[time-nuts] Looking for info on Trimble 16634-10

[Tim Shoppa]

Bob, that was 16.368MHz, an extremely common crystal to find in the first
couple generations of GPS receivers. 16.368 MHz is 16 times the 1.023 MHz
C/A GPS signal chipping rate; multiplied by 96.25 to get the 1575.42 MHz L1
frequency and multiplied by 75 to get the 1227.60 MHz L2 frequency.

Tim N3QE

On Tue, May 23, 2017 at 7:24 AM, Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> If you guess that the design started in 90 and ran through 93~94 that
> is a very early unit for Trimble. 16.384 MHz suggests some sort of telecom
> or data bus application.
>
> Bob
>
> > On May 22, 2017, at 11:48 AM, Scott Armstrong <aa5am at vntx.net> wrote:
> >
> > Hi Guys,
> >
> > I popped open the case.  Not too crowded in side. The case is an extruded
> > aluminum case that has the back endplate  welded on.
> >
> > There are 4 board assemblies in the case.
> >
> > *Interface board that connects the 22 pin connector to the other two
> boards.
> > * Power supply board. (12016-00). Main component looks to be a DC-DC
> > converter made by Computer Products.
> > * Main board (14636-)  This board has a 16.368 MHz osc made by NDK.
> > * A daughter board (14789E) which is the receiver and is attached to the
> > main board.
> >
> > Date codes I see are 89, 91, 92 and 93  so unit was probably assembled in
> > '93.
> >
> > Maybe some of the assembly numbers will be recognizable if they are used
> in
> > other units.
> >
> > Thanks,
> > Scott AA5AM
> >
> >
> > On Sat, May 20, 2017 at 12:33 AM, Bill Hawkins <bill.iaxs at pobox.com>
> wrote:
> >
> >> FWIW, that looks like aviation equipment (gov't or civil), with a
> >> locking connector.
> >>
> >> That stuff is designed for minimum size and weight. You might find the
> >> inside of the box quite cramped.
> >>
> >> Buying aviation parts is even more expensive than buying boat parts.
> >>
> >> Bill Hawkins
> >>
> >>
> >> -----Original Message-----
> >> From: time-nuts on behalf Of Bob Bownes
> >> Sent: Friday, May 19, 2017 10:48 PM
> >>
> >> Pretty sure that connector is an off the shelf Amphenol part. If you
> >> can't find it, however, you can replace it with an off the shelf one
> >> that will fit in the same hole. (If your lucky, you can even re-use the
> >> pins.)
> >>
> >> The replacement will run you about $30-40 for the pair, chassis and
> >> plug. Check Mouser, etc.
> >>
> >>> On May 19, 2017, at 23:21, Bob kb8tq <kb8tq at n1k.org> wrote:
> >>>
> >>> The mating side of that 22 pin connector isn't going to be cheap. It
> >>> looks like something out of their government systems group back in the
> >> late 90's. If it is, you may have a hard time getting info on it.
> >>> I'd pop it open and see what's inside. At least that will give you an
> >>> idea if it's 20 years old or 5 years old. Knowing the era should help
> >> in the search for information.
> >>>
> >>> Bob
> >>>
> >>>> On May 19, 2017, at 10:21 PM, Scott Armstrong <aa5am at vntx.net> wrote:
> >>>>
> >>>> I acquired a Trimble 16634-10 receiver. A search of the web has
> >>>> turned up nothing so far.
> >>>> The unit is in a steel box built like a tank. SMA connector for
> >>>> antenna input and a 22 pin circular connector for the I/O and power
> >>>>
> >>
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