Re: [time-nuts] Oscilloquartz 3210 Cesium Standard
Hello, I uploaded some photos, here are the links: http://www.datafilehost.com/d/c81e3461 http://www.datafilehost.com/d/95ac3833 http://www.datafilehost.com/d/b7707109 http://www.datafilehost.com/d/809a2ef8 http://www.datafilehost.com/d/6c3381df http://www.datafilehost.com/d/c0684d5b I double checked the capacitors and they are mounted accordingly. No diode seems to be shorted. I have one cap that doesn't seem to be connected to the ground, i will check it later to see if it should or not. On first picture you can see the connectors on the small board. Two of them are the outputs, but i can't figure out what the other connectors are. Thank you! ___ 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] Oscilloquartz 3210 Cesium Standard
Did a major breakthrough! Obviously it was my fault, by mistake i swapped two connectors. My luck is that the power board has some safety elements. OK, now with the connectors in correct position I have 8.5 and 17 volts on the outputs. Getting closer ___ 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] OSA 8607 end of life notification
Fellow time-nuts, I received the OSA 8607 Family End of Life Notification from ADVA Oscilloquartz. This is the last BVA from OSA. It comes as no surprise, especially since they dropped their other OCXO business, but this was their crown jewel. Cheers, Magnus ___ 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] Oscilloquartz 3210 Cesium Standard
Ohhh that hurts and you were lucky. I always mark connectors for that exact reason. I was going to download the pictures but it kept trying to download some executable. So will not be able to look at your pictures. Regards Paul. On Tue, Sep 9, 2014 at 4:35 AM, Adrian Constantinescu adrian.valentin.constantine...@gmail.com wrote: Did a major breakthrough! Obviously it was my fault, by mistake i swapped two connectors. My luck is that the power board has some safety elements. OK, now with the connectors in correct position I have 8.5 and 17 volts on the outputs. Getting closer ___ 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] Oscilloquartz 3210 Cesium Standard
Replacing the caps could have increased voltages and exposed a fault that caused the caps to fail... As always step 1 - check voltages/regulators. Remove bridging components (diodes, power resistors) if necessary to stop the smoke and trace the circuit as any number of components could have gone open circuit. Double check your soldering just in case there is an accidental bridge in there. Good luck. Cheers J. On Tue, Sep 9, 2014 at 8:47 AM, Pete Lancashire p...@petelancashire.com wrote: If not check for shorted diodes. -pete On Sep 8, 2014 2:43 PM, paul swed paulsw...@gmail.com wrote: Adrian please copy me on the pictures also. Whats odd is the caps were bulging. You replaced them and now things are smoking. Might one have been put in backwards? Regards Paul. WB8TSL On Mon, Sep 8, 2014 at 4:49 PM, Adrian Constantinescu adrian.valentin.constantine...@gmail.com wrote: Bert Kehren via time-nuts time-nuts@... writes: or send it off list if you can not compress it. Bert Thank you for your quick reply, i will take some pictures in the morning and post them. ___ 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. -- -- Teach your kids Science, or somebody else will :/ ja...@ball.net vk2...@google.com vk2f...@google.com callsign: vk2vjb ___ 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] Oscilloquartz 3210 Cesium Standard
yes I got these executable too, and therefore did not continued 73 Alex On 9/9/2014 5:59 AM, paul swed wrote: Ohhh that hurts and you were lucky. I always mark connectors for that exact reason. I was going to download the pictures but it kept trying to download some executable. So will not be able to look at your pictures. Regards Paul. On Tue, Sep 9, 2014 at 4:35 AM, Adrian Constantinescu adrian.valentin.constantine...@gmail.com wrote: Did a major breakthrough! Obviously it was my fault, by mistake i swapped two connectors. My luck is that the power board has some safety elements. OK, now with the connectors in correct position I have 8.5 and 17 volts on the outputs. Getting closer ___ 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] Oscilloquartz 3210 Cesium Standard
I forgot to tell you to uncheck the download manager thing, that's why it is downloading .exe. Anyway, i ran some test today, i unplugged the high voltage driver and found out that instead of 10 volts on one output i now have 13-15 volts, which means that either it is a bad filter, or the pwm feedback is bad. On the other hand, the 24 volts output remains 17 volts no matter what, which would probably indicate either a bad pwm controller or a bad converter. I figured out the pwm controller and the mosfet for the 24 volts voltage, and i will put a scope tomorrow to see what happens, but i was unable to figure out where the 10 volts voltage is coming from. I also found a technical manual for osa 5585, but it is rather ambiguous. From it i found out that the input of the power board is on the db15 connector, but it seems there are some missing voltages from it. But one thing at the time. I have 23.5V on the input which is exactly what is written on the power supply. So i must be able to obtain the 10 and 24 voltages. ___ 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] Arduino Rb NTP server: good news, bad news, a photo
I've done some more work on the code, mostly in the area of health monitoring -- it's able to look at whether the GPS is locked, whether the Rb is locked, and whether the PLL has a good capture, and decide accordingly whether to enable 1PPS and whether to report a good lock on NTP. It will holdover on the Rb if it was previously in an ideal state and the GPS lock (but nothing else) is lost. I also tidied things up (relatively speaking), moved them into a case, and took a picture: anyone who wants to see what the build looks like can take a look at https://www.flickr.com/photos/hobbified/14999762988/ . And then, minutes after taking that picture, I shorted something that I shouldn't have and fried the Due. I think everything else survived (I see 1PPS and serial out of the GPS, and 10MHz out of the Rb) but I'm out of business until I can replace that board, and the supplier is in Australia. Andrew ___ 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] Finally got around to modifying my Fluke 845ab with LED's
No web page, but a little description here. It has changed quite a bit from the original description. Now uses TAOS color sensors. Suppors Melexis IR thermometer chips. Has 16 bit A/Ds. Processor is an ATMEGA 1284. The control program is based on Lady Heather. Besides LEDs it can also charge/discharge/analyze batteries, measure power converter/supply efficiency, etc http://budgetlightforum.com/node/12296 CIrcuit board: http://img69.imageshack.us/img69/3782/luxor.png Sphere in action: http://img515.imageshack.us/img515/4288/spherew.jpg BTW, the PWM sensor is a silicon phototransistor with not much blue light sensitivity... - Do you have a web page on the LED analyzer/integrating sphere? ___ 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] Finally got around to modifying my Fluke 845ab with LED's
Whoops... that last message should have gone to volt-nuts... ___ 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] Cutler NAA on 24.0kHz....
A short update on NAA as some sort of reference. Have completed a simple direct conversion circuit using a NE612. A few minor changes because the system only needs 100 Hz or less. It is essentially this circuit. http://www.qsl.net/ik2pii/lf/dcrx136.htm Its receiving NAA just fine with about 1 Vpp out and the official MSK is there. No attempt to use the tracor 900 circuit yet. Also the LO is a HP 3335a locked to the station RB. Somewhat a massive system connected to a small board. A start none the less. Will not be hard to build the tracor d-msk-r to see what happens. Regards Paul WB8TSL On Wed, Aug 20, 2014 at 9:01 AM, Bill Riches bill.ric...@verizon.net wrote: NAA -50 dbm (1 MV) using a mini-whip. -60 dbm on the k9ay loop. Mini-whip is full of surprises. 73, Bill, WA2DVU Cape May, NJ -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Tuesday, August 19, 2014 9:51 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Cutler NAA on 24.0kHz Did measure NAA near Boston 8000uv using a dipole for 80 meters. Looking at various vlf receivers it looks like a LPF or maybe a BPF filter to a ne602 mixer followed by a tl081opamp LPF makes a direct conversion receiver. Then hit the tracor d-msk-r. Regards Paul WB8TSL On Mon, Aug 18, 2014 at 2:34 PM, Charles Steinmetz csteinm...@yandex.com wrote: Paul wrote: Nat Semi App Note 72 page 18, par. 6.4 shows the configuration for bandpass active filter. This matches the last LM3900 stage, so you would seem to be correct. The shift in filter frequency for 200bps is because the higher modulation rate results in a greater frequency shift. It's like 50hz instead of the 25hz of the 100bps rate. Robert wrote: It's simple, but not obvious. The LM3900 is a Norton amplifier, and while it has differential inputs they are current driven. * * * Both the upper amplifier and the second lower amplifier have 1M feedback resistors, and + inputs fed 10V by 1M bias resistors. That would bias the output at near the supply rail, turning these stages into something like half-wave rectifiers. Since the first lower stage has a 2M bias resistor it idles at about half supply, and behaves as a simple inverter. * * * combining the two outputs produces a negative going full wave rectification of the signal. The fourth LM3900 stage looks like an inverting bandpass filter, but I'd have to dig out some reference books to determine its behavior in more detail. As f or the 100-200 switch I'm confused, why would the bandpass frequency be lowered for the higher modulation rate? The circuit as a whole operates as a frequency doubler using full-wave rectification and filtering. The rx LO is 100Hz below the nominal carrier frequency, so in normal (non-MSK) mode, the IF frequency is 100Hz. Referring to the MSK addendum, a received 200 baud MSK signal is 50Hz below nominal, and a 100 baud MSK signal is 25Hz below nominal. With the LO 100 Hz below nominal, this makes the IF frequency 50Hz when receiving a 200 baud MSK signal, and 75 Hz when receiving a 100 baud MSK signal. After doubling, these become 100 Hz (200 baud) and 150 Hz (100 baud), so the BPF is switchable between 100Hz and 150Hz. They used a FET to chop the 150Hz (100 baud) signal with a 50Hz square wave. I can't say I'm impressed with the design, even for the era. The whole instrument is built mostly with LM3900s, which makes it thousands (maybe even millions) of times noisier than it would be if it had been properly designed with standard op-amps. It may work more or less, but it's a fugly way to get there. There are other questionable choices (like the FET chopper, an overall design that depends on lots of one-shots, etc.). The designers knew about the LM301 (there is one in the unit), so there was really no excuse for using LM3900s. Yeah, the 301 was more expensive -- but this was supposed to be a state-of-the-art measuring device for characterizing good OCXOs down to PPB or below. I simulated the MSK board in LTspice. Let me know (OFFLIST ONLY, please) if you would like the files to play with (662kB ZIP file). (Note that these won't do you any good if you're not an LTspice user.) Again, please do not clutter the list with requests for files -- OFFLIST ONLY, please (check your headers carefully before you hit Send). Best regards, Charles ___ 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] Oscilloquartz 3210 Cesium Standard
Untick the box and the download button will apear! Raj At 09-09-2014, you wrote: I was going to download the pictures but it kept trying to download some executable. So will not be able to look at your pictures. Regards Paul. ___ 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.
