); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY [EMAIL PROTECTED] wrote: > Said, > > In this particular case, I would solder a "single header pin", to each > hole in the OCXO footprint, and then use a "single wire header > connector" to attach to it. > > Then, have all 4 wires connect to the interface board via a 4 pin, connector. > > This way, the Fury gets soldered only once and can be disconnected anytime. > > I will add that to the schematic. > > Bruce Griffiths, has been providing me with some excellent feedback on > the EFC interface design. I am making a few changes based on his > recommendations. > > The more I think about it, the more I am worried about ground > isolation between the HP OCXO and the rest of the system. > > I have a few ways to approach this. One is to simply provide 3 > different voltages to the system, each isolated from each other. In > other words, don't use > voltage regulators to get from +/-24V down to 12. > > The proper solution would be for a separate board which provides 3 > different DC outputs, all isolated from each other, including ground. > > 1. +24V for the oven. HP OCXO's only. > 2. +12V For the oven. This could be supplied by the Fury which also > compensates for temp. > 3. +/-12V for the EFC interface. > > The interface board must not add noise to the Fury. Looks like there's > more work to be done. > > -G > > George
On board regulators with "remote" sensing can easily accurately regulate the voltage between the OCXO connector pins and a standard differential amplifier can be used to eliminate/reduce the effect of any small low frequency voltage differences between the Fury and the OCXO EFC grounds. Thus using on board regulators to drop the 24V to a lower voltage for the OCXO should be OK. Bruce _______________________________________________ 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.
