David Cutter wrote:
> Thanks for doing the sums, Jim, I was interested in the theory. I thought
> energy would be reflected in both cases of open and closed circuit stubs.
>
> Something new to learn every day.
>
> David
> G3UNA
>
>
> ----- Original Message -----
> From: James Colville
> To: David Cutter
> Cc: Jim Brown ; amps@contesting.com
> Sent: Saturday, April 03, 2010 5:48 PM
> Subject: Re: [Amps] coaxial stub on amplifier output
>
>
> Get your calculator out. 30dB down from 1500 watts is how much power?
>
>
> 1500 watts=+61.8 dBm minus 30 db (which is what the harmonic would be down
> normally) = +30dBm. +30dBm = 1 watt. Evenif the harmonic is only down 25
> db, that is only 3 watts.
>
>
> Not much power do dissipate is it?
>
> 73
> Jim W7RY
>
I don't know how you arrive at 1 W, but just by looking at it one should be
immediately possible to see it will be 1.5 W. No need for a calculator.
dave
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