Re: [time-nuts] Has anybody checked this? GPSDO in kit

tober 30, 2016 7:26 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Has anybody checked this? GPSDO in kit > e) Which is the antenna signal level (dBm) that this unit require > to operate properly?>> >>The antenna you referenced should be fine. I wou

Re: [time-nuts] Has anybody checked this? GPSDO in kit

e) Which is the antenna signal level (dBm) that this unit require to operate properly?>> The antenna you referenced should be fine. I would hazard to guess that antennas a re a whole separate topic. The gain should be fine. What you need is a clear unobstructed view of the sky. I am pretty

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Any pole mount outdoor antenna with a gain in the 20 to 30 db range should be fine with any of these units. Cable loss can be an issue if it is getting the net gain down below 10 db (antenna gain - cable loss). The frequency is 1.5 GHz Perfect, mine should have 3.5 + 26db. I will start with few

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Yes sorry, you are right it is at RS232 levels. -=Bryan=- From: time-nuts on behalf of Mark Sims Sent: October 30, 2016 10:48 AM To: time-nuts@febo.com Subject: [time-nuts] Has anybody checked this? GPSDO in

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi Any pole mount outdoor antenna with a gain in the 20 to 30 db range should be fine with any of these units. Cable loss can be an issue if it is getting the net gain down below 10 db (antenna gain - cable loss). The frequency is 1.5 GHz so a quick look at the standard tables should give you an

Re: [time-nuts] Has anybody checked this? GPSDO in kit

ime-nuts <time-nuts-boun...@febo.com> on behalf of Giuseppe Marullo <giuse...@marullo.it> Sent: October 29, 2016 11:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Has anybody checked this? GPSDO in kit I ended up buying a pre-cooked Trimble plus a mi

Re: [time-nuts] Has anybody checked this? GPSDO in kit

I ended up buying a pre-cooked Trimble plus a missilehead-like GPS antenna: http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649=STRK%3AMEBIDX%3AIT http://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649=STRK%3AMEBIDX%3AIT This should limit the chance it would be a DOA(well

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Mark in your experience with these units, are the Trimble units adjustable in any way with regards to the oscillator such as damping, time constant etc. I had a Symmetricom unit but accidently fried it so could not experiment any further. I could not find any command that would allow any fine

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hello Attila, not cheap at that point, and I already have that ST board(I live few km from ST headquarters, BTW)!. Still licking my wounds from Eclipse-whatever chaintool, ouch, no way I am going to mess with that again anytime soon. I am not in the mood to start another endless project,

Re: [time-nuts] Has anybody checked this? GPSDO in kit

measurement Subject: Re: [time-nuts] Has anybody checked this? GPSDO in kit Hi There is a *long* list of information on that unit over on EEVBlog. Bottom line is that if you get a good one (you may not) it is a *much* better solution than the other one you are looking at. Bob > On Oct 23

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Nice! (I had one of those, 20 years ago . . . .) 73, Jim wb4...@amsat.org On 10/23/2016 1:49 PM, William H. Fite wrote: Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train so complex it has to go in every 3000 miles for an oil change. On Sunday, October 23, 2016,

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train so complex it has to go in every 3000 miles for an oil change. On Sunday, October 23, 2016, Wes wrote: > On 10/22/2016 9:22 AM, Chris Albertson wrote: > >> >> You have to remember what this thing

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On Sun, 23 Oct 2016 15:32:33 +0200 Giuseppe Marullo wrote: > I am puzzled about what to do, still the total cost of it for a OXCO + > GPS(unit with antenna) + control mcu is 67usd, I doubt I could find > anything like this for a cheaper price new. Yes, it's cheap for a

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On 10/22/2016 9:22 AM, Chris Albertson wrote: You have to remember what this thing replaces. In ham radio, some people are using vacuum tube oscillators with mechanical variable capacitor tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to allow more exact tuning This

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi There is a *long* list of information on that unit over on EEVBlog. Bottom line is that if you get a good one (you may not) it is a *much* better solution than the other one you are looking at. Bob > On Oct 23, 2016, at 9:32 AM, Giuseppe Marullo wrote: > > Thanks to

Re: [time-nuts] Has anybody checked this? GPSDO in kit

I've been very impressed by the LED/VFD car clocks that come built into cars for the past 20 years. They have to work in temperature extremes from below zero to way above 120F when parked in the sun on a hot day. And every six months at DST time when it's time to reset them, I find they are never

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Thanks to all that have answered, as usual very good advices. I am puzzled about what to do, still the total cost of it for a OXCO + GPS(unit with antenna) + control mcu is 67usd, I doubt I could find anything like this for a cheaper price new. Only cheap alternative could be this

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi You *could* calibrate the nominal frequency a chip very cheaply these days. They may / the may not, who knows. It certainly *is* done that way on very low cost wrist watches. I’d bet that they do and it leaves the factory set within less than 1 ppm. A good generic crystal is still going

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi The bigger issue with doing a “home brew” OCXO is getting crystals with known turn temperatures in a reasonable range for the project. Yes, you can build gear to do temperature runs on crystals and sort bags full of them. It’s likely that your whole bag of 5,000 came from the same bar and

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On Sat, 22 Oct 2016 10:34:53 -0400 Tim Shoppa wrote: > I just went and visited their website, and see they also offer a "kit OCXO" > from mostly through-hole parts and PCB. The OCXO insulation box is made out > of PCB, the thermostat is simply a jellybean TO92 transistor, and

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On 22 October 2016 at 17:22, Chris Albertson wrote: > > You have to remember what this thing replaces. In ham radio, some people > are using vacuum tube oscillators with mechanical variable capacitor > tuning. Maybe some advanced rigs use gear drive on the capacitor

Re: [time-nuts] Has anybody checked this? GPSDO in kit

You need to catch up on what hams are REALLY using. On Saturday, October 22, 2016, Chris Albertson wrote: > > Unfortunately, it could be *lots* worse (like many orders of magnitude > > worse). It all depends on which parameter you > > are looking at and how much you

Re: [time-nuts] Has anybody checked this? GPSDO in kit

I just went and visited their website, and see they also offer a "kit OCXO" from mostly through-hole parts and PCB. The OCXO insulation box is made out of PCB, the thermostat is simply a jellybean TO92 transistor, and the 27MHz crystal is an AT-cut being operated around 45C, so nothing awful

Re: [time-nuts] Has anybody checked this? GPSDO in kit

> Unfortunately, it could be *lots* worse (like many orders of magnitude > worse). It all depends on which parameter you > are looking at and how much you want to add on to it. Phase noise and > second to second stability are two areas that > it is likely to have problems. > You have to remember

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On Sat, Oct 22, 2016 at 7:02 AM, Giuseppe Marullo wrote: > > I just need a clean/self-calibrating 10MHz reference to tune HF radios > ...seems good enough for the price. > For HF this thing is more useful than a 10MHz reference because it can directly output any frequency

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi > On Oct 22, 2016, at 10:02 AM, Giuseppe Marullo wrote: > > Hello, > > I know, I know it is not supposed to be high end stuff(timenutted), but I was > looking for a GPS clock and noticed that this could be a cheap GPSDO too: > > http://qrp-labs.com/progrock.html > >