Thanks Larry. How do you keep the spacing of the holes exact?
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? The coil has two 4 turn links in the center, by unwinding 1/2 a turn I think, the links are in series for 160 to 40 I think, and in series on higher bands, and tuned with a cap. The outside coil is tapped for various bands and tuned with 4 caps. Balance is important, maybe hard to do with a home brew coil.. 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... I know I will need to make some sort of coil form/support to achieve a good balance. I may try to get about 100 feet of wire fed with home made open wire line, say #14 separated by an inch or inch and a half? About 35 feet of open wire line, then into 2 pieces of coax into the shack and tuner... Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Larry Keith > Sent: Tuesday, January 02, 2007 9:50 AM > To: 'Discussion of AM Radio in the Amateur Service' > Subject: Coil Construction, was: [AMRadio] Fun with 4D32's... > > > > How to make a nice coil of the size needed? > > > Well, I build coils by drilling Polycarbonate ribs, winding > the coil on a > form, letting it expand and then threading the coil through > the ribs. > > I may even have some pics around here.. And, if you are > looking for 3" > coil, 6 TPI, 12 AWG, 10" long -- I probably have one in the > hamfest box. > > 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]
