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Technical Topics => Equipment => Topic started by: ByteBORG on February 19, 2014, 0240 UTC

Title: Ferrites, RF Chokes
Post by: ByteBORG on February 19, 2014, 0240 UTC

This may have been discussed before but EXACTLY where, and on what wires do I install them
when running a computer with an SDR ?

Oops, this may be the wrong category. Sorry...... :o

Title: Re: Ferrites, RF Chokes
Post by: ChrisSmolinski on February 19, 2014, 1421 UTC

This is what worked for me, YMMV: http://www.radiohobbyist.org/blog/?p=1374

Title: Re: Ferrites, RF Chokes
Post by: ByteBORG on February 19, 2014, 1519 UTC

Thanks for the link, Chris.  :)

Title: Re: Ferrites, RF Chokes
Post by: RCCI on February 20, 2014, 0313 UTC

My shack was filled with RFI devices with computer, TV set,  fluorescent overhead lights, etc. Ferrite cores were on cords and had a minimal positive effect. Real Frustration City. Constant S8-9 noise.

Came into a TRIPP-LITE Internet Office UPS  battery back up, surge protector, and FILTER, for $8 at a Salvation Army. Pluggd the radios in...and noise level dropped 3db. Noise signal about S5 now. What a difference.

My 2 sense worth :D

Title: Re: Ferrites, RF Chokes
Post by: rdla4 on February 20, 2014, 2158 UTC

I have the "snap" ferrites on everything coming out of the PC.... USB keyboard and mouse, DVI, usb to the SDRIQ, if its a cable coming out of the pc it has one! I try to keep mine close to the pc, and I wind as many turns of the cable as I can fit thru the opening. Power cables---choke those as well.

I also have them on coaxial cables as they enter the house.

My noise floor is quite low here, despite Two PCs in the room, and several RF generating devices in other parts of the house.

In my case, I could watch noise blobs fade out as I added these things.