KL
Keelan Lightfoot
Fri, Jun 23, 2023 3:31 PM
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
- Keelan
DG
David G. McGaw
Fri, Jun 23, 2023 6:01 PM
Yes, that is normal. I have one and the case runs about 46C. If it is
on-frequency, it is fine.
David N1HAC
On 6/23/23 11:31 AM, Keelan Lightfoot via time-nuts wrote:
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Yes, that is normal. I have one and the case runs about 46C. If it is
on-frequency, it is fine.
David N1HAC
On 6/23/23 11:31 AM, Keelan Lightfoot via time-nuts wrote:
> I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
> so. It holds at 50°, so it doesn't appear to be in any kind of runaway
> condition, and the UCCM works fine and achieves full lock. But is this
> temperature normal?
>
> I only own two other things with OCXOs in them, and they barely get warm to
> the touch, but they're larger units and decades older than the UCCM, so my
> sample size for what a modern-ish compact OCXO should feel like is quite
> limited.
>
> - Keelan
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
DR
Dan Rae
Fri, Jun 23, 2023 6:26 PM
On 6/23/2023 8:31 AM, Keelan Lightfoot via time-nuts wrote:
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I just happened to have the lid of one mine and it reads 47.5ºC and has
been happy for maybe three years so I'd say, yes it is...
Dan
On 6/23/2023 8:31 AM, Keelan Lightfoot via time-nuts wrote:
> I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
> so. It holds at 50°, so it doesn't appear to be in any kind of runaway
> condition, and the UCCM works fine and achieves full lock. But is this
> temperature normal?
I just happened to have the lid of one mine and it reads 47.5ºC and has
been happy for maybe three years so I'd say, yes it is...
Dan
BC
Bob Camp
Fri, Jun 23, 2023 6:32 PM
Hi
If it works and locks up, I would not worry about it. There’s not much you can
do to “repair” the OCXO. The only choice would be to replace it. Replacing one
that still works sounds like more trouble than it’s worth.
Bob
On Jun 23, 2023, at 11:31 AM, Keelan Lightfoot via time-nuts time-nuts@lists.febo.com wrote:
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Hi
If it works and locks up, I would not worry about it. There’s not much you can
do to “repair” the OCXO. The only choice would be to replace it. Replacing one
that still works sounds like more trouble than it’s worth.
Bob
> On Jun 23, 2023, at 11:31 AM, Keelan Lightfoot via time-nuts <time-nuts@lists.febo.com> wrote:
>
> I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
> so. It holds at 50°, so it doesn't appear to be in any kind of runaway
> condition, and the UCCM works fine and achieves full lock. But is this
> temperature normal?
>
> I only own two other things with OCXOs in them, and they barely get warm to
> the touch, but they're larger units and decades older than the UCCM, so my
> sample size for what a modern-ish compact OCXO should feel like is quite
> limited.
>
> - Keelan
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
A
Askild
Fri, Jun 23, 2023 7:09 PM
Hi Keelan,
It's not unusual for OCXO's too have an internal temperature of 80ºC, and
even higher. So the amount of insulation affects the external temperature
of the OCXO.
So 50ºC should be perfectly fine.
Regards,
Askild
On Fri, 23 Jun 2023, 19:40 Keelan Lightfoot via time-nuts, <
time-nuts@lists.febo.com> wrote:
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Hi Keelan,
It's not unusual for OCXO's too have an internal temperature of 80ºC, and
even higher. So the amount of insulation affects the external temperature
of the OCXO.
So 50ºC should be perfectly fine.
Regards,
Askild
On Fri, 23 Jun 2023, 19:40 Keelan Lightfoot via time-nuts, <
time-nuts@lists.febo.com> wrote:
> I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
> so. It holds at 50°, so it doesn't appear to be in any kind of runaway
> condition, and the UCCM works fine and achieves full lock. But is this
> temperature normal?
>
> I only own two other things with OCXOs in them, and they barely get warm to
> the touch, but they're larger units and decades older than the UCCM, so my
> sample size for what a modern-ish compact OCXO should feel like is quite
> limited.
>
> - Keelan
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
BC
Bob Camp
Fri, Jun 23, 2023 10:51 PM
Hi
Any time you measure a surface temperature, the “rest of the environment”
matters quite a bit. Check it in a room at 30 C you get a different answer than
25C. Have a very modest amount of air flow ( = you can barely feel it) and
you get yet a different answer.
The OCXO is likely rated to 70 or 85 C (who knows which one. Having an internal
temperature 20 to 30C above that would not be out of the question.
You have maybe 4 mm of insulation between the oven and the case. That’s not
a lot ……
Bob
On Jun 23, 2023, at 3:09 PM, Askild via time-nuts time-nuts@lists.febo.com wrote:
Hi Keelan,
It's not unusual for OCXO's too have an internal temperature of 80ºC, and
even higher. So the amount of insulation affects the external temperature
of the OCXO.
So 50ºC should be perfectly fine.
Regards,
Askild
On Fri, 23 Jun 2023, 19:40 Keelan Lightfoot via time-nuts, <
time-nuts@lists.febo.com> wrote:
I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
so. It holds at 50°, so it doesn't appear to be in any kind of runaway
condition, and the UCCM works fine and achieves full lock. But is this
temperature normal?
I only own two other things with OCXOs in them, and they barely get warm to
the touch, but they're larger units and decades older than the UCCM, so my
sample size for what a modern-ish compact OCXO should feel like is quite
limited.
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com
Hi
Any time you measure a surface temperature, the “rest of the environment”
matters quite a bit. Check it in a room at 30 C you get a different answer than
25C. Have a very modest amount of air flow ( = you can barely feel it) and
you get yet a different answer.
The OCXO is likely rated to 70 or 85 C (who knows which one. Having an internal
temperature 20 to 30C above that would not be out of the question.
You have *maybe* 4 mm of insulation between the oven and the case. That’s not
a lot ……
Bob
> On Jun 23, 2023, at 3:09 PM, Askild via time-nuts <time-nuts@lists.febo.com> wrote:
>
> Hi Keelan,
>
> It's not unusual for OCXO's too have an internal temperature of 80ºC, and
> even higher. So the amount of insulation affects the external temperature
> of the OCXO.
> So 50ºC should be perfectly fine.
>
> Regards,
> Askild
>
>
> On Fri, 23 Jun 2023, 19:40 Keelan Lightfoot via time-nuts, <
> time-nuts@lists.febo.com> wrote:
>
>> I just received a Trimble UCCM module, and the OCXO gets quite hot, 50ºC or
>> so. It holds at 50°, so it doesn't appear to be in any kind of runaway
>> condition, and the UCCM works fine and achieves full lock. But is this
>> temperature normal?
>>
>> I only own two other things with OCXOs in them, and they barely get warm to
>> the touch, but they're larger units and decades older than the UCCM, so my
>> sample size for what a modern-ish compact OCXO should feel like is quite
>> limited.
>>
>> - Keelan
>> _______________________________________________
>> time-nuts mailing list -- time-nuts@lists.febo.com
>> To unsubscribe send an email to time-nuts-leave@lists.febo.com
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe send an email to time-nuts-leave@lists.febo.com
