[TowerTalk] Toroid "Goop"

[Roger (K8RI)]

KB1H wrote:
> I have used the liquid grip you can buy at a NAPA Auto Parts store which is 
> used to make grips on tools. Just dip the torrid is and voila!
>   

This stuff is much better than Silastic RTV (TM). It's easier, neater, 
and gives a good conformal coating.  A low viscosity epoxy or resin such 
as Vinyl Ester Resin (Dow Derakane (sp?)) can also give a good conformal 
coating that is rugged.  You can add filler such as microspheres to add 
bulk to completely pot a system without adding much weight.
My own choice happens to be the Vinyl Ester Resin which has a lower 
viscosity than most epoxies and handles higher temps while being a 
reasonably good heat conductor.  However none of these is good enough to 
increase the heat dissipation. They all serve as insulation to some 
extent and that can vary widely.  Probably the worst would be the RTVs.

One thing to remember though is, all these coatings will increase the 
distributed capacitance substantially which may or may not be a problem 
depending on the use to which the toroid is put.

73

Roger (K8RI)
> Dick - KB1H
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> ----- Original Message ----- 
> From: "RICHARD SOLOMON" <w1ksz at q.com>
> To: "TowerTalk" <towertalk at contesting.com>
> Sent: Tuesday, January 13, 2009 2:48 PM
> Subject: [TowerTalk] Toroid "Goop"
>
>
>   
>> I wound about 15 turns of RG-142 on a toroid and need some way
>> to secure the winding. There is not enough room left in the ID to
>> wind tape so I thought some liquid "stuff" might do the job. Just
>> dip the toroid in and let it congeal !!
>>
>> Any recommendations ?
>>
>> 73, Dick, W1KSZ
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