[time-nuts] Slow death of Waas 48
Hi guys, Waas sat 48 (prn 135) is still going strong, much longer than originally forecasted - it is experiencing a complete avionics failure as you may know. Has anyone set up tests to see how it's eventual demise may affect timing accuracy? One of our FireFly-1A boards can be monitored in realtime here and we can see that waas 48 is still going strong: http://www.jackson-labs.com/images/gpsstat.htm All of our FireFly units are waas enabled by default. the operators are desperately trying to kill the sat to avoid interference with other sats as it aimlessly drifts about into the field of view of other geos', so at some point we may see it cut off suddenly. We will monitor the events here. If the waas firmware in our gps receivers works properly I wouldn't expect any impact. But who knows, software bugs could seriously affect especially airplanes landing in instrument conditions relying on proper waas operations.. Btw: I am surprised that we haven't even seen a drop in C/No on the sat yet.. Bye Said ___ 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] Slow death of Waas 48
On 07/07/2010 08:11 AM, Said Jackson wrote: Hi guys, Waas sat 48 (prn 135) is still going strong, much longer than originally forecasted - it is experiencing a complete avionics failure as you may know. Has anyone set up tests to see how it's eventual demise may affect timing accuracy? One of our FireFly-1A boards can be monitored in realtime here and we can see that waas 48 is still going strong: http://www.jackson-labs.com/images/gpsstat.htm All of our FireFly units are waas enabled by default. the operators are desperately trying to kill the sat to avoid interference with other sats as it aimlessly drifts about into the field of view of other geos', so at some point we may see it cut off suddenly. We will monitor the events here. If the waas firmware in our gps receivers works properly I wouldn't expect any impact. But who knows, software bugs could seriously affect especially airplanes landing in instrument conditions relying on proper waas operations.. Btw: I am surprised that we haven't even seen a drop in C/No on the sat yet.. If it still has power, oriented in the right direction (antennas down) and they keep beaming signals to it, it will work. If they don't beam signals into it, it would still sit there and broadcast, so they might as well use it. The best thing for them would be a loss of orientation control if not a complete power failure would save them. If it spins, it will get less power and less amount of time it would be facing the earth with it's noise transmissions. 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] 5061A Problem Child - It Lives!
Congratulations Joe!!! Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Tuesday, July 06, 2010 11:44 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] 5061A Problem Child - It Lives! Just a wrap up on the 5061A that had a Beam I but no 2nd Harmonic indication. I was originally stymied by swaps of modules with another 'functioning unit' with no help. I then swapped CS tubes with A4 Harmonic Generators attached and A11 Cesium controllers at which point neither unit worked. I added an A15 Power regulator swap and still neither unit worked. I undid the swaps, got the 'functioning unit' working again (found a leaky A11C2, a 2.2 uF film capacitor with a resistance of about 1800 ohms, that prevented the 2.8 KHz Control Oscillator from oscillating), then went through some tests of both units, assembly by assembly and found A7 faulty. Problem was a 'weak' Q1 (1854-0023, the input transistor in a 3 transistor amplifier)) with a Beta of about 20. An identical transistor at Q2 had a Beta of about 200. I installed a 2NA that had a Beta of about 150 and all was well. The 2nd Harmonic came up normally but the Alarm light would not go out. However, when put in Operate, the Continuous Operation light would come on and the unit seemed to 'lock' normally. I found an open Q20 and a shorted Q22 (both 1854-0003's) on the A14 Logic Assembly causing the Alarm light to stay on. Replaced these with 2NA's and now all seems well. I can't explain why swapping A7 modules early on did not resolve the 2nd Harmonic indication problem unless both A7's were 'weak' allowing them to work with a stronger signal but not a weak signal or all the swapping of tubes, back and forth, in and out, etc., fixed a dirty connection. On reflection, probably the latter. In any event, it works and seems to be one of my stronger tubes. I could not find any cross reference for either of these NPN transistors but the 2NA seemed to do just fine. Thanks for everyone's help. Joe ___ 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] Pic programing for the PICTIC II
Hi The closest thing I could find were the side adjust parts. They also have flat on the board parts and 3/8 squares. No sign of top adjust 1/4 parts Bob On Jul 7, 2010, at 1:09 AM, Ed Palmer wrote: It looks like there's still a problem with the trimmers. R17 and R22 are shown as part # 3266P-1-502LF and the photo shows the proper type of trimmer. The data sheet and the catalog page show that 3266P has the adjustment parallel to the board rather than vertical. Mouser just used the same picture for all styles of the 3266 line. There are others that are in stock, but they're larger and I don't know if there's room for them on the board. Ed Bob Bownes wrote: Changed it to a different part that is available. Difference is RHoS compliance method. Changed the backordered 2n3906 as well. Shaved $0.02 off the total cost! Bob On Fri, Jul 2, 2010 at 3:17 PM, Bob Camp li...@rtty.us wrote: Hi It looks like it may be a while before the trim pots come in (12 weeks...). The 3266X (side adjust rather than top adjust) is in stock. I'm not sure if the layout is side adjust friendly or not. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Bownes Sent: Friday, July 02, 2010 2:54 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Pic programing for the PICTIC II Folks, I put together a mouser 'project' with all of the parts. This means you can just go to the mouser site and order all the parts for the project. No need for anyone to do a group buy of parts, re-pack and re-distribute them. Here's how to get to it: To access the project, click on the url listed below or copy and paste it into your web browser: http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7ada9ced0 Or you can access the project by going to http://www.mouser.com/ and click on the EZ Buy option on the top navigation bar. You can also click on this link or copy and paste it into your browser: http://www.mouser.com/Tools/Tools.aspx. Then enter the following access number listed below into the Project Access ID function. c7ada9ced0 Total cost w/o shipping is $30.30. On Fri, Jul 2, 2010 at 1:23 PM, Peter Vince pvi...@theiet.org wrote: Apologies for the previous incomplete message - somehow my laptop trackpad jumped the cursor over the send button :-( Better ? How many16f688s are we talking here? My thinking is less than 10 as only two people have asked. Don't know how many have not asked. I would also like a pre-programmed PIC please, if someone can arrange that. Or ideally, a complete kit of parts, but as the previous correspondent has written, I appreciate that is a lot of work. Thanks, Peter Vince (London, England) ___ 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. ___ 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] Parts (Mouser) for the PICTIC II
Has the Mouser list: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7ada9ced0 Been updated with the right trimmers, or is right still up in the air? Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. ___ 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] Parts (Mouser) for the PICTIC II
It has not been updated yet. We're still looking for a good replacement. On Wed, Jul 7, 2010 at 10:57 AM, Lester Veenstra les...@veenstras.com wrote: Has the Mouser list: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7ada9ced0 Been updated with the right trimmers, or is right still up in the air? Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. ___ 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] Parts (Mouser) for the PICTIC II
Not right this sec. Give us a few hours. On Wed, Jul 7, 2010 at 11:08 AM, Lester Veenstra les...@veenstras.com wrote: So now would not be a good time to execute a Mouser Project buy. Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -Original Message- From: Bob Bownes [mailto:bow...@gmail.com] Sent: Wednesday, July 07, 2010 4:05 PM To: les...@veenstras.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Parts (Mouser) for the PICTIC II It has not been updated yet. We're still looking for a good replacement. On Wed, Jul 7, 2010 at 10:57 AM, Lester Veenstra les...@veenstras.com wrote: Has the Mouser list: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7ad a9ced0 Been updated with the right trimmers, or is right still up in the air? Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. ___ 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] Parts (Mouser) for the PICTIC II
Q4, the FET seems to missing from the Mouser BOM. Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -Original Message- From: Bob Bownes [mailto:bow...@gmail.com] Sent: Wednesday, July 07, 2010 4:14 PM To: les...@veenstras.com Cc: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Parts (Mouser) for the PICTIC II Not right this sec. Give us a few hours. On Wed, Jul 7, 2010 at 11:08 AM, Lester Veenstra les...@veenstras.com wrote: So now would not be a good time to execute a Mouser Project buy. Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. -Original Message- From: Bob Bownes [mailto:bow...@gmail.com] Sent: Wednesday, July 07, 2010 4:05 PM To: les...@veenstras.com; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Parts (Mouser) for the PICTIC II It has not been updated yet. We're still looking for a good replacement. On Wed, Jul 7, 2010 at 10:57 AM, Lester Veenstra les...@veenstras.com wrote: Has the Mouser list: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=c7a d a9ced0 Been updated with the right trimmers, or is right still up in the air? Lester B Veenstra MØYCM K1YCM les...@veenstras.com m0...@veenstras.com k1...@veenstras.com US Postal Address: PSC 45 Box 781 APO AE 09468 USA UK Postal Address: Dawn Cottage Norwood, Harrogate HG3 1SD, UK Telephones: Office: +44-(0)1423-846-385 Home: +44-(0)1943-880-963 Guam Cell: +1-671-788-5654 UK Cell: +44-(0)7716-298-224 US Cell: +1-240-425-7335 Jamaica: +1-876-352-7504 This e-mail and any documents attached hereto contain confidential or privileged information. The information is intended to be for use only by the individual or entity to whom they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this e-mail or any documents attached hereto is prohibited. ___ 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] PICTIC II Programmed 16f688 chips
Hi Bob; When I can buy one of those programmers that runs on the MAC OS, please let me know. I would much prefer to offer a fellow enthusiast $20 to provide a programmed chip then get involved with Windows (even if it would open the opportunity for Lady Heather...humm). I get too much exposure to it at work to be willing to bring such suffering home. Sadly, I cannot use my work machines for anything along these lines or this would be easy. I do have a DOS machine...an LX200. Tom Frank, KA2CDK On Jul 5, 2010, at 9:35 AM, Bob Camp wrote: Hi One thing to consider: If you Google PIC Programmer there are a number of hits for sub $20 gizmos that are everything you would ever need as the hardware is concerned. The programming software is a free download off the Microchip site. It runs on any and all Windows operating systems. Programing parts is pretty simple and essentially foolproof. PIC's are pretty common, so you probably will use the programmer again. On a similar note - I would put the PIC on the board in a socket. If there are future software enhancements, the chip will need to be pulled to be re-programmed. Bob On Jul 4, 2010, at 11:36 PM, Thomas A. Frank wrote: I'd like to make the same request. Thanks! Tom Frank, KA2CDK On Jul 4, 2010, at 7:55 PM, James Robbins wrote: Is there anyone here in the US who can offer the 16f688 chips for sale and/or provide programming for the chips? All associated costs would be paid, of course. Many thanks. Jim Robbins N1JR jsrobb...@earthlink.net ___ 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] PICTIC II Programmed 16f688 chips
Google pic programming mac os turns up many links. http://www.mactech.com/articles/mactech/Vol.20/20.02/PICMicrocontroller/index.html http://www.1710.co.uk/cms/pics-on-mac Stanley - Original Message From: Thomas A. Frank ka2...@cox.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wed, July 7, 2010 10:56:29 AM Subject: Re: [time-nuts] PICTIC II Programmed 16f688 chips Hi Bob; When I can buy one of those programmers that runs on the MAC OS, please let me know. I would much prefer to offer a fellow enthusiast $20 to provide a programmed chip then get involved with Windows (even if it would open the opportunity for Lady Heather...humm). I get too much exposure to it at work to be willing to bring such suffering home. Sadly, I cannot use my work machines for anything along these lines or this would be easy. I do have a DOS machine...an LX200. Tom Frank, KA2CDK On Jul 5, 2010, at 9:35 AM, Bob Camp wrote: Hi One thing to consider: If you Google PIC Programmer there are a number of hits for sub $20 gizmos that are everything you would ever need as the hardware is concerned. The programming software is a free download off the Microchip site. It runs on any and all Windows operating systems. Programing parts is pretty simple and essentially foolproof. PIC's are pretty common, so you probably will use the programmer again. On a similar note - I would put the PIC on the board in a socket. If there are future software enhancements, the chip will need to be pulled to be re-programmed. Bob On Jul 4, 2010, at 11:36 PM, Thomas A. Frank wrote: I'd like to make the same request. Thanks! Tom Frank, KA2CDK On Jul 4, 2010, at 7:55 PM, James Robbins wrote: Is there anyone here in the US who can offer the 16f688 chips for sale and/or provide programming for the chips? All associated costs would be paid, of course. Many thanks. Jim Robbins N1JR jsrobb...@earthlink.net ___ 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] PICTIC II Programmed 16f688 chips
Things like MicroChip's PICStart run nicely on Linux under wine. And if you don't want to run wine, there is an open source program called PICLAB which runs directly on linux, BSD, etc... I would bet it would run under a MAC too. -Chuck Harris Stanley Reynolds wrote: Google pic programming mac os turns up many links. http://www.mactech.com/articles/mactech/Vol.20/20.02/PICMicrocontroller/index.html http://www.1710.co.uk/cms/pics-on-mac Stanley - Original Message From: Thomas A. Frankka2...@cox.net To: Discussion of precise time and frequency measurementtime-nuts@febo.com Sent: Wed, July 7, 2010 10:56:29 AM Subject: Re: [time-nuts] PICTIC II Programmed 16f688 chips Hi Bob; When I can buy one of those programmers that runs on the MAC OS, please let me know. I would much prefer to offer a fellow enthusiast $20 to provide a programmed chip then get involved with Windows (even if it would open the opportunity for Lady Heather...humm). I get too much exposure to it at work to be willing to bring such suffering home. Sadly, I cannot use my work machines for anything along these lines or this would be easy. I do have a DOS machine...an LX200. Tom Frank, KA2CDK ___ 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] Slow death of Waas 48
Hi Magnus, Just read up on their website, they cannot disable the WAAS signal because it would disable all GPS WAAS landing approaches in the USA. A very big deal. When it fails, they will be landing aircraft with only one GPS bird for a while, and no backup! So it will continue to transmit, until it looses earth-lock, which they expect to happen in the next couple of weeks due to the Sat's momentum wheels saturating.. Exciting stuff! BTW: seems like no one is monitoring this on their GPSDO's? bye, Said In a message dated 7/7/2010 01:05:07 Pacific Daylight Time, mag...@rubidium.dyndns.org writes: If it still has power, oriented in the right direction (antennas down) and they keep beaming signals to it, it will work. If they don't beam signals into it, it would still sit there and broadcast, so they might as well use it. The best thing for them would be a loss of orientation control if not a complete power failure would save them. If it spins, it will get less power and less amount of time it would be facing the earth with it's noise transmissions. 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] PICTIC II Programmed 16f688 chips
I would be very happy to provide PIC chips and programming service to anybody in the continental USA. How about we do this for $10.00 shipped for the first chip, and $2.50 per chip after that. Email me privately (rdarling...@gmail.com) if you're interested. I'll stop taking names next Tuesday (13th) and place an order for the chips and get them shipped out within a week of receiving them. I'm happy to take paypal or personal check, or even cash. -Bob, N3XKB On Wed, Jul 7, 2010 at 9:56 AM, Thomas A. Frank ka2...@cox.net wrote: Hi Bob; When I can buy one of those programmers that runs on the MAC OS, please let me know. I would much prefer to offer a fellow enthusiast $20 to provide a programmed chip then get involved with Windows (even if it would open the opportunity for Lady Heather...humm). I get too much exposure to it at work to be willing to bring such suffering home. Sadly, I cannot use my work machines for anything along these lines or this would be easy. I do have a DOS machine...an LX200. Tom Frank, KA2CDK On Jul 5, 2010, at 9:35 AM, Bob Camp wrote: Hi One thing to consider: If you Google PIC Programmer there are a number of hits for sub $20 gizmos that are everything you would ever need as the hardware is concerned. The programming software is a free download off the Microchip site. It runs on any and all Windows operating systems. Programing parts is pretty simple and essentially foolproof. PIC's are pretty common, so you probably will use the programmer again. On a similar note - I would put the PIC on the board in a socket. If there are future software enhancements, the chip will need to be pulled to be re-programmed. Bob On Jul 4, 2010, at 11:36 PM, Thomas A. Frank wrote: I'd like to make the same request. Thanks! Tom Frank, KA2CDK On Jul 4, 2010, at 7:55 PM, James Robbins wrote: Is there anyone here in the US who can offer the 16f688 chips for sale and/or provide programming for the chips? All associated costs would be paid, of course. Many thanks. Jim Robbins N1JR jsrobb...@earthlink.net ___ 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] PICTIC II Programmed 16f688 chips
Hi The hardware for just about any of them will run fine under OS-X. The software is not available as OS-X native program. The simple answers would be to run it under Boot Camp or in a Vmware shell. Neither one is really a Mac solution to the problem though, since you are running Windows on the Mac. None of it would work if you have a Power PC Mac. Simply put - like a lot of technical stuff, you need Windows or a Windows clone. Bob On Jul 7, 2010, at 11:56 AM, Thomas A. Frank wrote: Hi Bob; When I can buy one of those programmers that runs on the MAC OS, please let me know. I would much prefer to offer a fellow enthusiast $20 to provide a programmed chip then get involved with Windows (even if it would open the opportunity for Lady Heather...humm). I get too much exposure to it at work to be willing to bring such suffering home. Sadly, I cannot use my work machines for anything along these lines or this would be easy. I do have a DOS machine...an LX200. Tom Frank, KA2CDK On Jul 5, 2010, at 9:35 AM, Bob Camp wrote: Hi One thing to consider: If you Google PIC Programmer there are a number of hits for sub $20 gizmos that are everything you would ever need as the hardware is concerned. The programming software is a free download off the Microchip site. It runs on any and all Windows operating systems. Programing parts is pretty simple and essentially foolproof. PIC's are pretty common, so you probably will use the programmer again. On a similar note - I would put the PIC on the board in a socket. If there are future software enhancements, the chip will need to be pulled to be re-programmed. Bob On Jul 4, 2010, at 11:36 PM, Thomas A. Frank wrote: I'd like to make the same request. Thanks! Tom Frank, KA2CDK On Jul 4, 2010, at 7:55 PM, James Robbins wrote: Is there anyone here in the US who can offer the 16f688 chips for sale and/or provide programming for the chips? All associated costs would be paid, of course. Many thanks. Jim Robbins N1JR jsrobb...@earthlink.net ___ 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] GPS Common View
Hi I just got through poking at a couple of TBolts with Lady Heather. It appears that you can indeed get the hardware and software to put the TBolt into single satellite mode. That may enable a pretty simple GPS common view setup. One way to do it: Somebody picks a set of sats and times that make sense. Since the constellation repeats it's going to be a fairly simple table of this sat / that time. At those times they run their TBolt against something pretty good and log the results The logs get put on a site somewhere Somebody else wants to do a comparison. They set up to monitor the same satellite at the same time. They log the data. They download the posted data. They run the math on the data, out comes a time comparison between the two locations. Should be fairly simple to try out. Anybody with a good house standard want to give it a try? 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] GPS Common View
On 07/08/2010 12:49 AM, Bob Camp wrote: Hi I just got through poking at a couple of TBolts with Lady Heather. It appears that you can indeed get the hardware and software to put the TBolt into single satellite mode. That may enable a pretty simple GPS common view setup. One way to do it: Somebody picks a set of sats and times that make sense. Since the constellation repeats it's going to be a fairly simple table of this sat / that time. At those times they run their TBolt against something pretty good and log the results The logs get put on a site somewhere Somebody else wants to do a comparison. They set up to monitor the same satellite at the same time. They log the data. They download the posted data. They run the math on the data, out comes a time comparison between the two locations. Should be fairly simple to try out. You could of course agree upon 2 or more commmon view sats. As long as they are observed at the same time and in good view for both sites, it should work just as well. 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] GPS Common View
Hi Oddly enough I happen to be set up to do 6 common view sats Bob On Jul 7, 2010, at 6:56 PM, Magnus Danielson wrote: On 07/08/2010 12:49 AM, Bob Camp wrote: Hi I just got through poking at a couple of TBolts with Lady Heather. It appears that you can indeed get the hardware and software to put the TBolt into single satellite mode. That may enable a pretty simple GPS common view setup. One way to do it: Somebody picks a set of sats and times that make sense. Since the constellation repeats it's going to be a fairly simple table of this sat / that time. At those times they run their TBolt against something pretty good and log the results The logs get put on a site somewhere Somebody else wants to do a comparison. They set up to monitor the same satellite at the same time. They log the data. They download the posted data. They run the math on the data, out comes a time comparison between the two locations. Should be fairly simple to try out. You could of course agree upon 2 or more commmon view sats. As long as they are observed at the same time and in good view for both sites, it should work just as well. 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. ___ 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] GPS Common View
Bob Camp wrote: Hi I just got through poking at a couple of TBolts with Lady Heather. It appears that you can indeed get the hardware and software to put the TBolt into single satellite mode. That may enable a pretty simple GPS common view setup. One way to do it: Somebody picks a set of sats and times that make sense. Since the constellation repeats it's going to be a fairly simple table of this sat / that time. At those times they run their TBolt against something pretty good and log the results The logs get put on a site somewhere Somebody else wants to do a comparison. They set up to monitor the same satellite at the same time. They log the data. They download the posted data. They run the math on the data, out comes a time comparison between the two locations. Should be fairly simple to try out. Anybody with a good house standard want to give it a try? Couldn't you run your data against Gipsy/OASIS or similar http://gipsy.jpl.nasa.gov/orms/index.html ___ 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] GPS Common View
Hi From a quick look it's not real clear how you would go about extracting time from the software suite. It's certainly useful for navigation though. A secondary gotcha is that the TBolt likely has some internal issues that distort the data a bit. Running a TBolt on both ends should wash out the ones that are firmware based. Bob On Jul 7, 2010, at 8:54 PM, jimlux wrote: Bob Camp wrote: Hi I just got through poking at a couple of TBolts with Lady Heather. It appears that you can indeed get the hardware and software to put the TBolt into single satellite mode. That may enable a pretty simple GPS common view setup. One way to do it: Somebody picks a set of sats and times that make sense. Since the constellation repeats it's going to be a fairly simple table of this sat / that time. At those times they run their TBolt against something pretty good and log the results The logs get put on a site somewhere Somebody else wants to do a comparison. They set up to monitor the same satellite at the same time. They log the data. They download the posted data. They run the math on the data, out comes a time comparison between the two locations. Should be fairly simple to try out. Anybody with a good house standard want to give it a try? Couldn't you run your data against Gipsy/OASIS or similar http://gipsy.jpl.nasa.gov/orms/index.html ___ 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] 5061A Problem Child - It Lives!
Completely agree congrats and thanks for the update. I may be getting back involved with my 5061a soon now that I have a HP pico/femto amp meter. By golly I will go hunting for the elusive I beam current ghost directly off the tube or at least learn that I can't. On Wed, Jul 7, 2010 at 6:29 AM, Didier Juges did...@cox.net wrote: Congratulations Joe!!! Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Tuesday, July 06, 2010 11:44 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] 5061A Problem Child - It Lives! Just a wrap up on the 5061A that had a Beam I but no 2nd Harmonic indication. I was originally stymied by swaps of modules with another 'functioning unit' with no help. I then swapped CS tubes with A4 Harmonic Generators attached and A11 Cesium controllers at which point neither unit worked. I added an A15 Power regulator swap and still neither unit worked. I undid the swaps, got the 'functioning unit' working again (found a leaky A11C2, a 2.2 uF film capacitor with a resistance of about 1800 ohms, that prevented the 2.8 KHz Control Oscillator from oscillating), then went through some tests of both units, assembly by assembly and found A7 faulty. Problem was a 'weak' Q1 (1854-0023, the input transistor in a 3 transistor amplifier)) with a Beta of about 20. An identical transistor at Q2 had a Beta of about 200. I installed a 2NA that had a Beta of about 150 and all was well. The 2nd Harmonic came up normally but the Alarm light would not go out. However, when put in Operate, the Continuous Operation light would come on and the unit seemed to 'lock' normally. I found an open Q20 and a shorted Q22 (both 1854-0003's) on the A14 Logic Assembly causing the Alarm light to stay on. Replaced these with 2NA's and now all seems well. I can't explain why swapping A7 modules early on did not resolve the 2nd Harmonic indication problem unless both A7's were 'weak' allowing them to work with a stronger signal but not a weak signal or all the swapping of tubes, back and forth, in and out, etc., fixed a dirty connection. On reflection, probably the latter. In any event, it works and seems to be one of my stronger tubes. I could not find any cross reference for either of these NPN transistors but the 2NA seemed to do just fine. Thanks for everyone's help. Joe ___ 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] Auto TBolt TC Adjust
Hi From looking at the numbers on a set of TBolt's it's apparent that adjusting the time constant after they have been on power for a while is a good idea. Something like: Start at 10 seconds until pps is within 10 ns for 5 minutes Run at 50 seconds until the same condition is met Bump to 200 seconds, check Bump to 1000 seconds More or less you would be making the TBolt do a dumbed down version of what the Z38xx's do. Before I go out and build up a gizmo to read TSIP and shoot the commands to the TBolt, I thought I'd see if somebody had already made one of these up. Anybody have one of these already? Thanks! 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] GPS Common View
Bob Camp wrote: Hi From a quick look it's not real clear how you would go about extracting time from the software suite. It's certainly useful for navigation though. A secondary gotcha is that the TBolt likely has some internal issues that distort the data a bit. Running a TBolt on both ends should wash out the ones that are firmware based. Bob If you're intersted send an email to one of the guys who is involved with this. I know that they do common-view time transfer, it just might not be with that package. JPL has a bunch of groups doing this kind of stuff in the building between where I park my car and where my office is. You might also try asking the folks at http://igscb.jpl.nasa.gov/ For instance, they log raw observables of all kinds http://igscb.jpl.nasa.gov/components/data.html http://igscb.jpl.nasa.gov/components/prods.html I'll ask around tomorrow, too. ___ 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] GPS Common View
Hi NIST publishes data on a per satellite basis as well. WIth all of these the big question will be weather the data is in fine enough buckets to be useful. I know that back when we had a NIST time transfer modem that they indeed had all the data to make it work. At least at that time the data they used was not available online. Of course they were indeed *selling* you the service on a monthly basis Bob On Jul 7, 2010, at 9:29 PM, jimlux wrote: Bob Camp wrote: Hi From a quick look it's not real clear how you would go about extracting time from the software suite. It's certainly useful for navigation though. A secondary gotcha is that the TBolt likely has some internal issues that distort the data a bit. Running a TBolt on both ends should wash out the ones that are firmware based. Bob If you're intersted send an email to one of the guys who is involved with this. I know that they do common-view time transfer, it just might not be with that package. JPL has a bunch of groups doing this kind of stuff in the building between where I park my car and where my office is. You might also try asking the folks at http://igscb.jpl.nasa.gov/ For instance, they log raw observables of all kinds http://igscb.jpl.nasa.gov/components/data.html http://igscb.jpl.nasa.gov/components/prods.html I'll ask around tomorrow, too. ___ 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] Auto TBolt TC Adjust
That could be done easily with my GPSMon project, just add code :) The project decodes the TSIP binary format, so it would not be so hard to decode the packets you need. At the moment, the project does not talk to the TBolt, and I forgot if the Tx routines are in the code. If they are not and someone is interested, I'll send you the code. It's open source by the way. http://www.ko4bb.com/Timing/GPSMonitor/ Didier KO4BB --Original Message-- From: Bob Camp Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: [time-nuts] Auto TBolt TC Adjust Sent: Jul 7, 2010 8:22 PM Hi From looking at the numbers on a set of TBolt's it's apparent that adjusting the time constant after they have been on power for a while is a good idea. Something like: Start at 10 seconds until pps is within 10 ns for 5 minutes Run at 50 seconds until the same condition is met Bump to 200 seconds, check Bump to 1000 seconds More or less you would be making the TBolt do a dumbed down version of what the Z38xx's do. Before I go out and build up a gizmo to read TSIP and shoot the commands to the TBolt, I thought I'd see if somebody had already made one of these up. Anybody have one of these already? Thanks! 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 BlackBerry Wireless thingy 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] Auto TBolt TC Adjust
Hi I suspect that I only need to decode one of the packets and send one of three or four specific strings. I could send them blind and hope they work, or actually confirm they took effect. Either way it should fit in a pretty small chip. Thanks! Bob On Jul 7, 2010, at 9:55 PM, Didier Juges wrote: That could be done easily with my GPSMon project, just add code :) The project decodes the TSIP binary format, so it would not be so hard to decode the packets you need. At the moment, the project does not talk to the TBolt, and I forgot if the Tx routines are in the code. If they are not and someone is interested, I'll send you the code. It's open source by the way. http://www.ko4bb.com/Timing/GPSMonitor/ Didier KO4BB --Original Message-- From: Bob Camp Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: [time-nuts] Auto TBolt TC Adjust Sent: Jul 7, 2010 8:22 PM Hi From looking at the numbers on a set of TBolt's it's apparent that adjusting the time constant after they have been on power for a while is a good idea. Something like: Start at 10 seconds until pps is within 10 ns for 5 minutes Run at 50 seconds until the same condition is met Bump to 200 seconds, check Bump to 1000 seconds More or less you would be making the TBolt do a dumbed down version of what the Z38xx's do. Before I go out and build up a gizmo to read TSIP and shoot the commands to the TBolt, I thought I'd see if somebody had already made one of these up. Anybody have one of these already? Thanks! 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 BlackBerry Wireless thingy 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.
Re: [time-nuts] Auto TBolt TC Adjust
Bob, It would be easy to start a timer when the TBolt reaches a certain state, and send specific commands after certain times, and restart the sequence if the TBolt loses lock. The processor's clock has 0.5% accuracy, which should be sufficient. There is plenty of code space left in the GPSMon processor. Didier Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Bob Camp li...@rtty.us Sender: time-nuts-boun...@febo.com Date: Wed, 7 Jul 2010 22:08:33 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] Auto TBolt TC Adjust Hi I suspect that I only need to decode one of the packets and send one of three or four specific strings. I could send them blind and hope they work, or actually confirm they took effect. Either way it should fit in a pretty small chip. Thanks! Bob On Jul 7, 2010, at 9:55 PM, Didier Juges wrote: That could be done easily with my GPSMon project, just add code :) The project decodes the TSIP binary format, so it would not be so hard to decode the packets you need. At the moment, the project does not talk to the TBolt, and I forgot if the Tx routines are in the code. If they are not and someone is interested, I'll send you the code. It's open source by the way. http://www.ko4bb.com/Timing/GPSMonitor/ Didier KO4BB --Original Message-- From: Bob Camp Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: [time-nuts] Auto TBolt TC Adjust Sent: Jul 7, 2010 8:22 PM Hi From looking at the numbers on a set of TBolt's it's apparent that adjusting the time constant after they have been on power for a while is a good idea. Something like: Start at 10 seconds until pps is within 10 ns for 5 minutes Run at 50 seconds until the same condition is met Bump to 200 seconds, check Bump to 1000 seconds More or less you would be making the TBolt do a dumbed down version of what the Z38xx's do. Before I go out and build up a gizmo to read TSIP and shoot the commands to the TBolt, I thought I'd see if somebody had already made one of these up. Anybody have one of these already? Thanks! 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 BlackBerry Wireless thingy 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 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] Auto TBolt TC Adjust
Hi I've been watching a number of TBolt's as they stabilize. Some make it to the ready for long time constant condition pretty quickly. Others take a *long* time to get there. There may be reasons for this. If so they are not very obvious. All of the units are in the same temperature environment (very stable), have their own supplies (well regulated), same antenna and signal levels, and are set up with the same options. My conclusion is that you do indeed need to watch them stabilize to know when to do the switch. Bob On Jul 7, 2010, at 10:37 PM, Didier Juges wrote: Bob, It would be easy to start a timer when the TBolt reaches a certain state, and send specific commands after certain times, and restart the sequence if the TBolt loses lock. The processor's clock has 0.5% accuracy, which should be sufficient. There is plenty of code space left in the GPSMon processor. Didier Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: Bob Camp li...@rtty.us Sender: time-nuts-boun...@febo.com Date: Wed, 7 Jul 2010 22:08:33 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] Auto TBolt TC Adjust Hi I suspect that I only need to decode one of the packets and send one of three or four specific strings. I could send them blind and hope they work, or actually confirm they took effect. Either way it should fit in a pretty small chip. Thanks! Bob On Jul 7, 2010, at 9:55 PM, Didier Juges wrote: That could be done easily with my GPSMon project, just add code :) The project decodes the TSIP binary format, so it would not be so hard to decode the packets you need. At the moment, the project does not talk to the TBolt, and I forgot if the Tx routines are in the code. If they are not and someone is interested, I'll send you the code. It's open source by the way. http://www.ko4bb.com/Timing/GPSMonitor/ Didier KO4BB --Original Message-- From: Bob Camp Sender: time-nuts-boun...@febo.com To: Time-Nuts ReplyTo: Time-Nuts Subject: [time-nuts] Auto TBolt TC Adjust Sent: Jul 7, 2010 8:22 PM Hi From looking at the numbers on a set of TBolt's it's apparent that adjusting the time constant after they have been on power for a while is a good idea. Something like: Start at 10 seconds until pps is within 10 ns for 5 minutes Run at 50 seconds until the same condition is met Bump to 200 seconds, check Bump to 1000 seconds More or less you would be making the TBolt do a dumbed down version of what the Z38xx's do. Before I go out and build up a gizmo to read TSIP and shoot the commands to the TBolt, I thought I'd see if somebody had already made one of these up. Anybody have one of these already? Thanks! 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 BlackBerry Wireless thingy 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 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] 5061A Problem Child - It Lives!
I have had a lot of fun repairing these units and I have learned a lot from the experience and from folks on the list, particularly Bert Kehren, Corby Dawson and John Miles. If you can think of a way I can help, let me know. I was able to avoid the need for a pico/femto amp meter. I probably would have burned it up anyway. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed Sent: Wednesday, July 07, 2010 8:21 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] 5061A Problem Child - It Lives! Completely agree congrats and thanks for the update. I may be getting back involved with my 5061a soon now that I have a HP pico/femto amp meter. By golly I will go hunting for the elusive I beam current ghost directly off the tube or at least learn that I can't. On Wed, Jul 7, 2010 at 6:29 AM, Didier Juges did...@cox.net wrote: Congratulations Joe!!! Didier -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Tuesday, July 06, 2010 11:44 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] 5061A Problem Child - It Lives! Just a wrap up on the 5061A that had a Beam I but no 2nd Harmonic indication. I was originally stymied by swaps of modules with another 'functioning unit' with no help. I then swapped CS tubes with A4 Harmonic Generators attached and A11 Cesium controllers at which point neither unit worked. I added an A15 Power regulator swap and still neither unit worked. I undid the swaps, got the 'functioning unit' working again (found a leaky A11C2, a 2.2 uF film capacitor with a resistance of about 1800 ohms, that prevented the 2.8 KHz Control Oscillator from oscillating), then went through some tests of both units, assembly by assembly and found A7 faulty. Problem was a 'weak' Q1 (1854-0023, the input transistor in a 3 transistor amplifier)) with a Beta of about 20. An identical transistor at Q2 had a Beta of about 200. I installed a 2NA that had a Beta of about 150 and all was well. The 2nd Harmonic came up normally but the Alarm light would not go out. However, when put in Operate, the Continuous Operation light would come on and the unit seemed to 'lock' normally. I found an open Q20 and a shorted Q22 (both 1854-0003's) on the A14 Logic Assembly causing the Alarm light to stay on. Replaced these with 2NA's and now all seems well. I can't explain why swapping A7 modules early on did not resolve the 2nd Harmonic indication problem unless both A7's were 'weak' allowing them to work with a stronger signal but not a weak signal or all the swapping of tubes, back and forth, in and out, etc., fixed a dirty connection. On reflection, probably the latter. In any event, it works and seems to be one of my stronger tubes. I could not find any cross reference for either of these NPN transistors but the 2NA seemed to do just fine. Thanks for everyone's help. Joe ___ 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.
