[time-nuts] DTS-2077 Very Cool Toy!

I fed a 1 GHz sine wave @ 0 dBm into the DTS-2077. I told the DTS to sample the voltage every 10 ps and dump the data to a file. The attached graph shows the result. The horizontal axis is samples (i.e. increments of 10 ps). The vertical axis is units of 100 uv. I've got a digital scope wit

Re: [time-nuts] GPS choices.

From: Paul [] Using recent examples I'm still not sure why you'd get the $40 Adafruit MTK versus the $70 ($35 quant. 1) Synergy Ublox. Unless you're like me and you just want a variety of devices. === Paul, Try comparing costs when shipped the UK, versus buying a

[time-nuts] New NTBW50AA

I have a slightly earlier version, or a close cousin, of the NTBW50AA that I modified and I've posted photos of it on this list before: http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg The LH plot from the NTBW50AA by quartz55 doesn't look quite right. Here is a LH plot from my N

Re: [time-nuts] New NTBW50AA

OK, did a bit more reading. I already understand the difference between accuracy and stability however. I thought ADEV was some sort of measurement of accuracy, but I understand now it is a measure of stability over time. I'm supposing now that I can assume that the best frequency accuracy I

Re: [time-nuts] Wavecrest DTS 2070

Ed wrote: You could grab the buss bar with your bare hands and not feel a thing. 48V isn't high enough to be dangerous. It all depends on the current drawn through the body (and especially, through one's heart). Therefore, it depends on the point-to-point resistance through the body betwee

Re: [time-nuts] Lightning Strike Site (Jim Lux)

Come on fellas it can't be that difficult to input a pulse to the chip and measure the prop delay to the INT pin this is timenuts after all :-)) Alan G3NYK - Original Message - From: "Jim Lux" To: Sent: Tuesday, September 10, 2013 12:08 AM Subject: Re: [time-nuts] Lightning Strik

Re: [time-nuts] Wavecrest DTS 2070

Somewhere in the depths of boxes (if no lost is a fire about 25 yrs ago) are a few B7700, BSP and AFP boards that followed me home. The BCM chips my guess are now quite rare., Some of the boards have (had?) Motorola ECL. -pete On Mon, Sep 9, 2013 at 3:42 PM, paul swed wrote: > You have s

Re: [time-nuts] Wavecrest DTS 2070

I used to work for a telephone company. Our big sites had power plants that put out -48V at a few thousand amps. If you dropped a wrench across the buss bars, the wrench disappeared in a puff of smoke and a helluva bang. We were also warned about wearing rings or watches when working on the

[time-nuts] Lightning detectors

On 9/9/13 4:08 PM, Jim Lux wrote: On 9/9/13 3:52 PM, Mark Sims wrote: The AS3935 has an INT output pin that signals a detection. You could In an interesting coincidence, Charles Wenzel (yes, that Wenzel) has a design for a lightning detector: http://www.techlib.com/electronics/lightning.ht

Re: [time-nuts] Wavecrest DTS 2070

You have some cml in the basement right? Regards Paul On Mon, Sep 9, 2013 at 5:51 PM, Pete Lancashire wrote: > Lethal was dropping a conductor across the buss bars. If it was not the -2V > it > was -5.2V. I can't remember but it was at least 75A more like 100A. > > The power supplies were in the

[time-nuts] New NTBW50AA

Look at the comments at the start of the heather.cpp in your Lady Heather installation directory for what there is of ducumentation. Your temperature readings are bouncing around because the temperature sensor is only providing readings quantized to 1 degree C. This is usually due to the GPSD

[time-nuts] Lightning Strike Site (Jim Lux)

The AS3935 has an INT output pin that signals a detection. You could monitor that. The AS3935 is based upon an internal DSP processing the receiver output. No telling how long between when the strike occurs and when INT is activated. _

Re: [time-nuts] Lightning Strike Site (Jim Lux)

On 9/9/13 3:52 PM, Mark Sims wrote: The AS3935 has an INT output pin that signals a detection. You could monitor that. The AS3935 is based upon an internal DSP processing the receiver output. No telling how long between when the strike occurs and when INT is activated.

Re: [time-nuts] Wavecrest DTS 2070

On 9/9/13 2:38 PM, Mark C. Stephens wrote: I have seen a 12v car battery and a wire frame bed to torture victims on television twice now. Are you telling me that's bunk?! (pardon the pun) As someone who used to make their living doing just such physical effects for film and TV.. It's a spec

[time-nuts] Lightning Strike Site (Jim Lux)

I played around a little with the AS3935 development kits in the hopes of doing just what Mark suggested--putting together an array of lightning detectors with GPS time stamp, using the PICTIC+ time-stamper designed by Richard McCorkle. We already have a global array of cosmic-ray detectors, and s

Re: [time-nuts] New NTBW50AA

Hi On Sep 9, 2013, at 1:56 PM, "quartz55" wrote: > I moved the antenna, and did a new standard survey which took an hour and > then another 5 minutes or so to lock. The sats don't seem to be any less > right under the trees. You can see the antenna and trees here. > http://s251.photobucket.

Re: [time-nuts] Wavecrest DTS 2070

Only if whatever shorts it vaporizes violently enough to kill you.  When I worked at Burroughs in the 70s, I heard stories about low volts/high amps hijinks. Bob > > From: Mark C. Stephens >To: Discussion of precise time and frequency measurement >Sent: Mon

Re: [time-nuts] Wavecrest DTS 2070

Lethal was dropping a conductor across the buss bars. If it was not the -2V it was -5.2V. I can't remember but it was at least 75A more like 100A. The power supplies were in the bottom of the cabinets and tin plated copper buss bars would run up the side of the back planes. The back planes where

Re: [time-nuts] New NTBW50AA

Hi On Sep 9, 2013, at 9:14 AM, "quartz55" wrote: > Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are > you telling me this TBolt is no better than the Rb standard, as far as > stability and perhaps worse? It may not or may not be any more stable than your LPRO. You c

Re: [time-nuts] Wavecrest DTS 2070

I have seen a 12v car battery and a wire frame bed to torture victims on television twice now. Are you telling me that's bunk?! (pardon the pun) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Lux Sent: Tuesday, 10 September 2013

Re: [time-nuts] A day gone awry...

It looks like "The Conservation of Bustedness" came from Usenet. http://rec.crafts.metalworking.narkive.com/66UwVxf4/conservation-of-bustedness But doesn't entropy mean that the amount of Bustedness in the universe keeps increasing? Hell, I might as well quit. I can't win! Ed On 9/9/2013

Re: [time-nuts] Wavecrest DTS 2070

Ah so the sparks scare you to death, well I can relate to that :) I fear we deviate off course Bob.. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Stewart Sent: Tuesday, 10 September 2013 7:39 AM To: Discussion of precise time and

Re: [time-nuts] Wavecrest DTS 2070

On 9/9/13 2:21 PM, Mark C. Stephens wrote: Is 200 amperes @ 2v not lethal? Not particularly.. any more than putting your fingers across a 1.5 or 3V battery is lethal. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://w

Re: [time-nuts] Wavecrest DTS 2070

Is 200 amperes @ 2v not lethal? -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Tuesday, 10 September 2013 6:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Wavecrest DTS 207

Re: [time-nuts] A day gone awry...

It could have been from grinding my teeth in frustration at buying a dead unit! :) My money's on the 'bad luck comes in threes' legend. I had good luck fixing the DTS-2077 so I had to pay for it with 3 bad things. How's that for unscientific thinking? :) Ed On 9/9/2013 11:27 AM, paul swe

Re: [time-nuts] Wavecrest DTS 2070

That's possible. The only outputs are the CAL1 and CAL2 signals which are square waves at -0V4 and -0v8 into 50 ohms at 8KHz, 1MHz, or 200MHz and the oscillator monitor output at 100 MHz. My spectrum analyzer suggests that it's a square wave. The DTS measures it as +0V2124 and -0V2154. It w

Re: [time-nuts] Wavecrest DTS 2070

Yes indeed it would be reasonable. The good news is that if you have a dead short supply for 2V those are the easiest to troubleshoot. Fixed numbers of pieces of test equipment because of faulty caps that shorted. On Mon, Sep 9, 2013 at 4:42 PM, Ed Palmer wrote: > That's possible. The only out

Re: [time-nuts] A day gone awry...

Ed, I can't remember where I ran across it, but a fellow preached a principle he called "The Conservation of Bustedness". He posited that you can't have everything working all at once: if you fix the counter, the generator breaks; if you fix the generator, the dishwasher goes on the fritz; fix the

Re: [time-nuts] Wavecrest DTS 2070

-2V is a common terminator voltage for ECL In my days before gray hair I worked on a machine that for each rack had a 200A -2V power supply, a fully configured system had over 20 racks. On Mon, Sep 9, 2013 at 1:19 PM, paul swed wrote: > Just trying to figure out why a 2V power supply pretty

Re: [time-nuts] Lightning Strike Site

On 9/9/13 1:20 PM, Mark Sims wrote: A cute little lightning detector based upon the AS3935 lightning detector chip: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html ___ time-nuts mai

Re: [time-nuts] Wavecrest DTS 2070

Just trying to figure out why a 2V power supply pretty curious. Regards Paul. On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer wrote: > I think there's lots of ECL in this thing. In 2012, Richard H McCorkle > said that US Patent #6226231 was for part of the DTS-2075. It shows lots > of ECL. My unit

Re: [time-nuts] GPS choices.

On Mon, Sep 9, 2013 at 2:33 PM, Michael Tharp wrote: > In a word, availability. Try buying a NEO-6T in quantity of less than a reel > (hundreds of pieces), for less than $180 (cost of a sample direct from > u-blox). I didn't mean to suggest only a 6T. I meant any timing quality device which migh

[time-nuts] Lightning Strike Site

A cute little lightning detector based upon the AS3935 lightning detector chip: http://www.embeddedadventures.com/as3935_lightning_sensor_module_mod-1016.html ___ time-nuts mailing list -- time-nuts@febo.com To u

Re: [time-nuts] Wavecrest DTS 2070

I think there's lots of ECL in this thing. In 2012, Richard H McCorkle said that US Patent #6226231 was for part of the DTS-2075. It shows lots of ECL. My unit dates from around 2000 and doesn't have an obvious 3V3 supply, only 5V, 15V, and 24V. One of the 5V supplies might be adjusted for

Re: [time-nuts] Wavecrest DTS 2070

Possibly +2V for ECL Vcc and -3.2V for ECL Vee allowing it to drive 50 ohm loads connected to ground. Otherwise with 0V Vcc and -5.2V Vee the ECL loads must be connected to -2V (or its Thevenin equivalent) Bruce paul swed wrote: 2.1 volt hmm maybe they are doing something with ECL. Say the co

Re: [time-nuts] GPS choices.

On 9/9/2013 11:08, Paul wrote: Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? In a word, availability. Try buying a

Re: [time-nuts] Wavecrest DTS 2070

2.1 volt hmm maybe they are doing something with ECL. Say the common logic was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL. Though these look new enough that ECL should not be in the mix. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer wrote: > Hi Marki, > > > On 9/

Re: [time-nuts] A day gone awry...

OK I don't get it. When I search for a 2077 I get some online game. Now it makes sense that thats a time sink but generally nothing that will break a tooth. Regards Paul WB8TSL On Mon, Sep 9, 2013 at 12:48 PM, Ed Palmer wrote: > At least I didn't drop it on my foot! :) > > Ed > > > > On 9/9/201

Re: [time-nuts] Wavecrest DTS 2070

Hi Marki, On 9/9/2013 12:15 PM, Mark C. Stephens wrote: Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. You're creeping me out Marki! We must be living parallel lives, fortunately my telly is still good, my 9 year old son ha

Re: [time-nuts] GPS choices.

Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? Also is the (up to) 10MHz output from a 6T as useful as it seems it sh

Re: [time-nuts] GPS choices.

There are other options for in-production GPS recievers that are better for timing The Oncore MT12 has been available for many years and will be in the future. They are still made and the "instructions" are a big thick book written by English speaking technical writers at Motorola. These are rea

Re: [time-nuts] Wavecrest DTS 2070

OK now I know what a 2077 dts is. Quite the piece of test equipment. I bet it would hurt if you dropped it on your foot. Regards Paul WB8TSL/1 On Mon, Sep 9, 2013 at 2:15 PM, Mark C. Stephens wrote: > Amazing Ed, I just had a invasive discography last Thursday! > I have been a bit quiet because

Re: [time-nuts] Wavecrest DTS 2070

Amazing Ed, I just had a invasive discography last Thursday! I have been a bit quiet because of a back injury too. We must be living parallel lives, fortunately my telly is still good, my 9 year old son has discovered Dr. Who so we are having great time watching it :) Some of the original series a

[time-nuts] New NTBW50AA

I moved the antenna, and did a new standard survey which took an hour and then another 5 minutes or so to lock. The sats don't seem to be any less right under the trees. You can see the antenna and trees here. http://s251.photobucket.com/user/DogTi/library/time?sort=3&page=1 I'll let it run

Re: [time-nuts] A day gone awry...

At least I didn't drop it on my foot! :) Ed On 9/9/2013 10:10 AM, Burt I. Weiner wrote: Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my

Re: [time-nuts] Wavecrest DTS 2070

Sorry, the oracle is out of the office today - I'm the janitor. :) I see you've already replaced the 24V supply and powered the unit up. I would have removed all output connections on the supplies and tested them seperately. Are you sure about that transformer short? Remember that primarie

Re: [time-nuts] Lightning Strike Site

On 09/09/2013 07:59 AM, J. Forster wrote: > FYI: > > > > -John > > === > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo

[time-nuts] A day gone awry...

Wow! Sorry to hear that you tripped over your 2077. Burt, K6OQK At 09:00 AM 9/9/2013, time-nuts-requ...@febo.com wrote By the way, it turns out that I paid dearly for my good luck with the repair of my 2077. In the two weeks following that, I got a pinched nerve in my back that's still giving

Re: [time-nuts] Lightning Strike Site

On 9/9/13 8:36 AM, Bob Smither wrote: On 09/09/2013 07:59 AM, J. Forster wrote: FYI: Here is another one: http://www.strikestarus.com/ That uses an ad-hoc network of Boltek detectors, which work ok. I had one in 1999-2000 at work..

Re: [time-nuts] Wavecrest DTS 2070

Hi Henk, mine has option a110. The linear supply is definitely strapped for 110v. I disconnected the primary and connected a 24v system supply in its place. Everything burst into life (at 110v, through step-down transformer) Haven't been game to try 230v yet... I guess I'll look at fix or replac

Re: [time-nuts] GPS choices.

On 9/9/13 8:08 AM, Paul wrote: Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Sometimes, continuing availability is a bigger design driver.

[time-nuts] PRS10 time tagging

After feeding pps into a PRS10 I've noticed that after the deltas drop to the single digits the tags become sporadic. Not -1 rather no response at all even though PLL is asserted. Is this a known issue or am I confused again? I sample on the even minute and see things like this: TT: 1 TT: 0 TT:

[time-nuts] GPS choices.

Although the inexpensive yet high sensitivity units are nice I'm not sure why someone would choose a positioning MTK (e.g. Adafruit) over a timing Ublox (or even an old Motorola style timing receiver). Am I missing something? Also is the (up to) 10MHz output from a 6T as useful as it seems it sho

Re: [time-nuts] Lightning Strike Site

On 9/9/13 5:59 AM, J. Forster wrote: FYI: -John the underlying National Lightning Detection Network distributes the data with a timing precision of 1 microsecond RMS. I assume their sensors are GPS synchronized. The location is done by a co

[time-nuts] Lightning Strike Site

FYI: -John === ___ 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] New NTBW50AA

Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are you telling me this TBolt is no better than the Rb standard, as far as stability and perhaps worse? And the frequency accuracy is also no better and both have to be compared to a Cs or H Maser to be calibtated? I though

Re: [time-nuts] New NTBW50AA

Hi The only normal use for even second outputs is in a CDMA base station. The same is true of the multitude of 9.x MHz outputs coming out of the back of that unit. From what I have seen of LH, there's no real need to play with anything else on these units. The only thing you might do is to scan

Re: [time-nuts] New NTBW50AA

Hi I think you may be looking at the ADEV and reading more into it than you should. It's a table of ADEV vs Tau. The longer you have data for, the larger Tau (seconds) it will display. It's not getting better as it displays more data it the table, it's just got more seconds of data. ADEV sh

Re: [time-nuts] Wavecrest DTS 2070

Hi, The 207x is. Auto sensing for the mains. Groet, Henk Op 9 sep. 2013 om 11:52 heeft "Mark C. Stephens" het volgende geschreven: > After removing endless hex screws to get at the insides I find the 24V/2A PSU > that supplies the standby voltages has what appears to be a transformer > pri

Re: [time-nuts] Wavecrest DTS 2070

After removing endless hex screws to get at the insides I find the 24V/2A PSU that supplies the standby voltages has what appears to be a transformer primary short. Problem is, one has to remove the input board to get at the PSU screws. Sounds easy when put like that... I'll take some pix to show

Re: [time-nuts] Wavecrest DTS 2070

I pried open the fuse compartment. Both fuses black. Black as in dead short black. Not good. Short circuit on mains input. Open case. big thick wire carry mains to solid state relay then off to switch mode modules. Relay cannot be short between supplies. Must be one or more PSU with chopper or br

Re: [time-nuts] Wavecrest DTS 2070

Nod, this is the problem I have, It says 110/220 but is it automatic or do I need to change the strapping? I had a look at Ed Palmers excellent tear down and there were switch mode PSU in it. But he has a 2077, mines a 2070 so it could be completely different, or not.. Arrgh.. I am so wanting to