[Elecraft] Using the K2's 10th S-meter LED for CW Tuning indication

[Tom Hammond]

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