How to make a high Q (=quality factor) antenna coil for Shortwave 2 MHz-10 MHz demo

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Added 4 years ago by tomm

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How to make a high Quality factor (“Q”) Shortwave antenna coil for the range 2-10 MHz. Every necessary info is in the video.

The ideal tuning capacitor bridging this coil is 150 pF.

The ideal capacitor (to the top of the coil) when you use a long wire (!) antenna (say 10 meters outside) outside is 14 pF. You can make a tap on the lower part of the coil and connect the long wire antenna with a 14 oF capacitor to that tap for more selectivity (that not always works, by the way).

Much more info in the video.

On 5.52 I talk about bridging that coil with variable capacitors higher than 150 pF. That is far from ideal. The Q will drop, for lower frequencies (lower than 2 Mhz) it is better to make another type of antenna coil. Many video’s about that are on my YT Channel.

All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is

https://youtu.be/xbgQ8T3oqh4

In thematic order you can find these video’s under the “comments” section.

Important: to find all the links to the (+/-700) video’s on my YT Channel, select, in the comments section, “NEWEST FIRST”

My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.

https://www.lulu.com/shop/search.ep?keyWords=ko+tilman&type=

There is an important video via which you can buy a document where I give links to many of my video’s, published between 2010 and 2018.

Link is: https://youtu.be/XXRsA24NUE0

My books are also available via Barnes and Noble and via Amazon.

Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics with real properties for a purpose) and important adaptations to the circuits.

Be aware of that, I saw on the internet my circuits reproduced in a poor or not proper way.

I also found that people probably republish my circuits under phantasy names and/or with phantasy properties, not knowing electronics. Sometimes they want to find gold with them. I take distance from all these fake claims; I cannot help that it happens, sorry. Upload 11 oktober 2019.