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 <kb...@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 <aa...@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.i...@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 <kb...@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 <aa...@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 > >>>> > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >> mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.