<p dir="ltr">Howard<br>
Resonancs and minimum SWR are, as you said, NOT the same. Also your comment on match boxes is CORRECT. <br>
The best way to tune an antenna SYSTEM is to use an old fashioned field strength meter. It measures the field strength as it is radiated.<br>
Meter should be OUTSIDE the "Near Field" effecr <br>
(I think > 3 wavelengths).<br>
Practical distance is far away as u can see it, or have smme on "give" you the readinga. <br>
SUPER for tuning mobile antennas.<br>
Used 2 buy 2 mtr mobile antennas, replace antenna part with a piece of welding rod. <br>
Keyed on 123.5 mhz, read meter, trimmed 1 inch, keyed, read meter - continue until field strength no longer increases. <br>
Del W6KOZ<br><br></p>
</br></br><div class="device_aol_et_org_dt_dd_quote"></div><hr style="border:0;height:1px;color:#999;background-color:#999;width:100%;margin:0 0 9px 0;padding:0;"></hr><span style="font-size:14px; color:#999999;">On Wednesday, February 3, 2021 Howard, KB6NN via Harc <<span style="color:#0000A0">harc@humboldt-arc.org</span>> wrote:</span><br></br><div dir='ltr'>I have been trying to put into words why a dipole, resonant on a frequency we want to operate on may not show a 1:1 SWR. From experience I know that such an antenna does not always show a low SWR, and that the placement of the antenna is important (height above ground, nearby objects, etc.) in determining the SWR of an otherwise resonant antenna.<br></div><div dir='ltr'><br></div><div dir='ltr'>Also important is the method of feeding the antenna and connecting it to the radio. I also have been saying that SWR, when measured at the transceiver, is an indication of the match between the radio and the antenna system, not [just] the antenna itself - the antenna system includes anything from the antenna jack on the back of the radio all the way up to and including the antenna itself.<br></div><div dir='ltr'><br></div><div dir='ltr'>Another thing I say is that the matchboxes commonly called "antenna tuners" are matchboxes, not antenna tuners. They are impedance matching devices. If the radio wants a 50 ohm load, the matchbox makes sure that, whatever the actual impedance of the load (antenna system), a match to 50 ohms is obtained.<br></div><div dir='ltr'><br></div><div dir='ltr'>I found an article that says it better than I can, and has examples: <a href="https://hamradioschool.com/good-swr-and-antenna-resonance/" target=_blank>https://hamradioschool.com/good-swr-and-antenna-resonance/</a><br></div><div dir='ltr'><br></div><div dir='ltr'>Thanks for reading,<br></div><div dir='ltr'>Howard<br></div><div dir='ltr'>-- <br></div><div dir='ltr'>KB6NN<br></div><div dir='ltr'><br></div><div dir='ltr'>-- <br></div><div dir='ltr'>This email has been checked for viruses by Avast antivirus software.<br></div><div dir='ltr'><a href="https://www.avast.com/antivirus" target=_blank>https://www.avast.com/antivirus</a><br></div><div dir='ltr'><br></div><div dir='ltr'><br></div><div dir='ltr'>-- <br></div><div dir='ltr'>Harc mailing list<br></div><div dir='ltr'><a ymailto="mailto:Harc@humboldt-arc.org" href="mailto:Harc@humboldt-arc.org">Harc@humboldt-arc.org</a><br></div><div dir='ltr'><a href="http://mail.humboldt-arc.org/mailman/listinfo/harc_humboldt-arc.org" target=_blank>http://mail.humboldt-arc.org/mailman/listinfo/harc_humboldt-arc.org</a><br></div>