Don, Yes, I set the bias as described, and at that setting, R6 is rotated about 1/3 clockwise from fully CCW (I saw a reference to that reference in the archives). My guess is that my 35 year-old Beckman meter may be having trouble measuring small voltages, so I'll try another meter, and I'll report what I find.
Thanks! 73, Jim KO5V -----Original Message----- >From: Don Wilhelm <[email protected]> >Sent: Nov 9, 2018 9:56 AM >To: Jim KO5V <[email protected]>, Elecraft List <[email protected]> >Subject: Re: [Elecraft] K2: KPA100 fan issue + current question > >Jim, > >I would expect that the current at 100 watts would be closer to 17 or 18 >amps. >Has the bias been set correctly for a 400mA rise in PA current with no >RF input? That bias setting will alter the operating class of the >amplifier and it must be correct to be linear. > >73, >Don W3FPR > >On 11/9/2018 11:46 AM, Jim KO5V 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). ______________________________________________________________ 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]
