Re: [time-nuts] OOPS on my wwv legal post

Hi John, While, tonight, I cannot cite chapter and verse without a lot of research, I notice you are at a premiere university and certainly have even greater resources than I to obtain chapter and verse. However, I can give you the historical basis for your research. Going back in time the

Re: [time-nuts] OOPS on my wwv legal post

On Wed 2018-08-29T21:41:26-0400 Bob kb8tq hath writ: > The whole issue of who is what goes back to some very obscure laws / rules > passed > quite a long time ago. It’s been a matter of debate (usually with beer > involved) for quite > a while. When I was a wee lad USNO was the legal time, and

Re: [time-nuts] OOPS on my wwv legal post

Hi The whole issue of who is what goes back to some very obscure laws / rules passed quite a long time ago. It’s been a matter of debate (usually with beer involved) for quite a while. Bob > On Aug 29, 2018, at 9:24 PM, Steve Allen wrote: > > On Wed 2018-08-29T19:49:59-0400 Bob kb8tq hath

Re: [time-nuts] OOPS on my wwv legal post

On Wed 2018-08-29T19:49:59-0400 Bob kb8tq hath writ: > A few more details about “traceability”. USNO is by statute the official > source of time for the US. I suggest reading Matsakis, Levine, and Lombardi from this year's PTTI meeting. USNO and NIST are both legal sources for the US. The USNO

Re: [time-nuts] WWVB Signal Generator

For those that have asked for my to publish the source code for my ATTiny85-based WWVB simulator, I have put up a somewhat hurriedly written page on my google site at: https://sites.google.com/site/wayneholder/controlling-time that describes a bit about how the code works, how to compile it

Re: [time-nuts] WWV and legal issues

Hi One of the basic disconnects here seems to be the idea that radio was the “best thing” before GPS came along. In fact that’s not really how it worked. Time was traced / coordinated by hauling atomic clocks on airplanes as the “best thing” before satellite systems came along….That was true

Re: [time-nuts] WWV and legal issues

Hi The same sort of massive solar flare that fiddles with sat systems also makes a mess of HF and VLF systems. You have a high level of correlation in the impact. That makes them a poor “backup” in this case. Bob > On Aug 29, 2018, at 7:52 PM, Scott McGrath wrote: > > Excellent point on

Re: [time-nuts] WWV and legal issues

A DIY radio distribution system is not secure and traceable to NIST/USNO even if the source is GPS. On Aug 29, 2018, at 7:52 PM, Scott McGrath wrote: Excellent point on LEGAL time, The problem is as always is GPS is the new shiny object. You mentioned earth based hostile actors. But a

Re: [time-nuts] WWV and legal issues

Excellent point on LEGAL time, The problem is as always is GPS is the new shiny object. You mentioned earth based hostile actors. But a really large solar flare or CME has the potential to take out or severely degrade ALL the GNSS systems. Something on the order of the ‘Carrington Event’

[time-nuts] WWV and legal issues

Yo Dudes!  WWV and all its variations distribute what in the USA is the legal standard of time (from USNO) and frequency (NIST).  If one is running a freq cal service IIRC it is a legal requirement to be able to have traceability to WWV. If one was to rely on other sources, one has no guarantee

Re: [time-nuts] WWVB Chronverter update progress

Mark OK I did indeed find what you suggested pretty neat most likely will order one and see whats what. That certainly simplifies old 60 KHz and in fact may be traceable. Pretty amazing. On Wed, Aug 29, 2018 at 11:39 AM, paul swed wrote: > Mark I looked at the 7 and the pulse out wasn't

Re: [time-nuts] WWVB Chronverter update progress

Hi Even when dividing from 48 MHz straight to 60 KHz, the uBlox is going to do a pulse drop / pulse add to keep things on frequency. For a wall clock that probably is not an issue. For a phase locking receiver it’s not quite as clear. The 60 KHz edge is going to hop by about 21 ns every so

[time-nuts] WWVB Chronverter update progress

The Ublox 7 has two programmable "timepulse" outputs. The default freqs are (I think) 1 PPS and 10 MHz.I don't remember if the Ublox 6 has one or two outputs... also some of the earlier Ublox receivers have limits on the range you can set the output(s) to (like 1 kHz). Lady Heather can

Re: [time-nuts] HP5065A Step Recovery Diode, what part#?

Hi: In addition to just the SRD there are things called "comb generator modules" that consist of a raw SRD diode (not in a package) and an input matching circuit, typically for 100 MHz, all housed in a hermetically sealed cylinder about 1/4" in diameter.  For example HP 33002, 33003 and

Re: [time-nuts] HP5065A Step Recovery Diode, what part#?

Hi all, Seems that two of my replies never went anywhere as the archives https://lists.febo.com/pipermail/time-nuts_lists.febo.com/2018-August/thread.html only shows my first email and your replies. Reposting: 1st post: Thanks for all the replies so far! Yes, I had to look up and get some some

Re: [time-nuts] HP5065A Step Recovery Diode, what part#?

Hi Corby et al, I've looked in service manuals for a few varied Rbs, and found only one that listed the SRD - it's like a secret! The one I found was SRS's PRS10 which used/uses Pulse Microwave's MP4025 but their input is 359MHz, rather than HP's 60MHz. It might work too but it's transition

Re: [time-nuts] IQRB-1 RBXO

Hi That basic design (though maybe not this exact part) has been kicking around for at least the last ten years. Various people have popped up reselling it. There are a lot of older Rb’s that are in the <2x10^-11 range at 1 second: http://www.ke5fx.com/rb.htm

[time-nuts] IQRB-1 RBXO

Got an e-mail from DigiKey this morning talking about this: https://www.iqdfrequencyproducts.com/products/pn/LFRBXO059244Bulk.pdf Unlike the other rubidium modules I’ve dealt with (which is to say, all FEI), this one claims to have under 1E-10 stability at tau 1s (specifically, if I’m doing

Re: [time-nuts] WWVB Signal Generator

Hi If somebody really wanted to go crazy on this, a link just popped up in my inbox: https://www.st.com/content/st_com/en/about/events/events.html/teseo-liv3f-gnss-module-webinar.html?ecmp=tt7108_us_enews_apr2018=stmDM10269=166175037=tEVjzOAFGOno6x6Htwrh8A==

Re: [time-nuts] WWVB Chronverter update progress

Mark I looked at the 7 and the pulse out wasn't obvious. Indeed at that cost it would be great if it did produce 60 KHz as it would eliminate the whole counter chain + power. The chronverter wants GPS data so its a nice answer. I have some 6s here so will start with that. Love low power and crazy

Re: [time-nuts] WWVB Chronverter update progress

Its a LPF and its not effecting anything. Square waves worked fine actually. But do want to be able to feed an antenna so a bit of filtering plus the loops stick should do the job. On Wed, Aug 29, 2018 at 9:16 AM, Bob kb8tq wrote: > HI > > If you are feeding “Time Nuts” gear, a fancy filter on

Re: [time-nuts] WWVB Signal Generator

Wayne always fun to see what others are doing and to learn. I would imagine the programs pretty small and could be attached here. How will you handle DST? Its a bit messy as a recent thread detailed. Plus the fact that god knows why politicians like to screw with it. Regards Paul WB8TSL On Wed,

Re: [time-nuts] WWVB Chronverter update progress

HI If you are feeding “Time Nuts” gear, a fancy filter on the output of the WWVB gizmo may be an issue. Temperature impacts the value of the components and that value change impacts the phase of the signal…. Bob > On Aug 28, 2018, at 9:33 PM, paul swed wrote: > > LPF filter added 2.2mH choke

Re: [time-nuts] WWVB Signal Generator

I hope that those of you who write code to generate the WWVB signals in real time from a GPS receiver's output will publish well documented source listings. I for one want to learn how one does this kind of thing in 'C', both for general interest and for this specific application. Thanks, Dana

Re: [time-nuts] WWVB Signal Generator

As a follow up, I now have a simple WWVB simulator written in C that's now running an an ATTiny85 using nothing more than the internal, 8 mHz oscillator and about a 6 inch length of wire connected to one of the pins as an antenna. It generates an approximate 60 kHz signal using PWM on timer 1. I