At 13.8 volts, 11amps is about 152 watts input. 100/152 = .658 * 100 for about 66% efficiency.
All in all , looks about right to me. AKA - I wouldn't be concerned. Bob, K4TAX Sent from my iPhone > On Nov 9, 2018, at 10:46 AM, Jim KO5V <[email protected]> wrote: > > Well, after checking that all of the components in the fan circuit were > correct, I decided to follow Don's usual advice about checking my soldering, > so I re-flowed all of their joints. None looked bad, but now the fan works as > it should, so... > > I'm still curious about my 11A @ 100W measurement. I think I'll borrow a > friend's DMM and see if I get the same voltage measurement across R1 > (unless 11A is in the ballpark). > > 73, Jim KO5V > > -----Forwarded Message----- >> From: Jim KO5V <[email protected]> >> Sent: Nov 8, 2018 2:11 PM >> To: Elecraft List <[email protected]> >> Subject: K2: KPA100 fan issue + current question >> >> I just finished building and testing the KPA100 that goes with K2 #7225. >> This kit was a rev C, and I have brought it up to the latest specs. U1 says >> PA 1.1. >> >> #1: It has passed all of the tests, except it apparently has no low fan >> speed. I have set the temperature of the heat sink using CAL tPA, after >> measuring it with an IR thermometer, and I have set and re-set the fan >> parameters in the secondary menu. On "nor" and on "LoHi" the fan is off. On >> "Hi" it runs. I have tested the amp's output into my power meter at 100w, >> but I haven't transmitted long enough to really heat anything up. >> >> When I first applied power to the KPA100 for the initial tests, I believe >> the fan ran at low speed, so I have probably broken something... >> >> #2: When I key the amp at 100w, through the power meter, and into a dummy >> load, I measure about .055v across R7, so that's ~11A. I expected higher >> current. Does that seem about right? >> >> Any insight would be appreciated. >> >> Thanks in advance, & 73, >> >> Jim KO5V > ______________________________________________________________ > 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]
