[Elecraft] [K2] K2 # 7841 is working

[aj4tf]

With some assistance from Don, W3FPR, K2 # 7841 assembly has been completed
successfully. 

I found that the J310 FETs that came with the kit were slightly too slow to
make the synthesizer operate. Apparently this is an issue with the latest
batch of J310s.  There's a couple of solutions for this:  (1) install a 10
pF cap between the source and ground of Q19 or (2) use a different J310.   I
tried both solutions, they both worked.  In the end I elected to source some
J310s from kitsandparts.com which were an older vintage, and it worked fine
without the extra capacitor.

I also found that the trimmer caps for the 10m/12m bandpass filter (C44,
C46) were very touchy;  I thought for a while that 12 meter TX was not
working, but I finally got them tuned up so that I had good output power on
12m.  

I built # 7006 about 9 years ago (which is still working well), and was
really wanting to do another one,  so I went ahead and ordered it while we
still can.  

73, David AJ4TF






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