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Re: [RFI] Ferrite core and hot glue?

To: rfi@contesting.com
Subject: Re: [RFI] Ferrite core and hot glue?
From: Larry Benko <xxw0qe@comcast.net>
Date: Fri, 23 Aug 2019 07:52:27 -0600
List-post: <mailto:rfi@contesting.com>
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 8/23/2019 3:22 AM, Martin Kratoska 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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