Electronics > Projects, Designs, and Technical Stuff
Do I need shielded chokes for noise suppression
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T3sl4co1l:

--- Quote from: Simon on November 19, 2018, 07:00:19 pm ---
--- Quote from: T3sl4co1l on November 19, 2018, 06:33:03 pm ---A choke doesn't tell me anything about where you want to put it!

Tim

--- End quote ---

http://katalog.we-online.com/pbs/datasheet/7448680140.pdf

--- End quote ---

Yeah I saw that... what were you intending to do with it?

This datasheet says exactly zero about your application.

If you just throw it in wherever, it may well make things worse.  I have no idea!

Tim
Simon:
Well I am 10-15dB over the limit on 80-105MHz, we believe the noise to be common mode.
nctnico:

--- Quote from: Simon on November 19, 2018, 07:00:19 pm ---
--- Quote from: T3sl4co1l on November 19, 2018, 06:33:03 pm ---A choke doesn't tell me anything about where you want to put it!

Tim

--- End quote ---
http://katalog.we-online.com/pbs/datasheet/7448680140.pdf

--- End quote ---
This seems to be a mains choke. Due to the air gap it will have both common and differential mode suppression. But as Tim suggests you have to put it in the right place.
Simon:
oh so that graph has both characteristics at the same time. That helps as I also need some differential filtering as well.

I am supplying DC, and to the outside world anything but DC will be detectable.
coppercone2:
Are you measuring this noise with a 100MHz LISN or are you measuring it with the 30-somethinghz antenna in the room?

I never saw a LISN that went past 400MHz.
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