Ulrich, If you're interested in a very good 5MHz OXCO, then I recommend the MTI Milliren model 260. (see Ebay # 271915776504). The data sheet is available.from several places, including MTI's site. The daily aging rate for it is spec'ed at 5e-11, thermal stability is 2e-10 over -30C to +70C. That's roughly 10x better than the 10811, and much cheaper. The Z3812A GPSDO units both use the MTI OXCO, so you could buy 1 or 2 of the REF-0 units and get the good OXCO performance plus all the other stuff that surrounds it.
Cheers, Dave M KA2WEU--- via time-nuts wrote: > How good or bad is the 10811 and which one on ebay is a better > choice ? > I am looking for a very goo 5 MHz crystal oscillator with > documentation . > > Thanks, Ulrich N1UL > > > In a message dated 8/8/2015 7:16:37 P.M. Eastern Daylight Time, > [email protected] writes: > > Hi > > Ok, so John’s observation was the correct one. The data we are > looking at > is *not* the > performance of the OCXO’s but the strange behavior of the counter at > short ADEV Tau’s. > > Sorry for my bashing your poor 10811. > > Bob > >> On Aug 8, 2015, at 12:25 PM, [email protected] wrote: >> >> Hi all, >> >> I try to ansver to all you: >> >> Luciano, how was the blue trace taken? Is this from your DMTD >> project? > If so, it's looking promising. >> The green and magenta traces are definitely in the right ballpark >> for > measurements on a 5370-class counter. At 3E-11 @ t=12s the magenta > trace is optimistic but not outrageously so, while the green trace > looks exactly like I'd expect for a typical 10811 measured on a > 5370. The observed noise is > due entirely to the counter until about t=200s. We see a glimpse of > the 10811's typical ADEV at about 250 seconds, just before either > drift or ADEV uncertainty causes the trace to turn upwards. A longer > run would be needed to distinguish between these two situations. >> >> -- john, KE5FX >> Miles Design LLC >> >> r: no, all the measurements are taken using an HP53132A in >> frequency > mode. The difference can be the gate time. Using 1 second the > resolution is lower than using 2 Second that permit the max counter > resolution. >> >> Hi >> >> Well an un-stated assumption of mine was that they all came from the > same measurement system and that it >> had the same floor under all circumstances…. >> >> Bob >> >> r: all the measurements are under the same conditions except for the > gate time of the counter. >> >> Hi Luciano, >> >> Can you give me the link to your ADEV posting image about 10811 vs >> 105 > oscillators? I had it and now can't seem to find it. I wanted to > look at your plots as I read John Miles' comments. Many thanks. >> >> I have two very high performing HP10811-60109 OCXO units which I got > from Corby. >> >> Many thanks. >> >> Jim Robbins >> N1JR >> >> r: Jim, I will load soon some files on my site. The 105B I have is a > fantastic exception, unfortunately it have a defect, may be a bad > solder inside cause randomly a phase jump and return to the original > phase trend, so all The long term ADEV are distorted by this problem > I have to fix. >> >> Tom VB, i will do all the cross measurements on 10811, 00105 and > rubidium I have and i will upload they but I need time to do this. >> Unfortunately I have only the HP53132A as TIC and my best reference >> are > four HP5065A. I normally use the counter function because the TI > function > on 1 PPS have 100 time less resolution. >> Will be interesting doing also the Phase noise tests. I will do it. >> please see: > http://www.timeok.it/files/time_and_frequency_house_standard_201r.pdf >> >> Luciano >> www.timeok.it >> >> >> >> >> >> On Sat 08/08/15 02:23 , Bob Camp <[email protected]> wrote: >> >>> Hi >>> >>> Well an un-stated assumption of mine was that they all came from >>> the > same >>> measurement system and that it >>> had the same floor under all circumstances…. >>> >>> Bob >>> >>>> On Aug 7, 2015, at 5:21 PM, John Miles wrote: >>>> >>>>> Hi >>>>> >>>>> If that data is correct, then the 10811 you have is defective. >>>>> Bob >>>> >>>> Well... some of the data is reasonable for a scenario where a >>>> counter is being used to measure OCXOs. >>>> >>>> Looking at the ADEV plot, I'd say the blue trace (HP105B vs >>>> 5065A) is >>> the most questionable one if it came from a standalone TIC or >>> frequency counter, because 7E-12 @ t=1s isn't achievable with most >>> counters under most circumstances. A Wavecrest box can measure at >>> that level if it's > set >>> up _perfectly_ to take bursts of 100+ wrap-free averages within a >>> small fraction of the t0 interval. It might also be doable with an >>> HP 5370A/B under similar conditions, but I'd have less confidence >>> that the > averaging >>> isn't distorting the measurement. So while It looks like a valid >>> measurement of an OCXO with some minor crosstalk or other external >>> interference, that may just be a coincidence. >>>> >>>> Luciano, how was the blue trace taken? Is this from your DMTD >>>> project? >>> If so, it's looking promising. >>>> >>>> The green and magenta traces are definitely in the right ballpark >>>> for >>> measurements on a 5370-class counter. At 3E-11 @ t=12s the magenta > trace is >>> optimistic but not outrageously so, while the green trace looks >>> exactly like I'd expect for a typical 10811 measured on a 5370. >>> The observed > noise >>> is due entirely to the counter until about t=200s. We see a >>> glimpse of > the >>> 10811's typical ADEV at about 250 seconds, just before either >>> drift or ADEV uncertainty causes the trace to turn upwards. A >>> longer run would be > needed >>> to distinguish between these two situations. >>>> >>>> -- john, KE5FX >>>> Miles Design LLC >>>> >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts [1] >>>> 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 [2] >>> and follow the instructions there. >>> >>> >>> >>> Links: >>> ------ >>> [1] >>> > http://webmail.timeok.it/parse.php?redirect=https://www.febo.com/cgi-bin/ma >>> ilman/listinfo/time-nuts[2] >>> > http://webmail.timeok.it/parse.php?redirect=https://www.febo.com/cgi-bin/ma >>> ilman/listinfo/time-nuts >>> >> Message sent via Atmail Open - http://atmail.org/ >> _______________________________________________ >> 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. > _______________________________________________ > 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. When the people fear the government, there is tyranny. When the government fears the people, there is liberty -- Thomas Jefferson Dave M _______________________________________________ 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.
