Empathy List Archives

MM

Mike Millen

Wed, Dec 21, 2016 7:29 PM

Can anyone comment on the following data, and whether they think the

oscillator in "my" M8N is a XO or a TCXO ?

Can you monitor the current draw from cold (ambient)?

You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the right temp?

If there's no change at all in average current as it warms then it may
not have a TCXO.

Mike

>>>> Can anyone comment on the following data, and whether they think the >>>> oscillator in "my" M8N is a XO or a TCXO ? Can you monitor the current draw from cold (ambient)? You may be able to identify the initial steady current drawn by the TCXO heater, then the cycling once it's hit the right temp? If there's no change at all in average current as it warms then it may not have a TCXO. Mike

E

EB4APL

Thu, Dec 22, 2016 1:58 PM

TCXO is not an OCXO, they don't have an oven. They compensate the
temperature induced drift using a temperature sensor, a microcontroller
and a table or parameter set for adjusting the output frequency. BTW,
for some applications they are unsuitable as they adjust the frequency
in steps.

Regards,

Ignacio EB4APL

El 21/12/2016 a las 20:29, Mike Millen escribió:

Can anyone comment on the following data, and whether they think the

oscillator in "my" M8N is a XO or a TCXO ?

Can you monitor the current draw from cold (ambient)?

You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the right temp?

If there's no change at all in average current as it warms then it may
not have a TCXO.

Mike

TCXO is not an OCXO, they don't have an oven. They compensate the temperature induced drift using a temperature sensor, a microcontroller and a table or parameter set for adjusting the output frequency. BTW, for some applications they are unsuitable as they adjust the frequency in steps. Regards, Ignacio EB4APL El 21/12/2016 a las 20:29, Mike Millen escribió: > > >>>> Can anyone comment on the following data, and whether they think the > >>>>> oscillator in "my" M8N is a XO or a TCXO ? > > > Can you monitor the current draw from cold (ambient)? > > You may be able to identify the initial steady current drawn by the TCXO > heater, then the cycling once it's hit the right temp? > > If there's no change at all in average current as it warms then it may > not have a TCXO. > > Mike

DJ

Didier Juges

Thu, Dec 22, 2016 2:07 PM

TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater), as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven.
I would not expect a TCXO to become warm or draw more current at power up. An OCXO would.

Didier KO4BB

On December 21, 2016 1:29:00 PM CST, Mike Millen mike.millen.uk@gmail.com wrote:

Can anyone comment on the following data, and whether they think

the

oscillator in "my" M8N is a XO or a TCXO ?

Can you monitor the current draw from cold (ambient)?

You may be able to identify the initial steady current drawn by the
TCXO
heater, then the cycling once it's hit the right temp?

If there's no change at all in average current as it warms then it may
not have a TCXO.

Mike

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TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater), as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven. I would not expect a TCXO to become warm or draw more current at power up. An OCXO would. Didier KO4BB On December 21, 2016 1:29:00 PM CST, Mike Millen <mike.millen.uk@gmail.com> wrote: > >>>>> Can anyone comment on the following data, and whether they think >the > >>>>> oscillator in "my" M8N is a XO or a TCXO ? > > >Can you monitor the current draw from cold (ambient)? > >You may be able to identify the initial steady current drawn by the >TCXO >heater, then the cycling once it's hit the right temp? > >If there's no change at all in average current as it warms then it may >not have a TCXO. > >Mike > > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. -- Sent from my Moto-X wireless tracker while I do other things.

D

David

Thu, Dec 22, 2016 4:04 PM

On Wed, 21 Dec 2016 19:29:00 +0000, you wrote:

Can anyone comment on the following data, and whether they think the
oscillator in "my" M8N is a XO or a TCXO ?

Can you monitor the current draw from cold (ambient)?

You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the right temp?

If there's no change at all in average current as it warms then it may
not have a TCXO.

Mike

What heater? The big advantage of a TCXO (temperature compensated)
over an OCXO (oven controlled) is the lack of a heater allows low
power operation.

On Wed, 21 Dec 2016 19:29:00 +0000, you wrote: >>>>> Can anyone comment on the following data, and whether they think the >>>>> oscillator in "my" M8N is a XO or a TCXO ? > >Can you monitor the current draw from cold (ambient)? > >You may be able to identify the initial steady current drawn by the TCXO >heater, then the cycling once it's hit the right temp? > >If there's no change at all in average current as it warms then it may >not have a TCXO. > >Mike What heater? The big advantage of a TCXO (temperature compensated) over an OCXO (oven controlled) is the lack of a heater allows low power operation.

MM

Mike Millen

Thu, Dec 22, 2016 5:42 PM

On 22/12/2016 16:04, David wrote:

On Wed, 21 Dec 2016 19:29:00 +0000, you wrote:

You may be able to identify the initial steady current drawn by the TCXO
heater, then the cycling once it's hit the right temp?

If there's no change at all in average current as it warms then it may
not have a TCXO.

Mike

What heater? The big advantage of a TCXO (temperature compensated)
over an OCXO (oven controlled) is the lack of a heater allows low
power operation.

My mistake... you're quite right.

Brain-fade, I'm afraid.

Mike

On 22/12/2016 16:04, David wrote: > On Wed, 21 Dec 2016 19:29:00 +0000, you wrote: > >>>>>> You may be able to identify the initial steady current drawn by the TCXO >>>>>> heater, then the cycling once it's hit the right temp? >>>>>> >>>>>> If there's no change at all in average current as it warms then it may >>>>>> not have a TCXO. >>>>>> >>>>>> Mike > What heater? The big advantage of a TCXO (temperature compensated) > over an OCXO (oven controlled) is the lack of a heater allows low > power operation. > My mistake... you're quite right. Brain-fade, I'm afraid. Mike

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Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?