[time-nuts] Z3805 service information ?

[Bob Benward]

Hi Mark,
I suspected my GPS was trashed after the storm as well.  So I swapped the
GPS model between my Z3801A and Z3805A.  I monitored both at the same time
and both eventually got GPS locks.  My antennae are not optimally placed so
that may be why it takes so long.  So much for that idea.  As I said before
in my case it the ocxo running out of EFC range.  Did you check the supply
voltages via the test points?


Bob

P.S. Something I learned about the Z38xx program:  If you need to run two
copies on the same computer, simply place then in different folders.  The
data and init folders remain within the folders allowing you to run two
different Z38xx machines on different com ports.

>>> -----Original Message-----
>>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Mark
>>> Spencer
>>> Sent: Tuesday, September 08, 2015 4:41 PM
>>> To: Discussion of precise time and frequency measurement
>>> Subject: Re: [time-nuts] Z3805 service information ?
>>> 
>>> Hi it seems the GPS module is not working and I suspect the power supply
is
>>> failing.   After a few power cycles the unit started up and reported via
rs232
>>> that it could not communicate with the GPS receiver
>>> 
>>> The docxo still delivers great performance from an adev perspective and
I
>>> have other gpsdo's so I'm going to defer any more work on this for the
time
>>> being.  The docxo is probably the most valuable part right now.  It is
far and
>>> away better than any of my other 10811's from an adev perspective.
>>> 
>>> Right now I'm kind of glad no one bought my jackson labs fury GPSDO.
>>> 
>>> 
>>> I figure I got my money's worth from the Z3805 and my interest in time
nuts
>>> pursuits has waned in recent years.
>>> 
>>> Also I seem to recall this Z3805 loosing GPS lock during a lightning
storm as
>>> well.  (I recall some one else mentioned this issue with their Z3805.)
>>> 
>>> 
>>> Sent from my iPhone
>>> 
>>> > On Sep 1, 2015, at 9:05 PM, Bob Benward <rbenward at verizon.net> wrote:
>>> >
>>> > Can you communicate over RS232?  Are you using the Z38xx software?
>>> > What does it say?
>>> >
>>> > Bob
>>> >
>>> >>>> -----Original Message-----
>>> >>>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of
>>> >>>> Mark Spencer
>>> >>>> Sent: Tuesday, September 01, 2015 12:54 PM
>>> >>>> To: time-nuts at febo.com
>>> >>>> Subject: [time-nuts] Z3805 service information ?
>>> >>>>
>>> >>>> Hi, I realize this is a long shot but I'm curious if anyone has
>>> >>>> ever
>>> > come across
>>> >>>> any form of a service manual (or insight into a power on self test
>>> > routine) for
>>> >>>> the Z3805 gpsdo ?
>>> >>>>
>>> >>>> One of mine is not working properly after being power cycled.   It
works
>>> > well
>>> >>>> enough to blink the status lights on the front panel hence my
>>> >>>> request
>>> > for info
>>> >>>> about a possible power on self test routine.
>>> >>>>
>>> >>>> I'll likely start by confirming the power supply voltages using
>>> >>>> another
>>> > working
>>> >>>> unit as a guide and then swap parts with another working unit but
>>> > thought I
>>> >>>> would look for service information first.
>>> >>>>
>>> >>>> Thanks in advance for any help.
>>> >>>>
>>> >>>> With the exception of two ocxo's that have a dedicated battery
>>> >>>> backup system all my time nuts gear, computers, freezers, etc was
>>> >>>> power cycled during a two day power outage after a wind storm while
>>> >>>> I was on
>>> > vacation.   I
>>> >>>> have a nice generator that sat un used in my garage (:
>>> >>>>
>>> >>>> Mark Spencer
>>> >>>> VE7AFZ
>>> >>>>
>>> >>>> _______________________________________________
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>>> >
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