Larry, Where do you get the strips of plastic to drill and pass the coil through?
Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Larry Keith > Sent: Tuesday, January 02, 2007 1:19 PM > To: 'Discussion of AM Radio in the Amateur Service' > Subject: RE: Coil Construction, was: [AMRadio] Fun with 4D32's... > > > > > > Thanks Larry. > How do you keep the spacing of the holes > exact? > > I have a "homebrew" table that attaches to my small drill > press. The table > has a fence and a stop. I use spacers (plywood > strips)stacked against the > stop. I drill a hole and remove a spacer, reposition the > work, drill a > hole, etc.. > > > Since the handbook says the antenna tuner is good > for 250 watts of AM, I would need to at least double > the size of things, from the #14 at 8 tpi, about > a foot or more long, to ? > #10, or #8, or thin copper tubing? > > I have built coils using #12, #10, #8 and using copper > tubing, using the > same construction methods. > > > > > Balance is important, maybe hard to do with > a home brew coil.. > > Why? > > > > I did not study the text, not sure if its supposed to > cover 160 meters, but if I built one, might > as well include 160... > > You just doubled the coil size, if it wasn't designed for 160... > > > > I know I will need to make some sort of coil > form/support to achieve a good balance. > > Polycarbonate sheet.. Mounted on stand-off insulators.. > > > 73, > > Larry > KQ4BY > > > > > ______________________________________________________________ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
