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]
