I remember getting MN8CX cores from W1WCR back in the day
73
Tim K3LR
-----Original Message-----
From: RFI [mailto:rfi-bounces+k3lr=k3lr.com@contesting.com] On Behalf Of
n0tt1@juno.com
Sent: Friday, June 14, 2024 8:46 PM
To: RFI@contesting.com
Subject: Re: [RFI] MN8CX cores availability?
The MN8CX core was "made popular" back in the day by ON4UN. I recall
some (what I jokingly call) "core war shootouts" on the Topband
reflector...people
doing some comparisons between type 73 binocs and the MN8CX cores for
Beverage antennas. Check out one of John's early Topband
books...probably
has info in there.
73,
Charlie, N0TT
On Fri, 14 Jun 2024 14:14:18 -0700 Jim Brown <jim@audiosystemsgroup.com>
writes:
> On 6/14/2024 1:45 PM, Richard (Rick) Karlquist wrote:
> > Google reveals this is a "Power Ferrite <1 MHz" made by National
> > Magnetics Group in PA. Never heard of them. It is a MnZn matl
> > with u-3100. Probably not relevant for RFI suppression.
>
> Agreed. MnZn will have dimensional resonances, which can be either
> very
> useful (like Fair-Rite #31), or seriously limiting (most other
> mixes).
> Lacking data comparable to what Fair-Rite provides for specific
> parts,
> it's a science project to figure that out. The limited data suggests
>
> power circuitry.
>
> 73, Jim K9YC
>
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