I'd like to follow up on K2AV's excellent recent post. Thanks to K9AY's previous work, I also was turned on to the type 31 material for RF suppression at HF. I have found it to be substantially better than type 43, especially on the lower bands and for broadband use.
A hint for those of you who are contemplating placing an order for some of the clamp-ons: The smaller diameter clamp-ons look attractive at first glance due to their low prices and ability to fit most of the small cables in your shack. But remember the choking impedance goes with the square of the number of turns. A more expensive core with a larger aperture will be a much better bang-for-the-buck. For example, a core that allows 3 turns of a given cable will be 9 times more effective than a single turn core and might only cost only 50% more. Needing to use several single turn cores adds up quickly cost-wise. I use lots of the 0431164181 clamp-ons here. They will accommodate one pass of RG-8 size coax or several turns of computer cables, audio cables, etc. For example, it will allow 6 or 7 turns of RG-174. 73 Craig AC0DS ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
