Dear Azelio, Do you know how the Z3805A compares to the 58503A?
Cheers! Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Sep 7, 2012, at 3:58 PM, Azelio Boriani <[email protected]> wrote: > Good one, the HP58503A, actually it is my reference at work. > > On Fri, Sep 7, 2012 at 10:37 PM, <[email protected]> wrote: > >> Hello Robert, >> >> your question is like asking which car you should buy, or which airline you >> should fly :) >> >> Everyone will have a different answer. >> >> But I do not recommend the Thunderbolts, it's a crab-shoot with them >> (different versions have different performance, the new ones are actually >> worse >> than older versions because of the temperature chip issue, the GPS is >> known >> to have lock issues, they don't work well until you spend a lot of time >> fine-tuning the parameters, etc etc) - that has all been discussed here >> ad-infinitum and you can find it in the archives. >> >> I recommend you search Ebay for HP 58503A. I just bought a number of them >> from a very well known seller in China, and they are absolutely superb, >> much better than any Rubidium unit I have tested. Much better than the >> Thunderbolt I have, and just slightly more expensive. He sells an entire >> kit for >> around $500, and it arrived here in less than a week (Northern >> California). >> >> This seller starts those units at around $260 I think. Performance you can >> get from these if you get a good one is: phase noise floor of around >> -163dBc, ADEV of 7E-013 to about 1E-012 to over 100s. Leapsecond.com has a >> number of test papers on these units. Caveat-emptor: there are significant >> unit-to-unit variations as with all GPSDO, Tom on leapsecond.comdiscusses >> this >> in detail. BTW: these are essentially the same unit as the Z3801A, just >> different software (ID string). >> >> I also have a Z3815A, and it is not even in the same class as the >> Z3801A/58503A. It is very noisy compared to the 58503A unit. I do not >> recommend the >> Z3815A, but it is a unique oscillator design,and some folks collect it for >> that oscillator. The 58503A uses a double oven version of the HP 10811A, >> which is a fantastic oscillator if you get a well-working one. >> >> If you want something low-cost with reasonable performance, brand new with >> warranty, antenna, and accessories, Jackson Labs Technologies, Inc. has >> the GPSTCXO eval kit for Time-Nuts special academic pricing of $300, which >> we >> believe is the lowest-cost true GPSDO (not NCO) in current production. >> Disclaimer: I work for them. >> >> bye, >> Said >> >> >> >> >> In a message dated 9/7/2012 13:09:24 Pacific Daylight Time, >> [email protected] writes: >> >> Welcome aboard, >> yes, there is no FAQ about how to start in this hobby... should I try to >> implement one? Anyway, start with a Trimble Thunderbolt (aka TBolt), later >> you will know why it is highly recommended (direct OCXO disciplining and >> LH >> software support, mainly). I have a Z3815A with the famous (or infamous) >> E1938A "hockey puck" OCXO. They are all GPSDOs and there should not be any >> difference among them but, yes, there are differences in their performance >> and being a time-nut means test and find out. Then there are GPS >> disciplined Rubidiums, but take this step after the first GPSDO is >> correctly installed and stabilized. Start with the antenna: find a >> suitable >> place, with a 360 deg clear view of the sky, a satellite TV cable (sounds >> unusual, but works great). >> >> On Fri, Sep 7, 2012 at 8:52 PM, Robert Darlington >> <[email protected]>wrote: >> >>> You want to start with a GPSDO. I like the Trimble Thunderbolt. The >>> price is right and they're readily available. I have no experience >>> with the HP units but they seem to be highly regarded. >>> >>> Rb oscillators are great for some things, but need to be calibrated. >>> That's where the GPSDO comes in. >>> >>> Also, don't forget the antenna. You'll want something along these >>> lines: >>> >> >> http://www.ebay.com/itm/lucent-GPS-Timing-Reference-Antenna-antenne-40db-N-/230848464732?pt=GPS_Antennas&hash=item35bfa4075c#ht_2199wt_1404 >>> >>> Welcome aboard, and I'm apologizing in advance for how much money >>> you'll be spending on new toys. >>> >>> -Bob >> >> _______________________________________________ >> 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.
