Hi Bob, Indeed! I must admit I thought at first that the LPRO was one of unit with built-in discipling to an external 1PPS. If this guy was selling in the UK he would be breaking advertising rules with his claims. I can see no validity for his claim of NIST traceability. NIST specifically say that the GPS signal (let alone the output of a GPSDO) is only traceable after the fact by analysing the monitoring data. Robert G8RPI
--- On Fri, 8/1/10, Bob Camp <[email protected]> wrote: From: Bob Camp <[email protected]> Subject: Re: [time-nuts] LPRO-GPSDO To: "Discussion of precise time and frequency measurement" <[email protected]> Date: Friday, 8 January, 2010, 16:38 Hi The process of properly locking the gps to the rubidium is a lot more complex than running a simple phased lock loop and lighting a light. I would be at least as concerned about the firmware in the device as about the gps receiver .... Bob On Jan 8, 2010, at 8:36 AM, Robert Atkinson wrote: > On the original thread, I enquired who "refurbished" the LPRO's and what it > included. Basically it's done by the seller and is a C field adjustment and > lamp voltage check. Personally I'd call that "tested and adjusted as > required". Refurbished implies to me that wear-out parts have been replaced. > The NIST tracability is "the micro checks the GPS and LPRO and lights the > LED" no reply on what type of GPS is fitted or if it goes into position hold. > Buyer Beware! Trouble is less informed buyers may be taken in. > > Robert G8RPI. > > --- On Wed, 6/1/10, AL1 <[email protected]> wrote: > > > From: AL1 <[email protected]> > Subject: Re: [time-nuts] LPRO-GPSDO > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Date: Wednesday, 6 January, 2010, 11:41 > > > HI all, > > have a lok to : > http://pagesperso-orange.fr/f5cau/ol_shf/OL9HX.pdf > > very interesting for those who read french. > Alain > F4GBC > > ----- Original Message ----- From: <[email protected]> > To: <[email protected]> > Sent: Wednesday, January 06, 2010 4:18 AM > Subject: [time-nuts] LPRO-GPSDO > > >> >> In searching on-line for ways to construct a 10 MHz to 100 MHz multiplier, >> I came across an interesting product offered by Silicon Forest Solutions >> _http://www.TenMHz.com_ (http://www.TenMHz.com) . Their LPRO-GPSDO >> incorporates a refurbished LPRO rubidium oscillator, disciplined by a GPS >> receiver, >> for less than $500. It looks pretty clever and compact. Perhaps this >> product is offered by a member of this list who could tell us more about it. >> >> Bruce Hunter, KG6OJI >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
