Re: [Amps] peak voltage rating for load cap

[Alek Petkovic <vk6apk@bigpond.com>]

Ha! You're right.

Sorry 'bout that.

I'm a quick reader. Not a good reader. :-)

73, Alek.
VK6APK

On 19/08/2017 10:52 PM, Vic Rosenthal wrote:
> All of you guys are forgetting that he said "PI-L", not PI!
>
> Vic 4X6GP
>
>    
> > On 19 Aug 2017, at 16:29, Peter Voelpel<dj7ww@t-online.de>  wrote:
> >
> > Let´s say the SWR is 3 then the load might be 150 ohms.
> > The peak voltage across the load capacitor will be 775V at 2KW.
> > That is sqrt3 higher then at SWR1.
> >
> > 73
> > Peter
> >
> >
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Joe Subich,
> > W4TV
> >
> > That will give you average (RMS) voltage with SWR = 1:1.  For peak
> > voltage, multiply by 1.414 (peak voltage of a sine wave):  316 * 1.414
> > = 447 V.
> >
> >      
> > > Your 1200V capacitor will do the job with adequate headroom., when
> > > your system is all tuned and matched.
> > >        
> > Multiply the peak voltage by the SWR for worst case peak voltage if
> > the voltage node occurs on the capacitor - 316 * 1.414 * 3 = 1340V.
> > A 1200 volt rated capacitor will be marginal in a *system* allowing
> > for a maximum SWR of 3:1 at 2 KW - it will be barely adequate when
> > the system is designed for 1500 W (1166 V).
> >
> >
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> >      
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