[Elecraft] zero-beating a KX1

[Don Wilhelm]

Tom Hammond N0SS's (SK) website is mostly intact thanks to the Mid 
Missouri Amateur Radio Club.  It is a valuable resource.

You can find the files for the K1 and KX1 CW Tuning Indicator (SMD 
version) at http://www.mmccs.com/mmarc/n0ss/index_k1.html.

If you have capability to etch your own boards, Tom recorded full size 
images.  You might also try emailing Fred at FAR Circuits to see if he 
can create the boards.  I believe Tom may have used him as his board 
supplier.

73,
Don W3FPR

On 6/8/2020 7:33 PM, Frederick Dwight wrote:
> If you do a google search on KX1 zero beat indicator or cw zero beat indicator you will see several circuits demonstrated.  Some like the one which uses the LM567 (non SMT) part and had
> a white LED seemed to be good, much less than 100 Hz BW and had the schematic, but some others seemed to be much too broad, perhaps hundreds of Hz wide. My circuit
> needed quite a bit of audio drive, so rigged up a small 500-500 CT audio transformer and used the primary as a autotransformer to double the audio voltage
> to the circuit which did not change the earphone volume but enabled the detector to operate without opening up the audio gain too much on any of my rigs.
>            Good Luck   Rick  KL7CW
> 
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