10 MHz external reference

[Don Wilhelm-4]

The external reference is only applicable to the K3/K3S with the EXREF
option.

73,
Don W3FPR

On 3/14/2016 3:51 AM, Cortland Richmond wrote:
>
> 50% OT but...
>
> I'm not complaining about stability, mind; the KX3 temperature
> compensation routine works really well, but if I use a GPSDO-clocked
> synthesizer to generate my KX3's clock, will that stabilize the
> on-board synthesizer?  I have a PTS-160.

______________________________________________________________
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]

[Eric Swartz - WA6HHQ]

Hi Ed,

Minor note on our TCXO part numbers:

The tighter temp stability TCXO (0.5 ppm typical) is actually Elecraft part
number "TCXO3-1". This is the p/n that shows on the K3S order page and in the
K3S kit manual as an upgrade.

The standard TCXO (5 ppm) supplied with the K3S and K3 has the part number
"E660033".

Regards,

Eric
/elecraft.com/

On 3/13/2016 6:14 PM, Edward R Cole wrote:

> Guys<
>
> TCXO's use temperature compensating components to try to keep frequency
> stable.  They work fairly well if you are at lower frequencies or not
> multiplying an LO 18 times.  Better is the OCXO (which uses a heater inside an
> insulated "oven" to better keep temperature effects isolated).
>
> The EXREF utilizes the better stability of 10-MHz sources to correct the drift
> of the TCXO.  I does that at a fixed interval in between which both TCXO-1 and
> TCXO-3 will drift.  Per Elecraft's specifications on page 8 the TCXO-3 is 5
> times more stable than the TCXO-1.  I have no idea over what time interval the
> specs are cited, but most assuredly its more than 4 seconds.

....
______________________________________________________________
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]

[Edward R Cole]

Eric,

Thanks for the correction/update.  That fits my measurements,
exactly.  I recall about the time the EXREF came out the better spec
was given on the TCXO03-1.  Regarding the use of wrong part
terminology (TCXO-3) its just sloppy memory of the exact product
number.  I think most knew what is being described.  Interesting that
the TCXO03-1 is ten times better stability over the TCXO.

The EXREF reduces 0.5ppm to 0.1ppm on my K3, which is what was cited,
I believe.

73, Ed - KL7UW

At 08:37 AM 3/14/2016, Eric Swartz - WA6HHQ, Elecraft wrote:

>Hi Ed,
>
>Minor note on our TCXO part numbers:
>
>The tighter temp stability TCXO (0.5 ppm typical) is actually
>Elecraft part number "TCXO3-1". This is the p/n that shows on the
>K3S order page and in the K3S kit manual as an upgrade.
>
>The standard TCXO (5 ppm) supplied with the K3S and K3 has the part
>number "E660033".
>
>Regards,
>
>Eric
>elecraft.com
>
>On 3/13/2016 6:14 PM, Edward R Cole wrote:
>>Guys<
>>
>>TCXO's use temperature compensating components to try to keep
>>frequency stable.  They work fairly well if you are at lower
>>frequencies or not multiplying an LO 18 times.  Better is the OCXO
>>(which uses a heater inside an insulated "oven" to better keep
>>temperature effects isolated).
>>
>>The EXREF utilizes the better stability of 10-MHz sources to
>>correct the drift of the TCXO.  I does that at a fixed interval in
>>between which both TCXO-1 and TCXO-3 will drift.  Per Elecraft's
>>specifications on page 8 the TCXO-3 is 5 times more stable than the
>>TCXO-1.  I have no idea over what time interval the specs are
>>cited, but most assuredly its more than 4 seconds.
>....

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [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]

[Bill Frantz]

The XY RTTY tuning ovals are based on the mark and space signals
which are 170 Hz apart. I can easily tune RTTY signals with the
10 Hz tuning step in the K3, so 10 Hz stability on both the
transmitter and the receiver should be good enough for reliable operation.

With the low stability TCXO and no external reference, I get
good results with RTTY. I don't notice shifts in the ovals.

73 Bill AE6JV

On 3/14/16 at 12:10 AM, [hidden email] (Gary Smith) wrote:

>Something I have wondered since running MMTTY and looking at
>the XY scope is, why do I see the XY ovals shifting clockwise
>as the station is transmitting. I find decoding is best when
>the ovals are as close to straight vertical & horizontal. If I
>let them rotate, I lose the cypher so I have to actively adjust
>VFO A to maintain their proper spacing.

-----------------------------------------------------------------------
Bill Frantz        |The nice thing about standards| Periwinkle
[phone]      |is there are so many to choose| 16345
Englewood Ave
www.pwpconsult.com |from.   - Andrew Tanenbaum    | Los Gatos,
CA 95032

______________________________________________________________
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]