I asked Zack Lau to answer the question about toroids

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From: Jim Kearman (jkearman@arrl.org)
Date: Mon Apr 26 1993 - 12:10:18 EDT


>From zl@zl Mon Apr 26 15:32:23 1993
Received: from zl by jek with SMTP
        id AA2406 ; Mon, 26 Apr 93 15:32:23 GMT
Date: Mon, 26 Apr 93 00:20:16 GMT
Message-Id: <47380@zl>
From: zl@zl (Zack Lau)
To: jek@jek
Subject: Re: Can you help this sinner?

There have not been reports of iron powder toroids being damaged
by excessive heat, though they won't function properly if they get
too hot (but will if they get to cool back down). This also assumes
that they didn't break into little pieces.

I assume you are properly packaging this transmitter and grounding
the chassis. Unfortunately, this design may not be well behaved in the
presence of RF fields due to its use of high impedance/gain circuits.


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