I hope you have a 4:1 Unun at the antenna. I am going to play with one of these antennas at 31ft and 43ft for an antenna down at J6 as they are light and easy to take and seem to work on all bands. It would make an ok backup/secondary antenna.
On 9/18/2011 10:49 AM, Phil & Debbie Salas wrote: > "Just curious if anyone else is using the K3 internal tuner with a 43' > vertical. Will handle all the bands 10 - 160? Or do I need to purchase > an external tuner. I'm about to put one up to get me on the air. This > will be a temporary antenna while I build the antenna farm here at the > new qth. What I would really like is the new Elecraft tuner located at the > base > of the vertical. I have an sgc-239 that I used at my last qth, and it > was located at the base of the vertical. Worked great." > > The K3 internal tuner may or may not be able to tune 160-meters - I suspect > it will have no problem on 80 meters. It depends on the length and loss of > your feedline. The 43-foot vertical has HORRIBLE SWR on 160- and 80-meters. > And so your line loss will be very high. You need about 55uhy of total > inductance to match the 43-footer on 160 meters at the antenna base which I > believe is more than the K3 tuner has available. But if the feedline length > and loss is just right, the matching range of the K3 tuner may be sufficient > on that band. Incidentally, the SGC-239 does not have enough inductance to > match the antenna on 160 meters. If you were able to do this, you were > simply matching into the internal losses in the tuner. I did an evaluation > of the SGC-230 with the 43-foot vertical (info on my website at > www.ad5x.com), and as part of that I found that the SG-230 would match into > an open circuit. Obviously it was matching into its own internal losses. I > built an external inductor for use with 43-footers that worked well with my > MFJ-927. > > The new MFJ remote autotuners look interesting, but they also do not have > enough inductance to match a 43-footer on 160 meters. It will be > interesting to see if the remote KAT500 will have enough inductance to match > a 43-footer on 160 meters. Meanwhile, if you use your 43-footer on 160- and > 80-meters (like I do) consider base matching on those bands. See the base > matching article on my website. > > Phil - AD5X > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- J6/W0MU November 21 - December 1 2011 CQ WW DX CW ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
