Re: [time-nuts] Ebay GPSDO for the price of shipping.

I always wandering about that "amoj" logo. Some time ago I got Oscilloquarz 8663 OCXO soldered to PCB with this logo. It has two sinus and two square outputs, basic power supply and trimmer to change the frequency. I could be wrong, but my impression is: the company creating useful items

Re: [time-nuts] Ebay GPSDO for the price of shipping.

On Tue, Mar 15, 2016 at 8:23 PM, Bob Camp wrote: > Hi > > Last time I checked Trimble and uBlox were separate outfits. If a gizmo > puts out > uBlox messages, it’s tough to believe it’s a genuine Trimble device. > Ah, Bob's eye for detail. I used to have one of those. This unit

Re: [time-nuts] Serial-Ethernet

On Thu, Feb 25, 2016 at 1:38 AM, Tom Van Baak wrote: > > And, if you have a couple of 422 devices, consider the economics of a 4-port > unit like: > > http://www.ebay.com/itm/301881123530 As promised, I am reporting on the USR-N540, 4-serial-port to Ethernet box that Tom

Re: [time-nuts] Ebay GPSDO for the price of shipping.

On Tue, Mar 15, 2016 at 7:43 PM, Paul wrote: > I got one of these: The GPSDO has been claimed. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

Re: [time-nuts] Ebay GPSDO for the price of shipping.

Hmm not to dissuade you from selling, but have you 'scoped the PPS on the RS-232/SMA outputs? My guess is you are seeing a very narrow pulse (uSecs) and need a pulse stretcher to actually do something like light a LED with it. Looks to be a nicely packaged unit. Dave -Original

Re: [time-nuts] Conditioning Rubidium Oscillators

They actually determine the phase offset and rate of change of phase (i..e. frequency offset and not frequency drift as claimed in the paper) from a linear regression fit to a sequence of phase differences. The results from the regression fit are then used in an adaptive PID loop. Bruce On

Re: [time-nuts] When does NIST change to DST?

> I'm still not certain when exactly the DST bits are first flipped by WWVB, > which I'd be curious to know. Hi Hank, It may be confusing to use the word "flipped" here -- because the algorithm is more complicated than a light switch or binary "DST or not DST". There are 2-bits and 4 states

Re: [time-nuts] Ebay GPSDO for the price of shipping.

Hi Last time I checked Trimble and uBlox were separate outfits. If a gizmo puts out uBlox messages, it’s tough to believe it’s a genuine Trimble device. Bob > On Mar 15, 2016, at 7:43 PM, Paul wrote: > > I got one of these: > >

Re: [time-nuts] When does NIST change to DST?

I've been recording the WWVB timecode output from a salvaged walmart clock module, so I examined the recent changes at bits 57 and 58. Looks like they got it exactly right. Here's the minute before and after. Midnight Saturday (UTC), they turned on bit 57 to indicate DST begins Sunday: Sat

Re: [time-nuts] For those of us that did the CPU upgrade for the 5370

Hopefully, they will have installed the U.FL connector on the WiFi board so that you can install the antenna outside the enclosure with a short coax cable. Besides, it's low power ;) Didier KO4BB On March 15, 2016 2:10:21 PM CDT, Poul-Henning Kamp wrote: > >In

[time-nuts] Ebay GPSDO for the price of shipping.

I got one of these: http://www.ebay.com/itm/Trimble-GPS-Receiver-GPSDO-10MHz-1PPS-GPS-Disciplined-Clock-with-rs232-port-/252162780444 but the PPS output is bad. Funny becaue the PPS LED is working just fine. The 10MHz looks okay (the counter says 10MHz with a Fury ext-in). This unit emits a

Re: [time-nuts] Conditioning Rubidium Oscillators

My understanding of the article was that although fairly simple control techniques such as PID were used, their innovation was to determine what function the loop was performing, (initial lock, stability, and transition from one to the other) and to choose a set of constants for loop control

Re: [time-nuts] When does NIST change to DST?

Just for fun, I was created the chart for 60hz main behaviour for the night when we had EST to EDT time switch. Its 2AM EST, Mar 13. Which is, I beleive 6AM UTC. I was surprised I noticed the event when I created spline smooth line for the data http://www.patoka.ca/OCXO/60hz-est2edt.png May

Re: [time-nuts] When does NIST change to DST?

Nick, Andy, There are hundreds of different WWVB RC clocks & watches, made by dozens of companies over the years. It turns out that many do not handle DST, leap seconds, or other boundary cases perfectly. I've never seen the problem caused by WWVB itself, though poor reception can contribute

Re: [time-nuts] Conditioning Rubidium Oscillators

On Mon, 14 Mar 2016 19:56:42 -0400 Jim Harman wrote: Disclaimer: Control theory is not my strongest topic. I am pretty sure that what I have written here is correct. But if anyone finds any mistakes, please correct me. > On Mon, Mar 14, 2016 at 2:37 PM, Lars Walenius

Re: [time-nuts] Symmetricom SA.35M Information Request

Ed, On 03/14/2016 10:10 PM, Ed Palmer wrote: Does anyone have any info on the Symmetricom SA.35M Miniature Rb Standard? I have the data sheet, patent document and the MACDEMO program. Is there anything else available? For example, I'd like some more explanation of the various parameters read

Re: [time-nuts] For those of us that did the CPU upgrade for the 5370

In message , Pete Lancashire writes: >http://linuxgizmos.com/beefed-up-beaglebone-black-clone-launches-on-indiegogo/ I'm not sure I'd want a WLAN transmitter inside my 5370... -- Poul-Henning Kamp | UNIX since

[time-nuts] For those of us that did the CPU upgrade for the 5370

http://linuxgizmos.com/beefed-up-beaglebone-black-clone-launches-on-indiegogo/ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] When does NIST change to DST?

Well, they flip the “warning” bit at 0h UTC (4PM PST the afternoon before), so I think the explanation is that my clock was able to sync up at that time, and it reacted to the warning bit rather than using that as a cue to make the change at 0200J like it should have. Either that, or the

Re: [time-nuts] Conditioning Rubidium Oscillators

I have seen no national timelab using cheap L1 stuff for high quality time transfer. Btw... its been discussed here multiple times over the years. Ashtech Z12-T and fast forward over the past 20years. Look at a geodetic receiver with optional external freq input. They are available from most

Re: [time-nuts] Conditioning Rubidium Oscillators

Hal, One point being missed here is that when you get to high-end, dual-frequency (L1/L2), carrier-phase GPS there's often less need for real-time results. The receivers are run more in a data logging mode. Many sites collect data continuously and then apply GPS corrections hours to days

Re: [time-nuts] Conditioning Rubidium Oscillators

In message <20160315031836.0f5b3406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu rray writes: >Tom Clark and Rick Hambly work on timing for VLBI. [...] They use low >cost L1 gear. The crux of this seems to be that getting better time information out of multiple bands *in real time* is

Re: [time-nuts] Symmetricom SA.35M Information Request

My unit was produced in Aug. 2010 so I don't think warranty is an option. Besides, they'd take a dim view of me removing the top! :) Ed On 2016-03-14 9:01 PM, time-nuts-requ...@febo.com wrote: From: Bob Camp To: Discussion of precise time and frequency measurement

Re: [time-nuts] When does NIST change to DST?

Yes, what I meant by "switch to DST" was that it flips the DST bit. Not that the timecode itself changes. Since the time many clocks use to sync up with WWVB is (from what I recall) around 2AM, it seems kind of dicey whether they would make the change on the right day. I think that doesn't