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## Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?

 To: "Discussion of Ten-Tec Equipment" Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range? "N4PY" N4PY , Discussion of Ten-Tec Equipment Sat, 8 Jan 2011 11:54:23 -0500 mailto:tentec@contesting.com>
 ```Impedance also has a reactance component. A 2:1 SWR could be a 25 ohm 0 reactance load or a 100 ohm zero reactance load as you state. But there are also an infinite number of values of real and reactive values that can give a 2:1 SWR. Impedance is R + jX where R is the real part of the impedance and X is the reactive part of the impedance. So it is not as simple as it sounds. Carl Moreschi N4PY 121 Little Bell Dr Hays, NC 28635 www.n4py.com ----- Original Message ----- From: "dbp tds.net" To: Sent: Saturday, January 08, 2011 11:37 AM Subject: [TenTec] TT Eagle tuner spec: SWR v. impedance range? > Hi- > > I do not believe that "there is no such thing as a stupid question. You be > the judge: > > The Eagle spec sheet for the antenna tuner says: "Matching impedance > range: > 10:1 SWR typical". > > Impedance is measured in Ohms, (Z). Impedance is not a ratio, its' > associated SWR is a ratio. I think this spec would make more initial sense > if it read from like "10 Ohms to 1500 Ohm's". That to me is an impedance > range. > > What does a 10:1 SWR actually mean? A 50 Ohm dummy load gives a 1:1 SWR; > and a 100 Ohm load gives a 2:1 SWR as does a 25 Ohms give a 2:1 SWR, 12.5 > Ohms is a 4:1 ratio. 200 Ohms is 4:1, 400 Ohms then gives an 8:1 SWR. That > is considering the designed output Impedance of the transmitter is 50 > Ohm's. (Back when a TX ouput was designed for 75 Ohm's then a 75 Ohm > antenna > yielded a 1:1 SWR). > > So, should I assume (hate that word) that the Eagle tuner "Matching > impedance range: 10:1 SWR typical" could mean a tuning Impedance range > from > 25 to 400 Ohm's? If that is the case, I want an external tuner that will > match maybe from 10 to 1500 Ohm's I*mpedance to use with the short whip > (LoZ) or end fed longwire (HiZ) antenna. Just thinking of easy antennas to > throw up in a portable situation.* > > *What say you?* > > *73 de dave in NH* > _______________________________________________ > TenTec mailing list > TenTec@contesting.com > http://lists.contesting.com/mailman/listinfo/tentec _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.contesting.com/mailman/listinfo/tentec ```
 Current Thread [TenTec] TT Eagle tuner spec: SWR v. impedance range?, dbp tds.net Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, N4PY <= Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, shristov Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, Dr. Gerald N. Johnson Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, Steve Hunt Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, Rick - NJ0IP / DJ0IP Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, Dr. Gerald N. Johnson Re: [TenTec] TT Eagle tuner spec: SWR v. impedance range?, Rick - NJ0IP / DJ0IP