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"Jeff" wrote: Im confused regarding the choice of iron powder toroid for a 7Mhz high pass filter. I need to use a small size (T68) toroid. For the freq range, some reference texts say T68-2 is the one, others say T68-6" grade. I see differing "best Q range" specs for the 6 grade.....2-30Mhz......10-50Mhz...etc. Have similar need for 20Mhz LPF, but assume "6" is really the choice there. Any suggestions as to the relative differences and reasons to choose between grades 2 and 6 for the HPF in T68 size? Either grade 2 or 6 should work fine at 7 and 14 MHz. The Al values differ somewhat, so the number of turns to get a given inductance will be a little higher for grade 6 than grade 2. You only need to confirm that the number of turns required will actually fit on your T68-size core. For a given number of turns, the unloaded Q does peak at one frequency but is still quite good on either side of that frequency. Unless you have some real need to achieve the highest possible Q for a given inductance at the frequency of interest, I wouldn't worry too much about it. Wind the toroids, build the filter, and see how it works out! -- Joe |
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