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Junk ferrite cores


vbifyz
 

People keep upgrading their PC monitors, and a lot of monitor cables are being thrown away. First  VGA, and now DVI. Many of them have EMI suppression ferrite cores of various sizes.
They come essentially for free if you know where to look. I accumulated a dozen or so of these, planned to use them for common mode suppression chokes. The material is unknown, but seems to work well on HF frequencies.
Have anybody in this group tried to use these cores in a loopstick antenna? They can be glued together to form a "rod" of sorts.

73, Mike AF7KR


Steve Whitt
 

Hi Mike

 

If I recall correctly the ferrites used  for EMI suppression on data cables are designed to be lossy. In otherwords the RF energy travelling along the cable should turn to heat in the ferrite material.

 

If so then they would be no use in an aerial system.

 

73s

Steve

 

 

From: main@UltralightDX.groups.io [mailto:main@UltralightDX.groups.io] On Behalf Of vbifyz
Sent: 11 December 2019 16:25
To: main@UltralightDX.groups.io
Subject: [UltralightDX] Junk ferrite cores

 

People keep upgrading their PC monitors, and a lot of monitor cables are being thrown away. First  VGA, and now DVI. Many of them have EMI suppression ferrite cores of various sizes.
They come essentially for free if you know where to look. I accumulated a dozen or so of these, planned to use them for common mode suppression chokes. The material is unknown, but seems to work well on HF frequencies.
Have anybody in this group tried to use these cores in a loopstick antenna? They can be glued together to form a "rod" of sorts.

73, Mike AF7KR