Hey Brian, I wanted to just chime-in and tell you that I had the same sort of experience with my "big" link coupled tuner. I have been concerned that the tap points for the open wire line seemed very near the center of the coil and seemed to result in much less L than what I expected would be the proper setting. It appeared that the amount of coil needed was way too small. I suppose I should have been satisfied that it provided an apparent good match, but I was still concerned about the values being different that what I expected. I'm using a large 4" diam. Cu tubing coil and a link wound from the (insulated) center conductor of poly-type RG-8U coax wound around the center turns. I put a large multi-gang loading type variable cap in series with the link to allow tuning it. The big tuning cap (250 uF) is across the whole coil which is much more L than even what I need for 160M. Anyway...can't argue with success....it works! 73, Jack, W9GT
--- On Mon, 8/17/09, WA5AM <[email protected]> wrote: From: WA5AM <[email protected]> Subject: Re: [AMRadio] Classic Link Coupled Tuner To: "Discussion of AM Radio in the Amateur Service" <[email protected]> Date: Monday, August 17, 2009, 12:22 PM That's a great story John!! Yep, for the time being I'm going to leave the tuner well enough alone... We are building a new house down on my east property smack in the woods. Once the house is complete and ready to move in, I will begin getting my AM rigs back up and running. I've got to move this Gates BC-1T too. It's going to be a booger. it will be the first project after the move to get going on 75 and 160. Searcy is very close to us. Only about 35 minutes from here. Next time you are up, come by and see the new shack. By the way, for all interested, always keep an eye on the lookout for these large old link coupled coils like the one in my photo. Also for the large "slip stator" caps. You can build a tuner for balanced feedline, 450 ~ 600 ohms, that will far surpass the abuse a modern tuner that uses the toroid baluns can take. I went to ladder line 10 years ago and never went back to coax for any lowband antennas. 73 Brian On 8/17/09, John Coleman <[email protected]> wrote: > > Hi Brian: ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] 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 ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] 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
