Re: [time-nuts] CGSIC: FW: New NANU 2014090

On Dec 17, 2014, at 1:38 PM, Jim Lux wrote: > but there probably are some software receivers (open source?) out there.. I'll add to the list: Fellow time-nut Peter Monta's GNSS Firehose The

[time-nuts] GPS/SDR project design feedback needed

Hi group, Please email any follow-up to me directly, and not to the list, unless it is relevant to the GPS aspect. My little GPS / SDR add-on board project for the BeagleBone Black (GPS front-end + FPGA + ADC) is ready for first PCB fab. But I'd like to get some feedback on the design before I

Re: [time-nuts] End of Loran-C in Europe confirmed.

> 8000, 5990, 5960, 7950 (Russia) > 8830 (Saudi) > 6000, 6780, 7430, 8390 (China), > 9930 (Korea) > 8970 (USA occasionally) > > All the best, > Markus (DF6NM) > > > > -Ursprüngliche Mitteilung- > Von: John Seamons > An: markusveste

[time-nuts] Loran-C Norway/France/Germany shutdown

Looks like Sylt went off-air in addition to the Norway and France stations. Perhaps it is not a permanent decommissioning. http://www.jks.com/signals/loran/LV.shutdown1.jpg The above capture from the Loran-C Live Grabber site of Markus Vester, DF6NM: http://www.df6nm.bplaced.net/LoranView/LoranGr

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

On LoranView (http://www.df6nm.bplaced.net/LoranView/LoranGrabber.htm) you can easily see various outages on Anthorn beginning at about 1500Z 4-Jan. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mail

[time-nuts] software-defined WWVB receivers

As a starting point: Here's an extension of the SAQrx PC sound card receiver that supports 192 KHz sample-rate sound cards. Enough to get you WWVB. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

[time-nuts] 5370 processor boards available

Please excuse this commercial announcement (although it is a near-zero profit endeavor). I am now accepting general orders for the hp 5370 processor replacement board. More info and ordering information at: ___ time-nuts mailing list -- time-nuts@febo.

Re: [time-nuts] 5370 processor boards available

I may have a solution for the power-off problem that doesn't involve batteries or supercaps. It has the added advantage of providing instant-on. I need to run some tests.. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://w

Re: [time-nuts] 5370 processor boards available

On Feb 25, 2014, at 12:59 PM, John Seamons wrote: > I may have a solution for the power-off problem that doesn't involve > batteries or supercaps. It has the added advantage of providing instant-on. >From the latest documentation: "One solution to the annoyance of hav

Re: [time-nuts] 5370 processor boards available

On Feb 28, 2014, at 4:34 PM, Bob Camp wrote: > Is there any performance data on how the card does with a 5370A and / or a > 5370B compared to the original CPU on the exact same box? Put another way - > does the counter get better or worse with the new card? I realize that an A > will do some

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

On Mar 2, 2014, at 6:20 AM, Brian Lloyd wrote: > Instead of using the external reference input, any thoughts on actually > disciplining the internal OCXO to bypass the problem? I almost put a GPS front-end chip and small FPGA on the 5370 board. You can imagine where that idea was going. I mean,

Re: [time-nuts] Why using HP5370 ext-ref is (maybe) a bad idea

On Mar 2, 2014, at 7:05 AM, Pete Lancashire wrote: > Idea. On the next go around for the board put the copper down and holes for > a couple small daughter cards and any support logic needed to interface > with the BBB. > The the only additional cost would be limited to the daughter board I/O > s

Re: [time-nuts] Beaglebone´s PRUs

If you're looking for example code that uses the BeagleBone PRU: The 5370 processor replacement project uses the PRU to meet real-time requirements accessing the 5370 and Beagle GPIOs (basically, by staying away from Linux). The code shows how to communicat

Re: [time-nuts] WWVB for Time Nuts

On Aug 10, 2014, at 5:49 AM, Brooke Clarke wrote: > I don't understand how Xtendwave can get patents when their work was > partially funded by NIST? We had this discussion a few years back: ___

[time-nuts] 2nd hp 5370 processor board build

Please excuse this commercial announcement (although it's still a near-zero profit project). There has been enough accumulated interest for me to consider doing a second build of the 5370 processor replacement boards. If you are interested, but have not previously done so, please fill-out the f

[time-nuts] 5370 processor boards available

Boards from the second build of the 5370 processor replacement board project are now available. Details here: Please email me off-list with any non general-interest questions. Thanks, John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscri

Re: [time-nuts] 5370 processor boards available

On Oct 8, 2014, at 8:00 AM, Chuck Harris wrote: > Is removing the HPIB connector "the way"? > > Is anyone making a replacement panel that has a USB > and an RJ connector mounted? I have looked into the mechanical issues of doing that, but haven't done a PCB layout yet. My plan was to include

Re: [time-nuts] 5370 processor boards available

On Oct 8, 2014, at 6:46 AM, Chuck Harris wrote: > Can you share with the group any interesting applications this > new processor board has enabled? I haven't done much of interest beyond the high speed binary-mode-over-Ethernet hack (about 39K meas/sec last time I checked). I'm not even sure ho

Re: [time-nuts] 5370 processor boards available

On Oct 8, 2014, at 1:36 PM, "Tom Van Baak" wrote: > Time-stamping is wonderful. But note -- it does not imply using NTP! Best to > time-stamp with some sort of fine nanosecond or picosecond XO or OCXO or Rb > or Cs or GPSDO -- and not against the gross millisecond or microsecond PC / > SBC /

Re: [time-nuts] Where the 5370's are...

On Oct 18, 2014, at 3:48 PM, Mark Sims wrote: > It is rather interesting that well over half have gone international … Agreed. I have shipped processor boards to Canada, UK, Netherlands, Denmark, Sweden, Spain, Germany, Australia, Brazil, Italy and maybe South Africa if their post office stri

Re: [time-nuts] Leap second coming...

Even the LHC doesn't trust leap second effects. A slide from Friday morning's status report: "https://dl.dropbox.com/u/68809050/2012.06.29-830meeting.pdf"; ("start-up" referring to the recovery from this week's technical stop) ___ time-nuts mailing li

Re: [time-nuts] WWVB and Free Democracies Survival

"http://www.fhwa.dot.gov/publications/publicroads/01septoct/gwen.cfm"; "http://www.navcen.uscg.gov/?pageName=SiteLocations"; "http://www.navcen.uscg.gov/pdf/ndgps/DGPS_Site_Table.pdf"; The only ones I know for a fact were former GWEN sites are Essex CA and ABQ NM. I can hear 29 +/- of these with a

Re: [time-nuts] WWVB and Free Democracies Survival

I can't seem to remember it's angle brackets you use to quote a url. Sorry about that for those of you reading on the archive and getting bad links. Try below: On Jul 15, 2012, at 1:42 PM, John Seamons wrote: > <http://www.fhwa.dot.gov/publications/publicroads/01septoct/g

[time-nuts] Raw GPS signal samples

Somewhat off-topic but it might help someone out: I've had a tough time finding, and using, files on the net containing raw GPS signal samples to be used with the various software-only (or software-mostly) GPS receivers out there. I finally got a file of data that works and have have posted it p

[time-nuts] Raw GPS signal samples

Somewhat off-topic but it might help someone out: I've had a tough time finding, and using, files on the net containing raw GPS signal samples to be used with the various software-only (or software-mostly) GPS receivers out there. I finally got a file of data that works and have have posted it p

Re: [time-nuts] Raw GPS signal samples

On Sep 5, 2013, at 9:05 AM, Tom Van Baak wrote: > Hi John, > > It's not off-topic at all. Thanks for posting. Someday it would be cool if an > amateur precise time project emerged from this effort. > > What is not clear from your link is the accuracy or stability of the LO that > was used. It

Re: [time-nuts] HP3048 RMB software

On Sep 13, 2013, at 6:03 AM, David Hooke wrote: > Does anyone have a secret stash of the RMB A.03.0x version? I don't have that. But what I do have that might be of interest to someone is the source code (BASIC) for the older 3047A system (11740A/35601A). I have uploaded it to KO4BB (give Didie

[time-nuts] Software-defined GPS receiver: the breadboard

For your amusement: A version of Andrew Holme's SD-GPS built using a BeagleBone Black + LX25 FPGA + SE4150 GPS front-end chip. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo

[time-nuts] beta tester need: hp5370 processor replacement project

Please do not reply to the list -- send me an email. I need one (just one) additional beta tester for the hp5370 processor replacement project: http://www.jks.com/5370/5370.html Ideally you'd be able to write some C code that extends the instrument to do something interesting for the time-nuts c

Re: [time-nuts] beta tester needed: hp5370 processor replacement project

Okay, the board has been spoken for. Thanks for your interest. I will soon post gerbers and source so you can build one yourself if you want. We should also figure out how to get a larger number of boards made if there is sufficient interest. ___ time-

Re: [time-nuts] beta tester needed: hp5370 processor replacement project

Since I'm getting a bunch of replies let me ask that you please answer a question in your emails. Please indicate: 1. Just publish the gerbers and source and I'll deal with it myself. 2. I want to buy a blank PCB (no components). 3. I want to buy a finished PCB and I'll bu

[time-nuts] 5370 project now on github

https://github.com/jks-prv/5370_proc Source code, documentation, Gerbers, BOM, KiCAD schematic and PCB layout. I'm new to github so please let me know of any screwups. I decided to pull the USB isolation stuff off the board since it's pricey and uncertain when it might be working with the BBB.

Re: [time-nuts] WWVB phase modulation format?

On Mar 9, 2012, at 4:28 PM, Peter Monta wrote: > Interesting that WWVB is running a phase-modulation test---thanks for > the links. Is the signal format known? A quick search shows nothing > specific, just "we're testing". > > Could someone record a few minutes of the broadband signal so that >

Re: [time-nuts] WWVB phase modulation format?

On Mar 11, 2012, at 12:53 PM, John Seamons wrote: > I took a look at this. Pictures and video here: http://jks.com > > I believe what they were doing is applying a simple 180 deg phase shift to > the carrier (BPSK) during certain one second timecode intervals. > Whether the

[time-nuts] NIST's WWVB phase modulation format paper from PTTI 2011

Here is a copy of the paper NIST co-authored describing the new WWVB phase modulation format: http://jks.com/wwvb.pdf (2MB PDF) John Lowe from NIST said I could redistribute it to the list. It will be available on the NIST website sometime in April once the official PTTI 2011 proceedin

Re: [time-nuts] WWVB phase plots

On Mar 16, 2012, at 1:32 AM, Peter Monta wrote: > Attached are some more renderings of John Seamons' WWVB data. This is > what one might expect from a receiver that knows when the phase > reversals happen and takes them out noiselessly---re-reversing the > out-of-phase bur

Re: [time-nuts] WWVB phase plots

On Mar 20, 2012, at 4:18 AM, Peter Monta wrote: > John, if you're reading this, would your receiver be capable of > recording with wider RF bandwidth? Your recordings made during the > test period have a bandwidth of about 30 Hz; can it go any wider? I > think your web page says you're using an

Re: [time-nuts] WWVB phase plots

On Mar 20, 2012, at 4:18 AM, Peter Monta wrote: > John, if you're reading this, would your receiver be capable of > recording with wider RF bandwidth? Okay. A little 3586B hacking was required, but here are some wide-band results: __

Re: [time-nuts] WWVB phase-modulation test

On Apr 14, 2012, at 7:05 PM, Jim Hickstein wrote: > Did they start early? Both my Spectracom 8164 and 8170 are unlocked. I was > expecting this, but not before 0130Z. The transmitter went off-air starting at 0100Z. Back on now at 0130 presumably with PSK. I'm recording, but haven't done any d

[time-nuts] WWVB test: some results

It appears that, like last month's test, the phase data pattern transmitted is constant and repeats every minute. The pattern is different than last time however: +-- sec 0 v April 15 2012 1001100101 010011 111000 1110101100 0010111000 1101101000 <-- sec 59 101100 100111 100

Re: [time-nuts] Rom Expansion for HP5370B

I've been looking at this a bit recently. Pictures here: http://jks.com I run the 5370 firmware on an m6800 emulator written in C running on a Linux box. Reads and writes to I/O space are caught and executed on the 5370 hardware via an interface board hooked up to the m6800 processor bus. This

Re: [time-nuts] Rom Expansion for HP5370B

> Have you tried going through the various checkout procedures in the manual > to make sure they all still work? If the 5370 firmware authors *didn't* > bake some timing dependencies into that 6800 code, they were the exception. > Of course, if your emulator is cycle-for-cycle faithful to the 6800

Re: [time-nuts] Rom Expansion for HP5370B

> Perhaps an AT91SAM7SE512 - it has an external addr/data bus, with quite > flexible configuration, and USB - but no Ethernet :) > Regards, > Javier One thing I like about the SAM7X512 (and others) is that in exchange for giving up the external bus interface you get USB -and- Ethernet. The m6800

Re: [time-nuts] Rom Expansion for HP5370B

On Feb 21, 2011, at 10:38 AM, Poul-Henning Kamp wrote: > In message , John Seamons > writes: > >> It's bad enough to have to solder a single LQFP-100.. > > Why even try ? There are plenty of good eval boards from olimex.com > (sparkfun.com in the USA) >

Re: [time-nuts] Rom Expansion for HP5370B

Well the hard part (or maybe the fun part) is still to come. I wasn't going to talk about any of this until I had a board to sell, but this thread sort of forced the issue, lol. On Feb 21, 2011, at 12:14 PM, jimlux wrote: > On 2/20/11 8:55 PM, John Seamons wrote: >> I've bee

[time-nuts] 5370 firmware hacking status report

Some progress since February's discussion: My m6800 emulator running the 5370 firmware has been moved from the Linux box to a little 32-bit microcontroller on it's own small evaluation-kit board. Pictures here: http://jks.com (click on images for larger versions) You talk to it over an Ethernet

Re: [time-nuts] 5370 firmware hacking status report

On Jul 24, 2011, at 12:32 AM, Poul-Henning Kamp wrote: > I would worry a bit about the PLL locking too, but I have no idea how > to actually measure it. > > I think the 1sec max gate-time is related to the eventcounter width, > but it might be possible to simulate a wider counter in software. >

Re: [time-nuts] 5370 firmware hacking status report

On Jul 24, 2011, at 11:18 AM, paul swed wrote: > Took a look at your setup and bench. So the support for the 5370 in a HP > vector network analyzer. Now thats some support. :-) I might tend to have > the two flipped in the stack. > So you are suggesting the potential to make this operational to a

Re: [time-nuts] 5370 firmware hacking status report

On Jul 24, 2011, at 2:40 PM, Poul-Henning Kamp wrote: > Ethernets big advantage is that it is galvanically isolated, USB is not. You had mentioned this issue in February. And since I currently flash using USB I went ahead and bought the evaluation card for the Analog Devices ADuM4160 power/sign

Re: [time-nuts] 5370 firmware hacking status report

On Jul 25, 2011, at 2:32 PM, Tijd Dingen wrote: > A quick check shows digikey sells them in single quantities, and has current > stock. Good news. I hadn't checked for five months, but maybe my original search was faulty. Funny that they're $1.40 more expensive than the microcontroller ($10 vs

[time-nuts] 3047a/11740a 35601a firmware

I have the 3047a BASIC firmware files (dated 1/16/1986) that were coded to run on the hp 9835 calculator and control the 3582/3585/35601 over HPIB. Some kind soul sent them to me over 10 years ago after I had acquired a 35601a. The plan was to whack it for IBASIC in the 4395 SA and display the PN g