[TowerTalk] 3M™ External PIM Absorber 1000 | 3M United States

[Jim Lux]

I’ve used similar products at lower frequencies (<30 MHz) to good avail for knocking down RFI carried on power and data cables. It’s basically a ferrite/powdered metal in a elastomeric binder, or you can get it as an adhesive tape. So the mix of the ferrite is important - something like a 31 mix would be better than a mix tailored for higher frequencies.
I think the stuff I’ve used most recently came from Laird. 
It’s also used inside enclosures to suppress cavity modes, and on the outside of horns to suppress creeping waves on the outside of the horn.

There are “evaluation kits” available for around $50-100 that have a whole selection of different materials, typically in 6x6” sheets or strips of tape or whatever.
 


On Sat, 18 Nov 2023 20:52:17 +0000 (UTC), Gene Smar via TowerTalk <towertalk at contesting.com> wrote:

This link worked for me. Can't find application info for freqs below 700 MHz.
https://www.3m.com/3M/en_US/p/d/b5005318008/


73 de Gene Smar AD3F

Sent from my Radio Shack TRS-80 model 100 laptop
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