Will see you then thanks Sent from my iPod
On Jun 4, 2013, at 2:11 PM, [email protected] wrote: > Send time-nuts mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > > Today's Topics: > > 1. Re: 59503A GPIB clock windows/linux software. (Hal Murray) > 2. Re: Traceability after loss of LORAN and WWVB (Doug Calvert) > 3. Re: Cheap 9.8Mhz Sa.22c's (Angus) > 4. Cheap 9.8Mhz Sa.22c's (Skip Withrow) > 5. Re: 59503A GPIB clock windows/linux software. (Tom Van Baak) > 6. Re: 59503A GPIB clock windows/linux software. (Don Latham) > 7. Re: 59503A GPIB clock windows/linux software. (Hal Murray) > 8. Re: Traceability after loss of LORAN and WWVB (Jason Rabel) > 9. Re: Traceability after loss of LORAN and WWVB (paul swed) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 03 Jun 2013 16:13:21 -0700 > From: Hal Murray <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] 59503A GPIB clock windows/linux software. > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=us-ascii > > > [email protected] said: >> 2. i use the SCPI command ":ptime:time:str?" to read the time from the >> gpsdo. if i understand correctly, the resolution of the string is 1 sencond >> only. this would mean that if i read the time at Z + 0.9 seconds then i get >> Z and not Z+0.9s. this does not help much to synchronize the clock >> precisely with the GPSDO. or did i misunderstand something here (which is >> not very unlikely)? > > Even though the resolution of the clock is low, you can get an accurate > reading if you catch it rolling over from T to T+1. > > I'd make a loop that reads the time and counts how many times you get the > same answer. > > > -- > These are my opinions. I hate spam. > > > > > > ------------------------------ > > Message: 2 > Date: Mon, 3 Jun 2013 21:36:25 -0400 > From: Doug Calvert <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Traceability after loss of LORAN and WWVB > Message-ID: > <CACtKTD2Oav7GXDtNj5XLZdULLa=gjzgh3srcy6mes97j_cm...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > On Sat, Jun 1, 2013 at 3:02 PM, Scott McGrath <[email protected]> wrote: > > Since the demise of LORAN and WWVB (although d-PSKer may allow us to bring >> spectracoms and 117a's back. > > > What/Who is d-PSKer? > > > ------------------------------ > > Message: 3 > Date: Tue, 04 Jun 2013 01:43:22 -0000 > From: Angus <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Cheap 9.8Mhz Sa.22c's > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > > > ------------------------------ > > Message: 4 > Date: Mon, 3 Jun 2013 20:30:32 -0600 > From: Skip Withrow <[email protected]> > To: [email protected] > Subject: [time-nuts] Cheap 9.8Mhz Sa.22c's > Message-ID: > <CA+oSWyVJzR+5U7YDzDof6Y5jFXRMU_LheT+stHmuhW=uiwu...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > There is a crystal in the sa.22 that will determin what output frequencies > are available for output. On the 9.8MHz and 10MHz versions it is 6X the > nominal output frequency (58.x MHz vs 60MHz). The sa.22 can be programmed > to output xtal freq/2N for n up 2^16 (IIRC, it's in the manual). > > Thus, you can change 15MHz units (found on telecom boards) to 10MHz (n is > changed from 2 to 3). I have done this. But, you can't change 9.8MHz > (found on different telecom cards) units to 10MHz. > > Regards, > Skip Withrow > > > ------------------------------ > > Message: 5 > Date: Mon, 3 Jun 2013 20:46:23 -0700 > From: "Tom Van Baak" <[email protected]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Subject: Re: [time-nuts] 59503A GPIB clock windows/linux software. > Message-ID: <BB0F8A9B6F644F44B6CE29BA4F12EB06@pc52> > Content-Type: text/plain; charset="iso-8859-1" > >> Even though the resolution of the clock is low, you can get an accurate >> reading if you catch it rolling over from T to T+1. >> >> I'd make a loop that reads the time and counts how many times you get the >> same answer. > > Hal, > > The hp 59309A has a talk-only mode where timestamps are output at 40 Hz; so > that would narrow it down to 25 ms. > > BTW, if you're curious, look at the service manual > (http://ko4bb.com/manuals.php). This is a pre-microprocessor age GPIB > instrument that uses a 4096-bit ROM-based state machine (A5U2) as a CPU. Very > clever, very 70's. > > The 59309A is a wonderful, compact, vintage instrument, but my suggestion to > the OP is that it's not really suitable for use for precise time or NTP. > > /tvb > > > > ------------------------------ > > Message: 6 > Date: Mon, 3 Jun 2013 23:07:41 -0600 (MDT) > From: "Don Latham" <[email protected]> > To: "Tom Van Baak" <[email protected]>, "Discussion of precise time > and frequency measurement" <[email protected]> > Subject: Re: [time-nuts] 59503A GPIB clock windows/linux software. > Message-ID: > <[email protected]> > Content-Type: text/plain;charset=iso-8859-1 > > It also has an available BNC on the back, if you redo the the external > voltage in, and a couple of unused cmos buffers to give a 1 pps output. > Dob > > Tom Van Baak >> Lizeth Norman wrote: >>> The 59309A can be updated via HPIB. >>> I did it two ways. The first was to use windows system time and then >>> write >>> to the instrument. The other was to poll a M12+T and get the proper >>> time. >>> Sadly, both are in Labview, and as such probably aren't much help. >> >> Hans Holzach wrote: >>> i use a 59309A as a time and date display in a setup of old HP >>> devices: >>> 10 mhz are taken from a fury gpsdo to keep the clock stable. an HP 71B >>> reads the time from the gpsdo via an HP-IL/RS-232 interface and >>> delivers >>> it to the clock via an HP-IL/HPIB interface. setting the clock looks >>> pretty cool, there is quite some action on the display! the system is >>> so >>> slow, it takes several seconds until time and date are set. sorry, no >>> linux/windows involved here... >> >> Norm and Hans, >> >> Were either of you able to sync the 59309A to better than a second? From >> the schematic it looks like the P (stoP) and T (starT) commands have 1 >> second granularity and the R (Reset) command clears only the last >> MC14518 decade counter. This would suggest that one can set to within >> 100 ms, but no better. >> >> The code that I'm using (http://leapsecond.com/tools/hp59309.c) solves >> the 1 second problem but I wasn't able to get it to sync better than 0.1 >> second. If you have suggestions or solved this without a soldering iron, >> let me know. >> >> Thanks, >> /tvb >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > -- > "Neither the voice of authority nor the weight of reason and argument > are as significant as experiment, for thence comes quiet to the mind." > De Erroribus Medicorum, R. Bacon, 13th century. > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > Skype: buffler2 > www.lightningforensics.com > www.sixmilesystems.com > > > > > ------------------------------ > > Message: 7 > Date: Tue, 04 Jun 2013 03:33:21 -0700 > From: Hal Murray <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] 59503A GPIB clock windows/linux software. > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=us-ascii > > > [email protected] said: >> The hp 59309A has a talk-only mode where timestamps are output at 40 Hz; so >> that would narrow it down to 25 ms. > > You can get (much?) better than 25 ms if the timestamps are locked to the > master clock or PPS. > > If not, you can also get into hanging-bridge type adventures. :) > > >> BTW, if you're curious, look at the service manual (http://ko4bb.com/ >> manuals.php). This is a pre-microprocessor age GPIB instrument that uses a >> 4096-bit ROM-based state machine (A5U2) as a CPU. Very clever, very 70's. > > I was designing hardware back in those days, and writing microcode too. The > good old days really were "good", at least in my memories. > > If you get more than ballpark of 20 states in your state machine, it's often > simpler to think of the problem as software rather than hardware. That > probably works better if you have some experience writing microcode. > > At the hardware level, for the gear I worked on, each instruction had a > next-PC field. One trick was to implement branches by ORing bits into the > bottom bits of the next-PC. The assembler did most of the work. > > For anything bigger than roughly 20 states, we would write a real assembler. > That's not a lot of work if you start from a previous example. Just change > all the keywords and matching dictionary. > > 4096 is 512x8, 9 address bits and 8 data bits, so you get X bits of PC and > 9-X bits to branch on. You can get more branch bits by using a mux keyed off > some high-order PC bits or something like that. (That's more work for the > assembler, but the programmer doesn't have to think about it.) > > > > > > -- > These are my opinions. I hate spam. > > > > > > ------------------------------ > > Message: 8 > Date: Tue, 4 Jun 2013 08:03:28 -0500 > From: "Jason Rabel" <[email protected]> > To: <[email protected]> > Subject: Re: [time-nuts] Traceability after loss of LORAN and WWVB > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Short Answer (Long Answer is in the PDF): > http://www.febo.com/pages/wwvb_psk/WWVB%20d-psk-r%2003302013.pdf > >> What/Who is d-PSKer? > > > > ------------------------------ > > Message: 9 > Date: Tue, 4 Jun 2013 09:11:18 -0400 > From: paul swed <[email protected]> > To: Discussion of precise time and frequency measurement > <[email protected]> > Subject: Re: [time-nuts] Traceability after loss of LORAN and WWVB > Message-ID: > <cad2jfagkziwkyfnquo3psd_yyibny_vjwqvj6g4kbbasovx...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > d-psk-r is a unit that removes the new wwvb phase modulation so that > traditional/vintage phase tracking receivers can work. Its essentially a > costa loop for 60 Khz. Its not a kit and does work. But as with all things > homebrew can always use improvements. Search the time nuts archives the > infos all there. > > Paul > WB8TSL > > > On Tue, Jun 4, 2013 at 9:03 AM, Jason Rabel > <[email protected]>wrote: > >> Short Answer (Long Answer is in the PDF): >> http://www.febo.com/pages/wwvb_psk/WWVB%20d-psk-r%2003302013.pdf >> >>> What/Who is d-PSKer? >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > ------------------------------ > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 107, Issue 22 > ****************************************** _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
