[time-nuts] Re: Seems like the new version PN2060C is available for sale US$680

[Bob Camp]

Hi

The referenced picture appears to show multiple bundles of batteries driving various bits and pieces of their test rig. They do appear to have reduced the likely hood of the problem coming from their test setup. Of course one can never be sure (as I’ve proven on the bench a number of times). 

Doing a fiber optic interface is an interesting approach. How you do a two way link to the computer, at an affordable price. is a bit unclear to me. Maybe there is an obvious answer I’ve missed … 

Bob

> On Oct 7, 2023, at 10:07 AM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> 
> Bob Camp via time-nuts writes:
> 
>> One way or the other, the spurs are from an internal source in the device. […]
>  That is why I was surprised to see that they retained the USB interface ? 
> 
> As a first order approximation, anything related to USB is cost
> optimized, and therefore EMI/EMC efforts terminate the moment the
> spurs are 3dB under the template.
> 
> They do have a comment about stationary vs. laptop giving different
> spurs, so I guess they are aware of it.
> 
> At that level of ambition I would have reached for batteries +
> linear PSU + fiber-optics, even though it would be both more
> cumbersome and costly.
> 
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe    
> Never attribute to malice what can adequately be explained by incompetence.