[time-nuts] Re: Isotemp OCXO question

[Bob kb8tq]

Hi

I’d bet that OCXO was made in the 48th week of 1990.

Bob

> On Aug 21, 2021, at 3:14 PM, Robert DiRosario <ka3zyx at comcast.net> wrote:
> 
> I found that very late the other night.  I don't think that's it because the
> physical construction is different.  I've attached some photos.  I think this
> Time Code Translator thing is very old, the device is made from 68 SSI LS
> TTL chips, wire wrapped!
> 
> I suspect this OCXO predates their website, and the internet.  I guess I
> just need to test it and see what it does.  I suspect the screw on the top
> covers a frequency adjustment resister or capacitor or something.
> 
> Robert
> 
> 
> On 08/20/2021 02:01 AM, Keelan Lightfoot wrote:
>> Internet Archive to the rescue!
>> 
>> https://web.archive.org/web/19990506093727/http://www.isotemp.com/ocxo59.htm
>> 
>> According to that page, the OCXO59 series is available in 5 MHz to 50
>> MHz... So a 1MHz version may have been an OEM version.
>> 
>> >From a later archive of their site, here's a PDF datasheet for a 50 MHz
>> OCXO59 series oscillator which includes a drawing for the 59 series with a
>> pinout:
>> 
>> http://www.isotemp.com/wp-content/uploads/2011/06/Legacy59-21.pdf
>> 
>> On Thu, Aug 19, 2021 at 3:56 PM Robert DiRosario <ka3zyx at comcast.net> wrote:
>> 
>>> I got a  Trak Systems "Time Code Translator" from ebay.  It's a 1U box
>>> with large LEDs for DOY and H/M/S that translates IRIG-A to NASA-36 time
>>> code.  I plan on using the case for my WWVB clock.
>>> 
>>> Unexpectedly it has an Isotemp OCXO in it, model OCXO59-11-2, frequency
>>> marked as 1.000 MHz  The Isotemp website is more or less dead, it has no
>>> information on it.  Does anyone have any information on this model, like
>>> how accurate it is?  It has only three wires, which I assume are power,
>>> ground and output, with no EFC input.
>>> 
>>> One thing that I'm sill note sure about is what to do when the receiver
>>> is not receiving WWVB.  I was thinking of using something like the
>>> DS3231 RTC module.  If this OCXO is better, I may use it.
>>> 
>>> Thanks
>>> 
>>> Robert
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