Hi Tom:
This sounds like a great addition to the K2. Is its purpose to indicate a
zero beat?
Actually, to indicate "CLOSE TO ZERO BEAT"...usually +/- 20 or so Hz.
Your post sounds as if there are already some CW tuning indicators out
there and that you have developed a way to incorporate them into the K2,
using the LED as an indicator.
There are MANY indicators out there! Several years ago, Jerry, KR5L, posted
(on this reflector) his design using an NE567. I designed up a PC board and
a number of those boards were made available to builders. Jerry's design
works very well!!! In fact, I just this morning read yet another
testimonial from a satisfied builder (which made his own board, or possibly
just haywired the design).
The K6XX design uses a different IC (Exar XR-2211, which I consider to be a
somewhat superior PLL, both with regard to input sensitivity and speed of
response. Other than that, I think either design should work well fir builders.
I claim NO OWNERSHIP of ANY OF THESE DESIGNS. Nor do I claim ownership of
the use of the 10th LED in the K2 display. I'm just trying to provide a bit
more comprehensive documentation for them.
If this is the case can you be so kind as to point me in the direction of
a site which can give the details to build the tuning indicator. Also, if
you could send me your PDF file on installing an indicator into the K2, I
would very much appreciate that also.
You can find the docs for both the KR5L and the K6XX LED CW Tuning
Indicators on my web site:
www.n0ss.net
under "Other Stuff" (almost to the bottom of the page).
Hope this helps.
73,
Tom N0SS
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