[TowerTalk] SWR and voltage

[Paul Christensen]

Line V(Peak) = [sq. rt. (Pwr*system Z*SWR)]* 1.414

Paul, W9AC

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Gary
Schafer
Sent: Monday, September 26, 2016 1:35 PM
To: 'Richard Solomon' <dickw1ksz at gmail.com>; Towertalk at contesting.com
Subject: Re: [TowerTalk] SWR and voltage

No, there is no such thing as peak to peak except on the scope screen.

You want to use peak values to figure the protector voltage.

73
Gary  K4FMX

> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of 
> Richard Solomon
> Sent: Monday, September 26, 2016 10:50 AM
> To: Towertalk at contesting.com
> Subject: Re: [TowerTalk] SWR and voltage
> 
> Wouldn't Peak to Peak values be needed ?
> In which case the multiplier is ~2.8.
> 
> 73, Dick, W1KSZ
> 
> On Mon, Sep 26, 2016 at 8:42 AM, Steve Hunt <steve at karinya.net> wrote:
> 
> > Steve,
> >
> > Those were rms figures of course; if you need peak values, multiply 
> > by
> > 1.414
> >
> > Steve G3TXQ
> >
> >
> >
> > On 26/09/2016 16:38, Steve Hunt wrote:
> >
> >> Steve,
> >>
> >> Firstly your figures are out for the 50 Ohm system; the figures are 
> >> 273.9V and 5.5A
> >>
> >> Once the SWR is no longer 1:1, there is an infinite range of
> impedances
> >> for any particular SWR, and therefore an infinite range of voltages
> and
> >> currents for a dissipation of 1500W. However, here are the upper 
> >> and
> lower
> >> limits:
> >>
> >> 2:1 SWR: 387.3V / 3.9A thru 193.6V / 7.7A
> >>
> >> 3:1 SWR: 474.3V / 3.2A thru 158.1V / 9.5A
> >>
> >> Steve G3TXQ
> >>
> >>
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> >
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> 
> 
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