On 6/30/2012 3:34 PM, ZR wrote: > Evaluate against what? While Ive heard of Steward in the past I see nothing > on Lairds site that gives me any information to base an evaluation on.
I've had samples and a catalog from Stewart for years, but there's not nearly enough data there on which to base a judgment. Like Carl and Tom, I see no value in "much cheaper" for a product which there is only skeleton data, and characterizing these parts takes a LOT of time. Every Fair-Rite suppression part has a detailed data sheet with graphs of impedance vs frequency, and most of them for 1-3 turns. Fair-Rite publishes graphs of u' and u'' vs frequency for every material. I see nothing comparable in the Stewart book, nor in the Laird pdf referenced, and it is those data that tell a designer what they are and how they behave. Jack Smith may have learned enough about the part's he using to find them a good option, or he may be using them in a relatively undemanding application, or in application where the skeleton data is enough. 73, Jim K9YC _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK