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@somis.org>
> To: <g3rzp@g3rzp.wanadoo.co.uk>
> Cc: "Amps Amps" <amps@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@somis.org
>> _______________________________________________
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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
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