There is information on this thread on how you can tap into the unit at various points to get 20 and 60Mhz. Other owners have used a divider to bring it to the 10Mhz frequency desired. I have one of these units and haven't gone around to dividing it down. I purchased mine from Ebay and the seller notes that this particular version will output 10Mhz for a second or two and then disappear. I suspect you have the same version, maybe even the same seller, so the operation of these particular units appears to be normal. Mine will lock so I know it's working. http://www.eevblog.com/forum/testgear/fe-5680b-1pps-to-10mhz/msg556800/#msg556800 I as well wish there was a quick way of converting it back to 10Mhz. I am sure it can be done, just not sure how or where to look <g>
-=Bryan=- > From: [email protected] > Date: Fri, 25 Sep 2015 17:45:08 -0400 > To: [email protected] > Subject: Re: [time-nuts] FE-5680B Rubidium and DDS > > Hi > > There is no dump of the firmware. The problem you are most likely > having is not firmware related. > > If the VCXO i the unit drifts to far it needs to be re-tuned. Until this is > done > the device simply sits in a “search for lock” loop forever and ever. > > Simple way to do it: > > Monitor the VCXO and bump the trimmer until the frequency goes above the > intended > target (10 x N MHz depending on your monitor point) by at least 0.15 ppm. The > sweep is > slow enough that a counter running at a 0.1 second gate will easily show you > what’s going on. > > Of course it can be other things. All of them are a bit more involved to fix. > > > Bob > > > On Sep 25, 2015, at 11:34 AM, Clint Jay <[email protected]> wrote: > > > > I've recently purchased one of the PPS Only FE Rubidium standards from eBay > > and, like many others I suspect, haven't been able to get a stable output > > frequency that lasts longer than a few seconds from the module. > > > > It appears that the 10MHz source vanishes after a few seconds but this is > > controlled by firmware. > > > > Which leads to my question, there is a dump of the firmware from the > > FE-5680, has anyone tried to reprogram one? > > -- > > Clint. > > > > *No trees were harmed in the sending of this mail. However, a large number > > of electrons were greatly inconvenienced.* > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
