[time-nuts] eBay Giveaway Vectron OCXOs

Pete Lancashire pete at petelancashire.com
Fri Dec 23 17:21:32 EST 2011


John,

If the one that failed is now dead, they are not all that hard to open
up. Component
failure analysis once was a job for me. I've not looked at my two
closely and they
are not in front of me, but I use to grind off the seam two ways, have
a can opener,
they actually make them for this purpose. If not and you have a model shop
start by using a belt sander to 'grind' down the lip, then I'd take
over with a die grinder
and a set of very fine files.

If you really want to gamble, and have a cheap pair of cutters you
dont mind abusing,
and if the can is not steel you can cut the lip off.

Either way, the edges will be VERY sharp, ...

-pete

On Fri, Dec 23, 2011 at 1:49 PM, jmfranke <jmfranke at cox.net> wrote:
> I tested a couple of the oscillators. The Reference Output Voltage does not
> plateau as the input voltage is increased. It does hit 3.00V for an input of
> 3.3V. It is at 4.5V when the input is 5v and keeps climbing well past 5V as
> the input voltage is raised. So, it appears to be a simple 0.9 times the
> input voltage. One unit failed at 12V. At 3.3V, the initial current drain is
> 0.45A for a net power of 1.48W and after a short time the current drops to
> 0.16A for a net power of 0.53W. Both numbers are well below the maximum
> ratings, but typical ratings are not given and the rapid drop between the
> two plateaus indicates the oven controller is working fine.
>
> So, my bet is placed on the devices being 3.3V.
>
> John  WA4WDL
> --------------------------------------------------
> From: "Peter Gottlieb" <nerd at verizon.net>
> Sent: Friday, December 23, 2011 2:57 PM
> To: <time-nuts at febo.com>
>
> Subject: Re: [time-nuts] eBay Giveaway Vectron OCXOs
>
>> A search of the Vectron site for OCO500 (which is on my unit) brings up a
>> datasheet which references that as a "replaced" unit.
>>
>> http://www.vectron.com/products/ocxo/c4550.pdf
>>
>> Shows there are 5, 12 and 3.3 volt options.  I don't see where 4.8 volts
>> is a reference output voltage, the closest is 5 volts with the 12 volt unit.
>>  I would put the unit on a variable bench supply and slowly raise the input
>> voltage to see where the reference stops increasing but I would hazard a
>> guess that it is a 12 volt unit.  If you increase the supply to 5.5 etc then
>> in that case you would see the reference stop increasing at 5.0.
>>
>> Peter
>>
>>
>>
>> On 12/23/2011 2:42 PM, Magnus Danielson wrote:
>>>
>>> On 12/23/2011 08:26 PM, SAIDJACK at aol.com wrote:
>>>>
>>>> Running it at 5V with a Ref out at 4.8V would seem too close. Maybe it's
>>>> a
>>>> 12V part?
>>>>
>>>> If nothing else this could be a very stable, ovenized 4.8V lab reference
>>>> source..
>>>>
>>>> Is anyone planning to monitor the aging/stability/noise of this
>>>> reference?
>>>
>>>
>>> My guess would be for 12 V, but 5V would be one to try.
>>>
>>> Measuring the frequency stability on 5V would be one thing to try.
>>>
>>> Cheers,
>>> Magnus
>>>
>>>> bye,
>>>> Said
>>>>
>>>>
>>>> In a message dated 12/23/2011 07:28:34 Pacific Standard Time,
>>>> danrae at verizon.net writes:
>>>>
>>>> Thanks  for all the responses.  A quick check before breakfast shows
>>>> that
>>>> mine would seem to be for 5 Volts since the power consumption at that
>>>> input agrees with the data sheet referenced; the current peaks at 0.95 A
>>>> warming up and 0.13 A warm.   Reference V out is 4.8  V.
>>>>
>>>> Dan
>>>>
>>>>
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>>>
>>>
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