Empathy List Archives

MS

Mark Sims

Wed, Nov 15, 2017 3:39 AM

The M12 uses different commands for sending a lot of the data since it is tracking more sats and the old commands were limited to 6 or 8 sats. I doubt it would work the the RFTG. There might also be a 3V vs 5V problem.

TS

Tim Shoppa

Wed, Nov 15, 2017 3:52 AM

Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO?

Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren’t then they’re irrelevant).

Tim

On Nov 14, 2017, at 10:39 PM, Mark Sims holrum@hotmail.com wrote:

The M12 uses different commands for sending a lot of the data since it is tracking more sats and the old commands were limited to 6 or 8 sats. I doubt it would work the the RFTG. There might also be a 3V vs 5V problem.

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Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO? Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren’t then they’re irrelevant). Tim > On Nov 14, 2017, at 10:39 PM, Mark Sims <holrum@hotmail.com> wrote: > > The M12 uses different commands for sending a lot of the data since it is tracking more sats and the old commands were limited to 6 or 8 sats. I doubt it would work the the RFTG. There might also be a 3V vs 5V problem. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

JH

Jerry Hancock

Wed, Nov 15, 2017 4:29 AM

I can’t find the instructions on how to make the REF1 work without the REF0. Other than adding the 10Mhz, do I have to do anything to it to enable it to run without the REF0?

On Nov 14, 2017, at 7:52 PM, Tim Shoppa tshoppa@gmail.com wrote:

Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO?

Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren’t then they’re irrelevant).

Tim

On Nov 14, 2017, at 10:39 PM, Mark Sims holrum@hotmail.com wrote:

The M12 uses different commands for sending a lot of the data since it is tracking more sats and the old commands were limited to 6 or 8 sats. I doubt it would work the the RFTG. There might also be a 3V vs 5V problem.

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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

I can’t find the instructions on how to make the REF1 work without the REF0. Other than adding the 10Mhz, do I have to do anything to it to enable it to run without the REF0? > On Nov 14, 2017, at 7:52 PM, Tim Shoppa <tshoppa@gmail.com> wrote: > > Isn’t info about what satellites are where, just eye candy and irrelevant to a real GPSDO? > > Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren’t then they’re irrelevant). > > Tim > >> On Nov 14, 2017, at 10:39 PM, Mark Sims <holrum@hotmail.com> wrote: >> >> The M12 uses different commands for sending a lot of the data since it is tracking more sats and the old commands were limited to 6 or 8 sats. I doubt it would work the the RFTG. There might also be a 3V vs 5V problem. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

BH

Bill Hawkins

Wed, Nov 15, 2017 5:38 AM

It's been a few years since I looked at this, but it seems to me that
the message from the receiver to the time processors included an
estimate of the reliability of the satellite data. That estimate depends
on satellites being in the predicted positions. If there is an error,
the time data is marked as invalid.

The old messages had 6 satellites, and the newer messages had 8. The
messages were identical, except that the newer message reported 2 more
satellites. An older time processor would not have been able to handle
the new 8 sat message. So, no, you can't mix old and new RFTG modules.

If this sounds like I know what I'm saying, you may be disappointed.

Bill Hawkins

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Tim
Shoppa
Sent: Tuesday, November 14, 2017 9:53 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable

Isn't info about what satellites are where, just eye candy and
irrelevant to a real GPSDO?

Tweaks to the elevation mask ought to be measurable in the PPS quality
(if they aren't then they're irrelevant).

Tim

It's been a few years since I looked at this, but it seems to me that the message from the receiver to the time processors included an estimate of the reliability of the satellite data. That estimate depends on satellites being in the predicted positions. If there is an error, the time data is marked as invalid. The old messages had 6 satellites, and the newer messages had 8. The messages were identical, except that the newer message reported 2 more satellites. An older time processor would not have been able to handle the new 8 sat message. So, no, you can't mix old and new RFTG modules. If this sounds like I know what I'm saying, you may be disappointed. Bill Hawkins -----Original Message----- From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Tim Shoppa Sent: Tuesday, November 14, 2017 9:53 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lucent RFTG-u REF0-REF1 cable Isn't info about what satellites are where, just eye candy and irrelevant to a real GPSDO? Tweaks to the elevation mask ought to be measurable in the PPS quality (if they aren't then they're irrelevant). Tim

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Lucent RFTG-u REF0-REF1 cable