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 < [email protected]> 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 <[email protected]> > Sent: 28 February 2022 13:56 > To: 'Discussion of precise time and frequency measurement' > <[email protected]> > 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 <[email protected]> > Sent: 28 February 2022 13:26 > To: [email protected] > 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 > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an > email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an > email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send > an email to [email protected] > To unsubscribe, go to and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
