Technical Topics > The RF Workbench

BCB Bandstop filter Chinese vs homebrew

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syfr:
I built a broadcast band bandstop filter to put in front of my Kiwis, and the results are pretty cool, as measured by the NanoVNA.  I got about 55dB attenuation at the frequency of interest and minimal loss at the rest of HF.

Hope some may find it interesting/useful. NanoVNA is awesome


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syfr:



Less than half the rejection . This was a "DISTILL AM" filter seen on Ebay

syfr:
Schematic




Prototype

~SIGINT~:
Nice work on the filter. In a previous thread ( https://www.hfunderground.com/board/index.php/topic,80208.msg262629.html#msg262629 ) I evaluated the NooElec Flamingo AM and Flamingo FM filters. Both filters are well built and assembled and performed as advertised by the manufacturer. Below you will find the filter response charts based on the tests that I performed using my HP/Agilent instruments.

The NooElec products are manufactured in North America and can be purchased directly from their web site: https://www.nooelec.com/

stendec:

--- Quote from: syfr on June 03, 2021, 1651 UTC ---I built a broadcast band bandstop filter to put in front of my Kiwis, and the results are pretty cool, as measured by the NanoVNA.  I got about 55dB attenuation at the frequency of interest and minimal loss at the rest of HF.

Hope some may find it interesting/useful. NanoVNA is awesome


--- End quote ---

Syfr --

 Very nice work on the design and construction of your bandstop filter. 55dB attenuation is amazing!
 A couple of questions:

     - What software did you use to capture the nanoVNA data?
     - what core material was used for the toroids?

Thanks,
Stendec

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