Hi Sverre, This type of 10 MHz output has short term stability problems and isn't suitable for direct drive of a K3 (imho). It *could* be used, if integrated over a long time constant (thinking many seconds) to drive a D.O., but that would take additional circuitry. It might be quite a project.
You're probably better off with A GPSDO or a Rubidium source. Even a plain OCXO would work if you can keep it calibrated. 73, matt W6NIA On Thu, 13 Aug 2015 06:36:31 -0700 (MST), you wrote: >Some recent GPS modules (ublox Neo 7) have a programmable output that in >addition to the 1 pps output can be programmed even to output 10 MHz. This >output has a lot of jitter as it seems to be derived from a 48 MHz clock >which is divided down in such a way as to generate a mix of short and long >cycles but so that the average frequency is maintained accurately at 10 MHz. > >A description can be found here >https://sites.google.com/site/g4zfqradio/u-blox_neo-6-7 and performance is >partly described here: >https://www.febo.com/pipermail/time-nuts/2014-August/086257.html > >My question is regarding the K3 external reference input. Is this source >good enough to drive the K3 reference? Can the K3 clean up the jitter >internally, or does the K3 require a source with much less phase noise? > > > > >----- >Sverre, LA3ZA > >K2 #2198, K3 #3391, >LA3ZA Blog: http://la3za.blogspot.com, >LA3ZA Unofficial Guide to K2 modifications: >http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html Matt Zilmer, W6NIA -- "Always store beer in a dark place." -R. Heinlein ______________________________________________________________ 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]
