Hi All I have an elderly K2 which had the original KNB2 installed, the one with the two trimming capacitors in the bandpass filter circuit. I ordered the revised board and this was built yesterday. The issue is that with the new board installed the sensitivity is very much reduced which is confirmed using the XG3 at 50uV output, with the original board the S-meter indicates S9 where as with the revised board the S-meter indicates S3. I have checked that all the components are in all the right places paying particular attention to the capacitor values, that all the inductors have the correct number of windings and that there is continuity between each end of the inductionr (0.04Ohm).
Is there anything I can further check? Test equipment available: XG3 50MHz Oscilloscope MFJ Antenna Analyser Fluke 77 multimeter with RF probe. As an added bonus today I was using the K2 at a special event where we had multiple stations running. One of the other stations came on my frequency and transmitted. The result (with the KPA100) installed is that I get a constant high current reading on the display and SWR of 9.9, I’m presuming that the diodes D16 and D17 in the KPA100 will have been fried (?) All recommendations greatly received. Regards Nidge (G0NIG) IO93dv ______________________________________________________________ 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
