[time-nuts] Piezo Company OXCO pinouts (William Rice)

[Steve Rooke]

Hi Richard,

It is always wise to be cautious when dealing with an expensive item
that could easily be fried by too much voltage and I think you took
the correct approach. I found that my oxco seemed to work fine at 12V
but, as it has been pointed out, it would probably take a lot longer
to reach working temperature and may not be able to maintain that in a
cold environment. I've been running mine at 24V for well over a day
now and it seems to be working fine so I guess it's OK to keep it on
that supply. I guess the case on my unit was slightly hotter under 24V
due to the power supply dissipation and I wonder what bearing that
makes to the overall heating of the oven. I will try to see if I can
get some proper test results of the case temperature than my touch
test.

2008/10/2 Richard H McCorkle <mccorkle at ptialaska.net>:
> Hi Steve,
>
> Not knowing the rated voltage of the unit I took the overly cautious
> approach of slowly increasing the supply voltage until the frequency
> first stabilized when varying the voltage over a small range. The unit
> stabilized at approximately 10.8v (12v - 10%) so I specified 12v as
> the lower limit of the input voltage required. The internal regulator
> will run cooler and the oven will draw more current and take longer
> to stabilize at the low end of the usable voltage range.
>  I didn't test for the maximum voltage as this could turn into a
> destructive test if not done properly. I would suspect the internal
> regulator can handle input voltages greater than 26.4v (24v + 10%)
> safely so the unit could be specified at 24v +/- 10% in the Lucent
> application it was designed for. The higher voltage would speed oven
> response to changing temperature and reduce the warm-up time.
>
> Regards,
> Richard
>
>
>> Hi Richard,
>>
>> Many thanks for the info, this was most helpful and I have the unit
>> running fine now. The only real difference is that my unit seems to be
>> labelled to run off 24V and the data sheet shows 12V. My serial number
>> is 2331 (9439) which is not listed on the pdf you sent. After the
>> initial panic over running it off 24V for some hours to test it, I
>> have tried it on 12V and it still seems to work fine. The difference
>> is that the frequency has dropped about .5ppm and the case feels
>> cooler to the touch. Now I don't know what the power voltage should be
>> as someone else on the list mentioned the nominal is 25.5V. Let's have
>> a vote :)
>>
>> Thanks for your help.
>>
>> Regards,
>> Steve
>>
>> 2008/9/30 Richard H McCorkle <mccorkle at ptialaska.net>:
>>> Hello,
>>>
>>> I purchased three Piezo 2920136 units and the attached file documents
>>> what the pinouts and EFC requirements are. Hope you find this useful.
>>>
>>> Richard
>>>
>>>
>>>> Just new to this list and found this post while trawling the net for
>>>> the same info. This is a manual reply to a previous posting so the
>>>> message ids won't tally, sorry.
>>>>
>>>> --- William Rice wrote:-
>>>>> Have a surplus Piezo Crystal Co. oscillator. 3x2x2" with 6 pins on bottom, no
>>>>> RF
>>>>> connector.
>>>>> Model# 2920136 / 10.000 Mhz (101728-001)
>>>>> Had trouble finding info.... Maybe standard configuration, 9337 stamped on
>>>>> unit,
>>>>> probably just obsolete.
>>>>> Any help appreciated.
>>>>> Did find one on ebay, my unit is not as abused.
>>>>> Do not know if it needs external control.
>>>>
>>>>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160286114515
>>>>
>>>> I have a Piezo Model 2920136 10MHz oscillator which seems to be the
>>>> same as in your url link above. The info I have to date for the six
>>>> pins from left to right:-
>>>>
>>>> Out, GND, +24V, ?, Vcc, GND
>>>>
>>>> I don't know what the 4th (?) pin does and I also have know idea as to
>>>> what voltage needs to be connected to the Vcc pin. Any help please?
>>>>
>>>> Thanks,
>>>> Steve
>>>> --
>>>> Steve Rooke - ZL3TUV & G8KVD
>>>> Omnium finis imminet
>>>>
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>>>
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>>
>>
>>
>> --
>> Steve Rooke - ZL3TUV & G8KVD
>> Omnium finis imminet
>>
>
>
>
>
>
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-- 
Steve Rooke - ZL3TUV & G8KVD
Omnium finis imminet