K3S XREF GPSDO recommendation needed

[John Harper]

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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[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 <[hidden email]> 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
> ______________________________________________________________
> 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]
>

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