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 providin
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 Heathe
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 assembly?
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 t
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 lo
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