I see I am in Really Good Company Don Rob Sherwood. > Paul, > > Your last paragraph was a hoot. A ham friend of mine recently rented a > storage shed to keep all his spare test equipment and parts units. Another > ham friend used to have four storage units to store all his "stuff". The > disease is not curable with either time or antibiotics. > > My XYL will have to deal with two homes with labs and ham shacks, 7 towers, 13 > yagis, etc. when I am SK. Need I say more. > > Rob > NC0B > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of paul swed > Sent: Sunday, January 10, 2016 1:56 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] New Member + Basic Questions > > > > Nathan, > Bob shared a link for the Lucent units and a great amount of detail has been > shared on Time-nuts about them. They will do what you want. The Ref0 requires > a external GPS receiver and another Time-Nuts Arduino. It works really well > and the quality of the ref0 seems to be that of the 1pps feeding it. > But they also make a no brainer pair that has a ref0 and ref1 that has a built > in GPS receiver. They were $175 but they go all over the place in price. But > it does just work. > Trace-ability is an interesting word around this group. From your description > not sure thats really a need. Accept for the oven oscillator they all are > great and yes even really good oven oscillators are great and can actually be > amazing. Not cheap at all though. > You describe your counter and sig gen they have a resolution of .1Hz so going > further isn't really all that helpful. > Now here is the real issue you face and its far more of an issue then you > expect. > First the generator and oscillator and suddenly you find yourself acquiring > more stuff. Maybe a RB, then a Cesium, distribution amplifiers, better > antennas. Sound familiar? You are doooomed. Back away real fast. > Good luck > Paul > WB8TSL > > On Sun, Jan 10, 2016 at 2:42 PM, Bob Camp <[email protected]> wrote: > >> Hi >> >> > On Jan 10, 2016, at 1:25 PM, Nathan Johnson <[email protected]> wrote: >> > >> > Hello All, >> > I'm a ham radio operator, for just a few years, and electronics nut >> > for >> many >> > more. I have been reading the archives and trying to learn a bit. I >> > am >> wanting >> > to develop an accurate frequency standard for "lab" and radio use. I >> > see >> that I >> > have 3 basic options that are possible on my budget, a decent >> > OCXO-based >> device, >> > a rubidium standard, and a GPSDO. My current uses are to supply >> > accurate >> timing >> > to a signal generator(not yet purchased, HP 8640/8650-something) and >> > a >> frequency >> > counter(Fluke 1953), mostly used in aligning radios. >> > In the near future I am hoping to expand that to a homebrew HF >> > transceiver(probably clocking a DDS chip of some sort), and some >> > higher frequency(possibly up to 10GHz) transverters. >> > So what I have learned so far about each option: >> > -OCXO is probably stable enough for what I am trying to do, but by >> > itself provides no guarantee of absolute accuracy(I'm looking at the >> > microwave operators "weapon of choice", the Isotemp 134-10), has an >> > adjustment pin >> for a >> > tuning voltage, but no idea what an appropriate value is for that >> > voltage without access to a more accurate standard. I will probably >> > build an >> OCXO device >> > of some kind anyway as an interim measure while I earn for the money >> > to >> obtain >> > something better, and to validate a distribution amp within the lab etc. >> > -Rubidium Standard seems like a very nice idea, but it's still not >> traceable in >> > terms of absolute accuracy(although the adjustment range of the >> > available standards appears to be several orders of magnitude better >> > than I am >> likely to >> > need). The available standards are being re-imported from China, >> > with >> unknown >> > hours or life remaining, and in some cases unknown condition. They >> appear to be >> > power hogs. A $200 gamble. >> > -GPSDOs have many options available, and are referenced to primary >> standards. >> > Pretty sure this is where I want to go. I'm looking at Item# >> 231803015799 on the >> > usual auction site, and this seems to be everything I need? I also >> looked at >> > item# 111514491254, but there doesn't seem to be any documentation >> > about >> what's >> > inside. >> >> The first item you reference is a Nortel GPSTM with all the “stuff” to >> make it work other than the power supply. If you dig into the >> archives, there is a *lot* of information on them there. >> >> The second item is a Chinese Ham built GPSDO without the antenna. It >> has the nice feature of being actively developed. If you can read >> Chinese, you can tune in to the lists that have information on it. >> >> Of the two, I’d go for the first one from a US seller that I’ve had >> good luck with. >> >> A somewhat more “do it yourself” option is: >> >> >> http://www.ebay.com/itm/221852021307?_trksid=p2055119.m1438.l2649&ssPa >> geName=STRK%3AMEBIDX%3AIT >> >> combined with a GPS receiver board. They also are available in a “2 >> for a bit less” form from the same seller. >> >> Each item has it’s plusses and minuses. The third item has a pretty >> clean >> 15 MHz output for microwave use. >> All of the 10 MHz outputs are a bit dirty noise wise if you decide to >> multiply them up to > 10 GHz. The normal approach in that case is to >> lock up a clean 100 to 150 MHz range VCXO to the GPSDO and then >> multiply the VCXO output to microwaves. >> >> All of them are quite adequate to supply a reference to a signal >> generator or a counter. All are good enough for normal HF radio use. >> >> Bob >> >> >> >> > Am I missing key points here? Or am I headed on the right path? >> Appriciate any >> > and all input. >> > Nathan KK4REY >> > >> > Sent using CloudMagic Email >> > [ >> https://cloudmagic.com/k/d/mailapp?ct=pi&cv=7.4.15&pv=9.1&source=email >> _footer_2 >> ] >> > _______________________________________________ >> > 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. > > > > -- > If this email is spam, report it to > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg0MTUzMTgyNTpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > > _______________________________________________ > 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. > >
-- Felix qui potuit rerum cognoscere causas. Lucky is he who has been able to understand the causes of things. Virgil ------------------------------- "Noli sinere nothos te opprimere" Dr. Don Latham, AJ7LL Six Mile Systems LLC, 17850 Six Mile Road Huson, MT, 59846 mailing address: POBox 404 Frenchtown MT 59834-0404 VOX 406-626-4304 CEL 406-241-5093 Skype: buffler2 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ 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.
