Hello Barry Since your dipole will be indoors, I would suggest making it a bit longer, closer to 33 ft.
Run the first 23 feet as you plan, with the feedpoint in the center. At the ends, let the extra wire extend down 1 foot. The bring the remainder back toward the center, keeping the 1 foot spacing. Use something like wooden dowels or plastic rods to keep the folded back sections parallel to the main part of the dipole. This will give you a 20m dipole, a 15m 3/4 wave dipole, and 2 halfwaves in phase on 10m. If you use 450 ohm window line, or 300 ohm TV twinlead of good quality, you should be able to tune this on all bands 40m through 10m, including the WARC bands. You will need the Elecraft BL-2 switchable balun (4:1 or 1:1 ratios) to allow your rig to get the best match. On some bands, the 4:1 ratio will allow the KAT100 to match most easily. On others, the 1:1 ratio will work better. Experiment until you know which settings go with which bands in your setup. If you have trouble matching on any particular band, adding a little extra feedline will change the impedance enough that the KAT100 will handle it. I use a set of dual banana plugs, not sure what you call them on your side of the pond. This lets me quickly add in a short extension feedline. Actually, if this extra length still allows the KAT100 to match ok on the other bands, just splice it in and leave it as a permanent part of the feedline. Good luck and 73 Bob N6WG ----- Original Message ----- From: "barry" <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Wednesday, April 18, 2007 7:54 AM Subject: [Elecraft] KAT100 tuning ability for bad antenna match > I live in an upstairs flat (apartment in us!), and have a small loft > space about 23ft long at the ridge and about the same across. > > Would a KAT100 tuner be able to tune a random length dipole strung along > the ridge? > > If not can you suggest an alternative antenna that would, I am seriously > limited in my options for aerials as you can see. > > Any advice most welcome ... Barry G0MPA > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
