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Jeff wrote: Hi, 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? Having just been playing with Micrometals cores myself, I gather that -2 is indeed the 'best' for higher frequencies. The local distributor says it's stocked in greater depth too. Have you also looked at Magnetics Inc and Arnold ? Graham |
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