[time-nuts] UK: Notice of GPS jamming exercise 3-17 Oct 2011
Folks, I have received the following notice. I hope it is of some use. _ Dates: 3 - 17 Oct 11. Times: 0700Z 3 Oct 11 to 2000Z 17 Oct 11. Location: The jamming events will take place throughout the UK FIR/UIR north of 51 degrees North. GPS Jamming locations: Faraid Head - from N58° 36.2' W004° 46.4'. Loch Ewe B - from N57° 51.9' W005° 41.1'. Loch Ewe A - from 57.7869N 5.7917W. Frequency:Radar - discrete spots within MOD allocated frequencies within Charlie / Delta (specifically avoiding IFF/SSR frequency bands), Echo / Foxtrot, Golf. India / Juliet (avoiding Marine Navigation Bands in conditions of poor visibility) and Kilo Bands. Communications - Exercise JW discrete frequencies only in bands HF 2000-26500KHZ and V/UHF 137-400MHZ (avoiding international Distress, Emergency and Exercise Safety frequencies). In all cases jamming will be avoided on the TABOO frequencies listed in the UK Procedures for the Control of Non-Operational Jamming (Annex B). _ ___ 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] Disciplining a Rubidium with a Thunderbolt.
On 07/12/11 02:15 AM, Tim Tuck wrote: Hi all, Just wondering how many people have used John Miles work @ http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium oscillator and if so... 1. what was the RB of choice ? 2.have any measurements of phase noise etc. been published on such a rig ? 3. Are there any published how-to's etc. available ? I'd like to build such a beast as my lab standard so any help appreciated. thanks Tim I'm no expert on this, but I believe that the rubidiums have poorer phase noise than crystals, so unless holdover performance is an issue, there is no advantage in using a rubidium over a crystal as long as GPS lock is maintained at all times. The Stanford PRS-10 rubidium looks to be quite nice, as it has a 10 MHz crystal to give good phase noise and also the rubidium for medium term stability. It can be disciplined easily, as it has a 1 pps input. Alas the PRS-10 is not as plentiful (i.e. cheap) as some other rubidiums. There may be better ways, but a PRS-10 and a timing receiver which outputs 1 pps looks to be a relatively easy way to get the short term peformance of a crystal, the medium term performance of a rubidium should the GPS get unlocked and the long term stability of GPS. I'm looking for a lab standard too, so I'd be interested in what other replies you get. For me personally, for a short term solution, I'm thinking of using an undisciplined rubidium. -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ___ 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] Disciplining a Rubidium with a Thunderbolt.
Hi David, Just to clear the AIR, all Rubidium frequency standards have a crystal oscillator as the primary signal source within the Rubidium device. The Rubidium portion of the standard is just a very high Q filter whose properties can be controlled such that it's filter's center frequency has extremely small drift. That small drift factor is, typically, way less then the resulting factors that control drift in a Quartz resonator. In order to gain the properties of the Rubidium's longer term stability and the short term noise properties of a very good Quartz oscillator you would need both items. You select a very good Quartz device and phase lock it to a really good Rubidium (with its own Quartz oscillator). You would adjust the loop constants to correct at a very slow pace consistent with the quality of the very good Quartz oscillator. To get to the next level (connection to the Nation's reference), you would discipline the Rubidium against a GPS device with an even slower loop. So, in the end you have two separate loops with three separate devices. This is not your Nickel Dime store plug-and-play set up. It would have to be set up with care and some experimentation to get it right. For a reference on the basic process, you should read the QST article on Brooke Shera's GPS disciplined oscillator system. Contained within it is a description of the loop process I referred to above. To utilize his method would require upgrading his circuit design (some parts not available any longer) and some software upgrading as well to account for those changes. To obtain the QST article go to Shera's web site at http://www.rt66.com/~shera/ Also click on the more information line for further reading. BillWB6BNQ Dr. David Kirkby wrote: On 07/12/11 02:15 AM, Tim Tuck wrote: Hi all, Just wondering how many people have used John Miles work @ http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium oscillator and if so... 1. what was the RB of choice ? 2.have any measurements of phase noise etc. been published on such a rig ? 3. Are there any published how-to's etc. available ? I'd like to build such a beast as my lab standard so any help appreciated. thanks Tim I'm no expert on this, but I believe that the rubidiums have poorer phase noise than crystals, so unless holdover performance is an issue, there is no advantage in using a rubidium over a crystal as long as GPS lock is maintained at all times. The Stanford PRS-10 rubidium looks to be quite nice, as it has a 10 MHz crystal to give good phase noise and also the rubidium for medium term stability. It can be disciplined easily, as it has a 1 pps input. Alas the PRS-10 is not as plentiful (i.e. cheap) as some other rubidiums. There may be better ways, but a PRS-10 and a timing receiver which outputs 1 pps looks to be a relatively easy way to get the short term peformance of a crystal, the medium term performance of a rubidium should the GPS get unlocked and the long term stability of GPS. I'm looking for a lab standard too, so I'd be interested in what other replies you get. For me personally, for a short term solution, I'm thinking of using an undisciplined rubidium. -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ___ 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. ___ 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] Disciplining a Rubidium with a Thunderbolt.
Here's an app note from NASA on what they did for controlling, or filtering, phase noise, and it can get complicated. http://ipnpr.jpl.nasa.gov/progress_report2/XII/XIIK.PDF Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 1:44 AM WB6BNQ wrote: Hi David, Just to clear the AIR, all Rubidium frequency standards have a crystal oscillator as the primary signal source within the Rubidium device. The Rubidium portion of the standard is just a very high Q filter whose properties can be controlled such that it's filter's center frequency has extremely small drift. That small drift factor is, typically, way less then the resulting factors that control drift in a Quartz resonator. In order to gain the properties of the Rubidium's longer term stability and the short term noise properties of a very good Quartz oscillator you would need both items. You select a very good Quartz device and phase lock it to a really good Rubidium (with its own Quartz oscillator). You would adjust the loop constants to correct at a very slow pace consistent with the quality of the very good Quartz oscillator. To get to the next level (connection to the Nation's reference), you would discipline the Rubidium against a GPS device with an even slower loop. So, in the end you have two separate loops with three separate devices. This is not your Nickel Dime store plug-and-play set up. It would have to be set up with care and some experimentation to get it right. For a reference on the basic process, you should read the QST article on Brooke Shera's GPS disciplined oscillator system. Contained within it is a description of the loop process I referred to above. To utilize his method would require upgrading his circuit design (some parts not available any longer) and some software upgrading as well to account for those changes. To obtain the QST article go to Shera's web site at http://www.rt66.com/~shera/ Also click on the more information line for further reading. BillWB6BNQ Dr. David Kirkby wrote: On 07/12/11 02:15 AM, Tim Tuck wrote: Hi all, Just wondering how many people have used John Miles work @ http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium oscillator and if so... 1. what was the RB of choice ? 2.have any measurements of phase noise etc. been published on such a rig ? 3. Are there any published how-to's etc. available ? I'd like to build such a beast as my lab standard so any help appreciated. thanks Tim I'm no expert on this, but I believe that the rubidiums have poorer phase noise than crystals, so unless holdover performance is an issue, there is no advantage in using a rubidium over a crystal as long as GPS lock is maintained at all times. The Stanford PRS-10 rubidium looks to be quite nice, as it has a 10 MHz crystal to give good phase noise and also the rubidium for medium term stability. It can be disciplined easily, as it has a 1 pps input. Alas the PRS-10 is not as plentiful (i.e. cheap) as some other rubidiums. There may be better ways, but a PRS-10 and a timing receiver which outputs 1 pps looks to be a relatively easy way to get the short term peformance of a crystal, the medium term performance of a rubidium should the GPS get unlocked and the long term stability of GPS. I'm looking for a lab standard too, so I'd be interested in what other replies you get. For me personally, for a short term solution, I'm thinking of using an undisciplined rubidium. -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ___ 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. ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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] Disciplining a Rubidium with a Thunderbolt.
Hi Any time you get into something like this, there are a lot of qualifiers on everything. That makes for a number of special cases. Ignoring them and looking at the most likely: 1) Your typical modular Rb will beat your typical good OCXO past a few hundred seconds on short term stability. 2) The same Rb will start to degrade on short term stability past a few thousand seconds. (Curve goes down, levels, and then starts to come back up). 3) GPS it's self starts out pretty awful. It just keeps getting better the longer you look at it. 4) Most good GPS's will get better than most modular RB's between 5,000 and 50,000 seconds. 5) We are talking about radio here. The atmosphere does matter. There are some daily cycles that might push you out past 86,000 seconds for a unit that's stable under all conditions. You could go with an L1/L2 receiver if you have one available. Of course, what matters is what do the ones I have do and not what a typical population does. You might select parts that do a bit better than typical. That is likely to involve some measure and adjust cycles. If you toss in a TBolt rather than a simple GPS receiver, it's going to clean up some of the GPS crud for short time intervals. That may or may not help things overall. It's not likely to hurt anything though. That's the overview, there are a whole lot of grubby little details each step along the way. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Tim Tuck Sent: Monday, July 11, 2011 9:16 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Disciplining a Rubidium with a Thunderbolt. Hi all, Just wondering how many people have used John Miles work @ http://www.ke5fx.com/tbolt.htm, or similar, to discipline a rubidium oscillator and if so... 1. what was the RB of choice ? 2.have any measurements of phase noise etc. been published on such a rig ? 3. Are there any published how-to's etc. available ? I'd like to build such a beast as my lab standard so any help appreciated. thanks Tim -- VK2XTT :: QF56if :: BMARC :: WIA :: AMSAT-VK :: AMSAT ___ 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. ___ 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.
[time-nuts] An open-source software to automate test equipment - Instrument Control (iC)
May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). iC processes as list of script commands which define the action in clear text, e.g. Tsample setHeaterRange 1 or HP4155 PlotData Id; Vd. Instrument Control is, therefore, easily adapted to various measurement needs. Instrument Control is hosted on http://kenai.com/projects/icontrol and you can download a compiled version (e.g. to try iC right now) as well as the source code (after you became a member of this project). The javadoc/Documentation is also available online (http://icontrol.kenai.com), and I am preparing a manuscript which describes Instrument Control (iC) in more details. Please drop me a note if you like to read the manuscript. There are two short video tutorials explaining what iC can do and how it is used: http://kenai.com/projects/icontrol/downloads/directory/Tutorial_Videos A great feature of iC is that it allows to define new commands in a text file (see tutorial video 2 on generic GPIB commands), and that it is very easy to extend the functionality of iC to support more test equipment (see http://icontrol.kenai.com/doc-files/programmatic.html). iC has been tested on WinXP and Mac, and should also run on Unix/Linux. It works with GPIB cards from National Instruments, Agilent and Prologix. It supports a subset of commands of those instruments: Lakeshore 340/332 Temperature Controller, Agilent 4155/4156 Semiconductor Parameter Analyzer, HP 4192 Impedance Analyzer, Lakeshore 625 Superconducting Magnet Power Supply and more to come. If you give it a try then please let me know how you like it. Hope you find Instrument Control useful! Kurt Pernstich ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
Be careful. There are at least 6 different ones. All incompatible. -John = Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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. ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
I also like the USB-GPIB adapters, as you can easily have separate buses or connect directly to one instrument without GPIB cables (use up to 15ft of cheap USB cables instead), but they are still not cheap or abundant at eBay. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Thomas S. Knutsen Sent: Tuesday, July 12, 2011 1:46 PM To: j...@quik.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] An open-source software to automate test equipment - Instrument Control (iC) Based on my own experience, the NI PCI cards seems to be most compatible for use with different software. The number 2 seems to be the Prologix adapter. 73 de Thomas LA3PNA AE5YS. 2011/7/12 J. Forster j...@quik.com: Be careful. There are at least 6 different ones. All incompatible. -John = Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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. ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html ___ 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. ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
On Tue, Jul 12, 2011 at 2:01 PM, Jose Camara camar...@quantacorp.com wrote: I also like the USB-GPIB adapters, as you can easily have separate buses or connect directly to one instrument without GPIB cables (use up to 15ft of cheap USB cables instead), but they are still not cheap or abundant at eBay. Yes. USB. I doubt I'll ever buy another computer that has a PCI slot.What I was hoping to hear was that there was a way to interface a parallel port or some other DIY interface. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Thomas S. Knutsen Sent: Tuesday, July 12, 2011 1:46 PM To: j...@quik.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] An open-source software to automate test equipment - Instrument Control (iC) Based on my own experience, the NI PCI cards seems to be most compatible for use with different software. The number 2 seems to be the Prologix adapter. 73 de Thomas LA3PNA AE5YS. 2011/7/12 J. Forster j...@quik.com: Be careful. There are at least 6 different ones. All incompatible. -John = Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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. ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html ___ 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. ___ 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. -- Chris Albertson Redondo Beach, California ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
Not only PCI is becoming extinct, but GPIB is also fading off as newer equipment interfaces via USB or Ethernet directly. Still, legacy equipment with another 40 yrs of service in our garages will keep those DOS computers, PCI, GPIB, RS-232 alive... -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson Sent: Tuesday, July 12, 2011 2:15 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] An open-source software to automate test equipment - Instrument Control (iC) On Tue, Jul 12, 2011 at 2:01 PM, Jose Camara camar...@quantacorp.com wrote: I also like the USB-GPIB adapters, as you can easily have separate buses or connect directly to one instrument without GPIB cables (use up to 15ft of cheap USB cables instead), but they are still not cheap or abundant at eBay. Yes. USB. I doubt I'll ever buy another computer that has a PCI slot.What I was hoping to hear was that there was a way to interface a parallel port or some other DIY interface. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Thomas S. Knutsen Sent: Tuesday, July 12, 2011 1:46 PM To: j...@quik.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] An open-source software to automate test equipment - Instrument Control (iC) Based on my own experience, the NI PCI cards seems to be most compatible for use with different software. The number 2 seems to be the Prologix adapter. 73 de Thomas LA3PNA AE5YS. 2011/7/12 J. Forster j...@quik.com: Be careful. There are at least 6 different ones. All incompatible. -John = Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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. ___ 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. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html ___ 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. ___ 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. -- Chris Albertson Redondo Beach, California ___ 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. ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
Once a mobo fails, good luck keeping it alive. The Chinese cap failure might only cover a few years of design, but who knows. I have two dead socket 939 boards due to blown capacitors. I've been using the pieces to upgrade working socket 939 boards. I've managed to run 16bit dos code in dosbox. On 7/12/2011 2:20 PM, Jose Camara wrote: Not only PCI is becoming extinct, but GPIB is also fading off as newer equipment interfaces via USB or Ethernet directly. Still, legacy equipment with another 40 yrs of service in our garages will keep those DOS computers, PCI, GPIB, RS-232 alive... ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
http://prologix.biz/gpib-ethernet-controller.html If these guys are really serious about this, I would concentrate on this dongle. Ethernet boxes are way easier to run on multiple platforms, and java is multi-platform. Ethernet doesn't need drivers. You could also run your lab instruments from a remote location. ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
http://prologix.biz/gpib-ethernet-controller.html ... Ethernet doesn't need drivers. The USB version is as close to not needing drivers as you can get. It uses one of the USB to RS-232 chips that is well supported. Any modern system will already have the driver. Power via USB saves a wall outlet. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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.
[time-nuts] More 60Hz graphs
There is no cycle glitch here, but the frequency changed enough to attract my attention. http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-g11.png The system I'm collecting data on has good but not great time. It's running ntpd, but getting time over the a DSL link rather than from a local GPSDO. It's generally within a few ms and occasionally off by 10s of ms. That's mostly in the fraction of a cycle range so I didn't worry about it. There is one case where it gets confused. If I download a huge file (whole CD), the asymmetric load and long queuing delays on the DSL link confuses ntpd if it keeps up long enough. Here is an example: http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-g7.png The first step is is the confusion. The other two are recovery. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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] time-nuts Digest, Vol 84, Issue 38
I prefer the National Instruments GPIB-USB-HS card and I have lot's of (good) experience with it, although for personal use it might be too pricy. The PCI versions also worked fine for me but are less flexible than the USB version. The Agilent 82357B USB/GPIB interface should be equivalent, but I have not much experience with it, other than that it worked in a test with Instrument Control. For personal use you might consider the Prologix GPIB-USB adapter (on Windows). It is supported by Instrument Control (currently only on Windows), and although it is slower and a bit more cumbersome to program (which is solved in Instrument Control) it is doing fine (I am still debugging the Prologix controller on Mac systems). A few colleagues of mine also used it successfully. Best, Kurt Am 12.07.2011 um 17:21 schrieb time-nuts-requ...@febo.com: Message: 3 Date: Tue, 12 Jul 2011 13:01:36 -0700 From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] An open-source software to automate test equipment - Instrument Control (iC) Message-ID: cabbxvhtk+oxpzuqbkqsntx5a-ua63oatghwum-g0nfjf_bv...@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1 Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? On Tue, Jul 12, 2011 at 10:40 AM, Kurt Pernstich kurt.pernst...@gmail.com wrote: May I please use this forum to advertise Instrument Control (iC), which is an open source Java program to control test equipment via GPIB. It is, so to speak, the poor man's version of LabView (but enough to do my research). Chris Albertson Redondo Beach, California ___ 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.
[time-nuts] Check out HP/Symmetricom 58503B GPS Time and Frequency Receiver | eBay
FYI everyone... 73, Don W4WJ _Click here: HP/Symmetricom 58503B GPS Time and Frequency Receiver | eBay_ (http://cgi.ebay.com/HP-Symmetricom-58503B-GPS-Time-and-Frequency-Receiver-/ 250853948879?pt=LH_DefaultDomain_0hash=item3a680f7dcf) ___ 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.
[time-nuts] Broadband synthesizer
Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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] Broadband synthesizer
Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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] Broadband synthesizer
The 8640A is not a synthesizer. It's a phase locked oscillator. There are guys making repro gears. -John === Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. ___ 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] Broadband synthesizer
Oops. Must remember to engage brain. It's not phase locked. It's counter locked. Sorry, -John == Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. ___ 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] Broadband synthesizer
Bill, I hate to tell you, but your expectations are completely unreasonable. Of course you have not told us what it is that you are trying to accomplish. As you stated you are not into electronics, I suspect you are not understanding the needed requirements of project you are trying to deal with. So, how about telling us what it is you are trying to do ? That way much more intelligent suggestions can be put forth. In describing the project, please be specific and verbose at the same time. Essentially, the more information, the more informed the responses. BillWB6BNQ Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. ___ 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] Broadband synthesizer
You might be able to get something close to your specs with some older gear, like an HP 8660A w/ the correct PI or the AILtech 380 w/ a 2 GHz PI. They won't do millihertz. But note that either of those two are heavy, complex, and may require a lot of effort to get properly working. They were both $40,000+ boxes when new in the 70s-80s. -John === Bill, I hate to tell you, but your expectations are completely unreasonable. Of course you have not told us what it is that you are trying to accomplish. As you stated you are not into electronics, I suspect you are not understanding the needed requirements of project you are trying to deal with. So, how about telling us what it is you are trying to do ? That way much more intelligent suggestions can be put forth. In describing the project, please be specific and verbose at the same time. Essentially, the more information, the more informed the responses. BillWB6BNQ Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. ___ 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. ___ 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] Broadband synthesizer
If you don't mind cranking the tuning knob for the cavity tuner, the 8640B is a good RF generator, not a synthesizer, which I also have one. The synthesizer I have, which you still crank or spin the knob, which in turn turns a digital encoder, is a Racal Dana 9028P, and I enjoy it over it's simplicity, like I do the 8640B. The Boonton is easy to use too, and I think it is set up similar to the Racal, internally, but I'm not sure. I find these easier, and quicker to use, than keyed inputs, and I have a few of these, which to be honest, draw dust. However, some of the keyed input synthesizers generally have a few more options too. There's just too many different models and makes out there to really say what's best for a situation, without knowing all the features needed, but these are the simplest to use, that I've found, and have a decently clean signal. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 6:16 PM J. Forster wrote: Oops. Must remember to engage brain. It's not phase locked. It's counter locked. Sorry, -John == Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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] Broadband synthesizer
Sorry, I got this backwards. The one I mentioned is a Racal 9082P, not 9028. It will only go to about 520 MHz, and so will the Boonton. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 9:41 PM Will Matney wrote: If you don't mind cranking the tuning knob for the cavity tuner, the 8640B is a good RF generator, not a synthesizer, which I also have one. The synthesizer I have, which you still crank or spin the knob, which in turn turns a digital encoder, is a Racal Dana 9028P, and I enjoy it over it's simplicity, like I do the 8640B. The Boonton is easy to use too, and I think it is set up similar to the Racal, internally, but I'm not sure. I find these easier, and quicker to use, than keyed inputs, and I have a few of these, which to be honest, draw dust. However, some of the keyed input synthesizers generally have a few more options too. There's just too many different models and makes out there to really say what's best for a situation, without knowing all the features needed, but these are the simplest to use, that I've found, and have a decently clean signal. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 6:16 PM J. Forster wrote: Oops. Must remember to engage brain. It's not phase locked. It's counter locked. Sorry, -John == Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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.
[time-nuts] Broadband synthesizer
Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned in 1 hz increments but should be dead on. I can feed the passband into speclab via VAC and measure a carrier OTA. No problem there...can get decent resolution but there is some uncertainty with regard to the dds (frequent dependent). What I would like do is inject a known frequency to either zero-beat the carrier (assuming I can get something with millihertz resolution) or provide a non-superimposed carrier that I can reference via difference in speclab. The whole point is to eliminate or measure the dds offset at a particular frequency. ___ 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.
[time-nuts] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay
A guy is offering a complete set item # 320727122967 on eBay. I already have one complete set and lots of duplicates, otherwise I would jump at it. I like the hard copy a lot better than trying to read them on-line. Regards - Mike Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-902-3831 cell ___ 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] Broadband synthesizer
Someone in thread said it once and I will repeat. What are you trying to do? From a millihertz to a Ghz is one heck of a range with milihertz res to boot for under $1K. Thats a cross between an old HP 3335 and a 8660 series with decreasing resolution on increasing frequency. If there is such a beast for under 1K I may want to buy one also. Regards Paul. On Tue, Jul 12, 2011 at 9:45 PM, Will Matney xfor...@citynet.net wrote: Sorry, I got this backwards. The one I mentioned is a Racal 9082P, not 9028. It will only go to about 520 MHz, and so will the Boonton. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 9:41 PM Will Matney wrote: If you don't mind cranking the tuning knob for the cavity tuner, the 8640B is a good RF generator, not a synthesizer, which I also have one. The synthesizer I have, which you still crank or spin the knob, which in turn turns a digital encoder, is a Racal Dana 9028P, and I enjoy it over it's simplicity, like I do the 8640B. The Boonton is easy to use too, and I think it is set up similar to the Racal, internally, but I'm not sure. I find these easier, and quicker to use, than keyed inputs, and I have a few of these, which to be honest, draw dust. However, some of the keyed input synthesizers generally have a few more options too. There's just too many different models and makes out there to really say what's best for a situation, without knowing all the features needed, but these are the simplest to use, that I've found, and have a decently clean signal. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 6:16 PM J. Forster wrote: Oops. Must remember to engage brain. It's not phase locked. It's counter locked. Sorry, -John == Bill, Believe it or not, the HP 8640B is one of the cleanest, as far as signal goes, that you can get, and you can get an option that will take it to 1 GHz, if I remember. You can pick these up pretty cheap, but they have a problem with some plastic gears going out on the tuning assembly. These are old too, but you can find junkers for parts. From a report I read on signal purity once, the next best for these oldies, was a Boonton 102, which outperformed a lot of modern generators concerning purity. However, it won't go to 1 GHz, I don't think, and I don't think there's an option for it. If you're not too worried about extra clean signal purity, there are several others, including ones made by Fluke, and or Wavetek. Don't get me wrong, these not are cheap junk, it's just they didn't show as clean an output as the HP and Boonton above. Without knowing any other features you want, it's hard to tell you anymore than these recommendations. I forget where I read the test done on several of these RF generators, but it's on a website, and others on here may know of the tests I'm speaking of. Also, on the HP 8640B, one could get those plastic gears recut in brass, if they did break, and they would last forever. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 7:41 PM Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. Tia, Doc Sent from my iPhone ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
Re: [time-nuts] Broadband synthesizer
Thats very helpful If you can get away with 10kc to 80 MC an HP 3335 will do millihertz res. Also can set the level in 100th db increments. Very nice for injecting. Price is very reasonable and can be locked to an external ref. Thats the way I use mine. I have picked mine up from $35-75. But that was pre ePay so heavens knows what they are today. Regards Paul WB8TSL On Tue, Jul 12, 2011 at 10:04 PM, Bill Dailey docdai...@gmail.com wrote: Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned in 1 hz increments but should be dead on. I can feed the passband into speclab via VAC and measure a carrier OTA. No problem there...can get decent resolution but there is some uncertainty with regard to the dds (frequent dependent). What I would like do is inject a known frequency to either zero-beat the carrier (assuming I can get something with millihertz resolution) or provide a non-superimposed carrier that I can reference via difference in speclab. The whole point is to eliminate or measure the dds offset at a particular frequency. ___ 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. ___ 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] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay
Boy I like hard copy also but afraid an asking price of $900 for the set isn't in this years budget. But some lucky person will snap them up. Nice to see what a set would have looked like. I have stumbled across a few of them and picked them up for $5 or so. Sometimes I just let them go.They were at the MIT flea. But those book sellers are log gone. At the time (hard to believe) I really did not know what they were. But I do these days. Regards Paul On Tue, Jul 12, 2011 at 10:20 PM, Mike Feher mfe...@eozinc.com wrote: A guy is offering a complete set item # 320727122967 on eBay. I already have one complete set and lots of duplicates, otherwise I would jump at it. I like the hard copy a lot better than trying to read them on-line. Regards - Mike Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-902-3831 cell ___ 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. ___ 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] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay
Y'know, as an MIT grad I once coveted that series. But now that I am 93, I don't give a damn, you see. (Harry Belafonte, on sex education) (actually, I'm 73) So there's $900 that won't be leaving my wallet and aiding the economy by circulating. What does this have to do with time, you ask? Why, only that the passage of time alters men's passions. Bill Hawkins -Original Message- From: Mike Feher Sent: Tuesday, July 12, 2011 9:21 PM A guy is offering a complete set item # 320727122967 on eBay. I already have one complete set and lots of duplicates, otherwise I would jump at it. I like the hard copy a lot better than trying to read them on-line. Regards - Mike ___ 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] MIT RADIATION LABORATORY SERIES 1940-1945 (28 VOLS) on eBay
Bill Hawkins wrote: What does this have to do with time, you ask? Why, only that the passage of time alters men's passions. Yeah, I've had dates like that. H ___ 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] An open-source software to automate test equipment - Instrument Control (iC)
On 7/12/11 1:01 PM, Chris Albertson wrote: Soubnds good if you have a computer GPIB interface. I don't. Which is the best one at a reasonable price? I use the prologix ones (Ethernet flavor).. Brand new, there's several makes to choose from.. last I checked, they're in the $100-200 range. There's also usually a variety of GPIB cards available used, but in the last 5 or 6 years, I've eschewed anything that plugs into the PC.. ___ 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] Broadband synthesizer
On 7/12/11 5:41 PM, Bill Dailey wrote: Looking for recommendations for a broadband synthesizer with external reference connection, at least 1mhz to 1ghz with micro to millihertz resolution. Oh yeah under $1000 or so. I found a real nice one from holzworth but it is about $5k which is a bit rich for me. I have seen. Various hp synthesizer but digging through the specs and the number soup is tough for a non-electronics guy. That's a pretty wide range.. What sort of performance do you need? There's various eval board in a box things around. I've used widgets from NovaSource, about the size of a pack of cards, basically a PLL and controls in a little box. http://www.nova-eng.com/Inside.asp?n=Productsp=Novasource I see they're now part of L3...and the price has gone up to $1150 ___ 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] Broadband synthesizer
Bill, A generator like the HP 8640B would be tunable like you want, since it's a continuous mechanically tuned cavity. However, to get into reading millihertz, you would need an accraute counter to measure the output of the generator. The problem is, most counters are 8 digits in resolution, and at say 10 MHz, you would only be able to read down to 1 Hz (10.01). Also, in this case, you would want the signal to be as clean as possible IMO. There wouldn't be any need to buy something real expensive, unless that's what you're looking for, to use on other projects later on. Best, Will *** REPLY SEPARATOR *** On 7/12/2011 at 9:04 PM Bill Dailey wrote: Ok, I have a dds receiver locked to a gpsdo, the radio can only be tuned in 1 hz increments but should be dead on. I can feed the passband into speclab via VAC and measure a carrier OTA. No problem there...can get decent resolution but there is some uncertainty with regard to the dds (frequent dependent). What I would like do is inject a known frequency to either zero-beat the carrier (assuming I can get something with millihertz resolution) or provide a non-superimposed carrier that I can reference via difference in speclab. The whole point is to eliminate or measure the dds offset at a particular frequency. ___ 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. __ Information from ESET Smart Security, version of virus signature database 5851 (20110206) __ The message was checked by ESET Smart Security. http://www.eset.com ___ 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.
