[Elecraft] Feature wanted for W2 wattmeter

David Woolley forums at david-woolley.me.uk
Tue Jan 13 03:45:31 EST 2015


As well as not all the reflected power being re-reflected, the forward 
power measured by the coupler is not the first time forward power, but 
the sum of all the re-reflected power, as well.

-- 
David Woolley
Owner K2 06123

On 13/01/15 01:19, Fred Jensen wrote:
> Well ... sort of.  Some of the reflected power heats up the ATU and/or
> PA depending on the match it sees [actually, some of the forward power
> does too, tuners have forward losses].  "Delivered Power" is somewhat

>
> On 1/12/2015 4:46 PM, Phil & Debbie Salas wrote:
>
>> Actually, "delivered power" is pretty much what you are measuring.
>> Remember that reflected power is re-reflected by the source and adds
>> back into the forward power.  So in your example, you are transmitting
>> 1200 watts, having 200 watts reflected, then the 200 watts is
>> re-reflected by the source giving you the 1200 watts.  Of course, there
>> will be transmission line SWR-related losses.
>
>



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