IF filter taken apart & how to "homebrew" a 455 KHz IF filter for a superhet.

The video shows how a 455 KHz electromagnetic IF filter works and how you can make such a filter yourself with cardboard forms, isolated copper wire from 0,2-0,3 cm, a ferrite rod and ceramic or other tuneable caps.
Some remarks/corrections to the video:
1) a serious cardboard form for the homebrew IF fliter on 455 KHz must be made. It must be able to slide the 2 IF coils up and down on the frerrite rod.
2. the homebrew IF filter must be tuned to 455 KHz by moving up and down the coils and at the same time bridge the coils with tuneable or fixed ceramic caps or other wise to tune it to 455 KHz. The key is: a sharp peak and good bandwidth (say 8 KHz wide for normal broadcast radio stations)
All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is
• Radiofun232 on RUclips...
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.
www.lulu.com/s...
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: • Radiofun232: Links to ...
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 RUclips. 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. Sometimes they want to find gold with them. I take distance from all these fake claims; I cannot help that it happens, sorry. Update 13 november 2019.