[Elecraft] Feature wanted for W2 wattmeter

[Fred Jensen]

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 
difficult to calculate.  Working into a matched, non-reactive load 
[common for AM broadcast, at least a number of years ago], it's "I 
squared R" where R is the radiation resistance of the antenna ... and 
some minor conductor losses in the antenna.  Things get pretty sticky if 
it's not a matched load.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

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.