KTCX03-1 high stability reference oscillator

[hbjr]

Hey Folks.

In real world "seat-of-the-pants" experience, what difference if any would I
see upgrading to the KTCX03-1?  I eventually would add the reference kit to
the internal 2 meter transverter.

 

One thought was improvement for FT8 (and eventually FT4) on HF and MFSK on 2
meters.  I have read some saw an improvement in transmitted phase noise -
especially with a linear amp.

 

I'm just trying to prioritize my K3S upgrades before there are no K3S parts
left to go around!!

 

Hank

K4HYJ

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[Don Wilhelm]

Hank,

The real world difference is that you will see less change with
temperature changes with the high stability TCXO.

The phase noise improvement is provided with the new synthesizers and
not with the TCXO.

73,
Don W3FPR

On 5/19/2019 1:35 PM, [hidden email] wrote:

> Hey Folks.
>
> In real world "seat-of-the-pants" experience, what difference if any would I
> see upgrading to the KTCX03-1?  I eventually would add the reference kit to
> the internal 2 meter transverter.
>
>  
>
> One thought was improvement for FT8 (and eventually FT4) on HF and MFSK on 2
> meters.  I have read some saw an improvement in transmitted phase noise -
> especially with a linear amp.

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[Jim - N4ST]

Hank,

From time to time I do meteor scatter on 6M and being 200 Hz off with
MSK-144 means you won't decode.
While the standard oscillator should keep me within bounds when properly
calibrated, I experienced problems.
Installing a new KTCX03 cured my stability issues.
This wouldn't be a problem on the JT or FT modes, but some other future
exotic digital mode might be more demanding.

_________
73,
Jim - N4ST

-----Original Message-----
From: [hidden email] <[hidden email]> On
Behalf Of [hidden email]
Sent: Sunday, May 19, 2019 13:36
To: [hidden email]
Subject: [Elecraft] KTCX03-1 high stability reference oscillator

Hey Folks.

In real world "seat-of-the-pants" experience, what difference if any would I
see upgrading to the KTCX03-1?  I eventually would add the reference kit to
the internal 2 meter transverter.

 

One thought was improvement for FT8 (and eventually FT4) on HF and MFSK on 2
meters.  I have read some saw an improvement in transmitted phase noise -
especially with a linear amp.

 

I'm just trying to prioritize my K3S upgrades before there are no K3S parts
left to go around!!

 

Hank

K4HYJ

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[hbjr]

Thanks Jim….Good feedback.  

Any other worthwhile mods to achieve stability?

Hank
K4HYJ


From: Jim - N4ST
Sent: Sunday, May 19, 2019 4:49 PM
To: [hidden email]; [hidden email]
Subject: RE: [Elecraft] KTCX03-1 high stability reference oscillator

Hank,

From time to time I do meteor scatter on 6M and being 200 Hz off with
MSK-144 means you won't decode.
While the standard oscillator should keep me within bounds when properly
calibrated, I experienced problems.
Installing a new KTCX03 cured my stability issues.
This wouldn't be a problem on the JT or FT modes, but some other future
exotic digital mode might be more demanding.

_________
73,
Jim - N4ST

-----Original Message-----
From: [hidden email] <[hidden email]> On
Behalf Of [hidden email]
Sent: Sunday, May 19, 2019 13:36
To: [hidden email]
Subject: [Elecraft] KTCX03-1 high stability reference oscillator

Hey Folks.

In real world "seat-of-the-pants" experience, what difference if any would I
see upgrading to the KTCX03-1?  I eventually would add the reference kit to
the internal 2 meter transverter.

 

One thought was improvement for FT8 (and eventually FT4) on HF and MFSK on 2
meters.  I have read some saw an improvement in transmitted phase noise -
especially with a linear amp.

 

I'm just trying to prioritize my K3S upgrades before there are no K3S parts
left to go around!!

 

Hank

K4HYJ

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[Elecraft mailing list]

Yes, a 10MHz GPS locked reference source. Or wait for about an hour from
cold for the TXCO to stabilise. Calibration might be off, east to
correct, but it will not be moving much.

Regards,

Mike VP8NO



On 19/05/2019 18:02, HB wrote:
> Thanks Jim….Good feedback.
>
> Any other worthwhile mods to achieve stability?
>
> Hank
> K4HYJ
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[hbjr]

More good info!!  I went ahead and ordered the KTCX03-1 and the 2m transverter reference lock upgrade.



From: Mike Harris via Elecraft
Sent: Sunday, May 19, 2019 5:41 PM
To: [hidden email]
Subject: Re: [Elecraft] KTCX03-1 high stability reference oscillator

Yes, a 10MHz GPS locked reference source. Or wait for about an hour from
cold for the TXCO to stabilise. Calibration might be off, east to
correct, but it will not be moving much.

Regards,

Mike VP8NO



On 19/05/2019 18:02, HB wrote:
> Thanks Jim….Good feedback.
>
> Any other worthwhile mods to achieve stability?
>
> Hank
> K4HYJ
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[Edward R Cole]

Elecraft specs from my 2010 K3:
TCXO01 = +/- 5ppm for 0 to 50c
TCXO03 = +/- 1ppm

But I recall Wayne stating the TCXO03 actually does close to 0.5 ppm

At 28-MHz 5ppm = 140 Hz, 1ppm = 28 Hz, 0.5ppm = 14 Hz

I installed the EXREF on my K3 with an external OCXO 10-MHz standard.
At 28-MHz  I measure +/- 1.5 Hz (counter toggles between 1-Hz and
2-Hz offset) with the TCXO03.  It would be 7.5 Hz using the TCXO01.

Since I operate digital eme on frequencies up to 10-GHz this is useful.

73, Ed - KL7UW
   http://www.kl7uw.com
Dubus-NA Business mail:
   [hidden email]  

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[Bob McGraw - K4TAX]

I ordered my K3S with the optional KTCX03-1-F which the description
shows "1 ppm f/w correction to 0.5 ppm, factory installed".

In 3+ years of use, I check the calibration on a monthly basis. I find
it to be always better than +/- 1 Hz at 10 MHz.   I have adjusted the
Ref Osc as needed.  I find it to  be well worth the addition.

73

Bob, K4TAX



On 5/20/2019 9:30 AM, Edward R Cole wrote:

> Elecraft specs from my 2010 K3:
> TCXO01 = +/- 5ppm for 0 to 50c
> TCXO03 = +/- 1ppm
>
> But I recall Wayne stating the TCXO03 actually does close to 0.5 ppm
>
> At 28-MHz 5ppm = 140 Hz, 1ppm = 28 Hz, 0.5ppm = 14 Hz
>
> I installed the EXREF on my K3 with an external OCXO 10-MHz standard.
> At 28-MHz  I measure +/- 1.5 Hz (counter toggles between 1-Hz and 2-Hz
> offset) with the TCXO03.  It would be 7.5 Hz using the TCXO01.
>
> Since I operate digital eme on frequencies up to 10-GHz this is useful.
>
> 73, Ed - KL7UW
>   http://www.kl7uw.com
> Dubus-NA Business mail:
>   [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
>

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