[time-nuts] X72 and 1pps

Matthias Jelen Matthias.Jelen at gmx.de
Sun Mar 4 08:55:38 EST 2018

Hi Mark,

thanks for your reply.
> Try enabling the PPS input form the "P menu.
I can´t find this option - I can toggle the PPS output, but 
not the input.

BTW, what´s the "set TIC" option? I can enter a number here, 
but I can´t find something about this command in the manual...

&a Auto-Tune seems to work well - I see the plot stepping 
and a slope is calculated.

What´s the expected behaviour if I go to d-e: "Enable HW 
discipline" ? I can´t see any changes here.

I checked the SA.22.C manual as well, but this contains more 
or less the same information as the X72.


> Also, to verify that it is using the PPS input try the &a auto-tune command.  It will set the TIC  and DDS tune word to to 0, collect data for for however long you requested (an hour is a good start), then calculate the drift rate and set the DDS tune word to put the device on frequency.  The EE command should set save the DDS word in EEPROM.    If the unit is seeing the PPS input, you should see the PPS plot stepping as the DDS freq drifts.
> Many of the X72 settings cannot be read back from the unit.  Heather maintains a "software eeprom" with the settings that it knows about in the file "tbeeprom.dat".  Until you update a setting, what is displayed for that setting may not be correct.  Use the "P" menu to set each of the settings so that Heather can learn what they are.  When Heather starts up, it restores all the last settings from the file.
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