[Amps] Mica cap substitute \ alternative

[Harold Mandel]

Steatite, (porcelain); Corning Glass, PTFE....

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Gary Smith
Sent: Wednesday, July 12, 2006 5:18 PM
To: R L Measures; g3rzp at g3rzp.wanadoo.co.uk
Cc: Amps Amps
Subject: Re: [Amps] Mica cap substitute \ alternative

At the risk of straying OT, what is a good insulator at 50 MHz or >?
73,
Gary...wa6fgi


----- Original Message ----- 
From: "R L Measures" <r at somis.org>
To: <g3rzp at g3rzp.wanadoo.co.uk>
Cc: "Amps Amps" <amps at contesting.com>
Sent: Wednesday, July 12, 2006 3:46 AM
Subject: Re: [Amps] Mica cap substitute \ alternative


> It's called Dissipation Factor.  For example, Nylon, Delrin and Vinyl  
> are excellent insulators at 50Hz, but at 50MHz they are not.
> 
> On Jul 12, 2006, at 2:13 AM, Peter Chadwick wrote:
> 
>> Rich said:
>>
>> >Unlike barium-titanate dielectric (ceramic)  doorknob capacitors,
>> whose current carrying ability increases from 5MHz to 30MHz, mica
>> dielectric caps' current carrying ability decreases above 5MHz.<
>>
>> Yes, but WHY? What's the mechanism that allows mica to be a  
>> perfectly good insulator in other application, way way up in  
>> frequency?
>>
>> 73
>>
>> Peter G3RZP
>>
>>
> 
> R L MEASURES, AG6K. 805-386-3734
> r at somis.org
> 
> 
> 
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