Just FYI
Fair-Rite on YouTube on split-core ferrites having different
characteristics from solid core:
https://youtu.be/5QKMaPGJswU?si=aVBF0n1oFCaL66ij&t=217
On Tue, Dec 3, 2024 at 2:02 PM <amps-request@contesting.com> wrote:
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> 1. Re: Alpha 77dx L5 help (gudguyham@aol.com)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Tue, 3 Dec 2024 13:04:00 +0000 (UTC)
> From: "gudguyham@aol.com" <gudguyham@aol.com>
> To: <ka4inm@gmail.com>, <amps@contesting.com>
> Subject: Re: [Amps] Alpha 77dx L5 help
> Message-ID: <711138114.2946897.1733231040886@mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> If a virgin core is broken you can probably fix it as stated but if the
> core overheats the properties of the permeability often change and new
> cores are needed. ?The Command Technology HF2500 uses a similar toroid
> system and the cores are probably the same. ?Keep the burned one intact so
> you can count turns and where the taps go.?
>
>
> Sent from the all new AOL app for iOS
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>
> On Monday, December 2, 2024, 11:45 PM, Ron W4BIN <ka4inm@gmail.com> wrote:
>
> ? Mr. Greg K1YW wrote:
>
> > I have a friend in Thailand who recently zorched out L5 in his 77DX.
> > Believe it or not, a small lizard got into the tank circuit and when
> > he was tuning on 80 meters, L5 got extremely hot - to the point of
> > cracking both of the torroidal cores! Does anyone know what specific
> > cores were used or if not, what the approximate value of inductance
> > that L5 should be? I assume these are iron powder cores. I'm trying to
> > help him remotely or perhaps send him a replacement
>
> ? If they are broken in two (or more pieces) I have a friend that
> swears that after gluing broken
> powered iron cores back together they work just as good as new, after
> being epoxied back together,
> Clamp them together while the epoxy sets.? (a radiator hose band might do)
> --
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> End of Amps Digest, Vol 264, Issue 3
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