[time-nuts] Opening an Isotemp OCXO

Peter Reilley preilley_454 at comcast.net
Fri Oct 28 15:07:36 EDT 2016

There is no regulator chip in the unit.   I am thinking that this must
be a 5 volt unit.


On 10/28/2016 12:42 PM, Dan Rae wrote:
> On 10/28/2016 9:09 AM, Peter Reilley wrote:
>> The only document that I could find said 12 volt.
>> Pete.
> The 82 series came in a lot of flavors.  I have one 82-49 which is 
> definitely 12V ( draws 0.12A when warm and maybe 0.3 when cold) and 
> has a 5V pp square wave output at 10 MHz.  It also has a Vref output 
> and an EFC input.  What is odd about this one is that it came to me 
> from a TRW swap meet scrap dealer who bought stuff from Cubic 
> Communications in San Diego and it had a "Reject" tag from them. 
> Probably because it was supposed to be a 5 MHz unit as marked, so 
> presumably had the wrong crystal fitted by Isotemp. Other versions of 
> the 82 series (-10) were fitted to Racal Receivers like the 
> RA6790/GM.  Screw adjustment on the side and 5 MHz output.
> Are you sure yours shouldn't have a 5V supply on that output IC? Could 
> be why it died if there is an internal regulator that failed putting 
> the full supply voltage on the IC?
> Dan

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