[Elecraft] Has anyone epoxied their toroids after they werewound?

[Don Wilhelm]

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: 	elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]  On Behalf Of John, KI6WX
> Sent:	Friday, May 18, 2007 2:34 PM
> To:	J F; brian-wb6rqn at lloyd.com; 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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