[Elecraft] OT: Protecting Toroidal Cores

[Dave Cole (NK7Z)]

Any choke I construct is in a box, with a 1/64th inch vent hole to keep 
from building a water pump out of my coax.

73s and thanks,
Dave
NK7Z
https://www.nk7z.net

On 05/02/2018 08:12 AM, N2TK, Tony wrote:
> 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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