Don - rather than repeat info that has been posted over the course of the past 3-4 weeks, suggest you start here https://www.febo.com/pipermail/time-nuts/2014-October/087274.html
Anthony -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Don Murray via time-nuts Sent: Tuesday, November 18, 2014 2:10 PM To: [email protected] Subject: Re: [time-nuts] STUPID QUESTION: Lucent KS-24361, HP/Symmetricom Z3809A, Z381... TNX Paul and Anthony... More questions... ;-) I see that the REF1 type unit outputs 15MHz... The REF0 unit has both 15MHz and 10MHz... So, if I am going to use GPS, I need REF1, but it only does 15MHz out, and I need 10MHz for my stuff... so how do REF1 and REF0 interface?? Or does it work that way?? TNX guys!! 73 Don W4WJ In a message dated 11/18/2014 12:28:06 P.M. Central Standard Time, [email protected] writes: In the picture its the top unit ref1 and its the left hand TNC and it does power the antenna. If no antenna you need to tie a resistor to ground on the tnc to fake it out. Regards Paul WB8TSL On Tue, Nov 18, 2014 at 11:49 AM, 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.
