[Amps] Mica cap substitute \ alternative

[R L Measures]

On Jul 12, 2006, at 2:17 PM, Gary Smith wrote:

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

This is on topic, Gary:  ABS, G-10, G-11, TFE, PTFE.

> 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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>
>

R L MEASURES, AG6K. 805-386-3734
r at somis.org