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With all this chatter about resonance (some of which I know won't hold water) I will have to go and look again. I have been working with resonance as being when inductive reactance and capacitive reactance are equal. That may or may not occur at 50 ohms resistive. The "tuner" really is a "matcher" and if it is in your shack near your transmitter it is used to show your transmitter a match to the feedline - usually 50 ohms. The other end of the feedline at the antenna is randomly affected by the matcher at the opposite end (in your shack). It would be rare for the feedline and antenna to be well matched with parts thrown up out in the wild. It may work just fine anyway.
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To get a good match at the antenna to the feedline out there the "matcher" must be located at the antenna feedpoint. Now I will go look up resonance once again and see what it is. When I was a child and wanted to build a radio I was completely frustrated. I completely ignored resonance. Who needs that foolishness anyway. Finally I got a grasp on resonance and next I built a working radio:) I don't believe the definition has changed in 65 years. 73, Bill KU8H bark less - wag more On 9/7/20 2:34 PM, Torbj?rn Toreson wrote:
For the sake of making an instruction for an antenna tuner I placed a dipole of length about 2 times 8 meters in my garden about 1 meter up from the ground. The idea was to get some not ideal values that could be handled by an antenna tuner. I used my NanoVNA to get a Smith-diagram between 3 and 8 MHz according to the enclosed picture. Point 1 is 3 MHz and point 8 is 8 MHz. |
