[time-nuts] worth salvaging ?

paul swed paulswedb at gmail.com
Fri Jan 28 18:49:48 UTC 2011


Peter if moisture seeped in over the years it will erode the traces and in
general lower the sens. of the preamp/downconverter. Thats what I have seen
before.
Results with lower sens. is what you describe as the long lock up
potentially. I think the systems can get the almanac with only one
satellite. It seems that way to me at least.
Granted other thing could also create the same types of issues.
Looking forward to your pixs and just realized I could download them so I
can scan arround. That falls under the Dooooohhhh approach to
troubleshooting.
Regards
Paul.

On Fri, Jan 28, 2011 at 12:51 PM, Pete Lancashire
<pete at petelancashire.com>wrote:

> not in any way a scientific test
>
> three antennas could 'see' sats after about 2 minutes. One can tell in
> that one of the display options is to show sat number and state.
>
> one antenna after about 10-15 minutes the sats one at a time would go
> into a track mode,
> then after another 5 minutes would finally go into lock. I don't know
> where from track to lock
> when the almanac gets updated. I know it is in that the button cells
> died years ago.
>
> Somewhere I may have a box of unused antenna/downconvers
>
> tomorrow I'll gut one of the bad antenna/downcoverters and take a few
> pictures
>
> antenna/downverter with plastic cover removed
>
>
> https://docs.google.com/leaf?id=0B86wM5n5RE3kOWY5MDRiNGItZjc4My00MjBhLTlkNWYtNWE3NmI0NDQ0NTgz&hl=en
>
> circuit board
>
>
> https://docs.google.com/leaf?id=0B86wM5n5RE3kZDgyODNjNzMtZjYzYy00NTVmLThjNTgtZGUxNjMzMjcwOWE1&hl=en
>
> why I want to save the LED's
>
> http://www.youtube.com/watch?v=bXMUNUmIb5I
>
>
> On Thu, Jan 27, 2011 at 5:27 PM, paul swed <paulswedb at gmail.com> wrote:
> > Peter a couple of comments.
> > Great pictures you can really see the technology and if the net
> connection
> > wasn't so slow I would look at the eprom dates and such.
> > I know Odetics, the company well. I think they are long gone or the
> > goverment div survived so that suggests these are circa 1990-1994.
> > I have been working with another time-nut to recover austron 2201a
> > GPS receivers and unfortunately I seem to have come to the conclusion
> that
> > we can not get the almanacs to update and will guess this would be the
> same
> > issue with these potentially. But the odetics does look a bit newer.
> >
> > Drawing on the Austron I home brewed a down converter and that allowed me
> to
> > at least discover various information. So the fact that you have one
> working
> > a great step.
> > I suspect however the OCXO may not be all that exciting as time-nuttery
> > goes.
> >
> > On the down converters granted 10 are dead. But any details on the
> > internals??
> > Regards
> > Paul
> > WB8TSL
> >
> > On Thu, Jan 27, 2011 at 7:35 PM, Chris Albertson
> > <albertson.chris at gmail.com>wrote:
> >
> >> On Thu, Jan 27, 2011 at 3:54 PM, Pete Lancashire
> >> <pete at petelancashire.com> wrote:
> >>
> >> >
> >> > I'd like the lists opinion if saving the OCXO is worth puling of the
> >> board
> >>
> >> You mean is the OCXO worth your time to salvage it?  I don't know but
> >> from those photos I see 100 parts that are worth my time to salvage.
> >> I look at those photos and see a goldmine of parts.   I'd even salvage
> >> the little bead inductors and dip swiches
> >>
> >> The trick is not to worry at all about "collateral damage" on gear
> >> that is headed to the dumpster.  If you think that way then salvage
> >> takes very little time.
> >>
> >>
> >> --
> >> =====
> >> Chris Albertson
> >> Redondo Beach, California
> >>
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