Re: [time-nuts] Distributiuon Amlifier Altinex DA1804NT
I did couple of other measurements, using MV89A as a ref source for 5386A DATUM OCXO is DUT: http://www.patoka.ca/OCXO/OCXO-MV89Aref-DATUM-AD.png http://www.patoka.ca/OCXO/OCXO-MV89Aref-DATUM-TM.png http://www.patoka.ca/OCXO/OCXO-MV89Aref-DATUM-FD.png Drift(Hz/sec): -2.20E-7 Trimble TB is DUT: http://www.patoka.ca/OCXO/OCXO-MV89Aref-TB-AD.png http://www.patoka.ca/OCXO/OCXO-MV89Aref-TB-TM.png http://www.patoka.ca/OCXO/OCXO-MV89Aref-TB-FD.png Drift(Hz/sec): -5.17E-8 Looking to the drift values, the case with T-Bolt has better value, I think. But it has bigger spikes. On 2015-05-29 18:59, Bob Camp wrote: Hi I think that looks about as good as your counter can do. The slope down at the start is the resolution of the counter. The slope up on the right is the actual stability of the oscillator. Bob On May 29, 2015, at 9:52 AM, Vlad wrote: Hello, I've finished the test. Here is the links to charts: http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-AD.png http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-PD.png http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A.png It looks different, but its not better, I think. Regards, Vlad On 2015-05-28 23:21, Vlad wrote: Bob, You are correct. I am using HP 5386A. And its only HP counter I have. I set Gate time equal to 10sec. May be this gate time is an issue ? The other settings is .1s, and 1s. Meantime, I did switch ref signal source from Trimble TB to Oscilloquarz 8663-SX OCXO and connected MV89A to counter input. 8 hours later, I'll see what will be on chart. Regards, Vlad On 2015-05-28 21:50, Bob Camp wrote: Hi *IF* I’m understanding you correctly, you are measuring this data with an HP 5386. That’s only a 4 ns counter. I agree with Tom that there is something weird in your setup, but that still does not help the basic limit of the counter’s resolution. You will need to be out around 1,000 seconds or more to get to the noise on the OCXO. At any time shorter than that you are either measuring the counter’s noise or noise in your setup. If you have one, a 5335 would be a better counter to use than the 5386. Bob On May 27, 2015, at 10:04 PM, Vlad wrote: Hello, Recently, I acquired video distribution amplifier (model Altinex DA1804NT). It says it could handle 350Mhz. I am planing to use it to split 10Mhz Ref signal from my OCXO. This OCXO I bought on auction site. It has Oscilloquarz model 8663-SX plus some components which give me 4 outputs - 2 sines and two squares. After few days of "warm up" I did measurement of ADV from one of the sine outputs and then measurement of the same sine signal from OCXO, but this time through the Altinex DA. Each test took 8 hours. Attached is the results. NOTE: on the ALTINEX* charts I forgot to change the label for OCXO. So, its not DATUM. It is Oscilloquarz 8663-SX I was using Trimble TB as a ref signal for HP 5386 Since I have no instruments which measuring phase noise, I am interesting, what will be the quick method to measure the phase noise for that DA ? -- WBW, V.P.___ 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. -- WBW, V.P. ___ 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. -- WBW, V.P. ___ 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] 3048A software question
> The overall result is a bit disappointing, given what I set out to > accomplish. I can now compare the results from PN3048 in baseband noise > mode to get absolute measurements, which will be useful. The DOS code > produces calibration and result files which are unreadable to the RMB > version and PN3048, so my master plan to use the DOS cal data with > RMB/PN3048 has been foiled. Just to clarify, the CALDATAHI and CALDATALO files generated by the RMB version under the HTBasic emulator should be usable by your PN3048 installation. Copy them out of the HTBasic working directory into the directory with the PN3048.EXE executable. > All good clean fun, but at pennies per hour, a timepod looks like a bargain. http://i0.kym-cdn.com/photos/images/newsfeed/000/538/731/0fc.gif :) -- john, KE5FX Miles Design LLC ___ 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] KS-24361 "NO GPS" - again
Hi Quick “front end” check list: The old Oncore modules were not the greatest for sensitivity. Compared to what you get today, they are a bit deaf. What that turns out to mean is that you need a bit more antenna gain with them than with a newer module (either a newer Oncore or a newer part from somebody else). Something around 30 db of antenna pre-amp gain with < 10 db of coax loss is about right for them. They will overload if you get up to the 39+ db preamp range and < 3 db of coax loss. How much they overload depends on the crud in your local environment. The Lucent boxes (like just about all similar gizmos) put out +5V to the antenna . There are indeed antennas that need > 7V to do their thing. How well they work / if they work at 5V - who knows. I would not try it. Since you get a “40 - 50” db signal to noise once you lock on to a sat, the preamp gain is a bit weird. It very much impacts satellite acquisition, and has less impact once you are locked on. A marginal antenna gain can give you a “long start”, but then lock on to a number of sats once things get going. That can make it tricky to spot the problem. Bob > On May 30, 2015, at 9:38 AM, Martin VE3OAT wrote: > > Ulli, > Sorry that I haven't been following your correspondence so I am coming into > the middle of this. The fact that you receive so few satellites says to me > that there is a problem at the front end. You said you had changed the cable > to the antenna and the antenna itself so those parts seem OK at least. Are > you using an active antenna and does the unit provide the required voltage > for it? Sorry if you have already checked that. > ... MartinVE3OAT > > Ulli wrote : > > At least, i saw 1 or 2 satellites from time to time. > > > ___ > 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] 3048A software question
Hi All, Using the A.01.01 DOS version of the 3048A code and the B.01.01 version of the HP-IB Command Library (thanks Adrian), with an 82335 GPIB card, works with DOS6.22, DOS7.1 (WIN98) and FREEDOS1.1. All that's required is to load the HPIB.SYS (config.sys) and ensure the selected ROM address and IRQ are available. It does not work in a win98 command windows; I spent no time trying to figure our why. It does not work with later GPIB cards (82340), as these are I/O mapped, and the B.01.01 drivers require memory mapped cards. Not having an old PC around, I used an Agilent 54845A, with the HDD reconfigured for dual booting. It's kinda cool having the PC in the rack with the 3048A kit, but there was a bit to learn to get the scope to run two GPIB cards. I upgraded the scope's HDD to an SSD, as the old drive had *LOTS* of hours on it. The overall result is a bit disappointing, given what I set out to accomplish. I can now compare the results from PN3048 in baseband noise mode to get absolute measurements, which will be useful. The DOS code produces calibration and result files which are unreadable to the RMB version and PN3048, so my master plan to use the DOS cal data with RMB/PN3048 has been foiled. On the positive side, I know the 3048A hardware is good, the system meets its performance specs, and I can do the 3-cornered hat measurements on my 100MHz PLLs which PN3048 can't do. All good clean fun, but at pennies per hour, a timepod looks like a bargain. Cheers, david David, the 82335 drivers came with the complete SW package that I sent you. I don't know if the drivers and SW are running with any more recent or non MS versions than MS-DOS 6.0. But, it's as easy to find out as it gets. Back in the day the whole OS fitted on a floppy disk and 640k of memory, together with a 33 MHz 486 did the job. Btw. a modern 2,000 MHz or something clocked PC with 4,000,000k of memory doesn't seem to work any faster... And, no, even if you get MS-DOS installed on it, you're not gonna have much fun. Adrian davidh schrieb: Folks, I'm also working on getting the MSDOS version running. What is the most recent version of DOS that people have found to work with the A 01.01 version. Also, can anyone advise where the command drivers for the 82335 can be found? Cheers, david Hi Adrian, Got the spec lines working now, thanks! Yes, the DOS version. I was hoping for an updated user manual for that version as the manual describes the other software version, and maybe a slightly later sw version. Oh well. Thanks for you help! Said On Feb 17, 2012, at 5:06, Adrian wrote: Said, are you using the Opt. 311 (MS-DOS) software? I don't know of any more recent versions. To answer your initial question: You can not change anything on the diagram _after_ the measurement, not even the title. The spec lines will be visible only when you have defined them prior to starting the measurement. Regards, Adrian saidjack-ydxpq3io04c-xmd5yjdbdmrexy1tmh2...@public.gmane.org schrieb: Hello team, I am trying to get an HP 3048A system up and running, and I am having problems with enabling spec limit lines on the graph. I can enter the spec line data under the "manipulate results" then "spec lines" menu, but the lines I entered are not visible. There are the standard spec lines visible when I do the internal noise floor test, so I know this should work. Does anyone know how to enable these properly? The user manual doesn't talk about this, and it is written for an older version of the software anyway's. Also, I have software version A 01.01 from 1994, does anyone have any more recent software version? Thanks in advance, Said ___ time-nuts mailing list -- time-nuts-jsktletqltm-xmd5yjdbdmrexy1tmh2...@public.gmane.org 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-jsktletqltm-xmd5yjdbdmrexy1tmh2...@public.gmane.org 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-jsktletq...@public.gmane.org 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] KS-24361 "NO GPS" - again
Ulli, Sorry that I haven't been following your correspondence so I am coming into the middle of this. The fact that you receive so few satellites says to me that there is a problem at the front end. You said you had changed the cable to the antenna and the antenna itself so those parts seem OK at least. Are you using an active antenna and does the unit provide the required voltage for it? Sorry if you have already checked that. ... MartinVE3OAT Ulli wrote : > At least, i saw 1 or 2 satellites from time to time. ___ 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] solved: KS-24361 "NO GPS" - again
Hi The computer programs are all looking at the serial output of the GPS module in the box. When it says 3 sat’s that is all it can see. There are three basic reasons why this can be: 1) It still does not have an almanac / ephemeris from the GPS system and is downloading it. Without that data these modules can’t grab a full set of sats. They do not have the processing horsepower of more modern modules. 2) It *has* the data, but it’s got the wrong one. It’s confused and may or may not straighten it’s self out. We’ve gone back and forth on this one. There is info in the archives. 3) You simply can not see enough sat’s from you antenna location. Even with less than perfect antenna locations I can get > 8 sats (on an 8 channel receiver) at all times. The worst case is a combination of all of the above. If you have only one or two sats in view at some times, it will take a *long* time to get the almanac and to figure out an error. It also will take a very long time to complete a survey. One and two are somewhat Motorola specific. The third one applies to just about any module trying to do this stuff. The first two are just startup issues. The third is with you forever. When you start dropping below 4 sats the timing (and thus stability of the box) degrades. With multi path involved there is no simple way to know just how bad things will get in a 1 or 2 sat situation. Bob > On May 29, 2015, at 2:46 AM, Mod Mix wrote: > > It's simply a matter of time - this morning, all satellites are back again > and clock is locked. > Didn't know this may take so much time... > Thanks to all responding! > Ulli > >> Wall, again some hours later at least the LED show the normal picture. >> Though, Ulrich's program is still showing no more than two satellites. >> Do I have to be more patient? >> Ulli >> >> Am 20.05.2015 um 20:59 schrieb Mod Mix: >>> Hi, >>> my KS-24361 REF 1 / REF 0 combo was running nicely for many weeks. >>> To check a newly received REF 0 it was connected instead of the nicely >>> runnning one. >>> Did almost fine - except: NO GPS stayed solid on for about an hour. >>> At leat, i saw 1 or 2 satellites from time to time. >>> When I put back the original one, it behaves the same: solid NO GPS for >>> hours .-( >>> Does not see any satellite at all... >>> Interconnect cable was changed... >>> GPS antenna was changed... >>> No success... >>> Any idea how to make it tracking GPS again? >>> Thank you in advance, >>> Ulli >>> >>> ___ >>> 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. ___ 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] Small time server for mobile use.
Hi sorry for a possibly OT post. Has anyone had practical experience with small commercially available time servers / ntp servers suitable for mobile use in a vehicle. The use case is I am in need of an accurate (ie. within 100 ms) time source for several pc's in moving vehicle.Being able to run directly off a 13.8 or 28 VDC source would be a major plus but AC power is also available. Hold over if there are gaps in GPS coverage is also a major plus. We already have a GPS with a 1 pps output, but an integrated box with it's own GPS would be best. Yes I am aware I could feed a 1 pps signal into a laptop and use that as a time server and I may end up going that route. There is a small Ethernet LAN in the vehicle. The pc's currently get their time via a wireless connection to various NTP servers. I need to be able to ensure accurate time on the PC's if there is no wireless coverage. This is for a one off project so piecing together various parts is an option but a single box COTS solution would be nice. I've found a few candidates via web searches but would welcome any feed back. Thanks in advance Mark Spencer ___ Raspberry Pi perhaps? http://www.satsignal.eu/ntp/Raspberry-Pi-quickstart.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ 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] USB problems and solutions - Some what Off Topic
I originally replied offline, but given the level of discussion, it seems appropriate to put this here. Take a look at USBOblivion which will vape all existing registry entries etc. for USB devices. Next time you connect they will reload. The only problem is that COM port number will most likely be changed. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Cash Olsen Sent: 29 May 2015 20:18 To: time-nuts@febo.com Subject: [time-nuts] USB problems and solutions - Some what Off Topic I have been plagued with hard crashes of the computer when plugging in and unplugging USB devices. I have generally determined that some of the USB to serial devices are the worst offenders. I am also suspicious of some of the hubs. I wander if even the operating system is partly to blame. I'm using Windows Vista, and have several different USB to serial adapters. Most are Silicon Labs and Prolific. I thought I had the problem resolved with Prolific by over-riding the driver and installing an earlier version but Windows may have updated the driver, that seems to be a common problem. I'm coming to time-nuts because I remember that at least one member had a very large number of adapters on one computer, so I'm hoping to find some help. I don't generally seem to have trouble with other USB devices, just the serial adapters. One further issue, the COM ports are marked in use from 3 to 50+ and I'm only using at any one time 3 or 4. Can I clean up the assignments and can I make the assignments static after connect and reconnect or restarting the computer? -- S. Cash Olsen KD5SSJ ARRL Technical Specialist ___ 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] solved: KS-24361 "NO GPS" - again
It's simply a matter of time - this morning, all satellites are back again and clock is locked. Didn't know this may take so much time... Thanks to all responding! Ulli Wall, again some hours later at least the LED show the normal picture. Though, Ulrich's program is still showing no more than two satellites. Do I have to be more patient? Ulli Am 20.05.2015 um 20:59 schrieb Mod Mix: Hi, my KS-24361 REF 1 / REF 0 combo was running nicely for many weeks. To check a newly received REF 0 it was connected instead of the nicely runnning one. Did almost fine - except: NO GPS stayed solid on for about an hour. At leat, i saw 1 or 2 satellites from time to time. When I put back the original one, it behaves the same: solid NO GPS for hours .-( Does not see any satellite at all... Interconnect cable was changed... GPS antenna was changed... No success... Any idea how to make it tracking GPS again? Thank you in advance, Ulli ___ 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.
