Hmmmmm...... My K3S set to 100W says it is putting out 80W on 6M. An external power meter also reads ~80W. I did a gain calibration and there was no change. But, now you got me thinking. My 50-Ohm load is +30 years old and I doubt is rated for 50MHz.
_______________ 73, Jim - N4ST -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Bob McGraw K4TAX Sent: Tuesday, July 10, 2018 22:50 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3s Output on 6M Have you run a Transmitter Gain Calibration from the K3 Utility Application? If you do, be sure to use a good dummy load connected direct to the radio with a known good short coax jumper. The fact you have 3 different power indicating devices which all indicate different power values, I'd say you have a problem with your power measuring system, for starters. Always when measuring power it is wise to use a known good 50 ohm dummy load. And just because the label says 50 ohms is no sign it is really 50 ohms. Measure it with an ohm meter. Power meters are voltage sensing circuits and the R value affects the voltage. Thus, as examples, 100 watts into 45 ohms is 67.08 volts, 100 watts into 50 ohms is 70.71 volts, and 100 watts into 55 ohms is 74.16 volts. Even with a 1:1 SWR most antennas have some reactance and power indications will vary, depending on the complex Z. It is not reliable to measure power with a reactive load such as an antenna. Good luck. 73 Bob, K4TAX On 7/10/2018 9:18 PM, Gary Smith wrote: > Thanks Fred, > > Guess I have some issues with my K3s then. > I think it's past warranty at this point. > I'll break out the K3 and try to get it working in place of the K3s, > send the K3s back for repair and figure how to get WSJT going with the > K3 while 6 is still open. > > 73, > > Gary > KA1J > >> My K3S shows 100 watts, my Bird 43 with a 100 watt element shows 105 >> watts, my Daiwa CN-801HP shows 105 watts. All measurements are made >> into a known 50 ohm dummy load. >> >> 73 >> >> Bob, K4TAX >> >> >> On 7/10/2018 7:03 PM, Gary Smith wrote: >>> What is the expected output on 6 meters? >>> >>> The K3 shows 110W >>> The P3 watt meter says 73.1W >>> The LP-100A says 60.1W >>> >>> When I use the internal tuner it never breaks into the higher power >>> range, it only outputs at 7 watts tops. >>> >>> On all the lower bands it puts out 100 reliably. >>> >>> Thanks & 73, >>> >>> Gary >>> KA1J >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net Please help support this >>> email list: http://www.qsl.net/donate.html Message delivered to >>> rmcg...@blomand.net >>> >> >> > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > rmcg...@blomand.net > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to hamsh...@n4st.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
