A variation on the idea proposed by Wayne is to add an inductor or capacitor in series with the center wire in the feeder. That will change the impedance presented to the tuner. You may need to experiment a bit to find a value that the ATU can match - as indicated by a low SWR - but you won't have to fiddle with a separate ground system. You whatever you have handy - a 20 to 50 pf cap or a dozen turns of hook-up wire around a 35 mm plastic film container. You aren't looking for any exact value, just enough reactance to move the impedance into a range the T1 can match.
Ron AC7AC -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of wayne burdick Sent: Tuesday, October 25, 2005 4:32 PM Cc: Elecraft Reflector; QRP-L; Kurt Loken Subject: [Elecraft] T1 tuner issue: try shorting the feedline,working against ground Kurt, The impedance of your 40 m dipole on 20 m is probably sky-high; 2.5:1 may be the best you can hope for. This probably won't hurt the rig, and the power loss due to the high SWR is probably less than a dB assuming the rig doesn't roll back power (or clip the voltage at the collector of its PA). Another thing you can try is to short the coax center connector to its shield. This is an old trick for extending the matching range of an antenna. Connect this to the T1's hot lead, then connect the T1's ground to a ground counterpoise. The impedance will likely be very different, giving the ATU a chance to match it. It will be slightly noisier than a dipole, and the directivity will change, but you may not mind. 73, Wayne N6KR --- 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 _______________________________________________ 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
