Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

The TV series "How the States Got Their Shapes" mentions boundary errors occasionally. There were some magnificent errors that took years to resolve. In most cases today, the boundary is what it is and the fact that it's a few inches or feet in error is usually ignored. Many boundaries are a

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

> Le 13 nov. 2017 à 12:12, Hal Murray a écrit : > > > michael.c...@sfr.fr said: prior to my senior project most geodetic surveyors used a Wooden boxed, marine chronometer, to get sub second UT1 time, or back then, GMT > >>> How did you get the data out of

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

michael.c...@sfr.fr said: >>> prior to my senior project most geodetic surveyors used a Wooden boxed, >>> marine chronometer, to get sub second UT1 time, or back then, GMT >> How did you get the data out of the wooden box? > I have a couple of marine chronometers that have electrical

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

> Le 13 nov. 2017 à 01:29, Hal Murray a écrit : > > > apollo...@gmail.com said: >> prior to my senior project most geodetic surveyors used a Wooden boxed, >> marine chronometer, to get sub second UT1 time, or back then, GMT > > How did you get the data out of the

Re: [time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

apollo...@gmail.com said: > prior to my senior project most geodetic surveyors used a Wooden boxed, > marine chronometer, to get sub second UT1 time, or back then, GMT How did you get the data out of the wooden box? -- These are my opinions. I hate spam.

[time-nuts] Newbie to Time Nuts; Seeking wisdom, re Hydrogen MASER applications

Hello fellow Time nuts, I am a newbie here, just joined, first post. But back in college dabbled in "precise time" recording in the field, for Geodetic Surveying field measurements, Star Shots. transiting the meridian. Very crude by today standards, but effective for field measurements that had

Re: [time-nuts] Newbie With a Z3801 Problem

ding replacement if you think that might be a cause of this. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Friday, November 04, 2016 6:56 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re:

Re: [time-nuts] Newbie With a Z3801 Problem

Am 05.11.2016 um 12:51 schrieb Bill Riches: Hi Mark, Thank you for working with the KS24361. Looking forward to when the program will be available. Any ideas on being able to use the 1 PPS signal out of the KS24361 to drive SL sound card calibration? It is a weird pulse and someone

Re: [time-nuts] Newbie With a Z3801 Problem

Hi Mark, Thank you for working with the KS24361. Looking forward to when the program will be available. Any ideas on being able to use the 1 PPS signal out of the KS24361 to drive SL sound card calibration? It is a weird pulse and someone mentioned the timing is wrong. I use the pulse

[time-nuts] Newbie With a Z3801 Problem

I recently got in a KS24361 system to test Lady Heather with. I was having a terrible time talking to it. Lady Heather would detect it (at 19200,7,O,1 on the GPS box, 9600,8,N,1 on the non-gps box). Nothing I did would get it to accept commands. Turns out that the GPS box speaks SCPI at

Re: [time-nuts] Newbie With a Z3801 Problem

> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal >> Murray >> Sent: Friday, November 04, 2016 6:56 PM >> To: Discussion of precise time and frequency measurement >> Cc: hmur...@megapathdsl.net >> Subject: Re: [time-nuts] Newbie With a Z3801 Probl

Re: [time-nuts] Newbie With a Z3801 Problem

- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Friday, November 04, 2016 6:56 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Newbie With a Z3801 Problem I would put a scope on the TX line from the Z38

Re: [time-nuts] Newbie With a Z3801 Problem

---Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: Friday, November 04, 2016 6:56 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Newbie With a Z3801 Problem I would put a scope on the

Re: [time-nuts] Newbie With a Z3801 Problem

I would put a scope on the TX line from the Z3801A and power cycle it. I'm pretty sure it prints out the version string on power up. Have you checked the power supplies? Or looked for old electrolytics? -- These are my opinions. I hate spam.

[time-nuts] Newbie With a Z3801 Problem

Hi all- Dave K2DH here. I'm new to the group as of today. I have an old HP Z3801A that I've had for years and which has been packed away for several years. It worked when I put it away, but now, although it seems to come up correctly, I have no serial comms with it. I'm looking for a little

Re: [time-nuts] Newbie With a Z3801 Problem

I should add to this- On power up of the receiver, the SatStat window does say "Communications established- please wait." Then "Checking echo" Then it goes into the repetitive "Trying to establish communications" and "No response." every 3.5 seconds or so. Dave _ From: Dave Hallidy

Re: [time-nuts] Newbie questions

Hi > On Jan 27, 2016, at 7:56 PM, time...@metachaos.net wrote: > > Bob, et. al., > > Thanks for the advice and information. That has helped a lot in closing some > holes and gives me a lot to consider. I am continuing to research and learn, > this is not a short term project as in building it

Re: [time-nuts] Newbie questions

Hi > On Jan 27, 2016, at 11:08 AM, Jim Harman wrote: > > I am a relative newbie here myself, but at the risk of starting a > firestorm, I would take issue with some of what Bob says below. See > comments interspersed. > > > On Wed, Jan 27, 2016 at 7:43 AM, Bob Camp

Re: [time-nuts] Newbie questions

Hi (a few minor additions ..) > On Jan 27, 2016, at 4:04 PM, Attila Kinali wrote: > > Moin, > > As no-one seems to want to answer the GPS related questions > > > On Tue, 26 Jan 2016 19:04:10 -0500 > time...@metachaos.net wrote: > >> >> Paradoxically, I have no

Re: [time-nuts] Newbie questions

You will find the following discussion of dB useful http://www.sengpielaudio.com/calculator-volt.htm dB references are not just for RF it is/was used extensively in audio work as well where it was often related to 600ohm load vs the 50ohm RF load As for DMM I have a Tektronix DM501A and a

Re: [time-nuts] Newbie questions

That hits the nail on the head. Mathematicians (the OP mentioned he was one) learned long ago that it's easier to add and subtract than to multiply and divide. Jeremy On Wednesday, January 27, 2016, Jim Harman wrote: > Another benefit of using dB vs Watts or Volts is that

Re: [time-nuts] Newbie questions

On Tue, Jan 26, 2016 at 7:04 PM, wrote: > I am trying to learn more about electronics and start doing > hardware projects. I have never been into model building or anything > similar, > so my construction skills are lacking. I understand a lot of things in > theory, > but

Re: [time-nuts] Newbie questions

I am a relative newbie here myself, but at the risk of starting a firestorm, I would take issue with some of what Bob says below. See comments interspersed. On Wed, Jan 27, 2016 at 7:43 AM, Bob Camp wrote: > Hi > > Ok, so let me answer the questions you *should* have asked: > >

Re: [time-nuts] Newbie questions

Bill, Thanks. Your reply was very informative. I understand the reason for using decibels for the applications you mention. However, I did not consider the output level of a non-RF signal to be in that category. You are right, I have never seen a DMM reading in decimals. I know that digital

Re: [time-nuts] Newbie questions

Jeremy, While you are right, "real" mathematicians don't have anything to do with numbers! Its all functions, sets, maps, groups, rings and formal logic (very tongue in cheek here, of course). All very abstract. I also understand about the "chain of elements", but my assumption was that it was a

Re: [time-nuts] Newbie questions

Moin, As no-one seems to want to answer the GPS related questions On Tue, 26 Jan 2016 19:04:10 -0500 time...@metachaos.net wrote: > > Paradoxically, I have no interest in time. As in time of day, day of week, > etc.. I have never had a job where I got to work on time. My philosophy has >

Re: [time-nuts] Newbie questions

Bob, et. al., Thanks for the advice and information. That has helped a lot in closing some holes and gives me a lot to consider. I am continuing to research and learn, this is not a short term project as in building it this week or month. I need to learn and work up to the full project. I will

Re: [time-nuts] Newbie questions

Hi Mike, The element that you are missing is the impedance. When you look at the common formula it refers to a ratio of power or voltage and the impedance is left out with the understanding that the impedance is equal for each power or voltage in the ratio. The actual formula (for power)

[time-nuts] Newbie questions

Ha! I finally answered one of my questions that has been bugging me! I was taking dBm as the definition of voltage - which it is, but only round-about. The hidden variable is the assumed impedance of 50 ohms where 1mW is the zero point for power. That is also why I wasn't getting consistent

Re: [time-nuts] Newbie questions

Hi, MIke. I used the university CDC6400/6600 supercomputer while in engineering school with punch cards or Teletypes and was familiar with S-100 vintage equipment. Somewhere I may still have a MIcrosoft BASIC pre MS-DOS (HDOS or CP/M) looseleaf manual. I haven't retired yet, but have been an

Re: [time-nuts] Newbie questions

Hi Ok, so let me answer the questions you *should* have asked: (They are in no particular order. Number 3 probably should come first) 1) Is the gear I have enough to do this project? No, you will need some sort of frequency / time standard. An atomic clock of some sort is pretty much a

Re: [time-nuts] Newbie questions

Another benefit of using dB vs Watts or Volts is that systems often consist of a chain of elements with gains and losses. Working with gains and losses in dB lets you calculate the signal level at any point along the way and the system gain by adding and subtracting rather than multiplying and

[time-nuts] Newbie questions

Hi, I am a newbie to this list. I have downloaded the archives and read about 5,000 of the past messages. I plan on building my own GPSDO, probably using a LEA-6T (but LEA-7T or LEA-M8T would be good if I can find one affordably). I have a MTI 260 on order (although it could wind up being a 261

Re: [time-nuts] Newbie

On Tue, 18 Aug 2015 10:10:04 -0500, you wrote: There's a good search utility at https://www.mail-archive.com/time-nuts@febo.com/ Dave: Thanks for this; I'm searching for an earlier version of u-center, since the current one doesn't work on XP, and the ublox site doesn't have earlier versions.

Re: [time-nuts] Newbie

The previous was meant to go to the nice person who pointed me to some search option. Humble apologies. It wasn't even my first misteak of the day, but the others were offline. -- Gary Woods O- K2AHC Public keys at home.earthlink.net/~garygarlic, or get 0x1D64A93D via keyserver fingerprint =

Re: [time-nuts] Newbie

garygar...@earthlink.net said: Before I embarrass myself in public (again), is there an archive search for the time nuts list? I'll lurk for a while before posting... Google works pretty well. Just add time-nuts to your search string. If that gets too much duplication from sites that clone

Re: [time-nuts] Newbie

On 08/18/2015 05:33 PM, Hal Murray wrote: Google works pretty well. Just add time-nuts to your search string. If that gets too much duplication from sites that clone the list, add something like site:febo.com Thank you Tom and others in this thread. I was considering posting something

[time-nuts] Newbie

Before I embarrass myself in public (again), is there an archive search for the time nuts list? I'll lurk for a while before posting... -- Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic Zone 5/4 in upstate New York, 1420' elevation. NY WO G

Re: [time-nuts] Newbie

Hi Gary, Yes, useful information about the list: http://leapsecond.com/time-nuts.htm#search /tvb - Original Message - From: Gary Woods garygar...@earthlink.net To: time-nuts@febo.com Sent: Tuesday, August 18, 2015 6:32 AM Subject: [time-nuts] Newbie Before I embarrass myself

Re: [time-nuts] Newbie

There's a good search utility at https://www.mail-archive.com/time-nuts@febo.com/ Cheers, Dave M Gary Woods wrote: Before I embarrass myself in public (again), is there an archive search for the time nuts list? I'll lurk for a while before posting...

Re: [time-nuts] Newbie question

Hi Time-Nuts: Not sure what the protocol is here but I'll just jump in. I've just purchased an HP53310a modulation domain analyzer. Most you already know that these amazing instruments are basically a TIC with a graphic display of frequency vs time. I've always wanted one to record PLL settling

Re: [time-nuts] Newbie question

Hi Time-Nuts: Not sure what the protocol is here but I'll just jump in. I've just purchased an HP53310a modulation domain analyzer. Most you already know that these amazing instruments are basically a TIC with a graphic display of frequency vs time. I've always wanted one to record PLL settling

[time-nuts] Newbie question

Hi Time-Nuts: Not sure what the protocol is here but I'll just jump in. I've just purchased an HP53310a modulation domain analyzer. Most you already know that these amazing instruments are basically a TIC with a graphic display of frequency vs time. I've always wanted one to record PLL

Re: [time-nuts] time-nuts newbie

. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Timothy Bastian Sent: Thursday, May 02, 2013 12:36 PM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts newbie Wow I didn't know how much I was going to stir up here

Re: [time-nuts] time-nuts newbie

-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Timothy Bastian Sent: Thursday, May 02, 2013 12:36 PM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts newbie Wow I didn't know how much I was going to stir up here

Re: [time-nuts] time-nuts newbie

: Thursday, May 02, 2013 12:36 PM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts newbie Wow I didn't know how much I was going to stir up here. As for the accuracy of the DS32khz you are correct in what the literature says. They call for an accuracy of one minute per year. The 10 seconds

Re: [time-nuts] time-nuts newbie

Of Timothy Bastian Sent: Thursday, May 02, 2013 12:36 PM To: time-nuts@febo.com Subject: Re: [time-nuts] time-nuts newbie Wow I didn't know how much I was going to stir up here. As for the accuracy of the DS32khz you are correct in what the literature says. They call for an accuracy

[time-nuts] Newbie question about thunderbolts

Hello all: I am an electronic technician with 30+ years experience fixing computers. In my spare time I like to play with old computers and electronics. Recently I got bit by the precision timing bug, partially after running across the wonderful leapsecond.com site, which lead me here.

Re: [time-nuts] Newbie question about thunderbolts

Hi, Paul. Glad to see you made it here. For the time-nuts; Paul and I have spoken about these issues, and I have had similar experience. The only thing I would add is the the spikes to seem to occur less frequently with a better antenna placement, but when they start to cluster, they fire off one

Re: [time-nuts] Newbie question about thunderbolts

Sounds like a bad OCXO. The crystal frequency jumps slightly, and the disciplining loop then has to compensate by steering the DAC voltage through the loop filter. If that's the problem it may get better if you leave it running for a few more weeks. The smoking gun is the attack/decay

Re: [time-nuts] Newbie question about thunderbolts

I did peek inside the E not long after I got it and I do remember that the OXCO looks very different, it is much smaller than the one on my Nortel unit. If it is the OXCO I can always source a potentially better OXCO and then I can have more fun playing with it. Being a technician I really

Re: [time-nuts] Newbie question about thunderbolts

I did get one bad one leak or pin hole aging so much that it would have run out of tuning range in a month Bert Kehren In a message dated 2/27/2013 7:24:25 P.M. Eastern Standard Time, jmi...@pop.net writes: Sounds like a bad OCXO. The crystal frequency jumps slightly, and the

Re: [time-nuts] Newbie question about thunderbolts

Hi An E series Thunderbolt is about 4X the size of the later Thunderbolt, sometimes called an E. Yes it's very confusing. If the OCXO is about 1 on a side and the unit is maybe 1.5 wide, then you have the later version of the Thunderbolt. Probably the best way to confirm this and eliminate

Re: [time-nuts] Newbie question about thunderbolts

Bob: I am quite sure this is a Thunderbolt E as opposed to the E series of the earlier Thunderbolt, the blue label on top of the aluminum box says Thunderbolt E the blue Trimble box that it came in says Thunderbolt E Starter Kit and yes as I said below the OCXO is smaller than the one on my

Re: [time-nuts] newbie question Thunderbolt supply

time-nuts@febo.com Sent: Sun, Aug 26, 2012 12:31 pm Subject: Re: [time-nuts] newbie question Thunderbolt supply On Sun, Aug 26, 2012 at 3:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check

Re: [time-nuts] newbie question Thunderbolt supply

Kehren -Original Message- From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, Aug 26, 2012 12:31 pm Subject: Re: [time-nuts] newbie question Thunderbolt supply On Sun, Aug 26, 2012 at 3:46 AM

Re: [time-nuts] newbie question Thunderbolt supply

and frequency measurement time-nuts@febo.com Sent: Sun, Aug 26, 2012 12:31 pm Subject: Re: [time-nuts] newbie question Thunderbolt supply On Sun, Aug 26, 2012 at 3:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher

Re: [time-nuts] newbie question Thunderbolt supply

-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Monday, August 27, 2012 9:38 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question Thunderbolt supply Thank you. Will look for it here under thermal pad. Bert In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time

Re: [time-nuts] newbie question Thunderbolt supply

On 08/27/2012 10:09 AM, Jerry wrote: Are these thermal pads temp conductive or insulative? If you want heat dissipation why not use the readily available thermal grease used for semiconductor mounting? Cheap and not really messy if applied correctly A layer of Kapton (polyimide) tape would be

Re: [time-nuts] newbie question Thunderbolt supply

mounting? Cheap and not really messy if applied correctly jerry -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Monday, August 27, 2012 9:38 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question

Re: [time-nuts] newbie question Thunderbolt supply

:44 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question Thunderbolt supply There are components and traces. Bert In a message dated 8/27/2012 10:10:45 A.M. Eastern Daylight Time, jster...@att.net writes: Are these thermal pads temp conductive or insulative? If you want heat

Re: [time-nuts] newbie question Thunderbolt supply

On Mon, Aug 27, 2012 at 3:48 AM, ew ewkeh...@aol.com wrote: te and am looking for the material switchers use between semiconductor and cooling plate Any one know where I can buy it in sheet form? Bert Kehren What happens if you flood the entire assembly in transformer oil? Aside from

Re: [time-nuts] newbie question Thunderbolt supply

-boun...@febo.com] On Behalf Of Chris Albertson Sent: Monday, August 27, 2012 12:02 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] newbie question Thunderbolt supply On Mon, Aug 27, 2012 at 3:48 AM, ew ewkeh...@aol.com wrote: te and am looking

Re: [time-nuts] newbie question Thunderbolt supply

-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: Monday, August 27, 2012 10:44 AM To: time-nuts@febo.com Subject: Re: [time-nuts] newbie question Thunderbolt supply There are components and traces. Bert In a message dated 8/27/2012 10:10:45 A.M. Eastern

Re: [time-nuts] newbie question Thunderbolt supply

of precise time and frequency measurement' Subject: Re: [time-nuts] newbie question Thunderbolt supply Are these thermal pads temp conductive or insulative? If you want heat dissipation why not use the readily available thermal grease used for semiconductor mounting? Cheap and not really messy

Re: [time-nuts] newbie question Thunderbolt supply

Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a

Re: [time-nuts] newbie question Thunderbolt supply

Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator, the more stable it will be. The +12 is by

Re: [time-nuts] newbie question Thunderbolt supply

On 08/26/2012 02:07 PM, Bob Camp wrote: Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator,

Re: [time-nuts] newbie question Thunderbolt supply

Having played with most combinations I could think of including the 1764 there is a lot to be said about the stability of the 7812 and mounting every thing on one plate since power dissipation of the OCXO decreases with increase in ambient temperature and current fluctuation is minimal since

Re: [time-nuts] newbie question Thunderbolt supply

On Sun, Aug 26, 2012 at 3:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter

Re: [time-nuts] newbie question Thunderbolt supply

Hi all: I'm using buck regulators from our ebay friends, e.g. 130704328176 at a little over $1.00 apiece, settable to 5 v or 12 v or whatever, capable of 3 A with good heatsink. Foldback protection. Better than a 3-legged fuse, as my good gaffer Argus calls 'em. Don Bob Camp Hi The only real

[time-nuts] newbie question Thunderbolt supply

I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? Tia Jerry ___ time-nuts mailing list --

Re: [time-nuts] newbie question Thunderbolt supply

Hi As long as the +12 is stable a few percent isn't going to hurt anything. The -12 can be off by a few volts and everything will be fine. Bob On Aug 25, 2012, at 4:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss

Re: [time-nuts] newbie question Thunderbolt supply

On Sat, Aug 25, 2012 at 1:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? The true nuts here on the

Re: [time-nuts] newbie question Thunderbolt supply

Dear Chris, Good afternoon. I am in the process of mounting my TBolt to a 2U 19 rack enclosure and was looking for a decent power supply. I found the Cisco unit and I am ordering a couple of them just in case. It would really be nice if I could have access to the diagram of the upgrade you did

Re: [time-nuts] newbie question Thunderbolt supply

I never made a diagram. All I did was solder down a terminal block to each end of a piece of prototype board. I connected the power lines using some small inductors I had and bypassed power to ground using (I think) 0.01 caps. I mounted the Cisco power supply block to the inside of the case

Re: [time-nuts] newbie question Thunderbolt supply

Hi The easy way to do a TBolt supply is to start with something between 15 and 18 volts. Regulate down to 12 and 5 with linear regulators. 7805's are fine for the +5. Something like a LT1764 might be better for the +12. The -12 supply is very low current and does not matter much. People have

Re: [time-nuts] newbie question Thunderbolt supply

li...@rtty.us said: The -12 supply is very low current and does not matter much. Is the -12 used only for the RS-232, or is it also the negative supply to the DAC? If the latter, the regulation and noise may be important. I think I remember comments about it being used by the DAC. Wasn't

Re: [time-nuts] newbie question Thunderbolt supply

Hi The -12 runs the RS-232 and the negative supply to the DAC buffer. As long as it's past about -7V everything works pretty well. With no negative supply the DAC may have issues. Most of the OCXOs run right around 0V…. Bob On Aug 25, 2012, at 8:55 PM, Hal Murray hmur...@megapathdsl.net

[time-nuts] newbie question Thunderbolt supply

I think I remember comments about it being used by the DAC.  Wasn't there some mention of the TBolt working with a dead -12 supply, but only as long as the DAC output was above 0. That was the conclusion. Actually the units these Thunderbolts were removed from used -7VDC instead of -12VDC.

Re: [time-nuts] newbie question Thunderbolt supply

I would recommend a linear regulated supply rather than a 'switching' supply. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Arthur Dent Sent: Saturday, August 25, 2012 9:25 PM To: time-nuts@febo.com Subject: [time-nuts] newbie

[time-nuts] Newbie to Group. Questions Datum ExacTime 9390-6000

(I apologize if this is a dupe, I used wrong e-mail account previously) Hi I am a lurker, finally signed onto the group. Some of this are probably dumb questions, but I figured this group was the best source of the info! Thanks to a NASA auction, I bought for very cheap, a Datum

Re: [time-nuts] Newbie questions

, January 05, 2010 7:26 PM Subject: Re: [time-nuts] Newbie questions Tom Duckworth wrote: Jim, We use a benchmark 1 ns per foot of coax (RG-59). This sounds fast. The normal taxiometer is at 66% of speed of ligth in vaccum, which for 1 ns is about 3 dm so for the RG-59 that would be about 2 dm

Re: [time-nuts] Newbie questions

[mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Duckworth Sent: 06 January 2010 02:23 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Newbie questions Jim, We use a benchmark 1 ns per foot of coax (RG-59). You could measure the delay by using a resistive

Re: [time-nuts] Newbie questions

Hi The 5335 is a pretty nice counter, you can use the math functions to get just about anything you want displayed. One simple example is to just subtract 10 MHz from the count and display the difference. The problem you run into is overflow in the counter chip. Somewhere around 100 seconds

Re: [time-nuts] Newbie questions

Tom Duckworth wrote: Magnus, We've made this measurement using a 20 ps time interval counter and a GPS disciplined Rubidium frequency standard as the time base; making many concurrent measurements with no dead time between. The resultant measurement was very close to the 1 ns/ft benchmark

Re: [time-nuts] Newbie questions

Bob Camp wrote: Hi The 5335 is a pretty nice counter, you can use the math functions to get just about anything you want displayed. One simple example is to just subtract 10 MHz from the count and display the difference. Indeed. The 5335 can display 12 digits but does not overflow the

Re: [time-nuts] Newbie questions

...@febo.com] On Behalf Of Magnus Danielson Sent: Wednesday, January 06, 2010 9:28 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Newbie questions Bob Camp wrote: Hi The 5335 is a pretty nice counter, you can use the math functions to get just about anything you

Re: [time-nuts] Newbie questions

, January 06, 2010 8:17 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Newbie questions Tom Duckworth wrote: Magnus, We've made this measurement using a 20 ps time interval counter and a GPS disciplined Rubidium frequency standard as the time base; making

Re: [time-nuts] Newbie questions

Hi! Bob Camp wrote: Hi Ahhh, that jogs a few of the tired old brain cells You can run the gate off of the GPIB input to get all kinds of silly long gates. Then you start to get into the cpu overflow issues. Since it's a MSB overflow you can usually clean it up in software *if* you know

Re: [time-nuts] Newbie questions

-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: Wednesday, January 06, 2010 12:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Newbie questions Hi! Bob Camp wrote: Hi Ahhh, that jogs a few of the tired old brain

Re: [time-nuts] Newbie questions

Bob Camp wrote: Hi I agree with you on the spec sheet and the fact that the cpu *should* extend the data. My observation was that it didn't do it if the input frequency was high enough. I tried it on a couple dozen counters built over a period of several years. That would imply that only the

Re: [time-nuts] Newbie questions

...@febo.com] On Behalf Of Magnus Danielson Sent: Wednesday, January 06, 2010 12:41 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Newbie questions Bob Camp wrote: Hi I agree with you on the spec sheet and the fact that the cpu *should* extend the data. My

Re: [time-nuts] Newbie questions

On the 5334, you can get 11 digits resolution on the LED display by subtracting 10MHz from the measurement (-10MHz offset), and setting the mesurement intervall to 99 seconds. Both sources need to be 10MHz of course for this to work. On the 5335 I seem to get one digit less with the same

Re: [time-nuts] Newbie questions

Bob Camp wrote: Hi I have a pile of 5334's in the shed. I'm getting the itch to pull them out and see what they can do. I've always looked down on them a bit, since 5335's were always available for what I needed to do. I've always liked the 5334s for both general bench use, and as TICs where

Re: [time-nuts] Newbie questions

Hi Another thing in their favor is that they are smaller than a 5360, 5345, or a 5335. You can stack more of them in the same space Bob On Jan 6, 2010, at 1:39 PM, John Ackermann N8UR wrote: Bob Camp wrote: Hi I have a pile of 5334's in the shed. I'm getting the itch to pull them out

[time-nuts] Newbie questions

I am new to the list (although lurking now a while) and also new to the more precise species of frequency and time measurement. I have recently powered up an LPro and a Thunderbolt, both of which appear to be working by the book. Connecting the TBolt to my scope external sync and the LPro

Re: [time-nuts] Newbie questions

and frequency measurement time-nuts@febo.com Sent: Tuesday, January 05, 2010 11:17 AM Subject: [time-nuts] Newbie questions I am new to the list (although lurking now a while) and also new to the more precise species of frequency and time measurement. I have recently powered up an LPro

Re: [time-nuts] Newbie questions

Interesting So a 100% error (1e2) would then be 40.4GHz and not 80GHz Sounds like some new math the cost of living department came up with. ws ** Bruce Griffiths bruce.griffiths at xtra.co.nz Tue Jan 5 20:25:05 UTC 2010 One should of course be aware that the number notation used is

Re: [time-nuts] Newbie questions

1. Can someone tell me the meaning and significance of the Timing Outputs numbers in the lower left corner of the TBolt monitor window? (Mine right now is showing plus 3.75 ns and plus 0.01 ppb). The TBolt manual does not describe these, although on one page it lists them as estimates of

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