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

[Bob kb8tq]

Hi

Yet again another quick read mistake :)

Bobb

> On May 23, 2017, at 7:35 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
> 
> 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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