[time-nuts] 3048A Expert Needed
Martyn: Two things to be aware of: Injection Locking and loop dynamics. Injection Locking: Injection locking can be observed by manually moving one oscillator frequency closer to the other frequency. If one oscillator jumps to the other frequency then more isolation may be needed. Loop Dynamics: The HP11848A and HP3048 software has built in time constants. If the DUT response time is too slow then the software will not react well. If what you want to measure PLL is loop dynamic response then the HP3048A may not be the tool to use. I would separate the variables by measuring the 100MHz and 10MHz oscillator phase noise separately. This is much easier to measure. You could also try measuring though the 100MHz tune port of one of the two pll systems. Let the 10MHz-100MHz pll be at a constant frequency. Interesting problem. Ivan Cousins ___ 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] Phase/frequency scaling with TIC measurements (long)
For Frequency, Phase, Time and Distance I use: (delta frequency/frequency)= (delta phase/phase)= -(delta time/time)= -(delta distance/distance) This is shown on page 20.16 of Electronic Instrument Handbook, second edition by Clyde F. Coombs. It is a good reference to have available. I looked for a free pdf version, but was not able to find one. I added the -(delta distance/distance) part. Ivan Cousins ___ 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] What are some cw signal Generators for ATE test?
time-nuts members: What are some signal generators for ATE test? Requirements: 100MHz to =10GHz (higher would be better) Settling time less than 1mS Reasonable phase noise Cost, less than mortgaging a house.:) Just a single tone that can be moved reasonably fast. IQ modulation not required. Application: Testing ICs or small RF modules. I do not want suggestions of how one could be built. I am aware of pieces that can be used to build one. Generally, the units that are based upon YIGs or YIG tuned filters are not fast enough. I am not looking for general discussions on how one could be designed or measured. Although, this being time-nuts, that will probably happen anyway.:) What I am looking for is one that can be purchased and be used in a test system. I am looking to build a list of possible instruments that can be used. Right now I am only looking at what is on the market for a survey. I am not looking for salesmen to call or write to me. I have done the standard google searches and looked on the usual instrument company web sites. Links to other surveys that are available are welcome. I may have missed some. Some instruments that I am aware of at the moment are: Keysight N5183B Rhode-Schwarz SGS100A Ni-PhaseMatrix USB 20GHz Apria Technology ULNsyn-MD20 What are some others? Thank you. Ivan Cousins ___ 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] pn3048 software
It depends upon what frequency range is desired. I have upconverted and downconverted noise sources for receiver work. On ebay I would look under noise generators. I agree that the small HP modules are expensive. The larger units from other vendors often have the step attenuators built in. Look for Noisecom, Rhode, or other makers for good deals. I am presently working in the crystal oscillator frequency range. I have enough noise generators for the frequency ranges that I am working on. Resistive combiners are easy to make if a 6dB resistive splitter in not available. Ivan Cousins On 11/4/2014 7:56 PM, Ivan.Cousins wrote: Does anyone else have the pn3048 software running on a PC-gpib system? http://www.ke5fx.com/pn3048.htm It has been a number of years since I have used a HP3048A-HP11848A system. I have two HP11848A test sets and a spare PC or two with NI GPIB cards. It looks like this will be much easier to use than the old HP 9236 computer. What trials and tribulations have people had in setting up a system with that software? One of the things that can be done is determining the noise floor of the system. To determine the noise floor I have used a noise generator with a programmable step attenuator through a resistive combiner with the oscillator under test output. Increase the attenuation until the noise source on-off level is undetectable. This is an easy way to measure the system noise floor. Noise sources are usually cheap on ebay because most people do not know how to use them. As an RF designer they are easy to use for testing receivers. Ivan Cousins ___ 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] pn3048 software
Does anyone else have the pn3048 software running on a PC-gpib system? http://www.ke5fx.com/pn3048.htm It has been a number of years since I have used a HP3048A-HP11848A system. I have two HP11848A test sets and a spare PC or two with NI GPIB cards. It looks like this will be much easier to use than the old HP 9236 computer. What trials and tribulations have people had in setting up a system with that software? One of the things that can be done is determining the noise floor of the system. To determine the noise floor I have used a noise generator with a programmable step attenuator through a resistive combiner with the oscillator under test output. Increase the attenuation until the noise source on-off level is undetectable. This is an easy way to measure the system noise floor. Noise sources are usually cheap on ebay because most people do not know how to use them. As an RF designer they are easy to use for testing receivers. Ivan Cousins ___ 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] WWVB for Time Nuts
Time nuts: Here is a prediction of how it could go on the WWVB chip situation. Moors law will under price the custom chip price in small (and even large) volumes. It already has. http://en.wikipedia.org/wiki/Moore%27s_law A WWVB receiver can now be done on an Arduino microprocessor with a little help from an antenna. The custom chip price will loose this battle. The custom chip takes longer to develop. A simple download can upgrade a simple carrier tracking receiver to a full demodulating receiver. The web site that supplies that free software upgrade can be anywhere on this planet. For lawyers to do their job they need a target. Do not give them a target to aim at. Or give them so many targets that they still can not do their job. The antenna-receiver-Arduino board can be made in China and purchased on ebay. I feel sorry for the team with patent(s), they are competing against the whole world, and do not know it yet. This is a prediction of how it could happen. Any takers. Ivan Cousins On 8/9/2014 12:56 PM, Bob Camp wrote: Hi Keep in mind that the patent(s) do not keep you from building a part for your own use. Regardless of what they do / do not patent, a TimeNut can still build (and use for themselves) what ever they wish. Now, if you (after careful examination) believe that the privately held patents keep you from building a receiver for a Federally Funded service - talk to your elected representatives. They are the ones who can / will fire up a committee to look into this sort of stuff. I think I would want to have some information on license costs before I made that phone call though. Bob On Aug 9, 2014, at 1:49 PM, Brooke Clarkebro...@pacific.net wrote: Hi: I've been reading papers by Yingsi Liang who works for Xtendwave and she seems to be the key person developing the new clocks. I've starting collecting info on my web page: http://www.prc68.com/I/Loop.shtml#PhaseMod I don't understand how Xtendwave can get patents when their work was partially funded by NIST? There are different modes that have different frame times, the Long mode takes 17 minutes for each of: Time, DST/LY state Date. That's to say it takes 51 minutes to get all three. Since the modulation format is in complete words their receiver has a problem with the inaccuracy of common watch crystals. This says that for those who have a stable LO it's much easier to receive the BPSK signal over the times needed (probably for all formats). PS a new paper Receiver Design of Radio-Controlled Clocks Based On The New WWVB Broadcast Format came out a few days ago. PPS I've been having fun with theodolites and have made a table Accuracy of Visual Fixes on my Navigation page with columns headed Time, Angle Distance based on the Earth rotation at: http://www.prc68.com/I/Nav.shtml#Accuracy The idea is that a theodolite with some angular accuracy needs to be used with a clock that has a equivalent accuracy to get a position fix within some distance. [OT] PPPS I'm also having fun looking at the pond water in my back yard. http://www.prc68.com/I/Labophot.html#Pond_Water -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.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] Reading data from Thunderbolt using an Arduino
Here is a related Arduino project. http://www.pjrc.com/teensy/td_libs_TinyGPS.html This is where I get my Arduino boards. I like the 32 bit Arduino processor for some applications. http://www.pjrc.com/store/teensy3.html Just a satisfied customer. John Cousins ___ 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.
