Wow!! Thanks for all the great ideas, and comments. As is, I think I have a spot tapped that works well, however using such little coil tells me there may be some side effect. No, there is absolutely no heat. Never has, even with full legal limit AM 100% modulated for 10 minutes.
I took a photo taken this morning of the tuner here that should give some idea of the size. I put a shot glass in the photo for scale: http://w5ami.net/images/TUNER.JPG The things that come to mind for me are where I am tapping the parallel cap, and my feedline length. As you can see, there is a lot of extra coil beyond where I currently have the taps for 75 meters. That extra coil will never be used on the ham bands. I think I will try tapping the cap out several turns from where the feedline taps are, but not at the ends of the entire coil. I will try this after setting the 75 meter taps at about 22uH and see if there is any indication of resonance. I think having the cap and feedline tap in the same places on the coil is a possible problem. If that doesn't seem to help, I will take a look at my feedline length. 73 & Thanks for the help! Brian / wa5am PS: John, sure would have been nice to meet up for a cup of coffee had I known you were close by! On 8/15/09, John Coleman <j...@pctechref.com> wrote: > > Thanks Bob > Just to add a little something: Someone said earlier, something to > the effect, that there may be a non resonate antenna and feed line > combination that can cause a lot of trouble. This is very true because then > the L and C of the tuner must add or subtract reactance in order to make the > whole system resonate. This is often more easily done when you have a lot > of capacitance to work with. So having a high Q tank in the tuner has its > advantages. > John, WA5BXO > > ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
