <tshoppa at gmail.com> wrote:

> That is a very nice transmitter tank coil for a kilowatt amplifier. But if
> you have already calculated or measured the inductance you need, you can
> just wrap reasonable gauge insulated wire around any cardboard or plastic
> form you find. I used magnet wire around a cardboard tube. You can see a
> picture of the coil I wound for my 160M antenna match here, along with some
> other more complicated link coupled tuners:  http://n3qe.org/tuners.html
>
> Tim N3QE
>
> > On Aug 30, 2018, at 2:44 AM, MR TREVOR DUNNE <ei2glb at eircom.net> wrote:
> >
> > Hi All
> >
> > I'm looking for an Air wondering coil like in this link,
> >
> > http://www.mfjenterprises.com/Product.php?productid=404-0669
> >
> > I've had one on order from MFJ via a UK company for 4 months now and no
> sign of it, I want to build a at matching network for my 160m inverted T
> using it or something similar,
> >
> > Can anyone tell me where I can get one of these or similar that is in
> stock today,
> >
> > I don't have access to the tools/parts to wind one my self,
> >
> > Thanks
> > Trevor
> > EI2GLB
> > _________________
> > Topband Reflector Archives - http://www.contesting.com/_topband
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>