Re: [RFI] Ferrite core and hot glue?

[Joe <nss@mwt.net>]

Google says YUP you can buy it all over, and saw in the summaries where 
people were home brewing up some for toroids.
https://www.google.com/search?q=Q-Dope&source=lnms&sa=X&ved=0ahUKEwjH38PvmpnkAhXCY98KHXnsAYcQ_AUIuAkoAA&biw=1440&bih=762

Joe WB9SBD
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On 8/23/2019 9:27 AM, Leonard Halvorsen via RFI wrote:
> Us older guys remember something called Q-DOPE.
> We used it at the Lab to attach all kinds of stuff, not just on coils.
> Can you even GET that stuff anymore?
>
> Leo H.
> WA2AMW
>
>
> Martin,
>
> About the only way to damage a ferrite core is to heat it above the
> curie point or to crack it by dropping it or contacting it with a hard
> object.  61 material ferrite has a Curie temperature in excess of 300
> deg. C.  I have measured cores that were held to a PCB via nothing, hot
> glue, silicone, epoxy, and double sided tape and couldn't measure any
> difference.  However if you use so much adhesive that it get up on the
> turns the performance can change since there will be some increase in
> the winding capacitance.
>
> Larry, W0QE
>
> On Fri, Aug 23, 2019 at 5:29 AM Martin Kratoska <martin@ok1rr.com> wrote:
>
> > I need to fix a choke balun wound on a BN61-2402 binocular core to the
> > PC board. The hot glue has 200 degs C when applied. Can it destroy the
> > core?
> >
> > 73,
> > Martin, OK1RR
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