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" <[email protected]> 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" <[email protected]> > To: <[email protected]> > 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
