I own a 5680b and while it only outputs a PPS signal there is a very stable 30MHz signal available inside the unit IIRC. I can dig mine out and find the signal if that's of use? I believe they can be modded for 10MHz output on the 15p D type but I've just not managed to find time to get around to that yet. On 5 Nov 2016 13:33, "EB4APL" <eb4apl@gmail.com> wrote: I agree that FE-5680 is a whole family of products with very different features and these can not deducted from the labels. In my case I own a FE-5680A which outputs 1 PPS and a fixed (but slightly tunable) 10 MHz and needs 2 power supply voltages, +5 V and + 15 V. I am sending directly to you the information of the breakout board that I use and it includes the pinout of this unit. A caution here, some of the FE-5680 variations have different pinouts. Regards, Ignacio EB4APL El 05/11/2016 a las 2:01, Peter Reilley escribió: > It is a FE-5680B. It is my understanding that these were made in many > variations > of features but that what features were present or absent could not be > known > from the model numbers of other external identifying information. This one > has the 1 PPS apparently. > > Pete. > > > > On 11/4/2016 1:07 PM, EB4APL wrote: > >> A bit OT, but regarding your Rb, some units needs to be powered thru 2 >> pins, one is used only for the 10 MHz output buffer, if remember it >> correctly. Which is your model number? >> >> Ignacio EB4APL >> >> >> El 04/11/2016 a las 16:35, Peter Reilley escribió: >> >>> I gave up on trying to use the GPS 1 PPS signal to calibrate the 10 MHz >>> OCXO's that >>> I have. The reason that others have pointed out is that the >>> uncorrected 1 PPS >>> signal from the GPS is has just a little too much a jitter to use it for >>> calibration >>> with your eye using a scope. If it were sawtooth corrected then it >>> would be better >>> but you really need a GPS disciplined oscillator. >>> >>> Not to be outdone, I brought out a rubidium oscillator that I had put >>> away because >>> it did not appear to work properly. It only put out a 1 PPS signal and >>> nothing else. >>> I compared that with the GPS PPS and could get a good comparison on the >>> scope. >>> The rubidium drifted about 40 nS over 12 hours. So it seemed to be >>> good. >>> >>> With that I could adjust the OCXO's in my 5370's. The spec for the HP >>> 5370B with >>> a HP 10811 OCXO is better than 1 X 10^-10 RMS for 1 sec average. That >>> is, it should >>> take more than 1,000 seconds for one 10 MHz wave to shift by 360 >>> degrees. That >>> is very hard to do using the screw adjustment in the OCXO. Even the >>> slightest >>> movement possible will cause a frequency change greater that is >>> spec'ed. How >>> do cal labs do it? >>> >>> My HP 5370A has a 10544 OCXO which is spec'ed for short term stability of >>> better than 1 X 10^11 for 1 second. Even better than the 5370B! The >>> adjustment >>> screw is much coarser and it is not possible to get any better than a >>> few seconds for >>> one cycle phase shift of the 10 MHz OCXO against the standard. It seems >>> that I can't >>> get even close to the spec. >>> >>> These have been running for a few days. It that enough? >>> >>> Pete. >>> >> >> >> --- >> El software de antivirus Avast ha analizado este correo electrónico en >> busca de virus. >> https://www.avast.com/antivirus >> >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > > --- El software de antivirus Avast ha analizado este correo electrónico en busca de virus. https://www.avast.com/antivirus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/m ailman/listinfo/time-nuts and follow the instructions there.