> As to charring -- that's an issue if the device in question is seeing a > lot of dissipation. Properly designed and applied, chokes should NOT > see a lot of dissipation unless they are being used in series/parallel > combinations to do impedance transformation. > > 73, Jim Brown K9YC
OR, if the choking need location NECESSARILY has a lot of voltage to block, and then perhaps a bifilar-isolation transformer wound on a low-mu powdered iron toroid (#2 ideally) would be better. I have had applications where use of a high mu toroid was blocking so much voltage (necessarily so) that it just cracked and burned up the toroid. A careful re-examination of the model, with added long runs of balanced feed lines LITERALLY entered as wires uncovered the voltage, which in one case put close to thirteen hundred volts RF across a MEASURED 4k ohms RESISTIVE choke. One can easily figure out the burned toast factor there. Pop goes the toroid. And lossy, lossy, lossy. Really need to know the magnitude of what you are blocking. 73, Guy _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
