); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY JOS Earthlink wrote: > 73 de K1JOS (Jerry) > CCA #11906 > CRA #1777 > > > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of [EMAIL PROTECTED] > Sent: Saturday, September 01, 2007 12:00 PM > To: [email protected] > Subject: time-nuts Digest, Vol 38, Issue 1 > > > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Send time-nuts mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Hi Group, > > I just recently completed a GPSDO inside a HP5328A. I was going to use the > Schera board but opted for the VE2ZAZ. At first I tried to cannibalize the > HP5328A's internal power supply for either the +/-15VDC or +5/-5.2VDC supply > but I discovered the hard way that they would not supply enough current > (burnt out CR1 and Q7) or the supplies would not be well regulated. I opted > therefore to include inside the case a +/-12VDC swtiching supply powered > externally by a 24VDC wall wart. From the +/-12VDC dual supply I cleaned up > the rails with an L7805 and L7905. I was able to bring out to the the rear > panel the 10Mhz and 5Mhz references plus the SMA GPS antenna connector. On > the side panel I put in a momentary pushbutton switch to reset the GPS if > needed plus a DB9 RS232 for serial communicatiosn with either the GPS using > software like VisualGPS) or to monitor the VE2ZAZ board status. A simple > DPDT switch next to the DB9 connector controls the serial selection. I have > complete pictures if anyone is interested and it works very nicely. > > Jerry > K1JOS > > > _______________________________________________ > 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. > > Jerry
It is amusing/distressing to see that the myth that using an FLL to lock an oscillator to the PPS output of a GPS receiver is a good approach still persists. The optimum solution is a phase lock loop. Whilst building an FLL is instructive/educational, if you want the best GPSDO performance you should really use a PLL. Bruce _______________________________________________ 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.
