Doorknob Capacitor 20/40m Trap Antenna

My experimental coax-based 20/40m trap vertical antenna has finally bitten the dust. Now it's time to replace it with a proper discrete capacitor-inductor trap. So in this episode I touch on the subject of putting the trap together, show how I put it together, and we do a quick test on the RigExpert. Some other issues are uncovered, that will no doubt make it into the next episode, so come on back!

[@WECB640]

BRAVO! Excellent use of a trap. Looking forward to the next in the series. 73

[@AmRadPodcast]

Looking forward to getting this sorted out. Thanks for following along!

[@RL-521]

Hi Derrick! Can you do a video explaining the purpose of doorknob capacitors in amplifiers?

[@setSCEtoAUX]

I love your BTTF-style Plutonium case. :)

[@AmRadPodcast]

Hey Jim! Thanks man.

[@FEPLabsRadio]

I gotta get out and fix my 20m wire, i think it's stretched. i need to re-do radials as well. I'm afraid to go back there, like yours, i got wildlife probably gonna eat me.
Very cool, Derek.

[@AmRadPodcast]

Hey good luck out there. We got bears, alligators, bobcats, wild boars… it’s like a zoo in the back. Makes putting up antennas all the more fun.

[@Brighamdoc]

Thanks for taking the time to do this. Great vid

[@AmRadPodcast]

Thanks!

[@gregmihran8616]

Always admire your build skills - good job. Question - have u calculated the resulting loss from inserting a trap in ur vertical antenna? I've heard this is the downside to these types of antennas but I have no idea how significant it would be. I assume in this case, the losses would occur on 40M. What do u think? 😀 73 KJ6ER

[@R2AUK]

👍❤

[@RL-521]

Hi Derrick, and thanks for the video! Where do you suggest to purchase doorknob caps?

[@AmRadPodcast]

I've gotten several from the local surplus shop here in Orlando (Skycraft Surplus).. as well as eBay, usually from Ukraine.

[@luckydubeinrc5165]

missed the part for the actual wire length , but i am guessing 5.1m and 10.1m

[@TheSmokinApe]

Awesome job with the video 👍

[@AmRadPodcast]

Thanks Ape. Appreciate it!

[@suncrafterspielt9479]

👍

[@michanoymark2109]

Where is the video summarizing that the problem has been solved?

[@DarkoObretan]

Great job! What happened to your 'The Current Source' youtube channel? There were also many good videos...

[@Mr.Leeroy]

1:53
K15U-1 model
"M75" Temperature Coefficient of Capacitance group code (N080 International) = -75 ppm/°С
3.5kV 22pF+-10%
4 KVAR

[@AmRadPodcast]

Thanks!!!