[Elecraft] OT: Protecting Toroidal Cores

[N2TK, Tony]

I have had several FT-240 #31 cores crack with big chunks out of them or
break in pieces. They were just lying on the ground with several turns of
RG6 through them. They were in rain, snow and ice for a winter here in
upstate NY. These were for receiving. I will be building new chokes and put
them in a 4 x 4 plastic sealed box.
73,
N2TK, Tony

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Charlie T
Sent: Wednesday, May 02, 2018 7:36 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] OT: Protecting Toroidal Cores

Yeas, but it's a destructive test, like checking the opening current for a
fuse.
I would guess that any core, whether ferrite or powdered iron would be
subject to some water absorbs ion in not coated/painted.

73, Charlie k3ICH




-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of donovanf at starpower.net
Sent: Wednesday, May 02, 2018 12:56 AM
To: jim at audiosystemsgroup.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] OT: Protecting Toroidal Cores

I have not, but its easy to test! 

----- Original Message -----

From: "Jim Brown" <jim at audiosystemsgroup.com>
To: elecraft at mailman.qth.net
Sent: Wednesday, May 2, 2018 4:44:44 AM
Subject: Re: [Elecraft] OT: Protecting Toroidal Cores 

On 5/1/2018 9:30 PM, donovanf at starpower.net wrote: 
> Some mixes will absorb water then crack when frozen
> 
Hi Frank, 

Have you kept track of which mixes have that characteristic? 

73, Jim K9YC 

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