[time-nuts] LPRO-GPSDO

Robert Atkinson robert8rpi at yahoo.co.uk
Fri Jan 8 18:43:25 UTC 2010


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 <lists at cq.nu> wrote:


From: Bob Camp <lists at cq.nu>
Subject: Re: [time-nuts] LPRO-GPSDO
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
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 <alain2.bouchet at wanadoo.fr> wrote:
> 
> 
> From: AL1 <alain2.bouchet at wanadoo.fr>
> Subject: Re: [time-nuts] LPRO-GPSDO
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> 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: <brucekareen at aol.com>
> To: <time-nuts at febo.com>
> 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
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> 
> 
> 
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