Highly stable clock source

That is sure a very good instrument. However my need is small module that has 10MHz frequency source TTL level and ultra low jitter, temperature drift and long time use drift.

I will like an electronics engineer to take up and do it. In 1976, I knew an engineer who was working with HP to design 1ppb/C stable quartz clock and perhaps developed one that was near to this specs. I want not so great but 100ppb/C if 10ppb/C not possible, will do for me.

I am also willing to pay for it and do not want free things. My target estimates are $100 each for 10ppb/C and $20 each for 100ppb/C clock sources. Maxim manufactures 1ppm/C frequency source low jitter and yet to reach 0.1ppm/C. Perhaps next year they will be ready with such device for few dollars each.

You should check the Texas CDCE9xx or CDCEL9xx line.

(in the seventies we used standard Maxim clock generators piggy-backed to a power transistor and heated to 55 C°. Isolated with foam it worked as a very small thermostat...)

Creating an oven is a good idea. It saves dollars but may look crude. I will prefer to have a standard module with oven. I feel good when it works good and also looks good on PCB.

Try this one:

http://www.greenrayindustries.com/tcxo.html

Dear Qqberci

This reference is good one. Let me see if they really make to the specifications and also at reasonable price. Their specifications are good one particularly for TCXO XT5050 model at 0.04ppm for 0-50C range. Good. They also have 5ppm frequency control using an external voltage. However aging of 1ppm/year looks high and will require recalibration each year or earlier.

Thanks for giving me this link.

You welcome :-)

Can you use a stratum 1 source as used in serial multiplexed networking (T3/E3)? I believe that a stratum 1 clock is on the order of ppb in terms of accuracy.

Sure. Atomic clock is much better than oven quartz clock. Stratum 1 source is Cesium atomic clock. I will love if I can get these cheap or at affordable price. What is the price and what was the size of the module and do you get 10MHz source frequency output from these or 1Hz ? I need 10MHz source.

Not sure. My company was building a stratum 1 module that was about 5 X 6 inches. I think it got its time signiture off the web somehow, but was supposed to be very accurate.

30ppb will lose about 1s per year. hence 1ppb will be stable to 1s per 30 years.

LOW NOISE OCXO –OX6749 MODEL looks good at 0.01ppm and 10MHz. I actually was looking for such device, with TTL. However this one is not TTL so I need to have some comparator outside which may introduce phase noise and jitter. Let me see if I can get this at reasonable price.

Dear Sir,

we represent Symmetricom and have all types of precise timing solutions.

please go through the below link or just contact us on the below numbers.

http://www.symmttm.com/products_precision_frequency_references.asp

Mob 09902069763

tel 080-26507800

Prasad Patil

I have planned to use atomic clock from www.thinksrs.com/

For the time being that looks OK to me.