I looked and must have hit the same site you did for the sulzer. Yes I expect a lonnnng warmup. I used them in the navy and we never let them go cold. circa 1973-1979. Took them to the cal lab on battery etc. I thought maybe I would have a manual I don't. You are lucky to get one. Great reference. I do have two model 5a sulzers. I actually use one to generate the lab frequencies for "stuff". I really should put it back together which I can do and just create a more modern divider. That would consume less power and be equally clean also take less space. 1 RU. Regards Paul WB8TSL
On Sat, Apr 27, 2013 at 12:21 PM, Gregory Muir <engineer...@mt.net> wrote: > Thank you for you replies Dave and Paul! > > Well, patience won out and I left the unit on for a considerably longer > time. The inner oven meter indication then started to come up off of zero > after nearly seven hours. Not knowing the thermal mass it has to heat I > guess I assumed that it would have a slightly quicker response time. My > ignorance... > > This morning I checked the unit again and the inner oven indication is > slightly lower than where it should be in the red "OK" region on the meter > meaning that the heater is still delivering a little more than normal heat > and the 5 MHz frequency, which started out at ~+33 Hz cold, is now at -1.2 > Hz and holding steady telling me that the heat delivered has overshot its > normal operating point. Granted I have not let the crystal assembly soak > for any considerable time but my mind is thinking about a possible bias in > the heater control circuit by a leaky passive component or transistor > causing it to remain on a little more than necessary. But, again, I will be > patient and watch its progress over the upcoming days. > > I pulled out a Sulzer 5A manual and took a closer look at the schematic. > From what I observed in the URQ-10 circuitry that is external to the FE-10 > oscillator itself, the power supply and frequency handling portions appear > to come close to nearly a carbon copy of the older Sulzer unit. The non-A > version URQ-10 design is considerably different and somewhat more complex. > > And if anyone out there comes across an "A" version manual or has one in > their possession, I would be willing to compensate them for a photocopy. > > Regards, > > Greg > _______________________________________________ > 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. > _______________________________________________ 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.