And to that I would add that is is not necessary.
As validation of that fact,
I built one K2 for a client that has been used mobile in an 18 wheel
truck for at least 2 years. Even with all that shaking and vibration
present in that environment, there were no problems or instabilities -
no fixatives were used at all except for the nylon washer that normally
is used to secure T5.
73,
Don W3FPR
peter gerba wrote:
Hi;
See the article below. Roy does some testing with various materials.
I don't seal anything unless it's going to be exposed to the weather.
Pete kn6bi
"Toroidal Inductor Measurements" by Roy Lewallen, W7EL December, 1998
http://www.qrp.pops.net/w7el.htm
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John, KI6WX
Sent: Friday, May 18, 2007 2:34 PM
To: J F; [EMAIL PROTECTED]; Elecraft Discussion List
Subject: Re: [Elecraft] Has anyone epoxied their toroids after they
werewound?
Applying any material (Q-dope, epoxy, hot glue) to the wound toroid is not a
good idea. It increases the interwinding capacitance and can effect the
performance of the various toroidal transformers. This is especially true
in the transmitter section where the toroids are tuned with a fixed
capacitor to increase the power transfer. The value of these capacitors was
determined without any coating material on the toroid, and changing the
dielectric around the toroid windings may require a change in the
capacitor's value.
-John
KI6WX
Never have epoxied toroids, I can see one major
disadvantage using this method... You'd never be able
to rewind the same core. Epoxy is a real bear to
remove.
I've used hot glue to keep toroids in place, a little
easier to remove if needed.
Think you're better off with nail polish or acrylic..
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