20 uH should be sufficient at the base of a 1/4 wave length vertical.
#4 copper wire is used to connect towers to ground for direct strikes.
Such an inductor can be close-wound with insulated #4 wire, diameter 8", 8
turns.
It should survive intact except for the insulation.
Dave WX7G
On Jul 26, 2012 2:02 PM, "ZR" <zr@jeremy.mv.com> wrote:
> It all depends upon how much survivability you want, nothing will survive a
> direct hit. Any 1.5 to 2.5 mH choke will suffice, just look at the safety
> choke in a commercial amp for the smallest choice.
>
> The big ones are often found in scrapped BCB transmitters and tuning units
> as well as show up at hamfests and on Fleabay as old military gear had
> various candidates.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Phil Clements" <philclements@centurylink.net>
> To: <topband@contesting.com>
> Sent: Thursday, July 26, 2012 3:03 PM
> Subject: Topband: Choke Construction Info Needed
>
>
> >I need to construct a heavy-duty choke to be installed from the feed point
> > of my 160 meter vertical to ground, for static drain and for lightning
> > protection. How large does the wire, form, and inductance need to be?
> >
> >
> >
> > Thanks in advance for your expertize!
> >
> >
> >
> > (((73)))
> >
> > Phil, K5PC
> >
> >
> >
> > _______________________________________________
> > UR RST IS ... ... ..9 QSB QSB - hw? BK
> >
> >
> > -----
> > No virus found in this message.
> > Checked by AVG - www.avg.com
> > Version: 10.0.1424 / Virus Database: 2437/5155 - Release Date: 07/25/12
> >
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
|