> As the prior poster has suggested, the RF board path from from P1 pin 2 > to U7 pin 4 is suspect...
Not really. That's the band 1 path, for which satisfactory performance was reported. > ...as is the path between P1 pin 1 ans U7 pin 5. Which, assuming the fault does not stem from the same unlikely pathology on both filter boards, still seems most probable (although P1 is on the KFL1-2, so J6 on the RF board is more accurate). You could substitute the KFL1-4 from your other K1 to see if this or related problems show up. The four-band board couples the pre-mixer tuning circuit differently than does the two-band board, using U7 output from *both* pin 4 and 5 together on all four bands. A problem with the U7 pin 5 path on the K1 could show up on all four bands rather than just band 2. I would not worry about the K1 zapping the KFL1-4. The MCU is the only chip and it is obviously working on all your KFLs. Mike / KK5F I would not worry about anything coming from the K1 zapping anything on a filter board. The filter board ______________________________________________________________ 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
