Is TCXO really good for re-clock??

[tube-lover]

Dear all,

I need to order some TCXO for my 1541a RE-clock kit.

Can anyone told me that TCXO really good in re-clock circuit because its more expensive than standard 30ppm oscillator.

The best TCXO was less than <1ppm.

If I choose <2ppm or <5ppm TCXO will cheaper.

anyone can give me some opinions.

thx

thomas

[Guido Tent]

Originally posted by tube-lover
Dear all,

I need to order some TCXO for my 1541a RE-clock kit.

Can anyone told me that TCXO really good in re-clock circuit because its more expensive than standard 30ppm oscillator.

The best TCXO was less than <1ppm.

If I choose <2ppm or <5ppm TCXO will cheaper.

anyone can give me some opinions.

thx

thomas

Hi,

The ppm level is not relevant as long as it is within the redbook specification (+/- 100pm).

You should look for the jitter specification.

best regards

[tube-lover]

Dear Guido Tent,

very thanks for your advise. I try to ask the factory already. But they only produce very high precision standard TCXO, XO in very low ppm. Very low ppm & high accurancy as 1/10000% resisters for measurement equipment. lots of parts produced from this factory was gold legs.


They( This Factory) did not produce any parts for audio use. As the NPC, not mainly in audio field. So they did not understand how jitter effect the sound quality.

BTW, this is sample of the coming precision ~2ppm TCXO from
-10~+85 stability TCXO. Hope diyers will like them.

I will try to put this into my coming re-clock kit. Hope the performance will improve more.

thx

thomas

[Jocko Homo]

PPM is a useless parameter for audio. I don't care how low it is.

Jocko

[Kohjin Yamada]

Well, I don't think so.

PPM is very important to me I even use 45.1584MHz clock for my heavily modded SCD-1 by an external proffesional synthesizer.
http://www.programmedtest.com/pts160.html
Mine is oven controlled version, OCXO.

The fellow in here uses Cecium clock.
Rubidium is not good though Teac uses in their Esoteric G0-s.

My choice for the best combo will be a very good (but expensive) oven controlled x-tal osc. (will costs you more than $1000)

Kohjin

[jackinnj]

Originally posted by Kohjin Yamada

My choice for the best combo will be a very good (but expensive) oven controlled x-tal osc. (will costs you more than $1000)

Kohjin

You can purchase a used HP3586C (selective level receiver) with an ovenized 10MHz XO for around $100 -- only problem is that it needs 24 hours to warm up -- over a year they may wander a few PPM, NIST traceable etc. I use mine with a pair of HP3336B oscillators as the master clock -- you only need one for a whole mess of equipment!

You occasionally see Tracor Rubidium oscillators on the Bay -- not easy to fix, however.

MY CD clock -- garden variety !!!!! I just listen (sorry Elso).

[Kohjin Yamada]

Hi,

I always turned switch on the synthesizer of course, why not!

Forget about Rubidium OSC we tried and confirmed not good.

Kohjin

[tube-lover]

Dear Jocko,

Let me ask a silly question?

How can get standard XO in Low jitter. I saw the factory
selection for the crystal was use a equipment with XXXX.XXXXXXXXXXXXMhz to test & selection for them.

Will this selection can easy choose out the low jitter one??

thx

thomas

[Jocko Homo]

Well, for starters...........you need a very quiet power supply.

The circuit is important, although something as simple as a Pierce can work well.

Most "standard" XOs have poor jitter, because the circuit is not optimised for that, or really anything else. Except price.

High accuracy ones are optimised for accuracy. Some might spec jitter, but I doubt it.

The long term drift of a crystal is mostly a function of how clean the quartz is.

Jocko

[Bricolo]

and how do you optimize a circuit for low jitter?