[time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK

[paul swed]

John
GPSDOs fun stuff. But following your logic and I do not disagree with it.
Some other GPSDO most likely will not be 10 X better unless the test one
perhaps is quite poor. I am assuming better means lower noise and smaller
frequency deviation. No matter its pretty hard to say if both GPSDOs are
functioning pretty well.
So about that Cesium or maybe Maser your looking for now. Ebay? Humor
intended.
My next project will be a Lars GPSDO using an arduino and such. Its totally
for fun and I have all of the stuff needed. Whats nice the codes clear.
Though plenty of it.
Then I can see how it does against the hp 3801, TBolt, KS series, Rb and Cs
references.
Good luck.
Paul
WB8TSL

On Mon, Feb 28, 2022 at 5:35 PM David C. Partridge <
david.partridge at perdrix.co.uk> wrote:

> <
> http://www.leobodnar.com/shop/index.php?main_page=index&cPath=107&zenid=15a
> 92055b16c36edbdc83f4ac8fb8abc
> <http://www.leobodnar.com/shop/index.php?main_page=index&cPath=107&zenid=15a92055b16c36edbdc83f4ac8fb8abc>
> >
>
> D.
> -----Original Message-----
> From: David C. Partridge <david.partridge at perdrix.co.uk>
> Sent: 28 February 2022 13:56
> To: 'Discussion of precise time and frequency measurement'
> <time-nuts at lists.febo.com>
> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
> Maybe take a look at:
>
> http://www.leobodnar.com/shop/index.php?main_page=index&cPath=107&zenid=15a9
> 2055b16c36edbdc83f4ac8fb8abc
> <http://www.leobodnar.com/shop/index.php?main_page=index&cPath=107&zenid=15a92055b16c36edbdc83f4ac8fb8abc>
>
> -----Original Message-----
> From: John Moran, Scawby Design <john at scawbydesign.co.uk>
> Sent: 28 February 2022 13:26
> To: time-nuts at lists.febo.com
> Subject: [time-nuts] GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
> With all this interesting talk about -
>
> a) How hard it was to build a GPSDO from scratch and
> b) How, to measure a signal accurately, you need a reference circa 10x
> better
>
> I started to get worried since I want to do both. To help with the latter I
> have acquired an HP5370A that just needs picking up from Scotland, where I
> was hoping to maybe pick up some surplus oscillators as well. But the 10x
> specs in the discussions got me worried enough to look around for a known
> good GPSDO rather than buying a bag-full from China and trying to sort out
> a
> good one.
>
> I found this -
>
> https://www.rfx.co.uk/pdfs/GPS_OCXO_1300_10_module.pdf
>
> and have been quoted £500 as a special deal (they normally have a £1,000
> minimum one-off charge).
>
> Can anyone please pass some sort of judgement on whether its specs are good
> enough to stand in as my master reference until I can find a Rubidium
> device
> on this side of the pond.
>
> John
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