K3S 10MHz GPSDO Frequency & Time?

[MaverickNH]

I have the K3EXREF and XTCXO3-1 installed on my K3s and have a Jackson Labs LC-XO-Plus GPSDO attached to the factory-installed port. The config setting REF*CAL shows the * to be blinking, indicating data is being received.

I tuned into WWV 10MHz and found that my K3s time was pretty far off, based on the audible signal. Using Config:Time, I can adjust the time to match the audible beat. I guess the K3EXREF address frequency but not clock time?

I have a separate GPSDO running from ToyNTP http://www.dxatlas.com/ToyNtp/ to keep my PC on time to less than +/- 50 microseconds. There's some high latency somewhere... But digital modes like WSPR have adequately accurate reference time.

Bret/N4SRN

[kstover]

Correct.


On 8/27/2016 8:24 PM, MaverickNH wrote:
> I guess the K3EXREF address frequency but not clock time?
>
>

--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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[Clay Autery]

I'll be adding "How to keep K3s time up to date continuously" to my list...

Know I can manually do it via the utility...  perhaps there's a way to
write a macro to grab the time from my laptop (a la the Utility)...

Ideally, I'd like the K3 to follow my Stratum 1 NTP server...

73,

______________________
Clay Autery, KY5G
MONTAC Enterprises
[phone]

On 8/27/2016 9:09 PM, Kevin wrote:
> Correct.
>
>
> On 8/27/2016 8:24 PM, MaverickNH wrote:
>> I guess the K3EXREF address frequency but not clock time?
>>
>>
>

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[Christopher Hoover]

There are a couple different things to consider here:

- syntonization and synchronization  of the oscillator for the TX/RX synth

- syntonization and synchronization of the oscillator driving the real time
clock (i.e. counter)

- setting of the real time clock

My understanding is that the external reference to the K3/K3S  is only used
to FLL the oscillator for the RX/TX synthesizer.    PLL is not used because
of phase noise concerns.   So you get syntonization (frequency) but not
synchronization (phase).

I haven't looked at the RTC schematic, but my strong guess is that it has
its own crystal that is free running, even with the external ref.

-ch
de AI6KG



On Sat, Aug 27, 2016 at 6:24 PM, MaverickNH <[hidden email]> wrote:

> I have the K3EXREF and XTCXO3-1 installed on my K3s and have a Jackson Labs
> LC-XO-Plus GPSDO attached to the factory-installed port. The config setting
> REF*CAL shows the * to be blinking, indicating data is being received.
>
> I tuned into WWV 10MHz and found that my K3s time was pretty far off, based
> on the audible signal. Using Config:Time, I can adjust the time to match
> the
> audible beat. I guess the K3EXREF address frequency but not clock time?
>
> I have a separate GPSDO running from ToyNTP http://www.dxatlas.com/ToyNtp/
> to keep my PC on time to less than +/- 50 microseconds. There's some high
> latency somewhere... But digital modes like WSPR have adequately accurate
> reference time.
>
> Bret/N4SRN
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.
> nabble.com/K3S-10MHz-GPSDO-Frequency-Time-tp7621858.html
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>

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[MaverickNH]

Thanks y'all - that sets me straight.

Clay, if you come up with a solution, let us know!

Bret/N4SRN