On Sun, 02 Nov 2008 01:28:34 -0500, Matt Osborn <[EMAIL PROTECTED]> wrote:
Hi all, Thanks for all the help and ideas with the IsoTemp/Fury combination. I followed Hal Murray's advice fired up the combination yesterday (its been running for about 24 hours now) and everything is working as advertised. The IsoTemp locked in with an EFC of 4.523xxxx and today is down to 4.498xxxx volts and falling slowly, so it would appear that boosting the Fury EFC range won't be necessary. Bruce Griffiths suggested a 1.6 gain buffer amplifier and Jim Miller had designed that exact amplifier to boost an EFC range of 0 - 5v to 0 - 8v specifically for the IsoTemp OCXO134. Jim had a PCB available, so I ordered it and will build that up if the IsoTemp starts aging in the wrong direction. I believe that problem has been addressed. I've not yet solved the power sequence problem (if it exists); I'll follow Said's advice and just try powering both from the same supply and see if the Fury reset hold time is sufficient. If not, I'll pursue Jim Hall's MAX6819 approach. That would seem to be a simple and inexpensive solution. Now I'm trying to understand Bill Jones' GPSCon program and what it is telling me about the Fury GPSDO. With some history provided by GPSCon and a better understanding of just what, exactly, I should expect to see and to strive for, I will apply Said's suggestions and see what develops. BTW, it would appear as though my HP 53131A counter reads 220 mHz low with a 2 second gate time. There appears to be no appreciable drift; it always reads 220 mHz low. I'm sure there is a name for that measurement, I hope to learn it soon. Thanks to all for your help. I'm amazed at the high signal to noise ratio on this list. -- kc0ukk at msosborn dot com _______________________________________________ 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.
