SWR and Power Output

[Eugene]

The reason SWR should be of concern is the effect it has on what is presented to the solid state output device(s) in your radio.
The output power and final stage current is determined by the load presented by the antenna/tuner and the output matching network.
The output power is, P= supply voltage squared divided by 2xR(load). A 2:1 SWR could present a load either half or twice the design load for the 1:1 (50 ohm) SWR match or some where in between those two points with a complex impedance being presented to the output device(s).
Thus, the output power delivered by your radio and the final output device current and efficiency  is directly related to the "match" presented to your radio by your antenna and/or tuner.

Gene, N5LDX

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[W2xj]

I think that this was covered. You don’t run a solid state unit into a mismatch. The antenna tuner in effect takes the place of the output network that existed with tube rigs.

Sent from my iPhone

> On Apr 10, 2019, at 11:39, Eugene <[hidden email]> wrote:
>
> The reason SWR should be of concern is the effect it has on what is presented to the solid state output device(s) in your radio.
> The output power and final stage current is determined by the load presented by the antenna/tuner and the output matching network.
> The output power is, P= supply voltage squared divided by 2xR(load). A 2:1 SWR could present a load either half or twice the design load for the 1:1 (50 ohm) SWR match or some where in between those two points with a complex impedance being presented to the output device(s).
> Thus, the output power delivered by your radio and the final output device current and efficiency  is directly related to the "match" presented to your radio by your antenna and/or tuner.
>
> Gene, N5LDX
>
> Sent from my iPad
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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