Hi Bill:
>Hello! I am curious about where I could buy the blank circuit board
>for the "thru-hole" version of the visible CW tuning indicator. Does
>Far Circuits carry them?
I have a thru-hole board design for this circuit. It's somewhat larger than
the SMD version, but works just as well.
I don't think I have any board currently in stock, but I can knock out a
few for you... $6 each ppd to your mailbox.
I don't think I'd try to fit a thru-hole PC board into the KX1... even the
SMD version is a bit tight, and the thru-hole version would be quite a
challenge, I think.
>I have several radios around that could benefit from this (a KX1,
>Kenwood TS-830S, even an old Drake TR-4C) and I wanted to experiment
>with adding an op-amp and tiny microphone upstream of the tuning
>indicator so that I could build it into it's own box, with power
>supply (probably battery) and it's own LED. That way, I could simply
>set it out on the table and watch the LED to see it flash with the
>incoming CW when I am spot on. These rigs have different offsets
>(Kenwood is 800 Hz, I run my KX1 at 600, Drake is way up there at
>about 1K and not adjustable) so I would add a fairly well calibrated
>"spot frequency" adjustment.
You'll probably want to include a THRESHOLD control in an external
version... the PLL IC is very(!) sensitive and it doesn't take much drive
at all to start it working, and not all that much to overdrive it as
well... that's why we've been trying to install them in the input to the AF
amp, rather at the output (as in the KX1), which does require some
'padding' of the input level to 'tame' things a bit.
>I would rather not build one for each rig and have to build them in.
>This way of doing it sounds feasible to me. I would appreciate any
>comments you might have.
To see the PC board layout and K2 installation info, go to my web site at
www.n0ss.net and drop down just a bit from the very top, to the Quik Links.
Click on the Quik Link titled "K6XX LED CW Tuning Indicator (Thru-Hole
version Installation)", and that will take you to the actual PDF which you
can then download and view.
73,
Tom N0SS
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