[Elecraft] CW Zero-Beat Indicator

[David Pratt]

In a recent message, Dan Copeland <n0dt@swbell.net> said....
>A few years ago Jerry KR5L designed a CW Zero-Beat Indicator for the K2.
>I have the board and parts that I bought back then. I did not keep up on this
>and am wondering if it is worth building and installing in my new K2.
>
>Does anyone have any info about this mod?  Were there any problems?

This really depends on how tone-deaf you are, Dan.  I built it and am 
glad I did as it enables tuning an incoming signal to precisely the same 
as your sidetone (offset) setting. As recommended, I fitted a miniature 
green LED in the centre of the square Rate button.  In a way, I was 
surprised that Elecraft did not include this mod in the Revision B 
board.  There was a .PDF file on Tom N0SS's site but I can't find it 
now.  I do have the file if you would like it sending.  It gives a 
description, circuit and PCB layout.

Sverre LA3ZA did produce a CMOS version of the device using an LMC567. 
He said it drew 0.9mA instead of 20mA in the original LM567 version, but 
I did not build that one as I was quite happy with the original. Current 
was not an issue with me and I could not readily find an LMC567 anyway.

Let me know if you would like the file sending.

73 de David G4DMP