Re: [time-nuts] newbie question Thunderbolt supply
Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a 7805. Putting them in series gives me good thermal distribution. In my opinion every thing else is an overkill. Working with very low noise PLL's I have found that getting rid of switcher noise is much easier than 60 Hz. There are other pin compatible alternatives to the TC7662A, even a 555 will work, just more components. Bert Kehren In a message dated 8/25/2012 8:10:07 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi The easy way to do a TBolt supply is to start with something between 15 and 18 volts. Regulate down to 12 and 5 with linear regulators. 7805's are fine for the +5. Something like a LT1764 might be better for the +12. The -12 supply is very low current and does not matter much. People have had good luck with voltage inversion chips off the +15 and then something like a 79L12. Bob On Aug 25, 2012, at 6:41 PM, Edgardo Molina xe1...@amsat.org wrote: Dear Chris, Good afternoon. I am in the process of mounting my TBolt to a 2U 19 rack enclosure and was looking for a decent power supply. I found the Cisco unit and I am ordering a couple of them just in case. It would really be nice if I could have access to the diagram of the upgrade you did on yours to recreate the same performance from the Cisco unit. Please do not feel compromised if it is difficult to share. I didn't mean to be rude and if my note causes you any discomfort please kindly disregard it. I jumped into the thread because of experiencing the same doubts as the originator of it. Redondo Beach? I love visiting there whenever visiting my brother who lives in Rancho Palos Verdes. I would invite you lunch anytime just for the pleasure of meeting you in person. Thank you. Regards, Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Aug 25, 2012, at 3:26 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Sat, Aug 25, 2012 at 1:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? The true nuts here on the time nuts list will tell you that the noise from a switching power supply is bad and that you need a regulated linear power supply. But for most practical purposes the Cisco supply is a good one. Being only slightly nuts myself. I use the Cisco supply but I built a small power adaptor board with matching connectors and some pi filters made with RF choke and capacitors. I realy don't thing the filters are needed but I wanted a connectorized installation and a small choke was as easy to solder in as a length of wire. -- 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. ___ 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] newbie question Thunderbolt supply
Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator, the more stable it will be. The +12 is by far the most sensitive supply line on the TBolt. Bob On Aug 26, 2012, at 6:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a 7805. Putting them in series gives me good thermal distribution. In my opinion every thing else is an overkill. Working with very low noise PLL's I have found that getting rid of switcher noise is much easier than 60 Hz. There are other pin compatible alternatives to the TC7662A, even a 555 will work, just more components. Bert Kehren In a message dated 8/25/2012 8:10:07 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi The easy way to do a TBolt supply is to start with something between 15 and 18 volts. Regulate down to 12 and 5 with linear regulators. 7805's are fine for the +5. Something like a LT1764 might be better for the +12. The -12 supply is very low current and does not matter much. People have had good luck with voltage inversion chips off the +15 and then something like a 79L12. Bob On Aug 25, 2012, at 6:41 PM, Edgardo Molina xe1...@amsat.org wrote: Dear Chris, Good afternoon. I am in the process of mounting my TBolt to a 2U 19 rack enclosure and was looking for a decent power supply. I found the Cisco unit and I am ordering a couple of them just in case. It would really be nice if I could have access to the diagram of the upgrade you did on yours to recreate the same performance from the Cisco unit. Please do not feel compromised if it is difficult to share. I didn't mean to be rude and if my note causes you any discomfort please kindly disregard it. I jumped into the thread because of experiencing the same doubts as the originator of it. Redondo Beach? I love visiting there whenever visiting my brother who lives in Rancho Palos Verdes. I would invite you lunch anytime just for the pleasure of meeting you in person. Thank you. Regards, Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Aug 25, 2012, at 3:26 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Sat, Aug 25, 2012 at 1:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? The true nuts here on the time nuts list will tell you that the noise from a switching power supply is bad and that you need a regulated linear power supply. But for most practical purposes the Cisco supply is a good one. Being only slightly nuts myself. I use the Cisco supply but I built a small power adaptor board with matching connectors and some pi filters made with RF choke and capacitors. I realy don't thing the filters are needed but I wanted a connectorized installation and a small choke was as easy to solder in as a length of wire. -- 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
Re: [time-nuts] newbie question Thunderbolt supply
On 08/26/2012 02:07 PM, Bob Camp wrote: Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator, the more stable it will be. The +12 is by far the most sensitive supply line on the TBolt. Switcher to give a fairly stable voltage, filtered for noise and then linear stepdown for the last step. It's been done in high power audio amplifiers the last 20 years or so. 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] newbie question Thunderbolt supply
Having played with most combinations I could think of including the 1764 there is a lot to be said about the stability of the 7812 and mounting every thing on one plate since power dissipation of the OCXO decreases with increase in ambient temperature and current fluctuation is minimal since input from the switcher is very stable and 78 tabs are bolted to the aluminum plate. I am staying with 5 V regulator fed by 7812. Using battery backup changes every thing and I use a switcher for the 5V followed by a LDO and a separate switcher for the 12 V again followed by a LDO. Bert Kehren In a message dated 8/26/2012 8:09:03 A.M. Eastern Daylight Time, li...@rtty.us writes: Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator, the more stable it will be. The +12 is by far the most sensitive supply line on the TBolt. Bob On Aug 26, 2012, at 6:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a 7805. Putting them in series gives me good thermal distribution. In my opinion every thing else is an overkill. Working with very low noise PLL's I have found that getting rid of switcher noise is much easier than 60 Hz. There are other pin compatible alternatives to the TC7662A, even a 555 will work, just more components. Bert Kehren In a message dated 8/25/2012 8:10:07 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi The easy way to do a TBolt supply is to start with something between 15 and 18 volts. Regulate down to 12 and 5 with linear regulators. 7805's are fine for the +5. Something like a LT1764 might be better for the +12. The -12 supply is very low current and does not matter much. People have had good luck with voltage inversion chips off the +15 and then something like a 79L12. Bob On Aug 25, 2012, at 6:41 PM, Edgardo Molina xe1...@amsat.org wrote: Dear Chris, Good afternoon. I am in the process of mounting my TBolt to a 2U 19 rack enclosure and was looking for a decent power supply. I found the Cisco unit and I am ordering a couple of them just in case. It would really be nice if I could have access to the diagram of the upgrade you did on yours to recreate the same performance from the Cisco unit. Please do not feel compromised if it is difficult to share. I didn't mean to be rude and if my note causes you any discomfort please kindly disregard it. I jumped into the thread because of experiencing the same doubts as the originator of it. Redondo Beach? I love visiting there whenever visiting my brother who lives in Rancho Palos Verdes. I would invite you lunch anytime just for the pleasure of meeting you in person. Thank you. Regards, Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Aug 25, 2012, at 3:26 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Sat, Aug 25, 2012 at 1:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? The true nuts here on the time nuts list will tell you that the noise from a switching power supply is bad and that you need a regulated linear power supply. But for most practical purposes the Cisco supply is a good one. Being only slightly nuts myself. I use the
Re: [time-nuts] newbie question Thunderbolt supply
On Sun, Aug 26, 2012 at 3:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a 7805. Putting them in series gives me good thermal distribution. One of the advantages of generating waste heat like that is that you can but the heat to good use. I build a temperature controlled fan. It is very simple a temperature sensor IC connects to an opamp that drives a power transistor that drives a 12V fan. As for the power supply. I used a filter that does not drop any volts and I can't see any RF on the DC using my old 365 Tek scope or by using a more sensitive RF power meter. 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.
Re: [time-nuts] newbie question Thunderbolt supply
Hi all: I'm using buck regulators from our ebay friends, e.g. 130704328176 at a little over $1.00 apiece, settable to 5 v or 12 v or whatever, capable of 3 A with good heatsink. Foldback protection. Better than a 3-legged fuse, as my good gaffer Argus calls 'em. Don Bob Camp Hi The only real disadvantage of a 7812 / 340-12 is it's relatively high drop out voltage compared to a 1764 (or similar). Stability of any of them will be impacted more by thermal issues than anything else. The colder you can keep the 12V regulator, the more stable it will be. The +12 is by far the most sensitive supply line on the TBolt. Bob On Aug 26, 2012, at 6:46 AM, ewkeh...@aol.com wrote: Having played with several solutions I found the best is a 12 V 1 A switcher with the output voltage increased to 15 V, check the capacitors and if necessary replace with 25 V. I laid out a PC board that has a TC7662A inverter followed by a 79L12. Also on the board is a 7812 followed by a 7805. Putting them in series gives me good thermal distribution. In my opinion every thing else is an overkill. Working with very low noise PLL's I have found that getting rid of switcher noise is much easier than 60 Hz. There are other pin compatible alternatives to the TC7662A, even a 555 will work, just more components. Bert Kehren In a message dated 8/25/2012 8:10:07 P.M. Eastern Daylight Time, li...@rtty.us writes: Hi The easy way to do a TBolt supply is to start with something between 15 and 18 volts. Regulate down to 12 and 5 with linear regulators. 7805's are fine for the +5. Something like a LT1764 might be better for the +12. The -12 supply is very low current and does not matter much. People have had good luck with voltage inversion chips off the +15 and then something like a 79L12. Bob On Aug 25, 2012, at 6:41 PM, Edgardo Molina xe1...@amsat.org wrote: Dear Chris, Good afternoon. I am in the process of mounting my TBolt to a 2U 19 rack enclosure and was looking for a decent power supply. I found the Cisco unit and I am ordering a couple of them just in case. It would really be nice if I could have access to the diagram of the upgrade you did on yours to recreate the same performance from the Cisco unit. Please do not feel compromised if it is difficult to share. I didn't mean to be rude and if my note causes you any discomfort please kindly disregard it. I jumped into the thread because of experiencing the same doubts as the originator of it. Redondo Beach? I love visiting there whenever visiting my brother who lives in Rancho Palos Verdes. I would invite you lunch anytime just for the pleasure of meeting you in person. Thank you. Regards, Edgardo Molina Dirección IPTEL www.iptel.net.mx T : 55 55 55202444 M : 04455 20501854 Piensa en Bits SA de CV Información anexa: CONFIDENCIALIDAD DE INFORMACION Este mensaje tiene carácter confidencial. Si usted no es el destinarario de este mensaje, le suplicamos se lo notifique al remitente mediante un correo electrónico y que borre el presente mensaje y sus anexos de su computadora sin retener una copia de los mismos. Queda estrictamente prohibido copiar este mensaje o hacer usode el para cualquier propósito o divulgar su en forma parcial o total su contenido. Gracias. NON-DISCLOSURE OF INFORMATION This email is strictly confidential and may also be privileged. If you are not the intended recipient please immediately advise the sender by replying to this e-mail and then deleting the message and its attachments from your computer without keeping a copy. It is strictly forbidden to copy it or use it for any purpose or disclose its contents to any third party. Thank you. On Aug 25, 2012, at 3:26 PM, Chris Albertson albertson.ch...@gmail.com wrote: On Sat, Aug 25, 2012 at 1:06 PM, Jerry jster...@att.net wrote: I am using a Cisco supply 3 voltage supply for the T-bolt. Is there any performance loss if the +12vdc rail and the -12vdc rail are off by a few % in opposite directions, e,g +11.7 vdc and -12.3vdc ? The true nuts here on the time nuts list will tell you that the noise from a switching power supply is bad and that you need a regulated linear power supply. But for most practical purposes the Cisco supply is a good one. Being only slightly nuts myself. I use the Cisco supply but I built a small power adaptor board with matching connectors and some pi filters made with RF choke and capacitors. I realy don't thing the filters are needed but I wanted a connectorized installation and a small choke was as easy to solder in as a length of wire. -- 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.
Re: [time-nuts] ET-6000 firmware
KO4BB is busy cutting plywood and boarding windows, will be back to fun stuff after Isaac... Didier KO4BB Robert Watzlavick roc...@watzlavick.com wrote: I finally got a flash programmer so I uploaded all three ROM images (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB website. Last year I sent them 3 chips and asked for all the variants so I could play with converting my TCXO unit to an OCXO unit (and potentially a Rubidium some day). I think the images are in the upload folder awaiting their final home. This latest firmware addresses the GPS date problem. DT101E = TCXO DT102E = OCXO DT103E = Rubidium Some guy is selling DT101E chips on eBay for $50 (sorry if you're on the list...) -Bob ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] ET-6000 firmware
Good luck!! -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Didier Juges Sent: 26 August 2012 19:09 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] ET-6000 firmware KO4BB is busy cutting plywood and boarding windows, will be back to fun stuff after Isaac... Didier KO4BB Robert Watzlavick roc...@watzlavick.com wrote: I finally got a flash programmer so I uploaded all three ROM images (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB website. Last year I sent them 3 chips and asked for all the variants so I could play with converting my TCXO unit to an OCXO unit (and potentially a Rubidium some day). I think the images are in the upload folder awaiting their final home. This latest firmware addresses the GPS date problem. DT101E = TCXO DT102E = OCXO DT103E = Rubidium Some guy is selling DT101E chips on eBay for $50 (sorry if you're on the list...) -Bob ___ 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. -- Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things. ___ 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] re ET-6000 firmware
Bob; I have a TCXO version and wonder apart from the ROM change, what recommended hardware is required to install a rubidium osc? Is there a parts list somewhere? I would prefer not to cobble up if I can help it. I finally got a flash programmer so I uploaded all three ROM images (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB website. Last year I sent them 3 chips and asked for all the variants so I could play with converting my TCXO unit to an OCXO unit (and potentially a Rubidium some day). I think the images are in the upload folder awaiting their final home. This latest firmware addresses the GPS date problem. DT101E = TCXO DT102E = OCXO DT103E = Rubidium Some guy is selling DT101E chips on eBay for $50 (sorry if you're on the list...) -Bob -- Joe Leikhim President Leikhim and Associates Oviedo Florida 407-982-0446 jleik...@leikhim.com www.leikhim.com ___ 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] PM6685 GPIB PROM image ?
Hello, I have a GPIB option card (PM9626) from a PM6680 and I would like to use it in a PM6685. Looking at the service manuals, the only difference between the two GPIB cards for the two counters is the FW PROM, so I'm looking for a PM6685 GPIB PROM image or anybody with a PM6685 that could help with this. Thanks!, Claudio ___ 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] PM6685 GPIB PROM image ?
First try if it works as it is. On Sun, Aug 26, 2012 at 11:24 PM, Claudio Girardi claudio.gira...@virgilio.it wrote: Hello, I have a GPIB option card (PM9626) from a PM6680 and I would like to use it in a PM6685. Looking at the service manuals, the only difference between the two GPIB cards for the two counters is the FW PROM, so I'm looking for a PM6685 GPIB PROM image or anybody with a PM6685 that could help with this. Thanks!, Claudio ___ 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] re ET-6000 firmware
The manual I have isn't too clear on the differences between the units but the drawing shows an LPRO tucked into the left front of the unit with 2 coax cables going to the PC board (EFC, OSC), and one going to an additional power supply in the right rear. The ET-6000 DAC is 0-5V (actually 0.5-4.5 I think) so the LPRO will probably work without any adjustments other than the new firmware which contains the appropriate gain and filter constants. I believe all you need to do is: Remove the TCXO (or cut the trace from the output) Connect the 10 MHz from the LPRO to J3 (OSC in) Install a suitable resistor at position R96 (it shows 51 1 - 51 ohm, 1 watt?) Connect J2 (DAC out) to the LPRO Install an appropriate power supply for the LPRO Somebody mentioned a while back that the units with the LPRO in them ran very hot. -Bob On 08/26/2012 02:05 PM, Joe Leikhim wrote: Bob; I have a TCXO version and wonder apart from the ROM change, what recommended hardware is required to install a rubidium osc? Is there a parts list somewhere? I would prefer not to cobble up if I can help it. I finally got a flash programmer so I uploaded all three ROM images (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB website. Last year I sent them 3 chips and asked for all the variants so I could play with converting my TCXO unit to an OCXO unit (and potentially a Rubidium some day). I think the images are in the upload folder awaiting their final home. This latest firmware addresses the GPS date problem. DT101E = TCXO DT102E = OCXO DT103E = Rubidium Some guy is selling DT101E chips on eBay for $50 (sorry if you're on the list...) -Bob ___ 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] re ET-6000 firmware
Hi; I may have a LPRO unit, if so I will post pictures. Best Wishes; Thomas Knox Date: Sun, 26 Aug 2012 21:08:03 -0500 From: roc...@watzlavick.com To: jleik...@leikhim.com; time-nuts@febo.com Subject: Re: [time-nuts] re ET-6000 firmware The manual I have isn't too clear on the differences between the units but the drawing shows an LPRO tucked into the left front of the unit with 2 coax cables going to the PC board (EFC, OSC), and one going to an additional power supply in the right rear. The ET-6000 DAC is 0-5V (actually 0.5-4.5 I think) so the LPRO will probably work without any adjustments other than the new firmware which contains the appropriate gain and filter constants. I believe all you need to do is: Remove the TCXO (or cut the trace from the output) Connect the 10 MHz from the LPRO to J3 (OSC in) Install a suitable resistor at position R96 (it shows 51 1 - 51 ohm, 1 watt?) Connect J2 (DAC out) to the LPRO Install an appropriate power supply for the LPRO Somebody mentioned a while back that the units with the LPRO in them ran very hot. -Bob On 08/26/2012 02:05 PM, Joe Leikhim wrote: Bob; I have a TCXO version and wonder apart from the ROM change, what recommended hardware is required to install a rubidium osc? Is there a parts list somewhere? I would prefer not to cobble up if I can help it. I finally got a flash programmer so I uploaded all three ROM images (TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB website. Last year I sent them 3 chips and asked for all the variants so I could play with converting my TCXO unit to an OCXO unit (and potentially a Rubidium some day). I think the images are in the upload folder awaiting their final home. This latest firmware addresses the GPS date problem. DT101E = TCXO DT102E = OCXO DT103E = Rubidium Some guy is selling DT101E chips on eBay for $50 (sorry if you're on the list...) -Bob ___ 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] Need usb time interval time for portable bullet chrongraph
Hello Folks I have been looking at bullet chrographs and wondering if I could get the a usb module to do a interval measurement and display on my laptop. on a yet to be discovered module to calculate the time interval between the pulses? The bullet travels at approx 1050 feet per second. By spacing my gates providing the start stop pulses precisely 1 foot apart I think a direct read out except for the decibal point being in the wrong place . Does this seem fesable? Here is one module I found http://www.weedtech.com/index_eventcount.html Any thoughts on this? The reason for the USB would be for display on my laptop at the firing range Thank you for any help I would really appreciate it PaulC W1VLF ___ 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] Need usb time interval time for portable bullet chrongraph
Hi Paul, See http://leapsecond.com/pic/picpet.htm and contact me offline for the USB part. What do you use for sensors: acoustic, optical, seismic? /tvb (iPhone4) On Aug 26, 2012, at 10:48 PM, Paul Cianciolo pa...@snet.net wrote: Hello Folks I have been looking at bullet chrographs and wondering if I could get the a usb module to do a interval measurement and display on my laptop. on a yet to be discovered module to calculate the time interval between the pulses? The bullet travels at approx 1050 feet per second. By spacing my gates providing the start stop pulses precisely 1 foot apart I think a direct read out except for the decibal point being in the wrong place . Does this seem fesable? Here is one module I found http://www.weedtech.com/index_eventcount.html Any thoughts on this? The reason for the USB would be for display on my laptop at the firing range Thank you for any help I would really appreciate it PaulC W1VLF ___ 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] Bullet Chronograph
Hi, Paul-- I have several different ballistic chronographs-- only one of the ones I have interfaces to a laptop (Oehler Ballistic Laboratory model). There are inexpensive chronographs available for a little over $100. Some models do provide interface to a laptop as well as a LOT of built-in functions such as this one: http://www.midwayusa.com/product/773378/ced-millennium-2-chronograph-system CED Millennium 2 Chronograph System Over 1000 shot capacity with up to 500 string permanent memory Records velocities from 50 fps to 7,000 fps High, Low, Average, Hi-Average velocity readings Extreme Spread Standard Deviation Edit Omit functions Built-in Calculator IPSC / IDPA Power Factor computation Function New Data Collector Software program included Meter or feet recording 10X Mode - records slower velocities in decimeters Voice Chip technology - Results can be heard as well as seen On / Off control, with no-memory loss Auto-Shut Down mode PC Downloads - USB interface for fast, software downloads of stored data Data Collector Software program included Low battery warning indicator Back-up battery storage Operating Temperature range (0°C to 50°C) -- Mike Baker ___ 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] Need usb time interval time for portable bullet chrongraph
Hi Paul: I'm presently adapting a chrony chronograph because I want to use the triggers for timing and other purposes. They've spent a LOT of engineering time to get proper triggering, and the triggers can easily be pulled off without disturbing the basic unit. The triggers are robust and will drive a piece of coax with a nice pulse at a 5 v level. The cheapest chrony is under $100 and using their triggers will save you HOURS and HOURS of fiddling around, trust me! You can use something like an arduino which has two interrupt inputs to do the time measurement, or as Tom suggests. Don Paul Cianciolo Hello Folks I have been looking at bullet chrographs and wondering if I could get the a usb module to do a interval measurement and display on my laptop. on a yet to be discovered module to calculate the time interval between the pulses? The bullet travels at approx 1050 feet per second. By spacing my gates providing the start stop pulses precisely 1 foot apart I think a direct read out except for the decibal point being in the wrong place . Does this seem fesable? Here is one module I found http://www.weedtech.com/index_eventcount.html Any thoughts on this? The reason for the USB would be for display on my laptop at the firing range Thank you for any help I would really appreciate it PaulC W1VLF ___ 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. -- Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind. R. Bacon If you don't know what it is, don't poke it. Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ 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.
