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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.
