Re: [time-nuts] New WWVB modulation format receivers (NOT)

at over 16dB in a 300Hz bandwidth.) This is near noon local time. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] New WWVB modulation format receivers (NOT)

that handily but all it ever heard were images of the AM-BCB. The HPSDR Hermes board in my ANAN-10 hears WWVB a treat. Direct Down Conversion (DDC) is your friend and anyone considering playing with this stuff really needs to be thinking about a DDC receiver. -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] New WWVB modulation format receivers (NOT)

that fast doesn't mean they are flat out to the Nyquist frequency. Just remember it is a spec game with the audio ADC people. Sure they may sample at 192kHz but many (most?) really are no better than those that sample at 48kHz or even those that sample at 44.1kHz. -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] New WWVB modulation format receivers (NOT)

On 2/20/14, 11:35 PM, Hal Murray wrote: Can somebody give me a lesson in the tradeoffs between number of bits and sampling rate? Sure, the Shannon-Hartley Theorem. See: http://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theorem -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring

Re: [time-nuts] WWVB antennas

much everything from DC-20MHz just fine. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] WWVB antennas

, the distance from WWV in Ft. Collins, Colorado, to my antenna is 1,346.75km, great circle ground route. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] Different breed of time nuttery

neat idea, huh! -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ 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] Serial port splitter s/w

as the Internet connections get better. True, but far more deterministic. As you suggest, a local NTP server is independent of upstream traffic, queueing, and backoff/retry delays. Personally I would like to have a local stratum-1 source for that reason. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline

Re: [time-nuts] 5370 processor boards available

on nothing more than sagging Vcc/Vdd. I bet it is and therefore this whole discussion may be moot. But the idea of making the boot partition RO and the /var partition R/W makes a whole lot of sense to me. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com

Re: [time-nuts] 5370 processor boards available

, ... much ado about nothing. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time

Re: [time-nuts] 5370 processor boards available

from building the internet protocol suite was a whole bunch of, well, let's just try it and see, that resulted in a whole LOT of, Oh, wow, it turns out it's just not a problem because it just doesn't happen. I would be willing to lay a fiver that this is one of those situations. -- Brian Lloyd

Re: [time-nuts] 5370 processor boards available

tried it and screwed up the file system? Plus I really have to say after a full day of time-nuttery I won't remember to shut the linux down. So thats the need good old shutdown controlled by the power off button. But as Tom says please send the thoughts to John. Regards Paul WB8TSL -- Brian

Re: [time-nuts] 5370 processor boards available

. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ 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] Why using HP5370 ext-ref is (maybe) a bad idea

Instead of using the external reference input, any thoughts on actually disciplining the internal OCXO to bypass the problem? -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts

Re: [time-nuts] Frequency Counter using OCXO and MCU

constant so that it will hold the mpu in reset until power has been asserted long enough to ensure that the OCXO is producing output. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts

Re: [time-nuts] Aircraft ping timing

to wiretap and forward the broadcasts. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] NIST time services

, add your OCXO and let the BBB discipline that at the same time. I bet you can come up with an NTP server and a GPSDO for not more than $200. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] NIST time services

Gig-E network shouldn't be too bad. I suspect timing jitter is pretty low. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] Aircraft ping timing

just boggles my mind. You have to work at it in order to take something so conceptually simple and make it this brain-damaged.) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing

Re: [time-nuts] Equinox and sidereal time

On Sunday, March 23, 2014, Neville Michie namic...@gmail.com wrote: Hi, can anyone out there point me to a source for the exact time of the equinoxes and solstices so that I can synchronise a sidereal clock? Check the USNO's website. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive

Re: [time-nuts] Beaglebone NTP server

. I am interested in any answers for this too. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] Beaglebone NTP server

to a GPIO line with appropriate clamping to 3.3V. But if anyone has done this before and run into anything of note, that would be nice to know ahead of time. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Beaglebone NTP server

in getting this running? -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com javascript:_e(%7B%7D,'cvml','br...@lloyd.com'); +1.916.877.5067 -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Beaglebone NTP server

signal. Lastly, it should probably have a really cool Nixie tube display of UTC. (OK, LCD is cheaper but not nearly as cool. Maybe big, bright, 7-segment LED displays?) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] WWV 12 Hz doppler shift

that. It is the complete receiver and sufficient drive for an external PA (or transverter). If you want a 10W PA to go with it, get the ANAN-10. If you want it with a 100W PA get the ANAN-100. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] First success with very simple, very low cost GPSDO, under $8

of assumption can lead to problems that are very hard to debug. So create a semaphore that says who owns the variable. Or, better still, us a message-passing executive. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] First success with very simple, very low cost GPSDO, under $8

to handle the maximum possible accumulated error in an interval. In fact, you probably can get by comfortably with an 8-bit counter. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts

[time-nuts] GPS antenna length correction

that constant from all ranges and thus provide a more correct position and time solution. Is this not the case? Does it do something simpler but good enough? -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] The Problem with Time Timezones - Computerphile

On Thu, May 8, 2014 at 3:34 PM, Chris Albertson albertson.ch...@gmail.comwrote: I wonder how many people have tried to do what this guy describes, not knowing that as he says at the end, you don't have to. Well, I did but it was back in the '70s. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline

[time-nuts] BeagleBone Black NTP server

Has anyone here made NTP run on BBB? My plan is to run NTP disciplined by my Trimble Thunderbolt on BBB. If someone has gotten there ahead of me I would like to follow in your footsteps rather than finding the mines in the minefield all by myself. :-) -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] BeagleBone Black NTP server

On Friday, May 9, 2014, nuts n...@lazygranch.com wrote: On Fri, 9 May 2014 15:55:08 -0500 Brian Lloyd br...@lloyd.com javascript:; wrote: Has anyone here made NTP run on BBB? My plan is to run NTP disciplined by my Trimble Thunderbolt on BBB. If someone has gotten there ahead of me I

Re: [time-nuts] BeagleBone Black NTP server

is to configure ntp to run and then add in the hardware support for 1pps and taking to the T-bolt. I will keep all apprised of my progress. Thank you much! cheers, Graham ve3gtc On 2014-05-10 00:16, nuts wrote: On Fri, 9 May 2014 15:55:08 -0500 Brian Lloyd br...@lloyd.com wrote: Has

Re: [time-nuts] BeagleBone Black NTP server

On Fri, May 9, 2014 at 8:49 PM, Chris Albertson albertson.ch...@gmail.comwrote: On Fri, May 9, 2014 at 1:55 PM, Brian Lloyd br...@lloyd.com wrote: Has anyone here made NTP run on BBB? My plan is to run NTP disciplined by my Trimble Thunderbolt on BBB. NTP is likely already installed

Re: [time-nuts] Weather/units question for European members

/ pascals/?). In the US wind speed is in MPH (civil) or knots (aviation or marine). Atmospheric pressure is in inches of mercury (US) or millibars. I have seen wind speed in m/s in Europe. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Toy radiolocation and LORAN envelope

using a PIC or other uP. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time

Re: [time-nuts] Boeing 787 GPS reception trouble

let's just keep things the same. Amen. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] Boeing 787 GPS reception trouble

On Mon, Jun 2, 2014 at 10:36 PM, Jim Lux jim...@earthlink.net wrote: On 6/2/14, 7:16 AM, Brian Lloyd wrote: On Mon, Jun 2, 2014 at 8:57 AM, Jim Lux jim...@earthlink.net wrote: O, and since navigation using the ADF and tuning to a AM broadcast station wasn't unusual. Well, it is quite

Re: [time-nuts] Loran, GPS, Lightning, Timing

but not destructive voltages. I know you are talking about measuring lightning strikes but if you get the impedance high enough, you can actually measure the earth's electric field. (It is about 200V/m if I recall properly.) Interestingly it is affected by the solar flux and solar wind. -- Brian

Re: [time-nuts] Loran, GPS, Lightning, Timing

was amazed. I have built several things from this and used many of the projects with modern electronics as projects for my students in middle school. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] DIY FE-5680A lobotomy (disable temp compensation)

and is electrically NON-conductive. But it does have a dielectric constant different from air. How much effect would it have at microwave frequencies? Also, what would its effect be on the optical path from the Rb lamp and through the Rb cell? -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring

Re: [time-nuts] Loran, GPS, Lightning, Timing

of lightning detection and ranging. The BF Goodrich Stormscope is based on that. There have to be some documents around on its design. It is, in essence, a LF ADF and somehow qualifies the envelope to deduce range to the strike which it then displays to the pilot. -- Brian Lloyd Lloyd Aviation 706

Re: [time-nuts] Magnetic Resonance Spectromater; was Re: Loran, GPS, Lightning, Timing

but used the idea to motivate me to add a quartz reference to the 60Hz inverter I built from the ARRL handbook, using a bunch of DTL flip-flop dividers, to drive a mechanical clock with a synchronous motor. This was in 1969. So I guess that delimits the beginning of my time-nuttery. -- Brian Lloyd

Re: [time-nuts] Loran, GPS, Lightning, Timing

. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] Interesting frequency standard project

to go talk to the FMT guys as they do testing against some of the MW stations and know which ones have high-accuracy references. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing

Re: [time-nuts] Magnetic Resonance Spectrometer - redux

that I can. :-) And I can't think of any way of tying this to time-nuttery. If there are others still interested in this topic perhaps we can just communicate off-channel. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Antenna

On Tue, Jul 8, 2014 at 5:17 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In difference from the loop which needs none, this antenna needs a really good earthing. Loops are a joy. No counterpoise and no worrying about ground/earth conductivity. -- Brian Lloyd Lloyd Aviation 706

Re: [time-nuts] Setting Windows XP clock.

On Sun, Jul 13, 2014 at 3:18 PM, Don Latham d...@montana.com wrote: Whee! Chris: the text box in the xp clock set window is ONE CHARACTER too short to contain the suggested url. It just gets better and better. pool.ntp.org. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch

Re: [time-nuts] time.windows.com statistics

becomes moot. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ 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] Eureka, no more Cs, active or passive H-masers or GPSDOs needed

was April 1, not March 16. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] Eureka, no more Cs, active or passive H-masers or GPSDOs needed

knowledge and/or prior art. The holders of these patents then use them to attack legitimate companies with successful products, hence the term patent trolls. So, mostly I was just making a joke. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero

Re: [time-nuts] SMTP with Trimble Thunderbolt-E

for monitoring and HTTP for configuration/management of a device. This happened because of the problem of how to manage disparate devices from different manufacturers in a common management platform. So, what do you need to accomplish? -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch

Re: [time-nuts] Homemade GPS Receiver

, i.e. the m^2 in W/m^2, are canceled by the units of the effective area of the antenna, leaving only units of power to appear at the feedline connection. Every unit tells a story. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802

Re: [time-nuts] Wine cooler as temperature chamber

to normal service. They're kind of awkward and ugly too - the best would be a nice small, glass-doored wine chiller, with a normal refrigeration system built in, but maybe a TEC type would be OK for some uses. Stirling cooler. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch

Re: [time-nuts] GPS once a day issues ?

On Mon, Oct 20, 2014 at 2:43 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Bob, Since the satellite orbit the earth with a period of 11 hours and 58 minutes, it is actually twice a day. But then your house has only completed half an orbit. -- Brian Lloyd Lloyd Aviation 706

Re: [time-nuts] LTE-Lite module

world for such a critter. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] float chargers for oscillator backup power

- Series_12_Aug_15.pdf http://www.mouser.com/search/refine.aspx?Ntk=P_MarComNtt=172260151 Some of these things are *extremely* noisy. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359

Re: [time-nuts] Lord Vetinari wall clock

. Clock action, stepper-motor drive, and an arduino. Have fun! -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

[time-nuts] Fluke 7260a manual

Does anyone have a Fluke 7260a manual? I am able to use mine pretty well but would like to better understand the interval measuring functions. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359

Re: [time-nuts] Fluke 7260a manual

. Still hoping to find a scanned copy. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] Lucent KS-24361 24V DC power requirements

the mains fail. You won't have to wait for it to reacquire and stabilize after a mains power failure. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list

Re: [time-nuts] Loran

On Sat, Nov 16, 2013 at 7:04 PM, Bill Riches bill.ric...@verizon.netwrote: Wildwood is still up at 0100 z 11/17. Guess they are running all weekend. Looks like it is off the air again. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Loran

On Sun, Nov 17, 2013 at 7:23 AM, bill.riches bill.ric...@verizon.netwrote: Still on at 1300z Sunday I am wondering if I am actually seeing the eLORAN station at all. The frequency of what I am seeing is 100,005.63 Hz. I can't imagine they would be that far off frequency. -- Brian Lloyd

Re: [time-nuts] Crude Survey Technique

if required. True north or magnetic north? In any case, a good lensatic compass and knowing your magnetic variation should easily get you to within 2 degrees and is a lot easier than doing a survey with your GPS. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br

Re: [time-nuts] Crude Survey Technique

. Magnetic variation is found on all VFR aviation navigation charts. 2 degrees is an interesting number. It seems either too accurate or not accurate enough for most applications I can think of. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline

Re: [time-nuts] Crude Survey Technique

accuracy is still useful for calculations in a control loop. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] Man killed in quartz crystal accident

On Tue, Nov 26, 2013 at 8:42 AM, Bob Stewart b...@evoria.net wrote: This discussion is all very nice, but what possible relationship does it have to time-nuts? Quartz crystals. Let's just say that it morphed from a discussion into a meta-discussion. :-) -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] Man killed in quartz crystal accident

, management was clueless by intention. (One might even say criminally clueless.) I suspect something like that may have been operational in this case as well. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] ***SPAM*** Serial cables with thin connectors

just hog-off the extra plastic until they fit. Of course, there is always the option of making your own using ribbon cable, or making a little extension with ribbon cable between a DB9-m and DB9-f. Never underestimate the power of brute-force and stupidity. -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] GPS timing antenna 5 meter BNC Plug with cable

light. :-) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] recommendations for master reference

-mountable reference with multiple 10MHz outputs that is a GPS disciplined Rb and an NTP server, what would you look for on the used market? Oh, I suppose I would go for a Cs reference if I could find one at the right price. I'm not picky. :-) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive

Re: [time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard

. The input filter caps may not be designed to handle the ensuing ripple current. I would tread lightly in this area. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list

Re: [time-nuts] Measuring TV delays

. So much to remember.) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] Trimble Thunderbolt 1pps

Does the Trimble Thunderbolt provide 1pps on DCD of the RS232 interface? -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] Trimble Thunderbolt 1pps

. Just seemed like a logical thing they might have done for less-critical timing. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] WWV/WWVH audio simulator?

for something on eBay. That will also allow you to tune in CHU for a change. (One can often hear WWV or CHU in my house.) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list

Re: [time-nuts] Trimble Thunderbolt 1pps

there. Unless you bring the 1pps in and synchronize with that, you are probably better off just running NTP. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] Trimble Thunderbolt 1pps

of these should result in an acceptable 1pps with jitter levels lower than the timing resolution of the NTP server you are running on the target machine. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Trimble Thunderbolt 1pps

1 ns or 10 ns or 100 ns or 1 us or 10 us makes no measureable difference to the quality of NTP/PC timekeeping. And my gut, based on designing data communications equipment, is that it is poor engineering practice. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br

Re: [time-nuts] Trimble Studio, what is it?

on a posting here a few days ago. It appears to be an updated replacement for Tboltmon but works for all of their products. Grab a copy from Trimble and run it to see if you like it. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] WAAS.....

. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] WAAS.....

multi-system receivers? I notice that Garmin is selling them as a matter of course now. The prevalence of jamming might be the reason why. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 USA br...@lloyd.com +1.916.877.5067

Re: [time-nuts] WAAS.....

. And I make no claims to being an expert. I am just mostly thinking aloud here. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] WAAS.....

for IFR (instrument) flight it must be tested with the comm radios set to a number of harmonically-related frequencies to ensure there is no interference with the GPS signal and then signed off. So, yes, it is very likely a harmonic of one of your comm radios was jamming the GPS. -- Brian Lloyd

Re: [time-nuts] Local Solar Time Clock

a collection of pebbles that describes a figure '8' (an Analemma). Label the each pebble with the date. Now you can find local solar noon very accurately. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067

Re: [time-nuts] Local Solar Time Clock

with a mechanical clock. Definitely a job for a uP. BUT a really cool thing would be to interface a camera to find the point in time where YOUR local noon actually occurs and corrects the clock. Automatic meridian circle anyone? -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070

Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)

the reference and the 1pps while another core processes the error and sets a third core generating the PWM error signal to correct the reference. Using multiple cores means that one really doesn't have to worry much about interrupt latency (just poll) or race conditions. -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)

the jitter from the PLL. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ 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] housing multiple GPS timing receivers in the same box.

@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts

Re: [time-nuts] clock and cannon at noon story

THAT is serious time-geek humor! -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] Arduino GPSDO with 1ns res TIC

SMD there are new sub 1ppm VCTCXOs available for under $10. On the latter watch out because some of these oscillators use digital temperature correction and while they meet spec, the correction is quantized. Make sure the temperature correction is analog. -- Brian Lloyd, WB6RQN/J79BPL 706

Re: [time-nuts] Now For Something Completely Different...GPS Security

and discarded LORAN, even though the annual maintenance and operation costs were about the same for both. And LORAN provides more accurate positioning than VOR (but not DME-DME and no one bothers to use DME-DME, go figure). -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070

Re: [time-nuts] Now For Something Completely Different...GPS Security

. ;-) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] TIC model

of interrupts somehow? One should investigate the Propeller. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] Good use for an HP 10811

!) But it is! Time is just 1/f. Or is frequency 1/t? I can never remember which is which. ;-) -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] New WWVB modulation format receivers (NOT)

://www.febo.com/cgi-bin/mailman/listinfo/time-nuts -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] LTE-Lite

Mount the LTE-lite to the front panel with a cutout and a green bezel so you can see the LEDs directly. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing

Re: [time-nuts] 1968 Scientific American Magazine: Cesium ClockStandards

endeavor. Hmmm, that probably says something about humanity in general. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe

Re: [time-nuts] Beaglebone NTP server

the PRU for timing? Seems like a straight-forward and useful turn-key kind of thing. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] Beaglebone NTP server

multiple, time-critical applications on one BBB or RPi? Just get lots of them. -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359) ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Beaglebone NTP server

the years, this is almost funny. The BBB is little in physical package size only. Its processing power is not inconsequential. Fuzzballs anyone? -- Brian Lloyd Lloyd Aviation 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.aero +1.210.802-8FLY (1.210.802-8359

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