[Elecraft] [K2] K2 # 7841 is working

[Dave Sublette]

Congratulations David,

For those of us who build, there is nothing quite like the thrill of seeing
something we have built come to life for the first time!  I hope to hear
you on the air.

73,

Dave, K4TO

K2 and KX3 owner

On Wed, Sep 19, 2018 at 12:45 AM aj4tf <aj4tf at arrl.net> wrote:

> 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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