); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY In a message dated 11/7/2007 14:04:04 Pacific Standard Time, [EMAIL PROTECTED] writes:
>However for an OCXO using a high thermal gain oven controller (E1938A) >or a double oven (OSA B8607) such effects may be significant if a single >ground pin is used. Hi Bruce, on our 230 single-oven version of Fury the effect is negligible as you state. However on the 270 Double-Oven option it can become significant much like on an E1938A. One simple solution is to use two transformer-isolated power supplies, one 12V one for Fury, and one for the OCXO heater. No ground current can flow due to the transformer isolation. As long as the EFC control ground is connected as close to the Oven enclosure as possible there should be no negative effect on the system since no current can flow through the EFC SMA cable. BTW: I also did some microvolt measurements on the OCXO Euro-can used on Fury, and I am happy to say that I cannot detect any voltage drop whatsoever on the OCXO case itself. So it should be safe to solder the SMA coax cable center pin to the EFC pin of the OCXO, and the SMA cable ground shield to the case next to the EFC pin (as long as the OCXO is not overheated by the soldering itself). bye, Said ************************************** See what's new at http://www.aol.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
