The item is (back) on ebay which has pretty good pictures 321560316836
-pete On Tue, Nov 18, 2014 at 12:19 PM, Don Murray via time-nuts <[email protected]> wrote: > TNX Peter!! > > I had only seen a picture of REF1, with no GPS connector!! > > 73 > Don > W4WJ > > > In a message dated 11/18/2014 1:07:07 P.M. Central Standard Time, > [email protected] writes: > > Hi Don, > > J7, marked GPS antenna is a good start. This connector also powers your > GPS Antenna. > > Take care > > Peter > HB9DQY > > >> On 18 Nov 2014, at 11:49, Anthony Roby <[email protected]> wrote: >> >> If you search through the recent messages, you'll see a link to a set of > photos I posted. This one > https://drive.google.com/file/d/0B5tlecUITRBLc3JyMElTdUwzMHM shows the front > of the units. J7 provides the GPS power. >> >> Anthony >> >> -----Original Message----- >> From: time-nuts [mailto:[email protected]] On Behalf Of Don > Murray via time-nuts >> Sent: Tuesday, November 18, 2014 10:30 AM >> To: [email protected] >> Subject: [time-nuts] STUPID QUESTION: Lucent KS-24361, HP/Symmetricom > Z3809A, Z3810A, Z3811A, Z3812 >> >> Hello all... >> >> Just getting up to speed on the KS-24361... >> >> My stupid question (s)... >> >> Where does the GPS antenna connect?? >> >> Does the GPS antenna port power the antenna? >> >> Need a replacement for my dead HP Z3816A... ;-( >> >> TIA... >> >> >> >> 73 >> Don >> W4WJ >> >> >> >> In a message dated 11/18/2014 3:26:52 A.M. Central Standard Time, > [email protected] writes: >> >> One of my Z3805's (with the double oven 10811 ocxo iirc) also performs >> similarly at times to the 58503A mentioned by Said. From an adev > perspective >> it's close to my BVA at some tau's (around a hundred seconds or so > iirc.) >> At times though the output seems to "jump" in frequency. My other > Z3805 >> from the same source doesn't work as well. >> >> None of the 10811's in my various pieces of test gear (some of which I > basically purchased to get the 10811's) worked all that well from an Adev > perspective. I used to buy HP5328 counters on the usual auction site with >> 10811's and the 500MHz C channel for quite low prices. At least I > still have >> a nice collection of frequency counters. >> >> >> Sent from my iPad >> >> On 2014-11-17, at 1:23 PM, Said Jackson via time-nuts > <[email protected]> >> wrote: >> >>> Correct on all counts Bob. >>> >>> My two 58503A units from China are great for both ADEV and PN >> measurements, better than anything else I have as a combo (I have > Wenzel ULNs for even lower PN testing but they don't have any usable ADEV). > I > also have a costly BVA and it can't compete against the HP unit. >>> >>> Those 10811s just rule. >>> >>> In fact my only complaint about the 58503A are the 60Hz related small >> spurs you can see in the plots... >>> >>> Bye, >>> Said >>> >>> Sent From iPhone >>> >>>> On Nov 17, 2014, at 12:28, Bob Camp <[email protected]> wrote: >>>> >>>> Hi >>>> >>>> The 58503 is a Z3801 with a pretty instrument style package put >>>> around >> it - right? >>>> >>>> If so, it might / should have a 10811 in it rather than an MTI OCXO. >> The 10811 is rated for -155 dbc at 100 Hz. That is much better than the > noise floor that the MTI ??s seem to produce at 100 Hz. About the only > other GPSDO OCXO that gets to that level is the one in the original TBolts . > There you very much have to deal with spurs. That make the noise floor of > limited use in a practical system. >>>> >>>> Bob >>>> >>>>> On Nov 17, 2014, at 2:26 PM, [email protected] wrote: >>>>> >>>>> Hi Bob, >>>>> >>>>> yes, the 10MHz plot is rotten, no doubt. The 15MHz plot is quite >>>>> good >> till about 40Hz offset, then it becomes pretty rotten too. >>>>> >>>>> Here is one of my 58503A units (using the 10811 OCXO) as a >> comparison.. measured against our DROR-IIA (this plot was actually done > to show the DROR-IIA PN, but since that unit actually has less noise and > spurs than the 58503A we can simply use it as the reference for this > purpose). >>>>> >>>>> The good news is that getting the close-in phase noise to be good >>>>> is >> very hard to do and the unit delivers that out-of-the box already. > Filtering out the noise and spurs above 40Hz offset is pretty easy to do. It > should be fairly straight forward to cobble up a small PN filter for those > units to get rid of the noise and spurs above 40Hz offset. >>>>> >>>>> bye, >>>>> Said >>>>> >>>>> In a message dated 11/17/2014 09:31:46 Pacific Standard Time, >> [email protected] writes: >>>>> Hi >>>>> >>>>> Here ??s the phase noise on the 15 MHz. There are a few spurs, and >>>>> an >> very real hump out at the likely frequency of the Lucent switcher. The > 15 MHz is pretty clean compared to most /all of the other units I ??ve > seen on the surplus market. >>>>> >>>>> I would not multiply this up to 40 GHz with a broadband multiplier. >>>>> I >> would be quite happy to run it into a PLL with a rational bandwidth. > You will beat the noise on the output with a fairly simple VHF VCXO past 100 > Hz. >> No reason to have a bandwidth outside the 20 to 80 Hz range. >>>>> >>>>> Math: >>>>> >>>>> 15 MHz to 150 MHz -> 20 log (N) -> 20 db. >>>>> >>>>> -140 dbc / Hz shown below at 100 Hz offset -> -120 dbc/Hz >>>>> >>>>> You can get numbers better than -120 dbc/Hz at 100 Hz offset out of >>>>> a >> number of pretty simple VHF VCXO circuits. Bert has one that seems to > work fine for him. >>>>> >>>>> Bob >>>>> >>>>> <DROR-IIA_Phase_Noise.png> >>>> >>> _______________________________________________ >>> 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. >> _______________________________________________ >> 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. _______________________________________________ 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.
