Success!
I disassembled the oven and adjusted the OCXO frequency up about 5 Hz. Lady
Heather reported the DAC changed from +99.99% with no lock to -90% with lock to
GPS. Hopefully I did not increase the frequency too much. The long term
aging/drift direction has been down - which caused the
Thank you, Hal, for these links and to others for your comments.
Setting the oven temperature on a turning point appears tedious. Perhaps there
is enough range in the frequency adjustment to put the oscillator back on
frequency - or close enough for the EFC to be effective. If not, I may have
Mark,
When I press "D" Lady Heather replies:
Manual disciplining not supported by this receiverpress ESC
Questions about the Z3801A:
Does the oscillator have an adjustment? If so, is this somewhat accessible
without destroying the assembly? Are there pictures of the oscillator
My Z3801A failed about a year ago (there was a warning the electronic frequency
control was nearing a limit).
Symptoms (most from GPS Control and Lady Heather:
Frequency about 1E-8 low
Time Invalid (many hours off)
Date 6 months old
DAC 99.9969 percent
Life 72K Hours
Lady
Does anyone know the aging and temperature specifications of a Motorola T5829A
"Ultra High Stability Oscillator"?
This is a 5 MHz standard containing an OCXO. After a day of operation, the next
24 hour drift was 2.5E-9 lower, but change due to temperature variations is
unknown. A nearby HP-105B
Hi All,
I recently acquired an Erfatom (Datum) MFS-176 RVFS and GPS frequency and time
system. The system works, except the date shows September 9, 1996 (increases
daily). I can set the date and time during startup, but the displayed date
reverts to 1996 when the GPS system locks and is
