[Elecraft] K3S 10MHz GPSDO Frequency & Time?

[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 <cbjesseeNH at comcast.net> 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
>
>
>
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