I bought a module like that. If you set the output frequency to something that divides evenly into 48MHz, then the output is quite stable. Otherwise, if you set it to something else like 10MHz, the jitter is quite obvious on the scope. It is fine for jobs like calibrating a frequency counter or zero-beating a transceiver. You'd probably want to smooth out the jitter though if you want to use it for a K3 reference oscillator. 73, Matt VK2RQ
Envoyé à partir d'Outlook On Sat, Oct 3, 2015 at 8:19 AM -0700, "brian" <[email protected]> wrote: LA3ZA used a UBLOX NEO-7 GPS unit to lock his K3. This $20 unit including complete development board can be obtained here. http://www.ebay.co.uk/itm/301199083821 It's tiny, has a patch antenna (although a $10 active antenna works better) and consumes under 60ma. It can be powered from +5v or a USB port. It fits in a 2"x3" box. Once set up it is stand alone not requiring a computer connection. There was some question as to whether the jitter of the unit would disqualify it as a decent ref osc. A posting on the SpectrumLab group indicated that it seems quite adequate for K3 disciplining. [email protected] Accuracy within 0.02 to 0.03 Hz of a Rb standard. Output spectrum seems to indicate that jitter is not a problem for this purpose. 73 de Brian/K3KO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
