Even if you do put the K1 on 12 or 10 meters the lack of conversion gain
of the front end ('612 mixer) at those frequencies will make it a bit
hard of hearing...probably around -115 dBm or so. I know this from
building several '612-based rigs for 10 meters.
My suggestion...homebrew a Sierra circuit using an RF amp in the front
end(J310 works well). I have also built a rig loosely based on the SST
for 10 and one with a heterodyne VFO based on the NORCAL 40 for 10 M
also. There may be(?) certain trade-offs using an amp in the front end
running an active mixer but if you can't hear them...
If anyone wants assistance in building such a radio I am cerainly
willing to lend a hand.
If you have or can get some old K2 IF crystals(the ones that were
replaced in the "B" upgrade to the higher-Q crystals back a'ways)...
they still make pretty good filters for a Sierra or NORCAL 40, or
whatever you can come up with...and you don't have to match/buy new
ones, although doing that is not a big deal either... if you have a
freq. counter and scope.
Ten meters is my favorite HF band...isn't it yours?
Mike Fitz N0MF
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