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

[drew wollin]

Hi

The spurs are an issue, but their cause seems a mystery to me. However, it occurred to me today that they may be odd harmonics (or "sub-harmonics" for overtone crystals over 20 MHz).

This seems a plausible explanation as there shouldn't be such high phase noise that far from the DUT frequency.

The spurs change with frequency as per the YouTube video.

I have emailed the PN2060C maker to see what he thinks.

The commercial analysers may be aware of the harmonics as spurs and have scripts to remove them.

Any thoughts?

Regards Drew VK4ZXI

https://www.youtube.com/watch?v=wKDBUkGKul8&ab_channel=heisenberg


Subject: [time-nuts] Re: Seems like the new version PN2060C is
        available for sale US$680
To: Discussion of precise time and frequency measurement
        <time-nuts at lists.febo.com>
Message-ID: <618AFACD-623D-487B-916B-60DA01A1D3DE at n1k.org>
Content-Type: text/plain;       charset=utf-8

Hi

Looking at their plot of the 10 MHz OCXO into both inputs:

There are some pretty significant spurs on that plot. From the notes below it, they seem to still be digging into the source of those spurs and ways to reduce / eliminate them. I think there still is a bit more work to be done. They imply the fix could be hardware rather than software. If so, I’d wait for the next version ….

Bob

> On Oct 3, 2023, at 2:29 AM, drew wollin via time-nuts <time-nuts at lists.febo.com> wrote:
>
> Hi All
>
> According to the updated PN2060c webpage, the new version is now available for sale at US$680.
>
> It has an improved noise floor and less trouble with spikes. The device is a significant rework of the original PN2060A design.
>
> I have the PN2060A and am very impressed by it. The new version looks better.
>
> Regards Drew VK4ZXI
>
>
> https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fqsl.net%2Fbg6khc%2Fpn2060c_phase_noise_analyzer.htm&data=05%7C01%7C%7C20523c9c8c9c4c8af7de08dbc4abd78b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638320014592530175%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=zsmd4nUk8qfEsdfHvcwMuxxw1neqLh5lJ%2F%2FWY5uh%2BM8%3D&reserved=0<https://qsl.net/bg6khc/pn2060c_phase_noise_analyzer.htm>
> ___