[Elecraft] zero-beating a KX1

[Walter Underwood]

If getting to exactly the sidetone frequency works, an instrument tuner box (or app) might do the job. I don’t know enough to recommend one, but I see some devices for $30 or less and some apps ranging from free to a few dollars.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jun 9, 2020, at 2:29 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
> 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
>> Sent from Mail for Windows 10
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