[time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?

[Alan Kamrowski II]

Hi Guido,

A couple more questions about the RFTG if you have a moment:

What are you default values for Avg Sample, Time Corr Schedule, and Freq Corr Schedule.  Mine are 5, 15, 1440...

Also with yours up and running how often does it make adjustments?  Mine has been running for 82 hours and has made no time adjustments and the three frequency adjustments (every 24 hours) are for "0.0000e+000".  It would seem that it is pretty happy with where it is as all of my previous times were loaded with both time and frequency adjustments in an attempt to get itself set properly.  Perhaps it finally did.

I've attached a temperature sensor to the LPRO inside and am using a PID loop on an AVR to vary a fan rpm to keep the LPRO at a consistent temp.  It seems to be keeping it at +/- 0.2 deg C and I've not bothered to try to tune the PID at all yet.

Thanks,

Alan


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Guido Küppers
Sent: Friday, August 23, 2013 1:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?

Hi Alan,
I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since.
7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0.
Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date.
Have fun
Guido

Von Samsung Mobile gesendet

Alan Kamrowski II <alank2 at earthlink.net> hat geschrieben:

Hi Guido,

Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future?  If I send it today's date in the correct Motorola format, this is how many days it adds to it.  If I change the date to try another, it does the same thing.  Any idea why?  I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd.

Thanks,

Alan


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