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zero-beating a KX1

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Rick Dwight

zero-beating a KX1

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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Don Wilhelm

Re: zero-beating a KX1

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
>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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>

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Elecraft mailing list

Re: zero-beating a KX1

http://www.wb9kzy.com/gzb.htm

This Zerobeat kit looks like it’s still available, might be worth a look. If anyone does please report back, I’m still banging away on my KX1 as well

Scott ka9p

Make something good happen!

> On Jun 9, 2020, at 4:30 PM, Don Wilhelm <[hidden email]> 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
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Don Wilhelm

Re: zero-beating a KX1

Scott,

From what source? The latest was that WA3AAL is also SK.

73,
Don W3FPR

On 6/9/2020 9:38 PM, SCOTT MCDONALD wrote:

> http://www.wb9kzy.com/gzb.htm
>
> This Zerobeat kit looks like it’s still available, might be worth a
> look. If anyone does please report back, I’m still banging away on my
> KX1 as well
>
> Scott ka9p
>
> Make something good happen!
>
>> On Jun 9, 2020, at 4:30 PM, Don Wilhelm <[hidden email]> 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
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]

Don Wilhelm

Re: zero-beating a KX1

In reply to this post by Elecraft mailing list

Sorry, but I did not look at your link until after I sent my response.
While that DIP version may work in a K2, I doubt that it can be squeezed
into a KX1.
73,
Don W3FPR
----------------------------------------------------------------------------------------------
Scott,

From what source? The latest was that WA3AAL is also SK.

73,
Don W3FPR

On 6/9/2020 9:38 PM, SCOTT MCDONALD wrote: