Hi Raj, Prasad, all,
Really sorry, I though yesterday I should have gone directly to bed instead of reading my e-mails.
I read the article too fast...
Yes this new design is really interesting and all in all a 1500 USD price point is not so high for professional applications.
Some laboratories were using VLF or HF radio-clock signals but they are shut down or at least of reduced budget in many countries.
Rubidium clocks are not so expensive but need a GPS source for calibration, and in the concrete building of many laboratories it is not so convenient...
73,
Yan.
---
Yannick DEVOS - XV4Y/XV4TUJ
http://capheda.wordpress.com/ (Blog in french)
http://www.qsl.net/xv4tuj/ (web page in english)
Le 25 avr. 2011 à 21:50, Raj a écrit :
>
>
> Hi Yan,
>
> These references don't need any input. They use the modulation of a cesium beam to generate a clock frequency. These chaps have made the Cesium lamp in 2mm cubic volume.. amazing!
>
> Currently the affordable one is an used Rubedium reference which is about 120U$ range. This has good short term stability. One needs to calibrate it with a GPS based oscillator. I use a Thunderbolt unit with an external antenna and compare it with an old Rb unit and adjust it over a 10-20 minute period and that is good enough for me. I use the Rb output 10Mhz into my counters as external reference and take great pleasure in saying the accuracy is about 1 Hz in 1 GHz.. highly addictive hobby!
>
> 73 Raj vu2zap
>
>
>> As I understand this board needs to receive a radio signal in order to get the time.
>> Do you receive reliably this signal in India? What is its frequency?
>>
>> Back in Europe few years ago I was used to have clocks synchronized with DCF77 signal on 77 KHz.
>> They are of no usage here for clock reference...
>>
>> 73,
>> Yan.
>> ---
>> Yannick DEVOS - XV4Y/XV4TUJ
>> http://capheda.wordpress.com/ (Blog in french)
>> http://www.qsl.net/xv4tuj/ (web page in english)
>>
>> Le 25 avr. 2011 à 15:01, Raj a écrit :
>>
>> >
>> >
>> > This should keep our homebrewers from drifting!
>> >
>> > From the time-nuts group:
>> >
>> > http://tinyurl.com/CesiumMini
>> >
>> > or click here
>> >
>> > 73
>> > --
>> > Raj, vu2zap
>> > Bengaluru, South India.
>> >
>> >
>
>
>
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