Don, I have one question. This is the second time my K2/100 has completely toasted D16 and D17. I also have a KAT100 connected at the same time, which has virtually identical SWR bridge.
How is it that a static discharge can destroy D16 and D17, but the diodes D1 and D2 in the KAT100 are unaffected? With the K2/100 / KAT100 combo, at which time are each of the SWR bridges used? > On May 24, 2019, at 10:09 PM, Bill Coleman <aa...@arrl.net> wrote: > > OK, I removed D16 and D17, and on the diode setting of my DVM, they both > measured the same value both forward and backward - 034. Which means they > were totally shorted. > > I replaced them with new diodes (which measured 316 forward, and infinite > backward), and the RF display is once again working. > > Unfortunately, I don’t have a dummy load to do the calibration on page 48 > right now, so it will probably have to wait a few more days before I can > everything in the same place. > > However, I’m declaring this mystery solved. I am very glad I put machined > socket pins in for D16 & D17. Took only a couple of minutes to replace them. > >> On May 15, 2019, at 7:30 PM, Bill Coleman <aa...@arrl.net> wrote: >> >> Took me over week to check this, but power is the same whether Tune or >> Tune/Display — 100 watts! >> >> So, the suspects are likely D16 & D17. >> >> Fortunately, the last time I replaced them I put in a couple of pins from a >> machined pin socket, so it should be an easy job. >> >> I’ve had to replace U6 before as well. I think I have a socket there, too. >> >>> On May 4, 2019, at 12:11 AM, Don Wilhelm <donw...@embarqmail.com> wrote: >>> >>> Bill, >>> >>> Set the power at 50 watts and do a TUNE. >>> Is the output power at 20 to 25 watts? If so, so far so good. >>> Now try a TUNE/DISPLAY (hold both buttons at once). Is the power near 50 >>> watts? If so, you have proper power control and the problem is with the >>> LED display. >>> >>> OTOH, if the actual power in both cases above goes to 100 watts or more, >>> then the first step is to replace KPA100 D16 and D17. If that does not fix >>> things, there is likely another problem in the KPA100 wattmeter, likely >>> KPA100 U6 - but get back with the information before replacing it, there >>> are more tests to verify or deny that possibility. >>> >>> 73, >>> Don W3FPR >>> >>> On 5/3/2019 10:25 PM, Bill Coleman wrote: >>>> I’ve recently seem a problem with my K2/100. It transmits ok, and the >>>> power level out tracks the power control, but the power indication LEDs >>>> remain at zero. >>>> No, I’m not in ALC mode, I’m definitely in RF mode for the meter. >>>> I’m using an external wattmeter (a Kenwood AT-250 in passthrough mode), >>>> and can definitely see 100 watts being transmitted. >>>> I’m thinking that maybe D16 and D17 may have been fried. Is that a good >>>> guess? >> >> Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net >> Web: http://boringhamradiopart.blogspot.com >> Quote: "Not within a thousand years will man ever fly!" >> -- Wilbur Wright, 1901 >> >> ______________________________________________________________ >> 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 > > Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net > Web: http://boringhamradiopart.blogspot.com > Quote: "Not within a thousand years will man ever fly!" > -- Wilbur Wright, 1901 > Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ 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
