[time-nuts] IOTECH 488 EPROM
The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] Temex LPFRS-01
Yes... Thank you, and the others, for the suggestions for cleaning/reviving the unit, but I can't recommend to my friend to keep a pile of rust (if water damage really is the problem) advertised as an used working item. Regards, bbg On 3/17/2012 4:10 PM, Azelio Boriani wrote: LPFRS from fluke.l? OK, then open it up and clean it, the LPFRS from fluke.l suffers from high humidity/water immersion and usually are very rusty inside. I have received one that was very bad but after cleaning with tetrachloroethylene (translated with google) it is working properly, maybe it will fail soon but now works. I complained with fluke.l and he refunded me without asking to ship back the LPFRS. TIP: handle with extreme care an opened LPFRS, there is a flexible PCB that holds the DB9 connector that can tear in the corners. On Sat, Mar 17, 2012 at 10:59 AM, MailListsli...@medesign.ro wrote: Hello all, a friend purchased from the bay asubj. in the LPRO configuration. After some problems encountered during the first power ups, he asked for help - I'm passing the questions further... After about 9 minutes of warm-up from room temperature (22°C) the lock signal goes low, but after a short time starts to switch low/high with decreasing low periods, until it remains high with short low pulses, spaced at about 2 seconds. After power-down, and sufficient cooling time, the cycle repeats. First step was to reapply the thermal interface to the integrated Al radiator, which helped a bit, the time during which the unit is locked growing slightly. Next step was forced cooling, which helped more, so the lock loss could be attributed with high probability to elevated operating temperatures. The temperature of the base plate (integrated Al radiator) at which lock gets lost is about 40°C, so for a reasonable operation it should not pass about 36°C, at which the power consumption raises to about 17W. That also means that for a 1°C/W heat sinking - obtainable with a larger passive HS or active cooling - operation above 30°C ambient gets practically impossible (except refrigeration, Peltier, etc.). Any further help or suggestions are welcome. Regards, bbg ___ 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] Temex LPFRS-01
After further testing, including a simple lost lock detector (2 555s: manually resettable bistable + multivibrator and a buzzer), with the serial port the whole picture looks even grimmer. Most parameters seem to be in nominal range, relatively stable after warmup, with the notable exception of a very low dip detector amplitude, which fluctuates, and also gets lower with increasing temperature. Even at lower temperatures, than first mentioned, lock losses do appear sporadically. Regarding the adjusting of the LPFRS's frequency, it seems it's possible just discreetly, even with the analog input, the smallest step being 1E-11, as the analog way is, with high probability, also going through an 8 bit ADC and the CPU. To have a more fine control, the access directly to the internal C-Field adjustment circuit seems necessary - maybe a future project with a fully working unit. Regards, bbg PS: Mark, is the busted one from the same source, mentioned earlier? On 3/17/2012 6:20 PM, Mark Spencer wrote: This is interesting. I have two temex units one which works and one which has similar issues to yours. The performance of my working one is quite good. (If you want any specifics let me know and I can provide more details in a few days, but I recall it is notably better than either of my 5680's. I found the performance was best with a fan blowing air over the heat sink.) I'm glad you were able to get a refund for yours. I gave up debating with the seller of my defective unit and wrote it off to experience (also I figured since it did put out a signal and locked up from time to time that it wasn't entirely dead.) I probably should have pushed harder with the seller. I'll leave my busted temex in the projects pile for now. With the benefit of hindsight the picture I saw on ebay of the non working unit was not very confidence inspiring and I wish I had bought a second unit from the original source. The first unit was very clean and came with an attached heat sink and worked fine from day one. I've been contemplating building a system to periodically adjust the frequency and I want a second working unit before I put any time and effort into sorting out a pic tic micro controller solution. Please excuse typos and top posting sending from pda. -- On Sat, 17 Mar, 2012 10:58 AM EDT Azelio Boriani wrote: Yes, correct. The problem is that I have no deionized water nor a suitable oven. The use of the tetrachloroethylene has simplified the procedure for me (after all I was refunded, should the Rb fail it is not a money loss). Anyway I'll try to locate a supply for high quality deionized water, the oven can be built... I have one item to process more carefully. On Sat, Mar 17, 2012 at 3:21 PM, Bob Campli...@rtty.us wrote: Hi If it is water immersion damage, wash it in soap and water. Then rinse it in hot deionized water (above 10 mega ohms if you can get it). After that bake it at 80C with good air flow for 24 hours. It still may rust, but most of the guck from the water will be gone. I once spent a lot of quality time with many truck loads of flood damaged gear Bob On Mar 17, 2012, at 10:10 AM, Azelio Borianiazelio.bori...@screen.it wrote: LPFRS from fluke.l? OK, then open it up and clean it, the LPFRS from fluke.l suffers from high humidity/water immersion and usually are very rusty inside. I have received one that was very bad but after cleaning with tetrachloroethylene (translated with google) it is working properly, maybe it will fail soon but now works. I complained with fluke.l and he refunded me without asking to ship back the LPFRS. TIP: handle with extreme care an opened LPFRS, there is a flexible PCB that holds the DB9 connector that can tear in the corners. On Sat, Mar 17, 2012 at 10:59 AM, MailListsli...@medesign.ro wrote: Hello all, a friend purchased from the bay asubj. in the LPRO configuration. After some problems encountered during the first power ups, he asked for help - I'm passing the questions further... After about 9 minutes of warm-up from room temperature (22°C) the lock signal goes low, but after a short time starts to switch low/high with decreasing low periods, until it remains high with short low pulses, spaced at about 2 seconds. After power-down, and sufficient cooling time, the cycle repeats. First step was to reapply the thermal interface to the integrated Al radiator, which helped a bit, the time during which the unit is locked growing slightly. Next step was forced cooling, which helped more, so the lock loss could be attributed with high probability to elevated operating temperatures. The temperature of the base plate (integrated Al radiator) at which lock gets lost is about 40°C, so for a reasonable operation it should not pass about 36°C, at which the power consumption raises to about 17W. That also means that for a 1°C/W heat sinking - obtainable with a larger passive HS or
Re: [time-nuts] IOTECH 488 EPROM
If it's a 44pin plcc I can burn it. Dale Robertson NV8U -Original Message- From: Joseph Gray jg...@zianet.com Sent: Sunday, March 18, 2012 3:18am To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] WWVB BPSK Receiver Project? (fwd)
Poul-Henning Kamp schrieb: In message 4f64f279.4040...@arcor.de, ehydra writes: Marek Peca schrieb: This was almost the only reason for ferrite rod -- simplicity and attenuation of TVs, some LCDs, 50Hz etc. If you make the antenna about 10x bigger you can omit the whole ferrite. I have used two antennas, an unloade air-coil, actually plastic-lid-coil: http://phk.freebsd.dk/loran-c/Antenna/ Yeah. I remember the red. The degaussing coil of old TVs can work. Some resonate at 50KHz which is a little low but it depends on the manufacturer. So try it. and a vertical monopole based on a Chris Trask design I can highly recommend: http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf In my implementation, it covered DC to 200MHz until I low-pass'ed it. His designs are always a good source but this one is AC-coupled ;-) A CD4069 is all one needs for first experiments. I was satisfied. - Henry -- ehydra.dyndns.info ___ 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 BPSK Receiver Project? (fwd)
In message 4f65d971.8070...@arcor.de, ehydra writes: http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf In my implementation, it covered DC to 200MHz until I low-pass'ed it. His designs are always a good source but this one is AC-coupled ;-) Not in my implementation, I have eliminated the input capacitor because the active element is 3cm from the PCB, and I drive the output with a centertapped transformer. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] IOTECH 488 EPROM
Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] WWVB BPSK Receiver Project? (fwd)
I wonder because ALL of the shown circuits in his pdf are AC-coupled. It is maybe possible to servo-loop with OpAmps but surely not worth the effort. Useful too as a Scope FET-probe. - Henry Poul-Henning Kamp schrieb: In message 4f65d971.8070...@arcor.de, ehydra writes: http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf In my implementation, it covered DC to 200MHz until I low-pass'ed it. His designs are always a good source but this one is AC-coupled ;-) Not in my implementation, I have eliminated the input capacitor because the active element is 3cm from the PCB, and I drive the output with a centertapped transformer. -- ehydra.dyndns.info ___ 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] IOTECH 488 EPROM
Hello to the group. Indeed the prom changes the behavior to a full controller and the ones I listed were changed and worked. Because those were the units I had found over the years. No idea about this particular prom and such. Regards Paul WB8TSL On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham jlt...@att.net wrote: Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] WWVB phase plots
On Mar 16, 2012, at 1:32 AM, Peter Monta wrote: Attached are some more renderings of John Seamons' WWVB data. This is what one might expect from a receiver that knows when the phase reversals happen and takes them out noiselessly---re-reversing the out-of-phase bursts to recover an approximation of the usual WWVB signal. Thanks for the additional analysis Peter. Odd that there is significant phase jitter. I've added to my website the only other significant recording I made: ten minutes in the dead of night (2:27 AM MST, 9:27 UT). http://www.jks.com/wwvb/wwvb.html#10-min The phase data I extracted is the same as the two minutes of data I captured earlier. A constant pattern that repeats every minute. Certainly not the full protocol as described in the NIST paper. So maybe this test was to simply evaluate the phase modulation effects on receiving equipment (in which case it's shame we didn't find out earlier so we could do more boat-anchor compatibility testing). In an earlier message Dennis Ferguson points out that the paper doesn't fully specify the 11/14-bit minute-sync and 60-bit hour-sync codes. So it's not clear what they were actually transmitting. They do talk about using the 11-bit Barker code for autocorrelation. But the sync bits transmitted only match the Barker code if you interpret them a little bit out-of-order. ___ 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] IOTECH 488 EPROM
Paul, Have you tried this in an NI GPIB-232CV-A or a GPIB-232CT-A? I have tried to swap the data between a 232CT-A and a 232CV-A with no joy. The two units are fundamentally different. That's why I have the chips. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Sunday, March 18, 2012 9:38 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] IOTECH 488 EPROM Hello to the group. Indeed the prom changes the behavior to a full controller and the ones I listed were changed and worked. Because those were the units I had found over the years. No idea about this particular prom and such. Regards Paul WB8TSL On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham jlt...@att.net wrote: Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] IOTECH 488 EPROM
The text file doesn't mention any particular model numbers, it just lists NI, along with others. I want to make sure that the NI GPIB-232CV-A will work with the other firmware. Has anyone done this specific model? Joe Gray W5JG On Sun, Mar 18, 2012 at 8:38 AM, paul swed paulsw...@gmail.com wrote: Hello to the group. Indeed the prom changes the behavior to a full controller and the ones I listed were changed and worked. Because those were the units I had found over the years. No idea about this particular prom and such. Regards Paul WB8TSL On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham jlt...@att.net wrote: Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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] IOTECH 488 EPROM
Joe, I have not tried it but I could. I guess I would download the file from Didier's site, program the EEPROM and give it a shot. It's a 64 KB EPROM going to a 256 KB EPROM. Doesn't sound right to me. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 11:04 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] IOTECH 488 EPROM The text file doesn't mention any particular model numbers, it just lists NI, along with others. I want to make sure that the NI GPIB-232CV-A will work with the other firmware. Has anyone done this specific model? Joe Gray W5JG On Sun, Mar 18, 2012 at 8:38 AM, paul swed paulsw...@gmail.com wrote: Hello to the group. Indeed the prom changes the behavior to a full controller and the ones I listed were changed and worked. Because those were the units I had found over the years. No idea about this particular prom and such. Regards Paul WB8TSL On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham jlt...@att.net wrote: Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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. ___ 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 BPSK Receiver Project? (fwd)
On Sun, 18 Mar 2012 13:25:54 + Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 4f65d971.8070...@arcor.de, ehydra writes: http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf In my implementation, it covered DC to 200MHz until I low-pass'ed it. His designs are always a good source but this one is AC-coupled ;-) Not in my implementation, I have eliminated the input capacitor because the active element is 3cm from the PCB, Could you explain how the distance of the antenna to the PCB is related to a DC block capacitor? And how do you block current flowing from the input stage of your amplifier into the antenna? and I drive the output with a centertapped transformer. Do you really mean a transformer? Or just a center tapped inductor? And how does that fit into the biasing? Or does your circuit contain more elements at the output than a transfomer/inductor and the biasing resistor? Attila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? ___ 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] IOTECH 488 EPROM
On Sun, 18 Mar 2012 09:12:09 -0500 J. L. Trantham jlt...@att.net wrote: I've never seen a PLCC UV erasable package. Do they exist? They did... long long ago.. I havent seen one in a long time. Ok, i haven't seen a EPROM with window in a nearly as long time either :-) Attila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? ___ 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] IOTECH 488 EPROM
I've never seen a PLCC UV erasable package. Do they exist? Yes. We used them many years ago. They are much more expensive than the write-once plastic packages. For the chips we were using, it was more than 2x. If you were reasonably sure you wouldn't need to reprogram them, plastic looked like a win. -- 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] IOTECH 488 EPROM
Joe Its been a while since I posted those eproms and info. I need to do 2 things. Look specifically at my models tested and listed and see what that means in the context of your question. Perhaps later today. Regards Paul. WB8TSL On Sun, Mar 18, 2012 at 11:38 AM, J. L. Trantham jlt...@att.net wrote: Paul, Have you tried this in an NI GPIB-232CV-A or a GPIB-232CT-A? I have tried to swap the data between a 232CT-A and a 232CV-A with no joy. The two units are fundamentally different. That's why I have the chips. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Sunday, March 18, 2012 9:38 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] IOTECH 488 EPROM Hello to the group. Indeed the prom changes the behavior to a full controller and the ones I listed were changed and worked. Because those were the units I had found over the years. No idea about this particular prom and such. Regards Paul WB8TSL On Sun, Mar 18, 2012 at 10:12 AM, J. L. Trantham jlt...@att.net wrote: Joe, The NI GPIB-232CV-A uses an ST M27C256B-15C1 One Time PROM in a PLCC 32 pin package. However, a Winbond W27E257 EEPROM is a pin for pin substitute. The M27C256B and the W27E257 both come in a 28 pin DIP package (0.6 spacing) so you should be able to use a programmer with that chip support and a DIP to PLCC adapter, wired appropriately, to do the programming. The 28 pin DIP packages are UV erasable. I've never seen a PLCC UV erasable package. Do they exist? In any event, I can program the chip for you if needed. I have some spare W27E257P-10 chips and can burn one for you as well and send it to you if needed. I am in Northwest Florida. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph Gray Sent: Sunday, March 18, 2012 2:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] IOTECH 488 EPROM The text file accompanying the EPROM file on KO4BB's site mentions using this EPROM image with a NI controller. I have a NI GPIB-232CV-A. Can I use the image with this controller? If so, I assume that I then have the equivalent of an IOTECH controller? I partially disassembled my GPIB-232CV-A and from peering between the boards, it looks like the EPROM is a PLCC. I can't burn one of those. If I can use this image with my controller, can someone burn a chip for me? I'll pay for the chip and shipping, of course. Joe Gray W5JG ___ 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. ___ 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 BPSK Receiver Project? (fwd)
The circuit in question doesn't appear to be in the PDF. You need to use a lot of caution with Lankford's theories. I don't want to get into a pissing contest, so I will leave it at that. Push pull with transformers goes back to the tube days. It is a convenient scheme to kill 2nd harmonic distortion while at the same time biasing the single sex amplifier. Take the center tap and tie it to a positive voltage. Feed the other two inputs to the transformer with a differential signal. You have blocked DC from the output, restoring a ground referenced single phase. (as opposed to differential) output. These active whips are prone to picking up electrical noise. Fine if you live in the boonies. Not so good for urban dwellers. If the antenna is just a wire in the air, I'm not sure what good it does to capacitively couple the input. Who cares if some DC is floating on a wire just poking in the air. While some people think of transformers are bandlimiting devices, note that all those coupling caps have series inductance. There is no free lunch. Just meditating out loud, if you were to go push pull with a ferrite antenna AND you are winding it yourself, you could avoid the biasing resistors by putting a center tap in the antenna itself, then tie that center tap to an appropriate bias voltage. I haven't seen this done, so their may be a gotcha with that scheme, but the science is good. Generally you will get a lower noise circuit if the input device is an amplifier rather than a buffer. Lanksford's input stage is essentially a push pull buffer, but I don't see that cancelling 2nd harmonics like a push pull amp. But for a whip, which is a single ended input, I don't see a way to get a differential input. Not true for a ferrite antenna. ___ 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 BPSK Receiver Project? (fwd)
My choice would be a center tapped, shielded, air core loop, running into a low noise instrumentation amp. Center tap of loop to twinax shield, grounded at preamp. The instrumentation amp has fixed gain, and very high CMRR and PSRR. It also does the differential to single ended conversion properly and has a low output impedance. I have used an instrumentation amp in my breadboard, however, without center tapping and shielding. But it seemed to me to be a very good component for such low frequencies. Marek ___ 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 BPSK Receiver Project? (fwd)
ehydra wrote: I wonder because ALL of the shown circuits in his pdf are AC-coupled. It is maybe possible to servo-loop with OpAmps but surely not worth the effort. Useful too as a Scope FET-probe. Not really the gain inaccuracy is somewhat excessive. One can do much better with the right circuit. The AC coupling between input and output stages isnt actually necessary if the output stage is biased appropriately. A higher supply voltage also helps. - Henry Bruce ___ 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 BPSK Receiver Project? (fwd)
In message 20120318182440.7cb729c2b018b0b2ca5f9...@kinali.ch, Attila Kinali w rites: On Sun, 18 Mar 2012 13:25:54 + Not in my implementation, I have eliminated the input capacitor because the active element is 3cm from the PCB, Could you explain how the distance of the antenna to the PCB is related to a DC block capacitor? And how do you block current flowing from the input stage of your amplifier into the antenna? The input to the amplifier is just a piece of metal, there is no need for a capacitor in series with it. The output from the amplifier goes to a transformer which drives a piece of twin-ax cable back to my lab. The reason for the transformer is that to go really deep in frequency the usual choke to separate the DC supply from RF signal doesn't work. I the 'cable-side' of the transformer, in both ends, is centertapped and that's how I provide power to the antenna. I have successfully received the Russian Omega-like system at 9-15 kHz and I have detected but not demodulated the 86Hz submarine transmission. That's DC enough for me :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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 BPSK Receiver Project?
I was not concerned about processing power on a PC (or Mac for that matter) but for the uC that was used in PHK's project. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Chris Albertson albertson.ch...@gmail.com Sender: time-nuts-boun...@febo.com Date: Thu, 15 Mar 2012 15:48:41 To: Discussion of precise time and frequency measurementtime-nuts@febo.com Reply-To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] WWVB BPSK Receiver Project? On Thu, Mar 15, 2012 at 3:13 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message 20120315152620.8347488e049854218aed4...@kinali.ch, Attila Kinali w rites: Do you need 16 bits or can you get by with a 12 bit ADC? In general: The more the merrier, for a digital dude like me, having more bits is easier than getting AGC working correctly :-) Have you considered using an FPGA for signal processing? It seems you need a fairly serious CPU to handle that much data. That much data we are talking about 192K samples per second. I can routinely record multiple tracks of 192K audio and do processing in real time and the CPU meter hardly moves the bottom.Even a gigabit per second Ethernet port is not a lot of data on a modern computer. FPGAs and DSP come into play if you are talking about tens of millions of samples per second with data rates above say 200Mb/Sec But the rate from an audio interface running 192K and 24-bits is still under one megabyte per second.An interesting ratio is the number of CPU cycles available to process one sample. On my Apple iMac that would be about roughly 200,000 operations per data sample. In real life SDR receivers even an older CPU can process the I and Q channels and maintain a large graphic screen and send and receive data over a network and still not be maxed out 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] WWVB BPSK Receiver Project? (fwd)
DC in a transformer raises the low frequency corner a bit. Obviously not a problem in your case. I should point out that every active device Lankford puts in the signal chain adds noise since the amp is really just a buffer, not an amplifier. You really want front end gain so that devices after the gain stage do not add as much to the noise floor. It is input referred noise that is significant, and Lankford's design is terrible in this respect. Oops, I almost started that pissing contest. ;-) On 3/18/2012 11:44 AM, Poul-Henning Kamp wrote: In message20120318182440.7cb729c2b018b0b2ca5f9...@kinali.ch, Attila Kinali w rites: On Sun, 18 Mar 2012 13:25:54 + Not in my implementation, I have eliminated the input capacitor because the active element is 3cm from the PCB, Could you explain how the distance of the antenna to the PCB is related to a DC block capacitor? And how do you block current flowing from the input stage of your amplifier into the antenna? The input to the amplifier is just a piece of metal, there is no need for a capacitor in series with it. The output from the amplifier goes to a transformer which drives a piece of twin-ax cable back to my lab. The reason for the transformer is that to go really deep in frequency the usual choke to separate the DC supply from RF signal doesn't work. I the 'cable-side' of the transformer, in both ends, is centertapped and that's how I provide power to the antenna. I have successfully received the Russian Omega-like system at 9-15 kHz and I have detected but not demodulated the 86Hz submarine transmission. That's DC enough for me :-) ___ 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.
