[time-nuts] symmetricom 58540A

[Don Latham]

Just got one of these that's showing a highly ambiguous error light.
I've been applying the commands available in the user manual to try to
pinpoint the trouble. As usual for these devices, the manual is
tantalizingly short of information.
For example: I've entered a date and location using the provided
commands, and recovered them. But an attempt to erase the eeprom and
check the erase gives error 221 prompt. I figured out that error 113
means "say what?" but can't find any error msg chart. The only reference
to error 221 has to do with a survey location. Are the date, location,
etc stored in eeprom, or is the eeprom bollixed?

Diagnostic probing indicates that the GPS rcvr is somehow not
functioning, both by no confidence in the time, no satellites tracking
(two different antennas), no pulse on the 1/2pps. The antenna voltage
measures 5v open circuit and dig returns normal current.
Synchronization state returns POWer up. Presuambly the GPS is simply not
responding.

So, I guess I'm asking for a guru reading. Is the EEPROM or the GPS
faulty? Does the GPS require a working EEPROM to function?

Thanks for any possible help...
Don



-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
De Erroribus Medicorum, R. Bacon, 13th century.
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com