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To compare differences by manufacturer consider Palomar's type 43 material is good for attenuation from 2 MHz to 1000 MHz. Fair-Rite's type 43 is good for attenuation from 20 MHz to 300 MHz. As you can see this is significant on the HF band. To compare differences by manufacturer consider Palomar's type 43 material is good for attenuation from 2 MHz to 1000 MHz. Fair-Rite's type 43 is good for attenuation from 20 MHz to 300 MHz. As you can see this is significant on the HF band. Fair-Rite 31 material - the best grade for general purpose HF and low-band chokes. Fair-Rite 31 clamp-on core, Part No 0431177081. An HF ferrite choke will typically need 6-8 turns passing through the center hole. Regardless of the type of core, one pass will probably not be very effective. The same Fair-Rite 31 material is also available in a "FT240" 2.4-inch toroid formatFair-Rite Part No 2631803802. 10-12 turns of coax on a FT240-31 makes a nice low-bands choke or balun.