Re: [time-nuts] 57600 baud rate with Basic???

2012-10-09 Thread shalimr9
I am pretty sure good old Visual Basic Pro version 6.0 (and newer) supports to 115kb. GW Basic officially makes you a dinosaur... Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: cdel...@juno.com To: time-nuts@febo.com Sent: Tue, 09 Oct 2012

Re: [time-nuts] 57600 baud rate with Basic etc

2012-10-11 Thread shalimr9
Most computers and RS-232 interface chips made in the last 10 years support 0-5V as well as +/- 12V. Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Bob Camp li...@rtty.us To: 'Discussion of precise time and frequency measurement'

Re: [time-nuts] Mouser connector

2012-10-14 Thread shalimr9
It's on my web site, look for the GPIB page under Test Equipment. www.ko4bb.com Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Joseph Gray jg...@zianet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun,

Re: [time-nuts] Mouser connector

2012-10-14 Thread shalimr9
Actually they were Digikey part numbers... Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Joseph Gray jg...@zianet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, 14 Oct 2012 7:00 PM Subject:

[time-nuts] Fwd: Re: Contact: Jupiter GPS questions

2012-10-19 Thread shalimr9
Hi TJ, The Jupiter receivers I have are the standard part, and like you I have found detailed design info hard to come by. All I can suggest for your issue is to use a small microcontroller to send the commands to the receiver at power up, then go to sleep until the next power cycle. I have

Re: [time-nuts] Are serial port headers standardized?

2012-10-21 Thread shalimr9
Charismatic impedance, he? Was that with one wire for data and the two neighboring wires as ground? Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement

Re: [time-nuts] documentation for beginners

2012-10-22 Thread shalimr9
I already have a number of time-nuts related wiki pages on my site, anybody is welcome to start a new one. It is open to anyone. Didier KO4BB www.ko4bb.com Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: David J Taylor david-tay...@blueyonder.co.uk To:

Re: [time-nuts] Two PICTIC II bare boards for sale

2012-10-24 Thread shalimr9
It is easy to add a JTAG programming header to the TBolt display sold by fluke.l and others that are based on my design. The software is already written for the TBolt, the code is open source (in C), somewhat documented and available, the tools are free and the JTAG adapter is only $20. The

Re: [time-nuts] Timing performance of servers

2012-10-26 Thread shalimr9
If you cannot see the horizon because of obstructions (what else?), these obstructions are likely to be a source of multipath. So while technically you do not need to see the horizon, any obstruction above the horizon could cause problems. Of course, distant trees or a hill are less likely to

Re: [time-nuts] 5061B ops manual without missing pages? (updated: 5071A manual uploaded to ko4bb.com

2012-10-28 Thread shalimr9
Speaking of which, the 5071A service manual is on my web site, a kind gift from a list member who sent me an actual high quality paper copy. The Programming Manual is being scanned but I will be out of town next week, so it will probably be another week before it's finished and uploaded.

Re: [time-nuts] How to start a new topic

2012-11-02 Thread shalimr9
No need to encrypt your emails, it makes them hard to read on some devices Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Volker Esper ail...@t-online.de To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, 02 Nov 2012 8:47

Re: [time-nuts] Is it sensible to update every few seconds from NTP server?

2012-11-07 Thread shalimr9
That sounds odd, as most radios take tens of millisecond, if not hundreds to switch from transmit to receive and back in any mode other than break-in CW. Further JT65 is used with propagation modes that typically do not have a stable or predictable propagation time like moonbounce or meteor

Re: [time-nuts] FS/FT HP 5335A

2012-11-24 Thread shalimr9
I have a working EIP 371 that is surplus to my needs. It has the interesting source locking feature (described on my web site) Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Lizeth Norman normanliz...@gmail.com To: time-nuts@febo.com Sent: Sat,

Re: [time-nuts] pulse height

2012-11-26 Thread shalimr9
This kind of discussion comes up regularly, so I wrote this age: http://ko4bb.com/Test_Equipment/CoaxCableMatching.php Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: M. Simon msimon6...@yahoo.com To: time-nuts@febo.com time-nuts@febo.com Sent:

Re: [time-nuts] pulse height

2012-11-26 Thread shalimr9
Said, in the text I indicated the source was not a 50 ohm terminated signal generator, but the 1 pps output of a Thunderbolt with about 5 ohm impedance, hence the ringing. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Said Jackson saidj...@aol.com

Re: [time-nuts] pulse height

2012-11-26 Thread shalimr9
Said, I agree. I intended to complete the page by doing more tests, but the interesting point of the demonstration is that it is sufficient to match the cable at the far end, and in doing so, you preserve the full amplitude of the pulse. If you put 45 ohms in series and terminate in 50 ohms at

Re: [time-nuts] pulse height

2012-11-27 Thread shalimr9
Said, I agree with all you say. My web page does not intend to show what is best, simply what is. Many people are puzzled by the issues of line impedance. Best practices have been discussed at length on this list, but always theoretically. I thought a few scope pictures and explanations would

Re: [time-nuts] Using a frequency synthesizer replacement for motherboard oscillator

2012-11-30 Thread shalimr9
I am not sure that a precision clock will help if the cpu is busy and skips clock cycles. I believe this is one of the problems with general purpose OSes like Windows. I believe the better boards like the Soekis use hardware dividers to alleviate the cpu busy problem. Didier Sent from my

Re: [time-nuts] 3120A Phase Noise Test Probe

2012-12-03 Thread shalimr9
Well, I hope they made it worth your while! Congrats! Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: John Miles jmi...@pop.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Sun, 02 Dec 2012 11:33 PM Subject: Re:

Re: [time-nuts] EIP545A 18GHz counter query

2012-12-09 Thread shalimr9
Good practice with a spectrum analyzer is to put a 20 dB pad at the input all the time unless you are sure you don't need it for a particular measurement. It has saved my bacon many times. It also protects the input connector from excessive wear. Didier KO4BB Sent from my Droid Razr 4G LTE

Re: [time-nuts] Switching oscillators

2012-12-09 Thread shalimr9
Then the next best thing is a time-delay relay set for a delay sufficient to ensure the OCXO has warmed up. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Joseph Gray jg...@zianet.com To: Discussion of precise time and frequency measurement

Re: [time-nuts] Switching oscillators

2012-12-09 Thread shalimr9
If they don't get close, which is right? If you only have 2 references, you cannot tell which is right. Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: li...@lazygranch.com To: Discussion of precise time and frequency measurement

[time-nuts] Counter

2012-12-10 Thread shalimr9
Is shipped, tracking number 1Z30VR960337713831 due Wednesday Didier Sent from my Droid Razr 4G LTE wireless tracker. ___ 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 oven / non-stable operating temperature

2012-12-11 Thread shalimr9
These may have been due to improper oven operation in the OCXO. To make sure, you have to bring out the temp sensing chip like Charles has done. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: WB6BNQ wb6...@cox.net To: Discussion of precise time and

Re: [time-nuts] Z3805A cooling requirements?

2012-12-16 Thread shalimr9
One more thing the Thunderbolt is essentially immune from since there is no separate XO for the GPS receiver which runs from the OCXO. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Said Jackson saidj...@aol.com To: Discussion of precise time and

Re: [time-nuts] Z3805A cooling requirements?

2012-12-16 Thread shalimr9
Forced air will generally be turbulent, which means that the air speed and pressure at any point will follow a somewhat normal (or not) random distribution. That is not good for something that needs stable cooling. Air flow resulting from convection cooling on the other hand is usually laminar,

Re: [time-nuts] Z3805A cooling requirements?

2012-12-16 Thread shalimr9
OCXO not, but the little XO that drives the GPS, that you can be sure of it. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, 16 Dec 2012 8:08

Re: [time-nuts] Is now the timepod a symmetricom product ?

2012-12-19 Thread shalimr9
I was too lazy to look them up, linking the miles.io web site was simpler :) Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Rex r...@sonic.net To: time-nuts@febo.com Sent: Wed, 19 Dec 2012 4:27 PM Subject: Re: [time-nuts] Is now the timepod a symmetricom

Re: [time-nuts] SSR-6t Connector

2012-12-22 Thread shalimr9
As long as you don't have to change the 12AU7, you are OK :) Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, 21 Dec 2012 11:18 AM

Re: [time-nuts] clock-block any need ?

2012-12-28 Thread shalimr9
I have used a commercial stack for 8 bit microcontrollers (Micronet CMX) and as is, it would be a bad choice for timing because of the time it spends processing packets before deciding if they are for itself or not. It could be modified but you need a developer license to get the source code,

Re: [time-nuts] An embedded NTP server

2013-01-01 Thread shalimr9
I have had that problem more than once. Missing Vcc on a chip but the thing runs, just not necessarily well enough, or well enough to go through the next level of test. I have also used it when adding an inverter somewhere on a clock line, and a decoupling cap on the inverter's Vcc is enough

Re: [time-nuts] OT - USB to LPT Adapter - Does it exist?

2013-01-11 Thread shalimr9
Joe, It just so happen I have a never used USB-printer port adapter (with the Centronics connector). There is no driver for it, I believe the driver comes with Windows. You are welcome to it. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: J. L.

Re: [time-nuts] How far can I push a crystal?

2013-01-18 Thread shalimr9
10.059 used to be a standard frequency for some 8051 microcontrollers. Should not be too hard to find. Didier Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Ed Breya e...@telight.com To: time-nuts@febo.com Sent: Thu, 17 Jan 2013 7:11 PM Subject: Re:

Re: [time-nuts] Thunderbolt Monitor

2013-01-24 Thread shalimr9
Have you checked my page? Http://www.ko4bb.com/Timing/GPSMonitor The Toolstick is readily available Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Major L. McGee III maj...@sc.rr.com To: time-nuts@febo.com Sent: Wed, 23 Jan 2013 10:32 AM

Re: [time-nuts] LPRO101 orientation vs lock

2010-09-16 Thread shalimr9
It seems like it would be very tight in a single plug-in, if it even fits. A dual PI would certainly work though. Also, as someone pointed out, the TM-500 series may not have the power and cooling available. I have. TM-5006 chassis that would certainly do the job in both regards, but that's

Re: [time-nuts] Semi-OT: Hardware for WR-90 waveguide sections?

2010-09-19 Thread shalimr9
Robert is obviously correct, however you would be very hard pressed to be able to measure the difference between shoulder screws and regular screws in practice, either through insertion loss, VSWR or power handling. So much so that I have never seen shoulder screws used on rectangular

Re: [time-nuts] Thunderbolt PPS Modification

2010-09-26 Thread shalimr9
See http;//www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStreching/ Didier KO4BB Sent from my Verizon Wireless BlackBerry -Original Message- From: Arthur Dent golgarfrinc...@yahoo.com Sender: time-nuts-boun...@febo.com Date: Sun, 26 Sep 2010 05:07:50 To: time-nuts@febo.com Reply-To:

Re: [time-nuts] antennas

2010-09-27 Thread shalimr9
Last time I checked, the HP/Symmetricom HP58532A GPS antenna was cheaper than a GPS splitter (I paid $50 for my HP58532A, with shipping, and it was brand new). Of course, with two antennas, you will need two feed lines which, depending how long they are, could cost you more than the antenna

Re: [time-nuts] HP 3586B for 60 KHz

2010-10-04 Thread shalimr9
The BFO is (are, one for USB and one for LSBY the only oscillator that is not phase locked to the HP10811 inside, and that can be remedied, so it is not hopeless. Didier Sent from my Verizon Wireless BlackBerry -Original Message- From: J. Forster j...@quik.com Sender:

Re: [time-nuts] 60 KHz Receiver

2010-10-05 Thread shalimr9
There's the minor issue of getting the power company to put in a cable to the house for your 1 Mw (capital M not lower case M) transmitter. I can't resist citing a personal anecdote regarding power distribution. A few years back, I was working on a proposal for a high power (1MW) power supply

Re: [time-nuts] 60 KHz Receiver

2010-10-05 Thread shalimr9
That is basically the sauce behind GPS. What is the power of the transmitters on the satellites? It can't be much, and the signal on the ground is quite a bit below the noise floor before correlation. Didier Sent from my Verizon Wireless BlackBerry -Original Message- From: Poul-Henning

Re: [time-nuts] 60 KHz Receiver

2010-10-05 Thread shalimr9
Not necessarily, on 3 phase systems, you would have to be creative to get below .9 You can easily get to .95 with a simple multipulse rectification. Beyond that, other than regulatory compliance, you do not gain much efficiency. I can't imagine these systems running on anything other than 3

Re: [time-nuts] 60 KHz Receiver

2010-10-07 Thread shalimr9
I visited Pleumeur Baudou shortly after it opened, my father was an engineer with the French Telecom ministry (PTT at the time) and he knew people there. I remember the gigantic offset horn and the maser amplifier. Too bad I do not have pictures from this event. Didier Sent from my Verizon

Re: [time-nuts] Meter face for HP-4805A

2010-10-12 Thread shalimr9
Ok, you beat me to it, thanks! Didier Sent from my Verizon Wireless BlackBerry -Original Message- From: WB6BNQ wb6...@cox.net Sender: time-nuts-boun...@febo.com Date: Tue, 12 Oct 2010 13:11:46 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To:

Re: [time-nuts] Possibly OT - Any interest in a vintage HP/DymecDY-5842 VLF receiver?

2010-10-12 Thread shalimr9
Of course, that's the whole point of the web site :) Didier Sent from my Verizon Wireless BlackBerry -Original Message- From: paul swed paulsw...@gmail.com Sender: time-nuts-boun...@febo.com Date: Tue, 12 Oct 2010 09:31:05 To: Discussion of precise time and frequency

Re: [time-nuts] Subject: Re: Meter face for HP-4805A

2010-10-12 Thread shalimr9
Good point, but still a whole lot better than a blank face with paint chips at the bottom :) Didier Sent from my Verizon Wireless BlackBerry -Original Message- From: gsteinb...@aol.com Sender: time-nuts-boun...@febo.com Date: Tue, 12 Oct 2010 11:11:09 To: time-nuts@febo.com Reply-To:

Re: [time-nuts] Subject: Re: Meter face for HP-4805A

2010-10-12 Thread shalimr9
Well, I suffer not only from dislexia, but also blurred vision. It's a 4800A The meters look the same as the 4805A though. To my defense, my cardiologist told me last week that my good cholesterol was too low and he recommended that I drink a glass of red wire with dinner every day to raise it

Re: [time-nuts] Question about SoundCard stability?

2010-10-14 Thread shalimr9
I think that's what Jim is saying. If you try to fit to the signal using only the zero crossing, it will be hard unless you have a lot of zero crossing, because you will have only one point per period to fit to. If you fit 10 or 100 points per period, you improve your fitting considerably. That

Re: [time-nuts] Neutrinos faster than light update

2012-02-22 Thread shalimr9
I saw this just before leaving home and I must admit I posted it before reading it... But by now everyone knows what the problem was! Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Bill Hawkins b...@iaxs.net Sender:

Re: [time-nuts] Schematic capture, anyone?

2012-02-24 Thread shalimr9
Rick, Thanks for the comments on Eagle. I have been frustrated trying to learn Eagle for a small urgent project recently. I ended up using ExpressPCB and the attendant schematic capture. While it uses proprietary file format and is therefore locked to one vendor, it was surprisingly easy to

Re: [time-nuts] 8051 with RTC

2012-02-29 Thread shalimr9
Said, I can give you C code for a Silabs 8051 driving an I2C RTC in bit-banging mode (works with ANY chip) Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: saidj...@aol.com Sender: time-nuts-boun...@febo.com Date: Tue, 28 Feb

Re: [time-nuts] LORAN C update not all GRIs are back on

2012-03-02 Thread shalimr9
I shipped my Loran receiver to the south hemisphere a couple of months ago for the cost of shipping, not sure if it ever made it. I suppose no news is good news? Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: paul swed

Re: [time-nuts] 5370B heatsink temperature

2012-03-09 Thread shalimr9
I have two 5370A and both run about the same temperature. It is high, but the heatink only supports a few power bipolar transistors used in the power supply that are designed to run hot. Other than the inconvenience of having blisters if you touch the heatsink, I would not worry about it. Its

Re: [time-nuts] DIY GPS-DO

2012-03-10 Thread shalimr9
If you have a small canned VCXO, thermal performance will not be as good as an OCXO like the HP10811, so the optimum time constant of the filter will not be very long, and the analog solution is more practical. You may want to look at the James Miller design. He uses a Jupiter GPS receiver

Re: [time-nuts] WWVB BPSK Receiver Project?

2012-03-15 Thread shalimr9
Poul-Henning, Do you need 16 bits or can you get by with a 12 bit ADC? Have you considered using an FPGA for signal processing? It seems you need a fairly serious CPU to handle that much data. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original

Re: [time-nuts] Xtendwave

2012-03-17 Thread shalimr9
Patent Pending only means that if you copy the design and sell it, some time in the future (if and when the patent is granted), you may have to stop. You will not have to buy back your products or pay anything or be required to license for past use once the patent is granted as long as you stop

Re: [time-nuts] WWVB BPSK Receiver Project?

2012-03-18 Thread shalimr9
I was not concerned about processing power on a PC (or Mac for that matter) but for the uC that was used in PHK's project. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Chris Albertson albertson.ch...@gmail.com Sender:

Re: [time-nuts] IOTECH 488 EPROM

2012-03-21 Thread shalimr9
Do not forget that BlackBox sold Converters and Controllers that are identical internally to the IOTech boxes. The EPROMs can also be swapped between these two. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: J. L. Trantham

Re: [time-nuts] Anyone familiar with SR-620 repair?

2012-03-23 Thread shalimr9
SRS620 schematics are on ko4bb.com Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: John Ackermann N8UR j...@febo.com Sender: time-nuts-boun...@febo.com Date: Fri, 23 Mar 2012 14:46:07 To: j...@quikus.com; Discussion of precise

Re: [time-nuts] Distribution amp - Use a video amp unit ?

2012-03-26 Thread shalimr9
I have often seen (don't ask me how) silicon diodes getting so hot that they unsolder themselves from the board and fall at the bottom of the equipment enclosure, yet they work fine after the fact even though they don't look so good. I have been tempted to solder them back in in more than one

Re: [time-nuts] Yahoo group not receiving emal

2012-03-29 Thread shalimr9
I agree and it is unfortunate, because of all the email accounts I have (and that's quite a few), I like their web mail client the best. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Attila Kinali att...@kinali.ch Sender:

Re: [time-nuts] Antenna for t-bolt

2012-04-03 Thread shalimr9
Hi Chuck, Mine is not dead, just hard of hearing... Once I realized that, I set it aside and I have not used it in years. I got it with a red box Thunderbolt I bought from a lit member a long time ago. It has some obvious signs of experience being outside. It is possible that moisture got

Re: [time-nuts] Antenna for t-bolt

2012-04-03 Thread shalimr9
The elevation angle filter is based on the satellite position, not the actual direction the signals come from. If you have reflections and multipath, but the satellite is otherwise high in the sky, you are out of luck regardless of elevation angle filter. Of course, the higher the sat, the

Re: [time-nuts] Antenna for t-bolt

2012-04-03 Thread shalimr9
If the satellite is above the mask, the signal will be used in computing a solution even if it got in through reflexions and multipath. That's why a good antenna with choke rings is desirable. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original

Re: [time-nuts] NTP jitter with Linux

2012-04-05 Thread shalimr9
An older laptop (Pentium M for instance) can be had for $80 or so any day of the week, won't take much space, is completely standalone (built-in keyboard and display, built-in battery backup) and sips power when idle, which it will be most of the time. The only issue is that you might be

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

2012-04-07 Thread shalimr9
When you install the Altera tools, it automatically installs NIOS and gcc. I assume there are no restrictions for private use, but you may have to send $ if you make a commercial product. That remains to be checked. I have not used NIOS either. Didier KO4BB Sent from my BlackBerry Wireless

[time-nuts] GPSMonitor

2012-04-09 Thread shalimr9
I have updated my GPSMonitor firmware project. Version 0.3.3 released last year allowed to display local time, by applying the time zone offset and the GPS offset (15 seconds at the time). However, GPS offset was hard coded, so it would require a reflash after a leap second. Version 0.3.4

Re: [time-nuts] Best location for a GPS antenna...?

2012-04-13 Thread shalimr9
Michael, There is a very effective fix: move! :) I live in NW Florida and I believe I have found a good solution to the lightning problem. Since lightning never strikes the same place twice (or so goes conventional wisdom), I built my 60' antenna tower a few feet from the exact spot where a

Re: [time-nuts] Chinese Scopes

2012-04-17 Thread shalimr9
I agree that memory depth is an under appreciated parameter, but even 2,500 points like what's available on the cheap Tek scopes is quite useful. On the other hand, I had a few LeCroy with 50k deep memories and there are cases where that is very useful too. I can't imagine real life use cases

Re: [time-nuts] Chinese Scopes (was: Re: LORAN-C at MIT)

2012-04-17 Thread shalimr9
Must be the reason behind the puzzling menus of Microsoft Office 2007 and up... Everything requires one or two more clicks than the 2003 vintage. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Scott McGrath scmcgr...@gmail.com

Re: [time-nuts] Chinese Scopes

2012-04-17 Thread shalimr9
True, the LeCroy I have has +/- trigger, which is sometimes invaluable and very hard to emulate if your scope does not have that feature. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Tom Knox act...@hotmail.com Date: Tue, 17

Re: [time-nuts] Rigol scopes

2012-04-18 Thread shalimr9
That's why the default mode for a DSO should always be pulse detect or whatever the manufacturer calls it, unless you know what you are doing. As far as I know, all DSOs have this or an equivalent mode where the ADC runs at full speed regardless of sweep speed, and the min and max readings

Re: [time-nuts] Chinese Scopes

2012-04-18 Thread shalimr9
One issue with X-Y mode on analog scopes is the different bandwidth of the two signal paths. Do not expect to have amplitude or phase fidelity within the vertical bandwidth. 1/10th of it is probably the best you can hope for. In that regard, DSOs with all their quirks are more symmetrical since

Re: [time-nuts] Rigol scopes

2012-04-19 Thread shalimr9
A non-sampling oscilloscope with limited bandwidth could just as easily miss a narrow pulse because of bandwidth constraints no matter how high its sampling rate. That is the point of the thread. Even a wide bandwidth analog scope used to show a 500nS pulse at a 200Hz repetition rate will have a

Re: [time-nuts] PICTIC II ready-made?

2012-04-28 Thread shalimr9
I have not studied CPLDs but Actel has the only true Flash based FPGAs. The flash cells directly control the FPGA fabric. As such, they are mostly immune to Single Event Upset that plagues just about any other FPGA technology, and there is no configuration step at power up. Didier KO4BB Sent

Re: [time-nuts] PICTIC II ready-made?

2012-04-28 Thread shalimr9
By the way, Actel is now part of Microsemi, with all that it entails. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Jim Lux jim...@earthlink.net Sender: time-nuts-boun...@febo.com Date: Sat, 28 Apr 2012 14:19:40 To:

Re: [time-nuts] thunderbolt no UTC offset

2012-05-01 Thread shalimr9
From memory, the UTC offset is part of the Supplemental data packet that is sent every second by default. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Hal Murray hmur...@megapathdsl.net Sender: time-nuts-boun...@febo.com Date:

Re: [time-nuts] Interesting Clock Project

2012-05-02 Thread shalimr9
I have noticed that it tends to lag when you stay on the page a while. I am sure that is just a matter of a simple adjustment... Thanks for the link :) Didier KO4BB --Original Message-- From: Rob Kimberley Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject:

Re: [time-nuts] HP 5334A battery

2012-05-03 Thread shalimr9
The best way is to buy a rechargeable cell pack for cordless phones. These are typically made with 3 small NiCad so that they don't mind trickle charging and are already safely packaged in shrink tubing with two leads and a connector. When the local Lowe's went out of the phone distribution

Re: [time-nuts] HP 5334A battery

2012-05-03 Thread shalimr9
I have two HP 8116A function generators of widely different manufacturing date and different processor board. Both have a NiCad for memory backup. On the old one, the battery was completely gone and so were many of the traces on the PWB. After all was repaired and the battery replaced with a

Re: [time-nuts] Oh dear

2012-05-06 Thread shalimr9
It could not be any good if it were any cheaper! Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Jim Palfreyman jim77...@gmail.com Sender: time-nuts-boun...@febo.com Date: Mon, 7 May 2012 12:39:48 To: Discussion of precise time

Re: [time-nuts] Clocks for Audio gear

2012-05-11 Thread shalimr9
The brain uses phase at low frequency and amplitude at higher frequencies to find the direction a signal is coming from. It works better for low frequencies than high when you have a steady tone, but high frequency positioning is better when the signal is pulsed. It is almost impossible to

Re: [time-nuts] Clocks for Audio gear

2012-05-11 Thread shalimr9
Breathing and heart beat are filtered out and corrected for by the brain, otherwise we would have difficulties to hear a lot of things. Interestingly, that works well in our natural environment, but not as well when you are somewhere else. When free diving (when there is no noisy scuba gear and

Re: [time-nuts] Trimble Resolution SMT - good/bad/indifferent?

2012-05-11 Thread shalimr9
Yes, I moved them yesterday Didier KO4BB --Original Message-- From: Mark Sims Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: [time-nuts] Trimble Resolution SMT - good/bad/indifferent? Sent: May 10, 2012 11:02 PM Why in the hell would anybody build a 50

Re: [time-nuts] Trimble Resolution SMT - good/bad/indifferent?

2012-05-11 Thread shalimr9
And why would one not want to have 0.7m horizontal accuracy while moving at 100s of knots? You probably need a lot better than that when you fly a SAR on a jet like the GlobalHawk. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message-

Re: [time-nuts] Tbolt failure modes

2012-05-11 Thread shalimr9
The -12V is only used to support the RS-232 driver. The CPU should be running and you should have discipline even without the -12V Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: J. L. Trantham jlt...@att.net Sender:

Re: [time-nuts] Tbolt failure modes

2012-05-12 Thread shalimr9
Ooops, thanks for the correction... Then I assume that if the voltage is too low for the negative reference headroom, severe stability problems could result. Didier KO4BB --Original Message-- From: Mark Sims Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject:

Re: [time-nuts] Shera Controller - U7

2012-05-13 Thread shalimr9
A 74AC74 in SO-14 package mounted dead bug style will make a handy /4 that is no bigger than most crystal oscillators. If that's still too big, you can go with the TSSOP, but no coffee for you for a week prior to soldering that baby :) Didier KO4BB Sent from my BlackBerry Wireless thingy

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-15 Thread shalimr9
The narrow pulses are easily filtered by the power supply because the frequency distribution of the power consumption has a much smaller component at 1Hz. At 1Hz, the power supply filters nothing. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-15 Thread shalimr9
The Thunderbolt's output impedance is much less than 10 ohms. However, it is only necessary to filter the end of the line for a clean pulse. See http://www.ko4bb.com/Test_Equipment/CoaxCableMatching.php I used the Thunderbolt's PPS output as a source in those measurements. Didier KO4BB Sent

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-15 Thread shalimr9
The issue is that the overall power drawn at 1Hz can cause stability problems for all the power supplies, so in the example given by Tom, the power modulation probably affected the power supplies regulation and it affected the next pulse, not the first pulse. Since it is continuous pulse train,

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-15 Thread shalimr9
Mike, here is the effect of the A/C cycling on and off during a warm spring day on the delay through a piece of RG-8 cable maybe 3 feet long: http://www.ko4bb.com/Test_Equipment/data/HP10811-raw.png The full scale (screen height) is about 5x10 to the -10, the length of the record was about one

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-15 Thread shalimr9
Absolutely, that's what the pictures I linked to earlier show, particularly the last one. It is sufficient to properly terminate one end to eliminate ringing, as long as you have no tees in line. There may be specific reasons why it is preferable to terminate one end rather than the other, like

Re: [time-nuts] Why are 1PPS signals so skinny?

2012-05-16 Thread shalimr9
It would be very easy to use a constant current to drive the LED and simply short it periodically to provide the blinking without supply current variations. You would still have short transients in the drive circuit, but these should be much easier to filter. Didier KO4BB Sent from my

Re: [time-nuts] Buffering a PPS signal

2012-05-18 Thread shalimr9
As a driver, you can look at the RS-485 drivers. Some have very temperature stable and well controlled delays in the 10nS range, and they can drive relatively low impedances. I do not have the P/N on hand, but if you can't find one, let me know and I'll send you the P/N from home. Didier

Re: [time-nuts] NTGS50AA RS422

2012-05-20 Thread shalimr9
It would be nice to put the known infromation on the GPSTM boards on a webpage so that newcomers do not have to start from the beginning. You are welcome to use my wiki like for the FE5680 Rubidium oscillator by John Beale: http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq

Re: [time-nuts] is there a cheap and simple way to measure OCXOs?

2012-05-30 Thread shalimr9
If you can offset one enough to have the output from the dbm in the audio band, you could use a sound card based spectrum analyzer to evaluate phase noise. Some sound cards may work down to 10 Hz, but their performance there is usually not specified. Bruce Griffiths has information on some high

Re: [time-nuts] Thunderbolt GPS rollover

2012-06-08 Thread shalimr9
Yes, but you have to do this every 19.2 years and pretty soon it becomes a chore... Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Azelio Boriani azelio.bori...@screen.it Sender: time-nuts-boun...@febo.com Date: Fri, 8 Jun 2012

Re: [time-nuts] Thunderbolt GPS rollover

2012-06-09 Thread shalimr9
I second that. I normally keep the GPS on my phone turned off to save battery life, but when I turn it on to use the map service for instance, I get a fix in as fast as a couple of seconds. That makes it much more convenient than my Tom-Tom car GPS and keeping the phone's GPS turned off unless

Re: [time-nuts] Another ThunderBolt cabling question

2012-06-14 Thread shalimr9
Acrually the PPS output has very low impedance, so you can probably load it with 5 instruments, each with 50 termination. Not so for the 10MHz though Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: David C. Partridge

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