> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:amradio- > [EMAIL PROTECTED] On Behalf Of Donald Chester > Sent: Friday, April 21, 2006 7:56 PM > To: [email protected] > Subject: Re: [AMRadio] antenna tuners > > > > > I don't believe in them. > > > > > > If you can't resonate your antenna, then what are you doing? > > > I prefer to use just one dipole, centre-fed with open wire line, and use > multiband tuners to operate that same antenna on several bands. That way > it > is uniformly efficient all the way across each band, and I don't have the > clutter of multiple dipoles strung all around each other, or the > compromise > of an "all-band" antenna such as a trap dipole. > > With a proper tuner, the antenna, feedline and ATU all make up a resonant > system. Resonance can be changed by changing the length of the antenna, > the > length of the feedline, or the adjustment of the tuner, but it's the whole > system that is placed in resonance, not just the antenna wire itself, as > in > the case of a simple coax-fed dipole. > > Don k4kyv
Hi Don, Let's say you changed the output impedance of your transmitter from 50 ohms to say 200 ohms. (changing nothing on the tuner) Would the "antenna system" (antenna, feed line and tuner) still be "resonant" as you had them tuned when you had the transmitter set for 50 ohms output? If you now retune the antenna tuner to accommodate the 200 ohm output of the transmitter, will the "antenna system" again be resonant? :>) :>) 73 Gary K4FMX
