Re: [time-nuts] low noise multiplication to 100 MHz
Am 22.01.2016 um 22:40 schrieb jimlux: the oscillator is a HCMOS output, so figure swinging about 3.5V Output.. I'm feeding differential clock inputs on ADCs. I'll bet a +/- 300mV swing would work. 4)Title said "Low Noise" needs better definition as to what kind of noise and how far down. Are we to be concerned about harmonic and spur content as compared to real random white noise? This is time-nuts.. it has to be perfect.. But realistically, my source is probably going to be about -90dBc/Hz at 1 Hz, -125 at 10Hz, -145 at 100 Hz. I'm going up by a factor of 10, so I'd expect 20 dB worse plus a little..(nothing is perfect, eh?) Call it maybe -100 to -95 at 10 Hz, -125 to -120 at 100 Hz and so forth. harmonics are interesting: it's the sample clock into an ADC. So harmonics of the 100 aren't a big deal. harmonics of the 10 or 20 are. If you have significant 90 or 110 contaminating the 100, then you get weird spurs.. (I had this problem on a software radio where the 50 MHz sample clock was contaminated with some 66 MHz from the CPU) Spurs cause the same issues. ON the other hand... spurs that are pretty low don't make much difference if you're digitizing a signal that is close to the noise floor: the spur multiplied by the desired signal is usually lower and down in the noise. Strong CW in band signals, though, are a real pain. < https://picasaweb.google.com/103357048842463945642/Tronix#6079270188048833778 > I think that top left board would not be far away: in : 10 MHz LVDS or CMOS in: 3V3 out: 100 MHz CMOS 3V3 just a few hours wall clock time from layout to working as a ham radio weekender, so please excuse my diy home board production process. Ok, the use of a 4046 descendant may not be the last word from a timenut perspective, but I'll redo it with an osc of my own anyway. Divider 100/10 is a LVC163 (161?) + lvc04. < http://www.crystek.com/crystal/spec-sheets/vcxo/CVHD-950.pdf > Digi-Key has 153 of them on a tape and 441 of a similar one , even cheaper that seems to point to the same data sheet. < http://www.digikey.de/product-detail/de/CVHD-950-100.000/744-1213-ND/1644128 > You can get the few dB missing close-in by transfer from your reference. In the picture: The bottom row of boards is a doubler 100->200 MHz using 2*BF862, slight gain, and diode doubler 200 -> 400 MHz, SAW filter to get rid of 100/200/300/500/600 +/-10 etc, post amp to get a usable level again. Still missing 400-> 800, 800->1600 to feed _my_ ADC clock input. regards, Gerhard ___ 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] HP5370B & HP5345B Front-End IC Redesign Effort
Mat I can help out with a few design ideas and check your calculations.I only have a 5370A so I probably cant help with dispersion measurements. I'm tempted to replace the power hungry 5370A with something with a power consumption of under 10W and noise (jitter) at least 5x smaller. Bruce On Saturday, 23 January 2016 3:12 PM, Mathew Breton wrote: I was gifted an HP 5370B with the usual problem: front-end problems, probably due to overstress. It is currently up and running again with a set of 5345A series A3/A4 boards as I wasn't able to get a cheap pair of 5088-706x hybrid ICs. This sounds like a common problem. As a result, I'm designing an open-source drop-in (hopefully) replacement. My hat is off to the original IC designer, as it is not a trivial effort due to the wide input signal common-mode range, and very tight trigger timing requirements. Other items (like the E-ECL) output) are also adding a bit of extra effort. I'm hoping that someone(s) might be interested in working with me on it. I would like to have my assumptions and math checked before I start the detailed design phase, and perhaps contribute some better ideas. In addition, it would be really helpful if someone could run a few rise-time dispersion tests on an instrument with a working "B"-series A3/A4 PCB set (my unit obviously doesn't qualify). Regards, Mat Breton ___ 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] low noise multiplication to 100 MHz
Moin Ulrich, On Fri, 22 Jan 2016 10:00:58 -0800 "Tom Van Baak" wrote: > The attached plot is from Dr. Ulrich Rohde (ka2...@aol.com) > "a PDF of a noise plot , AM FM noise, important technical data" > (he had trouble posting it to the list, so I'm doing it for him) > > R_S_SMA_SIG_GEN_100MHz-02.pdf Could you explain what we are looking at here? Attila Kinali -- Reading can seriously damage your ignorance. -- unknown ___ 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] HP5370B & HP5345B Front-End IC Redesign Effort
Hi Mathew, As someone who just lost their stop channel, I'm extremely interested in this project! Jim Palfreyman On 23 January 2016 at 09:14, Mathew Breton wrote: > I was gifted an HP 5370B with the usual problem: front-end problems, > probably due to overstress. It is currently up and running again with a set > of 5345A series A3/A4 boards as I wasn't able to get a cheap pair of > 5088-706x hybrid ICs. > This sounds like a common problem. As a result, I'm designing an > open-source drop-in (hopefully) replacement. My hat is off to the original > IC designer, as it is not a trivial effort due to the wide input signal > common-mode range, and very tight trigger timing requirements. Other items > (like the E-ECL) output) are also adding a bit of extra effort. > I'm hoping that someone(s) might be interested in working with me on it. I > would like to have my assumptions and math checked before I start the > detailed design phase, and perhaps contribute some better ideas. > In addition, it would be really helpful if someone could run a few > rise-time dispersion tests on an instrument with a working "B"-series A3/A4 > PCB set (my unit obviously doesn't qualify). > Regards, > Mat Breton > ___ > 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] low noise multiplication to 100 MHz
Do any of the SiLabs 'low jitter' synthesiser / clock generators / jitter attenuators etc help? Alan ___ 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] Navsymm Proteus GPS CDU Software (Brendan Giles)
I was the project manager for this piece of equipment. I have a copy of the CDU program. I have recently run it on a Windows 10 system. Let me know where to send you a copy. Brendan ___ 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] Navsymm Proteus GPS CDU Software
Hi Thomas, If you haven't already seen them I made a couple of posts regarding this unit last November in response to a similar question, and these might help with running the software etc. I've uploaded a file containing the manual and software to Mega.nz .. https://mega.nz/#!eVggzQDD!BD76z_UMLGtjhJmvO-APeW-A7bMIVEY7oZUI389IEAE A bit of a messy link but they encrypt all downloads as a matter of course and that includes the key, any problems please let me know and I can send it direct but decided to post it here in case others are interested. If someone could upload this to Didier's manual site that would be appreciated, I've had a few problems again recently with attempted uploads from here. Regards Nigel GM8PZR Hello Time-Nuts, I have recently come into possession of a Navsymm Proteus GPS Time and Frequency Generator. Also known under Navstar Systems. There have been various postings about this piece of kit, in some of which there was a mention of the CDU software which allows to configure it. The thing powers up but does not lock on. The manual says this could be the case if it was moved since last locked and it may need configuring. To cut a long story short, does anybody have the CDU software and could it be “shared”? It seems to need an old-style PC but that won’t be a problem around here. I will meanwhile check if any sense can be made of its outputs, in case there is some hardware problem. Thanks in advance, Thomas. ___ 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] HP5370B & HP5345B Front-End IC Redesign Effort
I have 5370s and 5345 working and then those that aren't so interested. I did play with some ecl chips but they worked poorly. Can't do any clever math or dispersion... But good with a soldering iron. Regards Paul WB8TSL On Sat, Jan 23, 2016 at 1:23 AM, Bruce Griffiths wrote: > Mat > > I can help out with a few design ideas and check your calculations.I only > have a 5370A so I probably cant help with dispersion measurements. > > I'm tempted to replace the power hungry 5370A with something with a power > consumption of under 10W and noise (jitter) at least 5x smaller. > > Bruce > > On Saturday, 23 January 2016 3:12 PM, Mathew Breton > wrote: > > > I was gifted an HP 5370B with the usual problem: front-end problems, > probably due to overstress. It is currently up and running again with a set > of 5345A series A3/A4 boards as I wasn't able to get a cheap pair of > 5088-706x hybrid ICs. > This sounds like a common problem. As a result, I'm designing an > open-source drop-in (hopefully) replacement. My hat is off to the original > IC designer, as it is not a trivial effort due to the wide input signal > common-mode range, and very tight trigger timing requirements. Other items > (like the E-ECL) output) are also adding a bit of extra effort. > I'm hoping that someone(s) might be interested in working with me on it. I > would like to have my assumptions and math checked before I start the > detailed design phase, and perhaps contribute some better ideas. > In addition, it would be really helpful if someone could run a few > rise-time dispersion tests on an instrument with a working "B"-series A3/A4 > PCB set (my unit obviously doesn't qualify). > Regards, > Mat Breton > ___ > 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.
