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Paul
61 material ferrite will give higher Q than -2 powdered iron at LF/MF. Nothing wrong with -2 powdered iron ... it's just 61 material ferrite offers superb Q. I wouldn't recommend any of the lower frequency powdered iron materials if you're looking for high Q.
Jay W1VD WD2XNS WE2XGR/2
----- Original Message -----
Sent: 10/26/2017 11:26:58 AM
Subject: Re: LF: Monitoring 2190m WSPR
Thanks Jay.
I am far from knowledgeable about these materials but that agrees
with measured performance of several receive bandpass filters I
built for LF/MF last winter. I tried several different ferrite
materials and 61 performed best. However I have no idea how that
would compare to the powdered iron T50-2 normally used in this
circuit. In the long run I think I may order a couple more LPF kits
and build one both ways for comparison. Who knows, I may learn
something!
73,
Paul N1BUG WI2XTC
On 10/26/2017 10:46 AM, [email protected] wrote:
> Paul
>
> 61 material has the best Q of any of the ferrite materials (that I'm aware of) at LF/MF. Can't say
> whether or not the change to a different coil would be appropriate in that circuit.
>
> Jay W1VD WD2XNS WE2XGR/2
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