[time-nuts] Nav Receiver Sawtooth Correction?
bob at evoria.net
Sun Mar 23 21:30:55 EDT 2014
Thanks for the response. I've got a UT+ in the parts box. But that's not the problem I'm trying to solve. I'm trying to make the best GPSDO that I can make using a nav receiver at the moment. Call it an obsession if you like. It's OK if I don't have corrections to the nanosecond for each PPS. But I can see the nav receiver wandering around; especially on cloudy days, (the antenna is in the attic, so that's about the best I can do for that) and it just seems to me that I should be able to do a general correction for nav position errors. Sorry if my naive posts are starting to get on people's nerves.
> From: EB4APL <eb4apl at cembreros.jazztel.es>
>To: time-nuts at febo.com
>Sent: Sunday, March 23, 2014 7:35 PM
>Subject: Re: [time-nuts] Nav Receiver Sawtooth Correction?
>The sawtooth is generated by the granularity of the GPS receiver clock
>not being synchronous with the recovered PPS. The receiver program can
>calculate the correction to be applied to the next PPS and outputs it in
>a message, bu only in timing receivers, this is not a useful thing in
>navigation receivers and I think that it cannot be calculated using the
>satellites' position, it is a receiver "defect".
>Why don't you buy a timing receiver? An used Motorola Encore M12+
>timing receiver can be bought by $35 or less (ebay items 290656401551 or
>301131583613. The seller is a known Time Nuts supplier). An UT+ or GT+
>even for quite less.
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