Art, It may be as simple as bad diodes in the wattmeter portion D16 and D17. To easily check, set the power to 1 or 2 watts and measure the power output into a dummy with an external wattmeter. If the power output is 12 to 17 watts on the external wattmeter (much greater than 1 or 2 watts), then replacing diodes D16 and D17 will restore things to normal.
73, Don W3FPR Arthur Lewis wrote: > ----- Original Message ----- > From: Arthur Lewis > To: li...@subich.com > Sent: Wednesday, December 30, 2009 11:02 AM > Subject: KPA 100 > > > I have a KPA100 with a problem. I have two K2/100 and if I exchange the > KPA100s the rig works fine. Therefore the problem is not with the K2. The > problem KPA100 was built in 2000 and was a good working unit until recently. > Both of these units are top cover KPA100s. > > Problem: > It seems to draw Hi Cur as soon as I start bringing up the power level and > the output goes to something above 10 watts. After the relay clicks on the > KPA100 the output on an external watt meter goes above 100 watts and the SWR > on the external watt meter goes high. The power adjustment has little effect > and the rig is drawing about 22 amps. > > Again if I exchange the KPA100 with one that is working properly, everything > works normal. The rig draws about 13 amps at full power with the good KPA100 > and at the low end, before the relay clicks, has full adustment and low > current draw. The K2 seems to be working well on receive. > > Looking for seggestions. Is this self oscillation or perhaps a LPF problem? > > ______________________________________________________________ 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
