No. That is wrong. Forward and reflected are aspects of the standing wave, not power delivered. —wunder, K6WRU
On Jan 12, 2015, at 8:53 PM, Vic Rosenthal <[email protected]> wrote: > What I want is just forward - reflected. Neglecting losses, this is what the > tx is 'delivering'. In real life somewhat less gets to the antenna. > > Vic K2VCO /4X6GP > >> On Jan 13, 2015, at 3:19 AM, Fred Jensen <[email protected]> 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 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. >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
