[Elecraft] K3S XREF GPSDO recommendation needed

[Steve Lund]

That depends on how the external reference is  used.

The K3 uses a counter lock scheme that does NOT change the phase noise of
the internal oscillator. This is real obvious if you measure the 'locked'
oscillator. When locked it still drifts around +/- 0.5 Hz. This is just
marginally good enough for the ARRL Frequency Measuring Tests.

Steve, K6UM

On Wed, Jun 6, 2018 at 12:55 PM, John Harper <johnae5x at gmail.com> wrote:

> In this podcast Eric gives a very interesting talk on various factors that
> influence receiver performance. The entire audio program is well worth
> listening to:
>
> https://www.hamradioworkbench.com/podcast/understanding-hf-
> receiver-specifications
>
> At some point a bit over halfway in, Eric mentions that an external GPS
> reference could actually contribute to phase noise, so you've gained freq
> stability/accuracy for increased noise.
>
> No free lunch!
>
> John AE5X
> https://ae5x.blogspot.com
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