[time-nuts] time-nuts Digest, Vol 187, Issue 13
Christoph Guenther
chguenther1 at googlemail.com
Tue Feb 11 08:53:06 UTC 2020
Hi Chris,
>You might would want to try and calibrate the (T)ime (O)ffset as per
>page 32 of the Operation and Service Manual and then write that value
>with the TO! command.
Saving TimeOffset with user command only works from firmware version 3.23
and higher - mine is 3.21 and therefore only possible with a factory
command. But I think that's not necessarily the problem, but more important
is the TS parameter which should normally be around 14000.
Christoph
Am Mo., 10. Feb. 2020 um 18:00 Uhr schrieb <time-nuts-request at lists.febo.com
>:
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> Today's Topics:
>
> 1. Lady Heather Question (Don at True-Cal)
> 2. Re: Help with BG7TBL 2015-07-08 GPSDO>Fixed! (Patrick Murphy)
> 3. Re: Using a common power supply among few time standards
> (Taka Kamiya)
> 4. PRS10 (Christoph Guenther)
> 5. Re: PRS10 (Chris Burford)
> 6. Tbolt and LOCK indicator - is it there? (Taka Kamiya)
> 7. Re: eLoran (paul swed)
> 8. Re: Help with BG7TBL 2015-07-08 GPSDO>Fixed! (Gary Woods)
> 9. Re: Tbolt and LOCK indicator - is it there? (Bob kb8tq)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 9 Feb 2020 15:29:49 -0600
> From: "Don at True-Cal" <truecalservices at gmail.com>
> To: "'Discussion of precise time and frequency measurement'"
> <time-nuts at lists.febo.com>
> Subject: [time-nuts] Lady Heather Question
> Message-ID: <047f01d5df90$0fad7bd0$2f087370$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> I am using LH on a classic Thunderbolt (actually several) that uses the
> MV89
> OCXO retrofitted. I typically use a DAC TC of 1200-1800 seconds to really
> smooth things out. I want to do a LH 48-hr precision survey and have a
> couple of questions about that process. 1) Do I need to manually change
> the
> TC to something substantially lower so the forced position error offset
> scan
> results are more responsive or does LH make all necessary parameter changes
> before starting the process? 2) I have always been confused at the
> completion of the precision survey process rather I need to manually enter
> the coordinates last displayed in the screen log of does LH do this
> automatically? In other words, what exactly are the steps after the survey
> has completed? Thanks for any help.
>
> Don
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 9 Feb 2020 18:10:36 -0600
> From: Patrick Murphy <fgdhrtey at gmail.com>
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Help with BG7TBL 2015-07-08 GPSDO>Fixed!
> Message-ID:
> <CAG1UqTizi71enZ11Rj3hwrhwDT7QF8xPmL7biMB9ap=
> bZg6HEg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Great news! And even better sleuthing. I'm just curious - what piece of kit
> is the MAX3232 installed in? I'm trying to figure out is it is the DCE or
> the DTE end.
>
> Thanks!
>
> -Pat (KG5YPQ)
>
>
> On Sun, Feb 9, 2020 at 10:15 AM Gary Woods <garygarlic at earthlink.net>
> wrote:
>
> > Once I found the datasheet for the RS-232 interface, I found the TX
> > data was checking in but not out, and the circuitry that makes -V in
> > the MAX3232 wasn't working.
> > Replaced it * and all is well; Lady Heather is giving me nice maps of
> > satellites passing by, and 2nsec excursions on a graph. So now my
> > ancient Davis counter has a really really good timebase and I can
> > tweak my ham rig to within a fraction of a cycle of right. Hardly a
> > "time nuts" level of accuracy, but good enough!
> > Thanks, all!
> >
> > *Lengthy digresssion involving my Navy vocabulary omitted.
> >
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
> >
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 10 Feb 2020 05:11:23 +0000 (UTC)
> From: Taka Kamiya <tkamiya9 at yahoo.com>
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Using a common power supply among few time
> standards
> Message-ID: <1351448730.629365.1581311483259 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> I spent last two days boxing? up LPRO-101 into a 2U rack case.? It has Rb,
> dist amp, interface for LED, and EFC knob on front.? While doing so, I gave
> power supply concern I have been discussing careful thought.? I believe I
> came to something that is workable and fits my needs.?
>
> I started with 24V linear power supply (open frame type).? This is the
> only power supply in the box.? From there, it branches to Rb, a small dist
> amp, and a simple interface circuit.? Dist amp is 12V rated and interface
> is 5V.? I modified the dist amp by including a 3 terminal regulator.? Now,
> it's a 24V device.? I crated a 5V source right at Rb's interface board to
> be used as EFC power.? This is the only purpose of this branch.? I also
> created a separate 5V for the simple interface circuit. The reason for two
> 5V supply is that I didn't want to mix the source for EFC and digital
> circuit together.
>
> Pretty quickly, I found out going from 24V to 5V incurs huge loss
> resulting in heat and death of 3 terminal regulator for that branch.? EFC
> circuit was fine but digital interface board killed the regulator. Put a
> heat sink on it and issue is resolved.? A bit surprising but it shouldn't
> be....? The circuit only uses 25mA or so but voltage drop is huge.
> Basically, I'm doing the same thing S100 bus computers did.? I will have
> to consider use of small smp board for large voltage drops.? I didn't this
> time, as its noise profile is not known to me.? Can't really go wrong with
> linear regulators.? My only remaining concern is if regulator fails short,
> then what happens??? It will kill the particular device, which I'm fine
> with, but what else?? Perhaps simple fuse is in order for every branch.?
>
> This method is a lot simpler than hap-haphazardly creating multiple
> voltage at power supply and routing all over the place.? It became
> impossible to trace ground loops.? Above method makes it really easy as, as
> far as power supply is concerned, everything is a 24V device.
> Thanks everyone for discussions.? I learned a lot in this process.
> ---------------------------------------
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
>
>
> On Saturday, February 8, 2020, 9:52:02 PM EST, Charles Steinmetz <
> csteinmetz at yandex.com> wrote:
>
> Chris wrote:
>
> > How about using the open frame linear supplies like the ones from Power
> One or Lambda?
>
> I have had very good results with Deltron open-frame linear supplies.
> They have selectable mains voltage and low output noise (1mVrms/5mVp-p).
> ? I have used many (i.e., hundreds) of the Model W303E triple-output
> supply.? These have one, 5v/8A section and two sections, each selectable
> between 5v/12v/15v at 0.7A/1.7A/1.5A.? [*NOTE* there is an overall 55W
> output limit, so they will not do all of that at once.]? Each section
> can be adjusted +/- 5%.? These show up regularly on ebay.
>
> As for switchers, I have been satisfied with the performance of
> Integrated Power Designs (IPD) products.? [IPD is a different company
> than Power Designs, who made some of the best lab and bench power
> supplies of the 1960s through 1990s.]? One in particular may be of
> interest to time nuts: the Model SRW-65-4006.? This is a four-output
> supply (5v/5A, 24v/1A, and +/-15v/2A) [*NOTE* again, there is a 65W
> overall limit, so it won't do all of that at once].? It is available
> open-frame or with a chassis and cover.? For installation close to other
> circuitry, and particularly inside a piece of equipment, I strongly
> recommend the model with both chassis and cover (options CH and CO).
> Check ebay and look at distributors.
>
> Assume you will need to post-filter the switcher output, either with L/C
> filters or low noise linear regulators.? Note that I did not say "LDOs".
> ? I don't know why, but everyone seems to be stuck on LDOs these days.
> Active regulators (including LDOs) *always* perform better with more
> headroom (up to 4v or so).? The only excuse for designing LDO is if you
> have a gun to your head from a power budget you can't otherwise control.
> ? [Here, "LDO" is mostly a matter of how you use the part, not of its
> claimed capabilities -- "LDO" regulators work much better with at least
> 4v of headroom.]
>
> Best regards,
>
> Charles
>
>
>
> _______________________________________________
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>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 10 Feb 2020 10:10:37 +0100
> From: Christoph Guenther <chguenther1 at googlemail.com>
> To: time-nuts at lists.febo.com
> Subject: [time-nuts] PRS10
> Message-ID:
> <CAApZC99wwWSuKJ-r7p3pm7=w6m-t_K1qj1p0GVtURYqJD0+m=
> Q at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> PRS10 - Help Wanted !!!
>
>
> My PRS10 v.3.21 sends "SYNTAX ERROR" in the TT string for TT values above
> approx. 999999640 (ext. 1PPS input active). LadyHeather therefore shows no
> negative TTs. Only when the TT gets smaller does LH also show more negative
> values than approx. -360ns, otherwise 0 or positive. If you read the other
> parameters, you will find that TO = 0 and TS = 12000, PS = 200 (unlikely
> that these round values are correct ). If 1PPS output and input are
> connected, TT = 1855 is output. This value should be saved with TO as
> -1855. A full recall (RC1) also brought no change. Attached is an LH screen
> printout.
>
>
>
> Do you have any ideas on how I can fix the problem? The part has the
> customer PN: 123-44101-06. Could these strange parameters possibly be
> related to this PN? Does anyone have such a PRS10 v. 3.21 with this PN and
> could he send me his values (TO, TS, PS)?
>
> Support from SRS is unfortunately not really available because I did not
> buy the device directly from them - thanks SRS !!! -
>
> Does anyone *know the factory access code* (will of course be treated
> confidentially) to write the correct values in the device?
>
> I would be very grateful if there was a ?PRS10 professional? who could help
> me. For direct answers, I can also be reached at verochris at web.de.
>
>
>
> Thank you very much
> Christoph
> -------------- next part --------------
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>
> ------------------------------
>
> Message: 5
> Date: Mon, 10 Feb 2020 06:27:02 -0600
> From: Chris Burford <cburford1 at austin.rr.com>
> To: Christoph Guenther via time-nuts <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] PRS10
> Message-ID: <229ab8cd-19c7-5ccf-3029-7a1806e571db at austin.rr.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Hi Christoph,
>
> You might would want to try and calibrate the (T)ime (O)ffset as per
> page 32 of the Operation and Service Manual and then write that value
> with the TO! command.
>
> This may or may not clear out any residual issues.
>
> Regards,
>
> Chris
>
> On 02/10/20 03:10:37, Christoph Guenther via time-nuts wrote:
> > PRS10 - Help Wanted !!!
> >
> >
> > My PRS10 v.3.21 sends "SYNTAX ERROR" in the TT string for TT values above
> > approx. 999999640 (ext. 1PPS input active). LadyHeather therefore shows
> no
> > negative TTs. Only when the TT gets smaller does LH also show more
> negative
> > values than approx. -360ns, otherwise 0 or positive. If you read the
> other
> > parameters, you will find that TO = 0 and TS = 12000, PS = 200 (unlikely
> > that these round values are correct ). If 1PPS output and input are
> > connected, TT = 1855 is output. This value should be saved with TO as
> > -1855. A full recall (RC1) also brought no change. Attached is an LH
> screen
> > printout.
> >
> >
> >
> > Do you have any ideas on how I can fix the problem? The part has the
> > customer PN: 123-44101-06. Could these strange parameters possibly be
> > related to this PN? Does anyone have such a PRS10 v. 3.21 with this PN
> and
> > could he send me his values (TO, TS, PS)?
> >
> > Support from SRS is unfortunately not really available because I did not
> > buy the device directly from them - thanks SRS !!! -
> >
> > Does anyone *know the factory access code* (will of course be treated
> > confidentially) to write the correct values in the device?
> >
> > I would be very grateful if there was a ?PRS10 professional? who could
> help
> > me. For direct answers, I can also be reached at verochris at web.de.
> >
> >
> >
> > Thank you very much
> > Christoph
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 10 Feb 2020 14:36:45 +0000 (UTC)
> From: Taka Kamiya <tkamiya9 at yahoo.com>
> To: Discussion of Precise Time and Frequency Measurement
> <time-nuts at lists.febo.com>
> Subject: [time-nuts] Tbolt and LOCK indicator - is it there?
> Message-ID: <694009994.757933.1581345405454 at mail.yahoo.com>
> Content-Type: text/plain; charset=UTF-8
>
> I have a few red labeled retail version of an older t-bolt.? I'm wondering
> if there is a signal somewhere that will indicate LOCK condition.? I know I
> can read the TSIP output and parse it, but all I need is just a simple
> LED.? It's not anywhere in its manual and I have not seen anyone mention it
> or even discuss it.? Has anyone poked around inside?? Is there a secret
> test point somewhere?
> Thank you.
>
> ---------------------------------------
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 10 Feb 2020 09:55:10 -0500
> From: paul swed <paulswedb at gmail.com>
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] eLoran
> Message-ID:
> <CAD2JfAgzbwauYEi2vR2jXBb=
> Xh6Ga1oDeD3CXxNb_jUcfFnMtA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Well good news on the old LORAN C receivers all are fine. Turned out I had
> a single channel driver bad in the distribution amplifier. Simply used
> another output. Preamp is good also.
> Ready for next week and warming up the Cesiums for a check with a real
> reference. Not that messy GPS stuff. Humor intended.
> Regards
> Paul
> WB8TSL
>
> On Sat, Feb 8, 2020 at 5:55 PM paul swed <paulswedb at gmail.com> wrote:
>
> > That really is exciting. Hmmmm hope the testing goes well.
> > A comment. When ursanav was heavily testing 2013 region I had one of
> there
> > stations here along with a HP5071 Cesium. They obtained data, I obtained
> > serious fun.
> > But what is very interesting is the LORAN antenna is no larger than some
> > of the old GPS cone shape antennas.
> > It was not fed with coax but 2 X twisted shielded pair. The antenna was
> > active. With two elements. The receiver was a 1RU box with a lot of space
> > in it. All processing was done digitally. This solution along with the
> > eLORAN signal could easily lock within cement and steel office buildings
> as
> > tested and demonstrated. With todays ever more powerful processing the
> core
> > might be the size of a cigarette pack as a guess.
> > Back in the archives one of the Time-nuts had created a DSP LORAN
> > receiver. Its fair to say that solution might be reused with the new
> signal.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Sat, Feb 8, 2020 at 4:20 PM Dave Hartzell <hartzell at gmail.com> wrote:
> >
> >> Hi Bob-
> >>
> >> Is the van still open to viewing? I'm in Boulder as well, must be at
> >> NIST?
> >>
> >> Dave
> >>
> >> On Sat, Feb 8, 2020 at 2:07 PM Bob Martin <aphid1 at comcast.net> wrote:
> >>
> >> > On Friday I was given a tour of a van that is
> >> > being outfitted to monitor eLoran signals.
> >> > Pretty exciting.
> >> >
> >> > Bob
> >> > Boulder,CO
> >> >
> >> > _______________________________________________
> >> > time-nuts mailing list -- time-nuts at lists.febo.com
> >> > To unsubscribe, go to
> >> > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> >> > and follow the instructions there.
> >> >
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at lists.febo.com
> >> To unsubscribe, go to
> >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> >> and follow the instructions there.
> >>
> >
>
>
> ------------------------------
>
> Message: 8
> Date: Mon, 10 Feb 2020 10:00:36 -0500
> From: Gary Woods <garygarlic at earthlink.net>
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Cc: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Help with BG7TBL 2015-07-08 GPSDO>Fixed!
> Message-ID: <6kr24fhvnmdupdj1qi6co8dm7hulelfgo4 at 4ax.com>
> Content-Type: text/plain; charset=us-ascii
>
> On Sun, 9 Feb 2020 18:10:36 -0600, you wrote:
>
> >I'm just curious - what piece of kit
> >is the MAX3232 installed in? I'm trying to figure out is it is the DCE or
> >the DTE end.
>
> It's a Chinese BG7TBL GPSDO, using UBlox gps module and oscilloquartz
> OCXO. DCE, with 9-pin serial connector and no handshake. Now talks
> to either the UBlox monitor program or Lady Heather. Internal stuff
> like DAC correction voltage not accessible but as I said, plenty good
> enough for what I need.
>
>
>
>
> ------------------------------
>
> Message: 9
> Date: Mon, 10 Feb 2020 10:41:30 -0500
> From: Bob kb8tq <kb8tq at n1k.org>
> To: Taka Kamiya <tkamiya9 at yahoo.com>, Discussion of precise time and
> frequency measurement <time-nuts at lists.febo.com>
> Subject: Re: [time-nuts] Tbolt and LOCK indicator - is it there?
> Message-ID: <ADBCAA49-269B-43B7-AF90-A0601CF4AB8B at n1k.org>
> Content-Type: text/plain; charset=utf-8
>
> Hi
>
> Not as far as anybody knows. Pretty much all GPSDO?s are targeted at being
> buried deep in an OEM
> system. There is no access to things like LED?s in that case. All
> monitoring is done by the serial / I2C /
> SPI / USB / Ethernet / whatever port.
>
> People have done cute little micro + display boards to add on to the
> TBolt. They do the serial monitoring
> and put up basic information on the display.
>
> Bob
>
> > On Feb 10, 2020, at 9:36 AM, Taka Kamiya via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > I have a few red labeled retail version of an older t-bolt. I'm
> wondering if there is a signal somewhere that will indicate LOCK
> condition. I know I can read the TSIP output and parse it, but all I need
> is just a simple LED. It's not anywhere in its manual and I have not seen
> anyone mention it or even discuss it. Has anyone poked around inside? Is
> there a secret test point somewhere?
> > Thank you.
> >
> > ---------------------------------------
> > (Mr.) Taka Kamiya
> > KB4EMF / ex JF2DKG
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
>
>
>
>
> ------------------------------
>
> Subject: Digest Footer
>
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>
>
> ------------------------------
>
> End of time-nuts Digest, Vol 187, Issue 13
> ******************************************
>
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