Sujet : Re: Filter problem
De : bill.sloman (at) *nospam* ieee.org (Bill Sloman)
Groupes : sci.electronics.designDate : 12. Jun 2025, 12:50:09
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Organisation : A noiseless patient Spider
Message-ID : <102eetp$2ldr3$4@dont-email.me>
References : 1
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On 12/06/2025 7:06 pm, Liz Tuddenham wrote:
<snip>
I have some ferrite toroids that could be used to match the valve output
impedance to the filter characteristic impedance.
Do you know the nature of the ferrite in the toroids?
Manganese-zinc ferrites tend to be lossy at frequencies above a few hundred kHz. Nickel-zinc ferrites have a higher resistance but get lossy above a few MHz.
If there are specialised ferrites for the 150MHz range I've yet to hear of them.
-- Bill Sloman, Sydney
Filter problem
Re: Filter problem