Re: K1 no power out B2
Posted by
Mike Morrow-3 on
Jun 10, 2012; 3:23am
URL: http://elecraft.85.s1.nabble.com/K1-no-power-out-B2-tp7557347p7557404.html
> 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
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