Don... The power supply is an MFJ 13.8V/25A switching power supply. It measures 13.63V at the terminals.
The K2 shows 13.1V in receive mode. During transmit on all bands, the K2 shows 11.3-11.9V, depending on the band. All the power connections appear to be tight. Thanks, Mike NJ2OM > On Jun 29, 2020, at 12:45 PM, Don Wilhelm <[email protected]> wrote: > > Mike, > > It is not reasonable to expect a normal wattmeter to have greater than a 10% > accuracy. > Consider that the spec for a Bird wattmeter is only 5% right after > calibration. > Digital wattmeters can be much more accurate, such as the LP-100 from > Telepostinc, but they are calibrated to NIST traceable standards. > > 73, > Don W3FPR > >> On 6/29/2020 8:50 AM, Mike Kopacki wrote: >> Okay. I will go back to your first reply and run through the items you >> suggested. >> >> Does the fact that on 40 and 80 meters, when I set the requested power to >> 100w, I actually see a little more - like 103w - but the power drops off on >> other bands - is that a clue to anything? >> >> Thanks, >> Mike NJ2OM >> >>>> On Jun 28, 2020, at 10:50 PM, Don Wilhelm <[email protected]> wrote: >>> >>> Mike, >>> >>> No, the KPA100 wattmeter will display the actual power being produced if it >>> is well calibrated. >>> That is not necessarily the same as the requested power, although with a >>> properly working KPA100 and a calibrated KPA100 wattmeter, the reading >>> should be the same. >>> >>> 73, >>> Don W3FPR >>> >>>> On 6/28/2020 9:41 PM, Mike Kopacki wrote: >>>> I can run through some of the items you suggest. But I don’t have an >>>> external wattmeter that can measure 100 watts. I do have a QRP wattmeter. >>>> >>>> I will start tomorrow to try and work through the question. >>>> >>>> But to be completely accurate...you are saying that the KPA100 wattmeter >>>> (which is what I see when pressing TUNE and DISPLAY together), should read >>>> the same as the REQUESTED power (which is what the power knob sets)? >>>> >>>> Thanks, >>>> Mike NJ2OM >>>> >>>>>> On Jun 28, 2020, at 8:58 PM, Eric Norris <[email protected]> >>>>>> wrote: >>>>> >>>>> Congratulations, Mike! Please let us ALL know how it goes, as we of the >>>>> K2 clan learn something with every post. >>>>> >>>>> 73 Eric WD6DBM >>>>> >>>>>> On Sun, Jun 28, 2020, 2:12 PM Mike Kopacki <[email protected] >>>>>> <mailto:[email protected]>> wrote: >>>>> Well, that gives me something to do! I’ll let you know how it goes. >>>>> >>>>> Thanks, >>>>> Mike NJ2OM >>>>> >>>>> > On Jun 28, 2020, at 4:41 PM, Don Wilhelm >>>>> <[email protected] <mailto:[email protected]>> wrote: >>>>> > >>>>> > Mike, >>>>> > >>>>> > Congratulations on finishing the K2/100. >>>>> > >>>>> > On the power output variation, that is not normal. >>>>> > First check the voltage delivered to the K2 while in transmit. >>>>> > You should do that by tapping DISPLAY and scrolling to the >>>>> voltage display. Your power source should provide at least 13.8 >>>>> volts, but higher (up to 15 volts) is better. If the voltage >>>>> shown by the K2 display during transmit is less than 12.6, make >>>>> certain all power cable connections are tight. >>>>> > >>>>> > If the power supply voltage is not the problem, then remove the >>>>> KPA100 from the base K2 and realign the bandpass filters. >>>>> Connect a dummy load to the base K2 BNC ANT jack. After that, >>>>> check the maximum power from the base K2 - you should have at >>>>> least 10 watts on each band. Record the power for each band. >>>>> > >>>>> > Using a dummy load takes away any question about your >>>>> antennas. Always check into a dummy load - with an in-line >>>>> wattmeter if necessary. >>>>> > >>>>> > The other possibility is that you have a problem in the Low >>>>> Pass Filter in the KPA100. To check for that, re-install the >>>>> KPA100, but power the base K2 from the coaxial power jack (no >>>>> power to the KPA100 - connect the dummy load to the SO2339 jack >>>>> on the KPA100. >>>>> > Again check the maximum power on each band from the base K2. >>>>> It should be no more than 5% less than you found with the base K2 >>>>> only. >>>>> > If there is a substantial difference in power, then check the >>>>> KPA100 Low Pass Filter - particularly checking the number of >>>>> turns on the toroids. >>>>> > >>>>> > 73, >>>>> > Don W3FPR >>>>> > >>>>> > >>>>> >> On 6/28/2020 4:04 PM, NJMike wrote: >>>>> >> I did notice a variation on the power output on different bands: >>>>> >> 80m - 100w >>>>> >> 40m - 100w >>>>> >> 20m - 80w >>>>> >> 15m - 50w >>>>> >> 10m - 30w >>>>> >> SWR was never above 1.3-1. >>>>> >> Does that sound normal? >>>>> ______________________________________________________________ >>>>> Elecraft mailing list >>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>> Post: mailto:[email protected] >>>>> <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] >>>>> <mailto:[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]
