Re: [time-nuts] Trimble Thunderbolt GPSDO Troubleshooting

All, Yay progress (one step forward into the next wall). I got the MAX232 chip replaced with a MAX202 (pin compatible, better ESD and Latchup protection). That got the serial working, and I was able to watch the unit do a survey, and then confirm it saw that the Osc was off by ~ -2700ppb, and

[time-nuts] Databooks now on KO4BB site

Thanks to Walter for the databooks and Didiers work to grab and then organize them on the KO4BB site they now have another great home. The Sphere documents are on line. " http://www.ko4bb.com/getsimple/index.php?id=manuals=09_Components_Specs_Datasheets/Databooks_from_Sphere " Regards Paul

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Inversion of gain isn't required, the system will just lock on the opposite slope of the phase detector output. Level shifting to accommodate different EFC ranges nay be useful however. Bruce On Tuesday, 29 March 2016 1:12 PM, Magnus Danielson wrote: Hi

Re: [time-nuts] Prescaler

Dave, my counter is a 5328A with channel C to 500 MHz.  It actually counts well to about 700 MHz. Yes I would like a copy of that article; my email is bob91343 at yahoo dot com.  I will also check out the ebay references to boards; I hadn't seen those. Thanks for the help! Bob On Monday,

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Oleg, I like the simplicity here. Would not GNUradio be a good platform to encode the calibration stuff a little more gift-wrapped? What spectrum-analyzer software do you use? (Just curious) This simple setup would be useful for many purposes. Depending on the oscillator, the EFC can

Re: [time-nuts] Lucent GPS UTC confusion

Hi, Actually, most systems these days wants UTC rather than GPS time. Cheers, Magnus On 03/17/2016 02:42 AM, Bob Camp wrote: Hi The CDMA world (and most systems) want GPS lock rather than UTC. The only real change is likely in the status messages. I strongly suspect that a “UTC locked”

Re: [time-nuts] Time Lord, video of

He is indeed a nice guy. I'm scheduled to speak directly after him at IFCS in may... oups. He has a nice topic thought, 50 years of Allan Deviation. Pitty I was unable to complete my article relating to that topic, will have to resurrect that one eventually. Cheers, Magnus On 03/04/2016

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

That's probably a good example of how not to do it well. 1) The chosen mixer isnt as low noise as the various Minicircuits phase detectors. 2) The 50 ohm load after the filter merely serves to halve the phase detector gain. The IF port is terminated by a 15nF capacitor at RF and LO frequencies

Re: [time-nuts] Prescaler

Good catch on that board, Ignacio. I didn't read the complete description before posting. Given that it seems to be a 1-board solution, I might buy one and see how it turns out. My frequency counting capabilities are limited to 1.3 GHz right now, as is my signal generation capabilities, so I

Re: [time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi, everybody! OK. Let's start. Here is the schematics of the "test set" http://skydan.in.ua/PNTestSet/PN%20Test%20set.pdf . It consists of three small boards: 1. Mixer board - a simple mixer (500MHz ADE-1+) with 200kHz pi-LPF at the mixer output. 2. LNA board - a non-inverting low noise AF

Re: [time-nuts] A new member & PN test set

Hi Oleg, I'm interested in your PN test set. I'm sure a number of us are. If you have webpages or documents up, could you share them with the list? Otherwise, could you email me direct?bob at evoria dot net Bob On Sun, 3/27/16, Oleg Skydan

[time-nuts] Oleg' s PN test Re: A new member & PN test set

Hi Oleg, " If somebody is interested I can share all the information about it. " Yes I would be very interested to see your phase noise test at least the principle 73 KJ6UHN Alex On 3/28/2016 6:49 AM, Magnus Danielson wrote: Hi Oleg, Welcome. As always, it's a combination of tools,

Re: [time-nuts] Spectrum Analyzer Specifications [Phase noise tester Bare Boards and Layout]

On 3/24/2016 1:08 PM, Bob Bownes wrote: > Don't really need anyone who can order up bare boards in bulk anymore. Oshpark; www.oshpark.org does 2 layer for $5/sq in and 4 layer for $10/sq. That price gets you three boards. Designs can be made public so anyone can buy them. I buy from them all the

Re: [time-nuts] A new member & PN test set

Hi Oleg, I'd be interested in seeing more information about your phase noise measurement setup. All the best Mark Spencer VE7AFZ Sent from my iPhone > On Mar 27, 2016, at 1:25 PM, Oleg Skydan wrote: > > Hi list, > > I am in a process of making a low noise frequency

Re: [time-nuts] A new member & PN test set

Hi Oleg, Welcome. As always, it's a combination of tools, experiments and theory which over a number of iterations develops into skills. You will notice that there is quite a bit of hams here too, some just forget to give their signals. 73 de SA0MAD Magnus On 03/27/2016 10:25 PM, Oleg

Re: [time-nuts] A new member & PN test set

Yes interested in what you are doing as to measuring phase noise. Rob, NC0B Sent from my iPad > On Mar 28, 2016, at 3:01 AM, "Oleg Skydan" wrote: > > > > Hi list, > > I am in a process of making a low noise frequency synthesizer for the 1st LO > for my new DSP HF

Re: [time-nuts] A new member & PN test set

On Sun, Mar 27, 2016 at 11:25:36PM +0300, Oleg Skydan wrote: > Hi list, > I am in a process of making a low noise frequency > synthesizer for the 1st LO for my new DSP HF transceiver > (http://neon.skydan.in.ua). This list is not directly > related to my project, but I found a lot of useful >

Re: [time-nuts] high rev isolation amps

Hi John, This would indeed be interesting. I would assume that one would like to have shielded boxes for these. Cheers, Magnus On 03/27/2016 04:33 AM, John Ackermann N8UR wrote: In light of this discussion, I'm taking a deep gulp to mention a project that's finished but has been on my back

Re: [time-nuts] Reliability of atomic clocks

On 3/27/16 8:20 PM, Mark Sims wrote: Mil-spec parts would be somewhat more reliable than commercial parts. Actually, that is seldom true. The main difference between mil-spec parts and commercial parts tends to be in the post-packaging device testing (e.g.. extended temperature / voltage

Re: [time-nuts] Meaning of MTBF (was: Reliability of atomic clocks)

It's been a while since I designed aerospace hardware, but seems I remember we had both a calculated AND a demonstrated MTBF. Back then we called it Mil-Std 781. (I am sure it morphed into more modern tests). We had both a pre-production qual-test and a production acceptance-test, both

Re: [time-nuts] Meaning of MTBF (was: Reliability of atomic clocks)

We make some thick film, plastic molded , plug in attenuators for the cable TV industry. We have been asked on several occasions to provide MTBF data. Being a small company with limited resources, we have never been able to provide that data. The parts we make will easily outlast the equipment

Re: [time-nuts] Framework for simulation of oscillators

Hi Tom, On 03/28/2016 04:25 AM, Tom Van Baak wrote: BTW: I discovered that Timelab stops processing after 10'000'000 datapoints, which is kind inconvenient when doing a long term measurment... Attila Kinali I've collected a day of TimeLab/TimePod data at tau 0.001 which is 86'400'000

Re: [time-nuts] Framework for simulation of oscillators

> > BTW: I discovered that Timelab stops processing after 10'000'000 datapoints, > > which is kind inconvenient when doing a long term measurment... > > I didn't know that. Good to know. Attila, wasn't this related to an invalid ':' character in the filename coming through from VirtualBox? Or

Re: [time-nuts] Framework for simulation of oscillators

Hi > On Mar 27, 2016, at 9:23 PM, John Miles wrote: > >> BTW: I discovered that Timelab stops processing after 10'000'000 datapoints, >> which is kind inconvenient when doing a long term measurment... > > It had better not! :) Any steps to reproduce? > It’s never stopped

Re: [time-nuts] Prescaler

On Sun, Mar 27, 2016 at 07:45:23PM +, Bob Albert via time-nuts wrote: > Does anyone know of an inexpensive prescaler for a counter > that goes beyond 2 GHz?  A few years ago, I was looking for something cheap to build a PIC based GHz counter and I stumbled over the LMX23xx chips from TI

Re: [time-nuts] Prescaler

The first reference is a board for a two stage divider. They mention that a /2 and a /5 chips can be combined, so you can make a /10 prescaler. Regards, Ignacio, EB4APL El 27/03/2016 a las 23:24, Dave M escribió: Bob Albert via time-nuts wrote: Does anyone know of an inexpensive prescaler

Re: [time-nuts] Framework for simulation of oscillators

Goddag Attila, On 03/28/2016 01:48 AM, Attila Kinali wrote: N'abend Magnus, On Tue, 22 Mar 2016 01:11:41 +0100 Magnus Danielson wrote: Yes, of course. Noise is generally not i.i.d. and thus one cannot use the same generator for more than one model in the same

Re: [time-nuts] Reliability of atomic clocks

Am Mon, 28 Mar 2016 03:20:14 + schrieb Mark Sims : > > Mil-spec parts would be somewhat more reliable than commercial > > parts. > Actually, that is seldom true. The main difference between mil-spec > parts and commercial parts tends to be in the post-packaging device

Re: [time-nuts] Meaning of MTBF (was: Reliability of atomic clocks)

Am Mon, 28 Mar 2016 01:32:03 +0200 schrieb Attila Kinali : > Yes, the MTBF is a very simplicistic measure and there are a couple > of assumptions in its calculation which do not hold generally (or > rather, it's rather seldom that they hold). Yet it gives a number to > something

[time-nuts] Long measurements and Timelab (was: Framework for simulation of oscillators)

Moin, On Sun, 27 Mar 2016 19:25:30 -0700 "Tom Van Baak" wrote: > > BTW: I discovered that Timelab stops processing after 10'000'000 datapoints, > > which is kind inconvenient when doing a long term measurment... > I've collected a day of TimeLab/TimePod data at tau 0.001

Re: [time-nuts] Prescaler

Dennis, that looks interesting but it seems to be a complete counter.  I wonder if I could cannibalize it to get the important input circuitry adapted to my counter. Maybe some info on it is available; I'll take a look. Bob On Sunday, March 27, 2016 6:04 PM, Alexander Pummer

[time-nuts] A new member & PN test set

Hi list, I am in a process of making a low noise frequency synthesizer for the 1st LO for my new DSP HF transceiver (http://neon.skydan.in.ua). This list is not directly related to my project, but I found a lot of useful information in this list - thanks for all contributors! I see a discussion