[time-nuts] FTS125 GPS Module

[Bob Camp]

Hi

There are a lot of pathogenic firmware releases for some of the CW parts…

Bob


On Jun 28, 2012, at 7:59 PM, SAIDJACK at aol.com wrote:

> Yes, I am sure, depends on the firmware revision and configuration  
> settings. Don't want to name any names here though. Secondary firmware can  detect, 
> and prevent this behavior once you know it exists, and what makes it  
> happen.
> 
> That's part of what makes the difference between an NCO and a real GPSDO.  
> With an NCO such as the FTS parts, you get a simple analog PLL that has no  
> smarts or intelligence, and a GPS receiver that can get hung up when in 
> holdover  for excessive amounts of time.
> 
> There is ample evidence in the time nuts archives that the Trimble GPS have 
> problems getting a fix in the first place after power-on. Several users  
> reported that here, and in other places.
> 
> Also, now we are being told that Trimble discontinued the Mini-T, and we  
> see lot's of customers panicking and looking for replacement solutions as  
> Trimble seems to not want to offer a replacement product and is giving a  
> last-time-buy notice. Sorry for those customers, gives an opportunity for others 
> to move in.
> 
> bye,
> Said
> 
> 
> 
> In a message dated 6/28/2012 12:21:27 Pacific Daylight Time,  
> azelio.boriani at screen.it writes:
> 
>> other GPS receivers have the same exact problems when left  in
>> holdover for hours or more
> 
> Are you sure? Never seen that  behavior on a Trimble, Motorola/iLotus,
> uBlox, Sanav or SkyTraq   receiver, only on NavSync.
> 
> The locking algorithm of the FTS250 (and  maybe the FTS125 too) is a
> National LMX series PLL chip (I can't remember  the exact part number, have
> to check with the FTS250 COO we  have).
> 
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