Don't forget to tighten the fiber connectors and correct for the length of the fiber or you'll be off by 60ns! ;)
On Wed, Apr 11, 2012 at 1:17 PM, Chris Albertson <[email protected]>wrote: > On Wed, Apr 11, 2012 at 7:19 AM, Bob Bownes <[email protected]> wrote: > > > The issue is that this treats the t'bolt as a sacrificial item. I would > > contend that, at a cost of $80-90, you could spend far more time and > effort > > trying to isolate, amplify, correct, and bias the antenna than that is > > worth. Effort and gear that would need to be replaced every time > > I thought of that right after I suggested using fiber data lines. > You'd loose a few expensive t-bolts. But I think there is a better > and cheaper way to go: Buy a cheap Motorola Oncore receiver. The > Oncore UT costs all of about $18 on eBay, buy four of them. The > only signal you need to bring into the workroom from an Oncore is PPS > and that is "way easy" to do using fiber. The other signals (rs232) > can be connected as needed and that is not often. Then you build a > "standard" GSPDO in the workshop. The initial cost is lower and the > engineering is simple (because only the PPS has to go over fiber) > > The Oncore and GPSDO can give as good of result as the t-bolt. It > mostly depends on how good the OCXO is, maybe even you build two > GPSDOs running off the same PPS the second one being Rubinium based. > My $35 Rb can holdover for many weeks (at the level I need) if GPS is > down. > > Then you can install the t-bolt with an antenna you can disconnect and > only use the t-bolt now and then during good wearer to double check > the GPSDO that you can leave running 24x7 > > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > 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.
