[time-nuts] Z3801A OCXO manual trimming
nova at npgcable.com
Sun Mar 4 13:13:06 EST 2018
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 Heather shows the following as OK:
ROM, RAM, OSC GPS, Power, EEPROM, Antenna, Discipline, 5 satellites
GPS Con shows the following:
No time display
Only the front panel power light is lit.
This suggests either the crystal has aged or the heater temperature has drifted
slightly. I hear/read that opening the oscillator is difficult. Is there a
What have others done to restore operation? Is it time to consider a different
time & frequency standard?
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