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Now looking for a K3S KTCXO3-1

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Gary Peterson

Now looking for a K3S KTCXO3-1

A replacement K3S KTCXO3-1 is no longer available from Elecraft. Does anyone have a stable KTCXO3-1, surplus to their needs, that they would consider selling?
Even a standard, plus or minus 5 ppm TCXO might possibly be an improvement.

There are also some, alleged, KTCXO3-1 oscillator modules for sale on eBay for about 40 bucks. Has anyone had experience with any of these?

Thanks, in advance, for any advice, opinions or admonishments.

Gary, K0CX

>IMHO and a nutshell, the TCXO isn't.
>Wes? N7WS

> Am I being overly critical, or do you think this is unusual behavior for a KTCXO3-1?
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Wes Stewart-2

Re: Now looking for a K3S KTCXO3-1

If it mattered to me I would give the Chinese version a shot.

Wes N7WS

On 3/10/2021 6:18 AM, Gary Peterson wrote:
> A replacement K3S KTCXO3-1 is no longer available from Elecraft. Does anyone have a stable KTCXO3-1, surplus to their needs, that they would consider selling?
> Even a standard, plus or minus 5 ppm TCXO might possibly be an improvement.
>
> There are also some, alleged, KTCXO3-1 oscillator modules for sale on eBay for about 40 bucks. Has anyone had experience with any of these?
>
> Thanks, in advance, for any advice, opinions or admonishments.
>
> Gary, K0CX

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Mark Goldberg

Re: Now looking for a K3S KTCXO3-1

If the Chinese TCXOs for the K3 are anything like the ones for Kenwood I
have measured, they exhibit much higher phase noise. That will result in
much increased transmit phase noise. That will interfere with anyone trying
to listen close to you in location and frequency.

The K3 is a good neighbor, which is one of the reasons it is prized for
DXpeditions and Multi Radio contest stations.

73,

Mark
W7MLG

On Wed, Mar 10, 2021, 7:33 AM Wes <[hidden email]> wrote:

> If it mattered to me I would give the Chinese version a shot.
>
> Wes N7WS
>
> On 3/10/2021 6:18 AM, Gary Peterson wrote:
> > A replacement K3S KTCXO3-1 is no longer available from Elecraft. Does
> anyone have a stable KTCXO3-1, surplus to their needs, that they would
> consider selling?
> > Even a standard, plus or minus 5 ppm TCXO might possibly be an
> improvement.
> >
> > There are also some, alleged, KTCXO3-1 oscillator modules for sale on
> eBay for about 40 bucks. Has anyone had experience with any of these?
> >
> > Thanks, in advance, for any advice, opinions or admonishments.
> >
> > Gary, K0CX
>
> ______________________________________________________________
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Wes Stewart-2

Re: Now looking for a K3S KTCXO3-1

Ok.

How did you measure phase noise?

Wes N7WS

On 3/10/2021 7:55 AM, Mark Goldberg wrote:

> If the Chinese TCXOs for the K3 are anything like the ones for Kenwood I
> have measured, they exhibit much higher phase noise. That will result in
> much increased transmit phase noise. That will interfere with anyone trying
> to listen close to you in location and frequency.
>
> The K3 is a good neighbor, which is one of the reasons it is prized for
> DXpeditions and Multi Radio contest stations.
>
> 73,
>
> Mark
> W7MLG
>
> On Wed, Mar 10, 2021, 7:33 AM Wes <[hidden email]> wrote:
>
>> If it mattered to me I would give the Chinese version a shot.
>>
>> Wes N7WS
>>
>> On 3/10/2021 6:18 AM, Gary Peterson wrote:
>>> A replacement K3S KTCXO3-1 is no longer available from Elecraft. Does
>> anyone have a stable KTCXO3-1, surplus to their needs, that they would
>> consider selling?
>>> Even a standard, plus or minus 5 ppm TCXO might possibly be an
>> improvement.
>>> There are also some, alleged, KTCXO3-1 oscillator modules for sale on
>> eBay for about 40 bucks. Has anyone had experience with any of these?
>>> Thanks, in advance, for any advice, opinions or admonishments.
>>>
>>> Gary, K0CX
>> ______________________________________________________________
>> 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]
> ______________________________________________________________
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Mike Cizek W0VTT

Re: Now looking for a K3S KTCXO3-1

In reply to this post by Mark Goldberg

Greetings -

I have a KTCXO3, a Chinese copy, and the standard oscillator. I tested the
standard and Chinese ones against WWV at 10 MHz using the Freq Cal mode in
WSJT-X over a four hour period. This isn't exactly a laboratory grade test,
but is the best I can do.

The total error for the Chinese TCXO was 1.26 Hz
Total error for the stock oscillator was 0.98 Hz
I'll test the KTCXO3 later today.
I'm not a math major, but that looks like about 0.1PPM error. Tests were
run after the K3s had been on for a few hours.

I don't have the tools to measure phase noise. Would having a local with a
panadaptor look at my transmitted signal using the different oscillators be
sufficient?

This is the Chinese oscillator I bought from Ebay:
https://www.ebay.com/itm/KTCXO-3-Compatible-Elecraft-K3-TCXO-1-PPM-High-Stab
ility-Ref-Osc-Compatible/182814802678?hash=item2a909c82f6:g:7qsAAOSwWr5Z2Y7t

----
73,
Mike Cizek W0VTT

-----Original Message-----
From: [hidden email] <[hidden email]> On
Behalf Of Mark Goldberg
Sent: Wednesday, 10 March, 2021 08:56
To: Elecraft Mailing List <[hidden email]>
Subject: Re: [Elecraft] Now looking for a K3S KTCXO3-1

If the Chinese TCXOs for the K3 are anything like the ones for Kenwood I
have measured, they exhibit much higher phase noise. That will result in
much increased transmit phase noise. That will interfere with anyone trying
to listen close to you in location and frequency.

The K3 is a good neighbor, which is one of the reasons it is prized for
DXpeditions and Multi Radio contest stations.

73,

Mark
W7MLG

On Wed, Mar 10, 2021, 7:33 AM Wes <[hidden email]> wrote:

> If it mattered to me I would give the Chinese version a shot.
>
> Wes N7WS
>
> On 3/10/2021 6:18 AM, Gary Peterson wrote:
> > A replacement K3S KTCXO3-1 is no longer available from Elecraft.
> > Does
> anyone have a stable KTCXO3-1, surplus to their needs, that they would
> consider selling?
> > Even a standard, plus or minus 5 ppm TCXO might possibly be an
> improvement.
> >
> > There are also some, alleged, KTCXO3-1 oscillator modules for sale
> > on
> eBay for about 40 bucks. Has anyone had experience with any of these?
> >
> > Thanks, in advance, for any advice, opinions or admonishments.
> >
> > Gary, K0CX
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]

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Mark Goldberg

Re: Now looking for a K3S KTCXO3-1

In reply to this post by Wes Stewart-2

I have a Perseus SDR set up to measure phase noise, and also had
access to a high dollar phase noise measurement system. The Perseus
was sufficient to see the difference, about a 20 dB increase at 15 kHz
or so, which is significant. I have links to my setup on my qrz.com
page.

73,

Mark
W7MLG

On Wed, Mar 10, 2021 at 8:51 AM Wes <[hidden email]> wrote:

>
> Ok.
>
> How did you measure phase noise?
>
> Wes N7WS
>
>
> On 3/10/2021 7:55 AM, Mark Goldberg wrote:
> > If the Chinese TCXOs for the K3 are anything like the ones for Kenwood I
> > have measured, they exhibit much higher phase noise. That will result in
> > much increased transmit phase noise. That will interfere with anyone trying
> > to listen close to you in location and frequency.
> >
> > The K3 is a good neighbor, which is one of the reasons it is prized for
> > DXpeditions and Multi Radio contest stations.
> >
> > 73,
> >
> > Mark
> > W7MLG
> >
> > On Wed, Mar 10, 2021, 7:33 AM Wes <[hidden email]> wrote:
> >
> >> If it mattered to me I would give the Chinese version a shot.
> >>
> >> Wes N7WS
> >>
> >> On 3/10/2021 6:18 AM, Gary Peterson wrote:
> >>> A replacement K3S KTCXO3-1 is no longer available from Elecraft. Does
> >> anyone have a stable KTCXO3-1, surplus to their needs, that they would
> >> consider selling?
> >>> Even a standard, plus or minus 5 ppm TCXO might possibly be an
> >> improvement.
> >>> There are also some, alleged, KTCXO3-1 oscillator modules for sale on
> >> eBay for about 40 bucks. Has anyone had experience with any of these?
> >>> Thanks, in advance, for any advice, opinions or admonishments.
> >>>
> >>> Gary, K0CX
> >> ______________________________________________________________
> >> 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]
>
>
> ______________________________________________________________
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Wes Stewart-2

Re: Now looking for a K3S KTCXO3-1

Thanks. Very nice!

Wes

On 3/10/2021 11:16 AM, Mark Goldberg wrote:

> I have a Perseus SDR set up to measure phase noise, and also had
> access to a high dollar phase noise measurement system. The Perseus
> was sufficient to see the difference, about a 20 dB increase at 15 kHz
> or so, which is significant. I have links to my setup on my qrz.com
> page.
>
> 73,
>
> Mark
> W7MLG