Quarter-Wave Antennas Explained: The Missing Half of the Antenna

Comments · 38

• TE

  @TelecomTraining · 3 months ago · pinned

  Comment<br><br>📡 What surprised you most about quarter-wave antennas?<br><br>Was it:<br><br>✅ The missing-half concept?<br><br>✅ How the ground plane becomes part of the antenna?<br><br>✅ The current and voltage distribution?<br><br>✅ How vehicle bodies act as a ground plane?<br><br>I&apos;d love to hear what stood out to you most.

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• MA

  @mariofilippi3539 · 2 months ago

  An excellent presentation on counterpoise antennas. &nbsp;I have a 41&apos; ground-mounted vertical with 50+ radials buried in the ground that I use for amateur radio and shortwave listening. &nbsp;The low angle of radiation allows me to contact other amateurs around the world. &nbsp;Thank you.

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• DA

  @danielrgusa · 3 months ago

  Great content. Very informative and easy to understand. I like the cadence too. Gives my brain time to process.

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• BR

  @Brigantine2008 · 1 month ago

  Good video, thank you!🇺🇸

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• KH

  @khimroy3958 · 3 months ago

  thank you teacher! I learn alot from your youtube channel 👽👍📡🌕

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• MS

  @mscir · 3 months ago

  Very interesting. I hope you will consider doing a part 2 (if you aren&apos;t already) and discuss Elevated Radials (Installed above ground level) vs ground level radials, because that changes the optimum number of radials by a significant amount.

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• IC

  @Iceman-PSG · 2 months ago

  Great training. Thank you

• XJ

  @Xjneun · 1 month ago

  thanks for all your videos! <br><br>i use a /4 lambda for my pota rig on a 24&apos; telescopic tripod which is meant to be a light tripod but works phantasticly for my purpose and i can proof that when the radials are in the same plane as the horizont ie 90° to the radiating element i always get about 34-39ohms and when i slope them in a 45° to the ground it goes perfectly to almost 50 ohms, mostly i get about 49,4~49,5ohms at the feedpoint

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• JO

  @josemanuelperezrodriguez-hm8vw · 3 months ago

  ❤❤❤👍👍👍👍👍👍

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• CO

  @colinbowman3015 · 2 months ago

  I wonder if you can help me iam on the 11meter band can i put an a sirio 2016 11meter antenna on top of an 30 ft pole we an moxon 11meter antenna &nbsp;underneath and taking the radials of the 2016 11meter can i do that

• JI

  @jimmyjimmy1253 · 2 months ago (edited)

  which better? radial 90 degree or 45 degree?

• N9

  @N9XRradio · 2 months ago

  RF current doesn&apos;t create radiation. &nbsp;You have stated this elsewhere. &nbsp;The current through a dummy load is a very poor radiator. &nbsp;Even if the current is high, the radiation will be low. &nbsp;What creates radiation is the current through the Radiation Resistance. &nbsp;Maximizing radiation is maximizing the current through the radiation resistance. &nbsp;Antenna resonance is nothing more than canceling the reactance. &nbsp;This can be performed by changing the length of the radiator, or adding a reactive device at the feed point to cancel the reactance at the desired frequency. &nbsp;There are other ways. &nbsp;<br><br>Current doesn&apos;t have to be strongest at the feed point. &nbsp;OCFD&apos;s have a 4:1 impedance transformer to increase the voltage by 2 and reduce the current. &nbsp;The current on a OCFD will be maximum at the center of the antenna. &nbsp;Not at the feed point. &nbsp;<br><br>Current on a vertical travels along the vertical portion and the horizontal radials. &nbsp;These conductors act as inductors and radiation resistance. &nbsp;The current resonates with the capacitance that inductance inherent with the stretch of the conductor. &nbsp;The lumped values should be zero for resonance.