Re: [time-nuts] nuts about position

from a Thunderbolt compared to using the older Lady Heather 24 hour self survey method? Or is ionospheric noise the limiting factor so determining more accurate position doesn't really help? -- Chris Caudle ___ time-nuts mailing list -- time-nuts@

Re: [time-nuts] NEO-M8N vs. NEO-M8T

of the oscillator directly, so the normal approach to measuring stability with TICC, counters, phase noise analyzers, etc. doesn't really work. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.f

Re: [time-nuts] NEO-M8N vs. NEO-M8T

On Mon, May 21, 2018 1:52 pm, Chris Caudle wrote: > On Mon, May 21, 2018 1:19 pm, Gary E. Miller wrote: >> Now, how to I tell the Linux kernel to apply that correction? > > Have the PPS driver accept the correction before logging the PPS > timestamp. Or just have the PPS

Re: [time-nuts] NEO-M8N vs. NEO-M8T

On Mon, May 21, 2018 1:19 pm, Gary E. Miller wrote: > Now, how to I tell the Linux kernel to apply that correction? Have the PPS driver accept the correction before logging the PPS timestamp. -- Chris Caudle ___ time-nuts mailing list -- time-n

Re: [time-nuts] â NEO-M8N vs. NEO-M8T

ors, just search for sawtooth: https://ivscc.gsfc.nasa.gov/meetings/tow2011/Hambly.Sem.pdf -- Chris Caudle ___ 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] ✘NEO-M8N vs. NEO-M8T

e, that is how GPSDO control loops back out the effects of sawtooth error so it does not add additional unnecessary noise into the control loops for the clean up oscillator. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] nuts about position (cheap receiver)

values showing the corrections to the full position + time equations at each reading? Can you use this data to go back to, for example, a stream of timestamps and add a correction factor to the timestamps to get improved time accuracy on historical data? -- Chris

Re: [time-nuts] TCVCXO Adjustment

potentially some of the tricks that people come up with for getting ns level accuracy on hobby budgets could be applied to this to find a way for non-nuts (or at least not-yet-nuts) to get started on a really low budget. -- Chris Caudle ___ time-nuts

Re: [time-nuts] TCVCXO Adjustment

hield and build a calibration system from a second Arduino. Multiple possibilities that are hard to rule out until the hard performance limits are defined. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www

Re: [time-nuts] TCVCXO Adjustment

current time, temperature range over which the device has to maintain time, etc.). -- Chris Caudle ___ 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] Setting correct date on Trimble Thunderbolt receiver

to get date stamps) you would have to add the equivalent offset yourself. -- Chris Caudle ___ 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] Allan variance by sine-wave fitting

LED is on or off. -- Chris Caudle ___ 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] Team of physicists repeats tvb Project GREAT

ack enclosure? Actually now that I look more closely it looks like maybe two trailers. Doesn't seem like something that Jim is going to be flying any time soon. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https:

Re: [time-nuts] Sick Trimble TBolt

ood possibility. Probably SOIC device, shouldn't be too hard to replace. -- Chris Caudle ___ 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] Sick Trimble TBolt

kings of the devices close to the BNC connector? Don't forget to check the bottom of the PCB, there are a few devices there as well on some models, but I don't know if the layout is the same on all revisions. -- Chris Caudle ___ time-nuts mai

Re: [time-nuts] More on SiLabs 5340

On Mon, January 29, 2018 2:38 pm, John Ackermann N8UR wrote: > The close-in phase noise is quite amazing, but the floor is much worse > than in free-run mode. That phase noise plot doesn't look quite right, what PLL bandwidth did you set? -- C

Re: [time-nuts] More on SiLabs 5340

ck is running exactly at nominal frequency. -- Chris Caudle ___ 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] Trimble Thunderbolt Issue

buffer between the OCXO output and the connector is bad. -- Chris Caudle ___ 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] Slightly OT: interest in a four-output, ultra-low jitter, synthesizer block?

On Thu, January 25, 2018 3:08 pm, Robert LaJeunesse wrote: > but I'll second Bill's section about including the power > supply voltage regulator and bypassing. Many of the SiLabs devices have on chip regulators, some of those may be worth investigating.

Re: [time-nuts] SI5328

supposed to reduce spurs compared to a simpler NCO implementation, but I don't think you can eliminate spurs entirely with any kind of DDS based design. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

Re: [time-nuts] accurate 60 hz reference chips/ckts

s time constant. I would recommend using very low leakage capacitors in your RC filter. -- Chris Caudle ___ 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 instru

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

order to compare their frequency standards? That seems not practical. -- Chris Caudle ___ 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] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

ew oscillators? Are they really using layman's shorthand, and they mean stability and consistency? Or are they really able to measure all the other factors well enough that they can actually mean accuracy in the sense of how the SI second definition calls out absolute zero, gravitational po

Re: [time-nuts] Performance verification for time counters

values to a DAC. Is that not DDS? -- Chris Caudle ___ 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] ublox NEO-M8T improved by insulated chamber?

are about UTC, so there is not necessarily a one size fits all single number for "performance" that everyone will agree with. -- Chris Caudle ___ 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] ublox NEO-M8T improved by insulated chamber?

(one sigma). " -- Chris Caudle ___ 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] ublox NEO-M8T improved by insulated chamber?

or more than about an hour per day relative to solar time? -- Chris Caudle ___ 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] Holdover, RTC for Pi as NTP GPS source

On Wed, November 1, 2017 7:16 pm, Jim Harman wrote: > The DS3231 has an 8 bit register that will change its frequency in > increments of about 0.1ppm. Thus you could discipline it to get its pps > aligned with your reference. That sounds like you just designed the worst GPSDO ever.

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

k. Or just use a rubidium and call it close enough. -- Chris Caudle ___ 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] Oscillators and Ovens

> I don't understand that. Why can't I build a high Q TCXO? Compensation implies pulling the frequency away from the natural resonance. High Q implies that the frequency cannot be pulled very far away from natural resonance. The two items are directly contradictory. -- Chris Caud

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

On Wed, November 1, 2017 3:17 pm, MLewis wrote: > hadn't got there yet Your RTC is not likely to be tightly synchronized to NTP time, so there is a high probability that trying to use RTC as a secondary time source will actually make the system worse than just riding through using the NTP estimate

Re: [time-nuts] Designing an embedded precision GPS time

g systems do not use the RTC for the system clock, only to get close to the correct time at startup. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nut

Re: [time-nuts] Designing an embedded precision GPS time server

ate as stamping in the phy, but should be a relatively consistent fixed offset. -- Chris Caudle ___ 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] Designing an embedded precision GPS time server

ibly they exist, but I do not believe that a driver currently exists which could read the hardware timer on a USB interface, you would need to create the driver (probably after you created the hardware). -- Chris Caudle ___ time-nuts mailing list -- tim

Re: [time-nuts] Designing an embedded precision GPS time server

g with a couple of RS232 converters for the UARTs so you can connect a GPSDO to a BBB to make a time server. In my estimation that seemed like the best return on effort. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe,

Re: [time-nuts] Designing an embedded precision GPS time server

; section: https://chrony.tuxfamily.org/comparison.html -- Chris Caudle ___ 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] Better GPS coming to phones

really nice to see one of these low power, high precision receiver devices used in a Thunderbolt style design that locks the chipset clock to the derived clock to avoid hanging bridges to see if the 10x better precision in location solution could result in 10x lower PPS jitter. -- Chris

Re: [time-nuts] True Position GPSDP + Rb X72

esired precision that I have seen. The X72 manual says that the output should be within 1E-9 in under 10 minutes, and within 5E-11 after 30 minutes. Does any of the equipment you use have finer precision than that? -- Chris Caudle ___ time-nuts mailin

Re: [time-nuts] HP-531xx calibrator nearing completion

was more interested in the XOR doubler. That seems like it might be pretty simple to implement since I will have power supplies for CMOS gates easily available. I don't remember seeing discussions on that technique. -- Chris Caudle ___ time-nut

Re: [time-nuts] HP-531xx calibrator nearing completion

lop to divide by 2, right? Does the XOR circuit still work OK with a narrow duty cycle? thanks, Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and foll

Re: [time-nuts] TBolt and the Local News

On Thu, August 10, 2017 5:12 pm, Bob kb8tq wrote: > Next up is the comment that it took two weeks > and $27,000 to fix. I wonder if that was the cost to purchase new GPSDO units, or the cost to have Trimble dust off the old source code and make a special release for them? -- Chris

Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?

program for doing lots of things with a Thunderbolt, but disciplining the system clock to follow the GPS receiver is not really one of those things. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

ad of the four pin Speakon). UL listed for up to 250V AC. http://www.neutrik.com/en/powercon-20a/ -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Poor man's oven

on. I guess you could use that information to either control an oven or just let the crystal run free and control a synthesizer for the used output. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https:

Re: [time-nuts] WTB: GPSDO

ted and does not imply a fault nor does it impair the operation of the ThunderBolt. -- Chris Caudle ___ 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] WTB: GPSDO

ices work > just fine) it's deaf. You need a DC load so that the GPS receiver thinks there is an active antenna attached. I think that is just a quirk of the Thunderbolts, that rather than just flagging an alarm and continuing to run, it gives up and won't even try to

Re: [time-nuts] TICC plots

n I searched I found an old posting from last November from Mark mentioning Star 4, but I don't remember a multi-week thread going on about fine points of connector pin-outs, etc. like there have been for other surplus GPSDO. Were there not many on the used market? -- Chri

Re: [time-nuts] wifi with time sync

a "what" than a "why" tool. -- Chris Caudle ___ 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] wifi with time sync

he time sync will be moved lower in the hardware stack so that the variation stays below 1us so it can be compensated as a systematic offset. Basically a Wi-Fi version of the hardware time stamping that a lot of NIC's do now for PTP support. Just a guess at this po

Re: [time-nuts] wifi with time sync

f PTPv3. I suspect this is an early version of that work, but hard to tell for sure since the phrase "1588" or "PTP" does not appear in any of those press releases from the Wi-Fi Alliance. -- Chris Caudle ___ time-nuts mailing li

Re: [time-nuts] 1PPS users?

S time slip (recent error in data upload) on the broadcast industry which uses GPS time to synchronize widely separated transmitters so that they can overlap their broadcast coverage areas without interference. I believe the power industry is using GPS provided time to stamp power events for analysis

Re: [time-nuts] Question on LH

y slightly different performance, even running from the same antenna. -- Chris Caudle ___ 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] Audio format with embedded timestamps?

e ending samples based on the accuracy of the sample clock originally used to capture the samples. If you need transport time stamps, then the audio-over-IP protocols use PTP as the reference clock, so you get explicit description of the audio sample location refer

Re: [time-nuts] precision timing pulse

a processor where the number of clocks is constant for all or almost all instructions, and is easy enough that you can code the loops by hand. Code like TVB's divider probably doesn't even use interrupts, it's just a tight loop where the number of instructions is counted to give the b

Re: [time-nuts] Thermal impact on OCXO

On Mon, November 7, 2016 11:41 am, Chris Caudle wrote: > On Mon, November 7, 2016 11:20 am, Bob Stewart wrote: >> Either then OCXO is making up for the temperature change >> by increasing the temperature > > Isn't that the entire point of an OCXO? Actually, that is not v

Re: [time-nuts] Thermal impact on OCXO

On Mon, November 7, 2016 11:20 am, Bob Stewart wrote: > Either then OCXO is making up for the temperature change > by increasing the temperature Isn't that the entire point of an OCXO? -- Chris Caudle ___ time-nuts mailing list -

Re: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available

he connector side of the assembled PCB. Does the layout accommodate mounting in an enclosure? And is this layout just a single channel of the buffer design? In other words only for buffering an oscillator to a single other device for preventing crosstalk or injection locking, not for distrib

Re: [time-nuts] Need Time Help

is the only reference. That document had only that short note, no details on why or specifics of behavior. -- Chris Caudle ___ 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] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Linear Systems jfets. They are not as quiet, but much lower capacitance, so you could put more in parallel to get reduced noise. http://linearsystems.com/products_details.php?pr=jfet-amplifiers--duals&pro_id=65 -- Chris Caudle ___ time-nuts m

Re: [time-nuts] Need 10 MHz for DSN space-probe hunting

? I lose track). For multiplying up you want good frequency stability, not close tracking of PPS to correct time, so follow the advice about longer time constant and more damping to get frequency stability rather than low offset to GPS/NIST time. -- Chris Caudle

Re: [time-nuts] Tbolt issues

time constant parameters? -- Chris Caudle ___ 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] Anybody want a Thunderbolt power supply?

On Wed, August 31, 2016 2:16 pm, Charles Steinmetz wrote: > I had to use two stages of well-designed linear regulation to > make any switching supply acceptable (at a time-nuts level) for use with > a Tbolt. Did you try any passive filters between the switchers and linear regulators?

Re: [time-nuts] Expected 10 MHz offset from a GPSDO?

f by that amount. -- Chris Caudle ___ 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] Q/noise of Earth as an oscillator

On Wed, July 27, 2016 10:33 am, Chris Caudle wrote: > Does that imply that this value is not constant: >>> And if you take the classic definition >>> Q = 2 pi * total energy /energy lost per cycle >>> then it would seem earth has a Q factor. After re-reading "

Re: [time-nuts] Q/noise of Earth as an oscillator

s out to be correct in a rough sense then adding energy to speed up the rotation would change the period and the Q, which isn't a property of most things with high Q that we use as stable clocks. Who has a globe on magnetic bearings in a vacuum chamber and will run the experiment for us?

Re: [time-nuts] NCOCXO anyone?

ave forgotten the vendor, but I seem to recall they had a Maxim DAC inside the oven. -- Chris Caudle ___ 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] DIY TimePod

ransition, because the "square" wave still has a finite rise time, and if you have properly bandwidth limited the signal as required by the Nyquist sampling criterion (input signal must be less than half the frequency of the sampling clock) the

Re: [time-nuts] DIY TimePod

;= 1 lsb)) to ensure this. Can't really dither to >= 1lsb when lsb=msb (single bit quantizer). -- Chris Caudle ___ 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] DIY TimePod

one bit quantizer, which has approximately 6dB dynamic range (neglecting for the moment things such as non-linearity and aliasing). I don't see how you get any decent resolution of where the edge transition actually occurs. -- Chris Caudle ___ t

Re: [time-nuts] DIY TimePod

riod. Can you achieve similar with just a single bit quantizer based on the FPGA CMOS inputs? -- Chris Caudle ___ 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] GPS altitude somewhat wrong?

On Wed, June 8, 2016 3:33 pm, Van Horn, David wrote: > How accurate is the altitude number really? Probably not the question you really want to ask. Try "what does GPS mean by altitude? Altitude relative to what standard?" http://www.esri.com/news/arcuser/0703/geoid1of3.html --

Re: [time-nuts] patents and hobbyist projects (was: Temperature controlled TCVCXO)

ot; is an "or" condition along with "makes" or "uses." There are some exceptions as described elsewhere, so as a practical matter if you make something for your own use it is extremely unlikely to have any legal consequences. -- Chris Caudle On Sun, May 15, 2016 8

Re: [time-nuts] Lady Heather coming soon to a Linux box near you...

er, and the messages would also be passed through to ntpd. -- Chris Caudle ___ 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] Fast risetime pulse generator

that the PIN diodes were used in the manner of a step recovery diode, as a less expensive and more easily attainable replacement. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bi

Re: [time-nuts] Where does the source time for GPS come from?

ing-performance-specification.pdf A google search for "how is USNO time transferred to GPS control" found this document from the USNO web site: http://www.usno.navy.mil/USNO/time/gps/usno-gps-time-transfer -- Chris Caudle ___ time-nuts mailing list

Re: [time-nuts] Advise on building a DIY GPSDO?

should be cheap and I think the pieces are easier to find than that CPLD based design that relies on having a GPS that can output 10kHz instead of just PPS. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to http

Re: [time-nuts] Segal law: freq difference for GPSDO

How many usable satellites does the Thunderbolt show? -- Chris Caudle ___ 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] Effect of the Antenna Delay in setting in Z380!A

set is static, so frequency accuracy is not affected, only the difference between your local PPS output and the location of "true" UTC seconds transition. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] GPS jumps of -13.7 us?

esource_synchronized" flag, some kind of indication that the source of the timestamp is thought to meet the standard implied by the source field. -- Chris Caudle ___ 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] GPS jumps of -13.7 us?

ck of UTC valid flag to mean that the timestamps were now in TAI, so the server kernel applied the TAI to UTC offset to the time received via PTP. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.f

Re: [time-nuts] Pendulum clocks based on John Harrison's writing

as deltaE/sigmaE, but isn't that also deltaE/delta(deltaE) ? Kind of like the second derivative of energy flow in the system. -- Chris Caudle ___ 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] Lady Heather Server On Raspberry Pi 2 Model B?

r yet to connect my Thunderbolt to my ARM system (BeagleBone Black in my case, not RPi), so I can't check it out directly yet. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/m

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

>> On Jan 12, 2016, at 7:17 AM, Chris Caudle wrote: >> Can ntpd using a Thunderbolt as a time source run cooperatively with LH >> accessing the same Thunderbolt over ser2net? That seems like the best On Tue, January 12, 2016 4:01 pm, Nick Sayer via time-nuts wrote: >

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

tem with a Thunderbolt as a time server. -- Chris Caudle ___ 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] Lady Heather Server On Raspberry Pi 2 Model B?

On Sat, January 9, 2016 8:36 am, Chuck Harris wrote: > Unfortunately, LH uses a graphics toolkit that was written by > John Miles, and it, and he, is windows only. Even compiling as just the server only still compiles and links the graphics toolkit? -- Chris

Re: [time-nuts] Timestamps in audio files?

er and in iXML as the ‘TIMECODE_RATE’ parameter. Sampling Rate: This is stored in the ‘fmt’ (format) and iXML chunks. This tells the playback device at what speed to playback the file, typically 48 kHz in sound-for-picture applications. -- Chris Caudle

Re: [time-nuts] SMD TADD-1 distribution amplifier

tors on opposite sides of the PCB is still just asking for trouble. -- Chris Caudle ___ 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] SMD TADD-1 distribution amplifier

t doesn't have a full part number printed so I can't find the drawing. I believe this Amp patent from 1990 may refer to the method of assembling such a connector: http://www.google.com/patents/US5062811 -- Chris Caudle ___ time-nuts mailin

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

iples of 50 Hz or 60 Hz. Even in that case it is better to have the connectors on the same side so that the high frequency shield currents are not forced across the PCB. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscrib

Re: [time-nuts] SMD TADD-1 distribution amplifier - seeking comments and suggestions?

tors on the same side of the PCB as the output connectors, and make provision for all of the connectors to be snugged down tight to a metal enclosure, or at least a metal plate, so that any parasitic currents flowing on the shields can stay on the shields and won't be forced across the PCB.

[time-nuts] when is LH finished with survey?

rt yet. I need to move my laptop elsewhere, but I don't want to shut it down too early by mistake and lose the 48 hours of survey work already done. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https:

Re: [time-nuts] Einstein Special on PBS

Platonic ideal time passing at a constant rate and literally every physical process progressing at a different rate referred to the Platonic ideal time? -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.

Re: [time-nuts] PM6680 or 53131A for TimePod

hy would you not use the TimePod with a lower power reference? It isn't like a TimePod only works with a cesium clock as the reference source. -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo

Re: [time-nuts] PM6680 or 53131A for TimePod

On Sun, November 15, 2015 3:59 pm, Bob Camp wrote: > I guess the first question would be - If you have a Time Pod, what do you > need a counter for? Or was the original question a slip, and was supposed to be which counter is good for use with TimeLab software? -- Chris

Re: [time-nuts] Beginners GPS locked frequency counter question

the same as described above. USB adaptive isochronous mode throws some wrinkles in that are probably not worth discussing in this context (unless it turns out the original poster is trying to modify a USB sound interface and not a PCI or PCIe interface). --

Re: [time-nuts] Trimble Thunderbolt and David Partridge divider board question

reference conductor. Perhaps with your transmitter operating so closely it is resulting in a lot of ground bounce at the various components on the divider board. As you say, connecting the 10MHz directly without the divider in place would help confirm or eliminate that possibility. -- Chr

Re: [time-nuts] advice for buying VCXO

con, 12.8MHz, +/- 2.5ppm stability for US $3.19. Searching for +/- 1ppm or less drops the number of devices to 41, top of the list is Connor-Winfield +/- 0.1ppm for US $19.95. This was under 1 minute of searching, so I'm curious how you were searching that came up so empty.

Re: [time-nuts] teensy as time capture device

and alternate pin functions. The Beaglebone Black has that feature. I have been trying to figure out if having both the 10MHz to drive the counter and the PPS latching the count fed from the same Thunderbolt might cause some kind of systematic offset similar to a hanging bridge effect. Any guess?

Re: [time-nuts] syncronized clocks

those levels (possibly due to differences in American and historical British definition of billion and trillion, see Wikipedia references to long scale and short scale). -- Chris Caudle ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe,

Re: [time-nuts] Two V(in)s walk into a bar...

them from the same supply: "In most applications, both +24 Vdc supplies (heater and electronic supplies) will be connected together and operated from a +24 Vdc supply" The internal electronics will be running at some lower voltage, so there has to be additional regulation in the modul

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