Free RF choke's ?

[Al n3izr]

Hello I got a box of old computer monitor cables the ones
with a choke on one end. Will this choke work well on
coax to knock down unwanted RF ? Or has anyone know
what range they work in?

73 Al / N3IZR

 

[Mudfoot]

It's hard to tell the mix. You'll likely just have to try them.

 

[Captain Kilowatt]

I am in the same boat. i have a whole bunch of unidentified toroids and ferrite chokes that I salvaged from old computers etc. Most of them came from old monitors and I suppose they may be wide band material but who knows. It;s a try and see approach.

 

[ghutch]

K0BG.COM has info on testing identifying torids using a mfj259.

 

[Captain Kilowatt]

Tried that method. Still a gamble at best I found.

 

[dc2rf]

These days you can look on ebay and buy a LCR tester without an enclosure pretty inexpensively. Then you can wind a few turns around the toroid and can use the tester to see exactly what range the toroid is good for.

 

[K4PIH]

Free RF Chokes

I don't see where they could hurt. I have a box full myself and I think I need to check them out.

 

[Yankee]

Not sure myself, but wouldn't these built in chokes be specifically for trapping HF RFI? What else around the house or office would they put them in there for? Fluorescent ballast maybe?

 

[Captain Kilowatt]

And probably 99% of the problems we have is when on HF, and we should only be so lucky if most of the ferrite material on electronic gear is suitable for that range, and the other 1% would be for power line filtering.