[Amps] AMP RATING FOR HEC CERAMIC CAPS

[rlm]

On Monday, October 13, 2003, at 02:56  PM, PAUL HEWITT wrote:

> Hi Norman
> You didn't spec a frequency.  This may get you close,
> http://www.rfparts.com/caps.html#doorknob  Or e-mail HEC at the link 
> on this
> page http://www.highenergycorp.com/ceramic/rftransmit.html  I don't 
> see the
> ht-50's listed anymore.  Probably not a good choice below 5mhz at legal
> limit, not a very good temp-co number available either.

•  Good point.  In my experiences, doorknob caps of up to 200pF are 
usually temp-stable, and those above 200pF are not.  In commercial 
amplifiers, for tank padders, one sees banks of c. 100pF units mounted 
between parallel Al plates.  Need a 1600pF Load padder for 160m?
A  4 by 4 square of 100pF units will do the job.  However - for 
coupling and RF bypass applications the unstable type works well.


> 73, Paul
>
> PAUL HEWITT
> WD7S PRODUCTIONS
> QRO HOMEBREW COMPONENTS
> http://wd7s.home.att.net
>
>
>> -----Original Message-----
>> From: amps-bounces at contesting.com 
>> [mailto:amps-bounces at contesting.com]On
>> Behalf Of Norman Hockler
>> Sent: Sunday, October 12, 2003 12:02 PM
>> To: amps at contesting.com
>> Subject: [Amps] AMP RATING FOR HEC CERAMIC CAPS
>>
>>
>>
>> Hello Amp builders
>>
>> Looking for the amp rating for HEC HT50  700pf @ 7.5kv.
>> Want to run 2 in parallel for blocking C on single 8877.
>> Cant find data on the Internet.
>>
>> Thanks.
>>
>> Norman N8NH
>>
>>
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/