Re: [time-nuts] Heather Problem..
For any programs which may need user-level access to their directory (e.g. for the user to edit a .INI file) I now use a \Tools\ rather than the Program Files directory, so I would use: C:\Tools\Heather\ and so forth. It also avoids the requirement for quotation marks round paths with spaces. This makes things easier on Windows Vista and Windows-7, although you lose a little protection, so I would only use this for programs I trusted. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Heather Problem..
I like your \Tools suggestion. Some additional solutions: 1) Create a virtual drive letter for Program Files, as in: subst P: c:\profiles files Then run p:\heather\heather.exe 2) Use an environment variable, as in: set LH=c:\program files\heather\heather.exe Then to run heather, type %LH% 3) Create a batch file named LH.bat in some directory in your path. E.g., echo call c:\program files\heather\heather.exe %* LH.bat Then to run heather, just type LH /tvb - Original Message - From: David J Taylor david-tay...@blueyonder.co.uk To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Monday, July 23, 2012 11:09 PM Subject: Re: [time-nuts] Heather Problem.. For any programs which may need user-level access to their directory (e.g. for the user to edit a .INI file) I now use a \Tools\ rather than the Program Files directory, so I would use: C:\Tools\Heather\ and so forth. It also avoids the requirement for quotation marks round paths with spaces. This makes things easier on Windows Vista and Windows-7, although you lose a little protection, so I would only use this for programs I trusted. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Phase modulation detection/NIST plan
HI A died in the wool Time Nut who doesn't care what time it is - what's the world coming to Bob Hi Bob, I think you mean dyed in the wool. A *died* in the wool time nut could be used to describe a frozen 19th century sextant and sidereal pendulum clock carrying Antarctic explorer. ;-) /tvb ___ 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] time-nuts Digest, Vol 96, Issue 89
I mean BFT92 in sot23, sry for typo. lc ct1dmk. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ct1dmk Sent: Monday, July 23, 2012 7:26 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Zero-Crossing Detector Design? of PNP transistors (BFT91) ___ 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] HP 3586 Questions
It was reasonably easy to get to the input connector to replace it. I haven't seen the firmware source code but would be interested if it became available to play with. Some HP instruments used proprietary CPUs (or nanoprocessors) which might be tricky to play with due to their instruction set not being published. Peter On 7/23/2012 11:25 PM, Chuck Forsberg WA7KGX N2469R wrote: Now that I have my new [30 year old] HP 3586 making measurements over the GPIB bus I have a few questions. Setting AVErage makes measurements take about three seconds. Is there a way to control the number of samples averaged? How difficult is it to open up the 3586 to replace the input connector with a BNC connector? Is there a way to update and/or hack the firmware? Is source code available? ___ 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] HP 3586 Questions
I did install a bnc connector for input - pain - it took a few hours. Save yourself a lot of grief and purchase a Canare bcj-vwp bnc adapter from Markertech or others. Works fine. Bill Riches, WA2DVU Now that I have my new [30 year old] HP 3586 making measurements over the GPIB bus I have a few questions. Setting AVErage makes measurements take about three seconds. Is there a way to control the number of samples averaged? How difficult is it to open up the 3586 to replace the input connector with a BNC connector? Is there a way to update and/or hack the firmware? Is source code available? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] HP 3586 Questions
It was very easy to replace the input connector on my 3586A, not sure about the other versions. Didier KO4BB Bill Riches bill.ric...@verizon.net wrote: I did install a bnc connector for input - pain - it took a few hours. Save yourself a lot of grief and purchase a Canare bcj-vwp bnc adapter from Markertech or others. Works fine. Bill Riches, WA2DVU Now that I have my new [30 year old] HP 3586 making measurements over the GPIB bus I have a few questions. Setting AVErage makes measurements take about three seconds. Is there a way to control the number of samples averaged? How difficult is it to open up the 3586 to replace the input connector with a BNC connector? Is there a way to update and/or hack the firmware? Is source code available? -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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. -- Sent from my Motorola Droid Razr phone with K-9 Mail. Please excuse my brevity. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. On Tue, Jul 24, 2012 at 2:18 PM, Chris Wilson ch...@chriswilson.tv wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. Thanks for the reply Azelio. Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife Will be needing some sort of line distribution amplifier soon, been buying test gear! I believe some people have had good results with TV aerial distribution amps? Thanks. -- Best Regards, Chris Wilson. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Mine are not handy, so I'm not sure it has 50% output duty, but the Ballantine 6130A Time Mark Generator is a potential candidate. It's not much more than a chain of 7490 dividers fed from a 10MHz source, and has a (non-nut) ovenized oscilltor built in. Even has synchronized multipliers that go up to 500MHz. I couldn't resist buying a 2nd at Dayton this year, cost all of $5 from a dumpster diver late Sunday. A fair price is more in the $30 - $40 range, which is what I paid for my first one. Bob LaJeunesse From: Chris Wilson ch...@chriswilson.tv To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tue, July 24, 2012 8:52:28 AM Subject: Re: [time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output? Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
A Tektronix DD501 will do divide by 10, or any number from 2 to 9. -John === Mine are not handy, so I'm not sure it has 50% output duty, but the Ballantine 6130A Time Mark Generator is a potential candidate. It's not much more than a chain of 7490 dividers fed from a 10MHz source, and has a (non-nut) ovenized oscilltor built in. Even has synchronized multipliers that go up to 500MHz. I couldn't resist buying a 2nd at Dayton this year, cost all of $5 from a dumpster diver late Sunday. A fair price is more in the $30 - $40 range, which is what I paid for my first one. Bob LaJeunesse From: Chris Wilson ch...@chriswilson.tv To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tue, July 24, 2012 8:52:28 AM Subject: Re: [time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output? Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
A Tektronix DD501 will do divide by 10, or any number from 2 to 9. -John Thanks, was hoping for something as a permanent, small and cheap fitting, standalone. Don't really want to tie up my 7233 running something to run something else IYSWIM? Was hoping China Town would have the answer for low $$'s :) -- Best Regards, Chris Wilson. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
I would do a dead bug construction and insert inside the equipment and mark it 10MHz reference. All your instruments will be sync.! Raj, vu2zap At 24-07-2012, you wrote: Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. On Tue, Jul 24, 2012 at 2:18 PM, Chris Wilson ch...@chriswilson.tv wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
I think the HP 5087 Distribution Amp has a card that will do divide-by-ten. -John == Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Chris, my vote is for the David Partridge 'time-nuts' frequency divider that was discussed and optimised here in detail some time ago. It divides everything you might need from the 10 MHz input. There are separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that can be configured for 100 kHz / 10 kHz / 1 kHz / 100 Hz / 10 Hz / 1 Hz. I think David might still have some populated boards. Adrian Chris Wilson schrieb: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH On Jul 24, 2012, at 7:55, John Ackermann N8UR j...@febo.com wrote: Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
On Tue, Jul 24, 2012 at 7:28 AM, Chris Wilson ch...@chriswilson.tv wrote: A Tektronix DD501 will do divide by 10, or any number from 2 to 9. -John Thanks, was hoping for something as a permanent, small and cheap fitting, standalone. Don't really want to tie up my 7233 running something to run something else IYSWIM? Was hoping China Town would have the answer for low $$'s :) Get a solderless bread board place the 7400 TTL divider chip on that and power it with a wall wort cube. Mount it with sticky tape on the back of the counter.Should take all of about 30 minutes to assemble. The next step up is mount some BHC and coaxial power jacks manhattan style n a some PCB stock then super-glue the 7400 chips leads-up (dead bugs) that might take an hour. Either way no half finished project if you don't stop until you are done. 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Chris, my vote is for the David Partridge 'time-nuts' frequency divider that was discussed and optimised here in detail some time ago. It divides everything you might need from the 10 MHz input. There are separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that can be configured for 100 kHz / 10 kHz / 1 kHz / 100 Hz / 10 Hz / 1 Hz. I think David might still have some populated boards. Adrian Didn't know about that, and i was at David's house last week, as well... Hmmm! Sounds the way to go, I'll e-mail him later, thank you Adrian. 24/07/2012 19:13 -- Best Regards, Chris Wilson. ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Chris, A PIC requires 4 clock cycles per instruction which limits the maximum output rate a PIC can provide as partial instruction times can't be used. With a 10 MHz input each instruction takes 400ns and if duty cycle isn't an issue nop instructions can be added each loop to extend the cycle period giving the following maximum PIC output rates with a 10 MHz clock. 2 instructions 1.25 MHz 50% duty cycle 3 instructions 833.333 KHz 33% duty cycle 4 instructions 625 KHz 25% duty cycle 5 instructions 500 KHz 20% duty cycle While a PIC can produce almost any division ratio for slower output rates the 4 clocks per instruction time limits the maximum rate a PIC can produce and generating a 1 MHz output with a 10 MHz clock is not an option. Richard John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH On Jul 24, 2012, at 7:55, John Ackermann N8UR j...@febo.com wrote: Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] What's the easiest way to divide by 10 forThunderbolt reference output?
John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH The PIC has a 4:1 external clock / internal instruction cycle ratio so a software-based divider can't divide by a low number like 10. See www.LeapSecond.com/picdiv for details, and source code. Although initially intended as a 1 PPS divider, the [re]programmable PIC and TAPR T2-Mini make a compact frequency divider solution for frequencies from once a day to 100 kHz. As far as frequencies close to 10 MHz -- I assumed that division by 2 (e.g., 10 MHz - 5 MHz) or division by 10 (e.g., 10 MHz - 1 MHz) were simple to implement using a single IC (one flip-flop or decade counter). The '7490 or '390 come to mind. /tvb ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
TVB can give a better answer, but in general the number of clock cycles required per instruction limits the minimum divide ratio. Tom whipped up a special PIC to get the highest possible output rate for a set of tests we were doing, and given the 20 MHz maximum input clock, we got about 800 kHz output. John --- On 7/24/2012 1:05 PM, Chris Hoffman, KG6O wrote: John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH On Jul 24, 2012, at 7:55, John Ackermann N8UR j...@febo.com wrote: Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] HP 3586 Questions
I found some information on the 3586 by looking at the service manual PDF. The processor is a Motorola 6800, the same family I used in 1975 for Sidereal. According to the parts list, the 32768 ROMS are in sockets. Two revisions of firmware are discussed. The newer revision can be identified by the 3586 starting up with 10k input instead of 75 ohms. -- Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc The High Reliability Software 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ 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] HP 3586 Questions
Hi Gang, Has anyone looked into working over the filters and detection circuitry in the C model. I have not looked to see if that part is discrete or firmware. Thanks, Hadley K7MLR ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
Hi With some micros you can play with the PWM outputs to get a bit faster than the instruction cycle would allow. There are always constraints (like binary division) on that as well. Bob On Jul 24, 2012, at 5:21 PM, John Ackermann N8UR wrote: TVB can give a better answer, but in general the number of clock cycles required per instruction limits the minimum divide ratio. Tom whipped up a special PIC to get the highest possible output rate for a set of tests we were doing, and given the 20 MHz maximum input clock, we got about 800 kHz output. John --- On 7/24/2012 1:05 PM, Chris Hoffman, KG6O wrote: John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH On Jul 24, 2012, at 7:55, John Ackermann N8UR j...@febo.com wrote: Unfortunately, the TAPR T2-Mini divider (http://www.tapr.org/kits_t2-mini.html) can't quite get to 1 MHz from 10 MHz with the PIC divider chip due to limitations in the chip architecture. However, nothing says you couldn't dead bug in a decade divider chip in place of the PIC, and let the T2-Mini provide the input conditioning, output driver, voltage regulation, connectorization, etc. for you, making it much a smaller project. John On 7/24/2012 8:18 AM, Chris Wilson wrote: 24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. ___ 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] HP 58503A Dim Display Replacement
Hi, I have an older HP 58 503A with option 001 display but it is very dim from age. Does anyone know of a replacement display IC for this? Thanks Jeff ___ 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] What's the easiest way to divide by 10 forThunderbolt reference output?
A part like any the Cypress PSoC family is much more flexible (but potentially harder to program) than the PIC because it has hardware blocks that can be made to do very useful work independent of the processor. The processor can run on its internal RC oscillator while one digital block would take an external clock and divide it down by any value up to 256. Like the PIC software is free and development tools can be had at low cost. Bob L. To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tue, July 24, 2012 2:51:00 PM Subject: Re: [time-nuts] What's the easiest way to divide by 10 forThunderbolt reference output? John, That's interesting to me. What exactly are the actual structural limitations of [that] pic? -CH ___ 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] What's the easiest way to divide by 10 forThunderbolt referen...
The cheapest is a 74HC90 with a 74HC14 one as input the other five as output. Can also be LS. The best with all bells and whistles is a Altera MAX 3000 gate array with two selectable outputs paralleling four outputs with resisters, transformer input with Wenzeland sync input. No SMD's very solderable but needs a PCB and its cost is volume dependant. $ 6 if 40 get ordered and the rest of the parts less than $ 9. There is also room to bring out all decade stages5/10 MHz input select and 80/20 or 50/50 duty cycle. Bert Kehren ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
From: Chris Wilson ch...@chriswilson.tv Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. Thanks for the reply Azelio. Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife Will be needing some sort of line distribution amplifier soon, been buying test gear! I believe some people have had good results with TV aerial distribution amps? Thanks. -- Best Regards, Chris Wilson. Chris, I use a couple Extron ADA3-80 Audio/Video distribution amps for my bench. They are almost always available on our favorite auction site. Search for extron distribution amp They are low cost ($15 - $50) and depending on the exact model, can distribute up to 12 channels. TV antenna amplifiers generally won't do the job... they are meant for RF from 50 MHz upwards. Dave M A woman has the last word in any argument. Anything a man says after that is the beginning of a new argument. ___ 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] Fw: What's the easiest way to divide by 10 for Thunderbolt reference output?
Dave M wrote: From: Chris Wilson ch...@chriswilson.tv Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. Thanks for the reply Azelio. Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife Will be needing some sort of line distribution amplifier soon, been buying test gear! I believe some people have had good results with TV aerial distribution amps? Thanks. -- Best Regards, Chris Wilson. Chris, I use a couple Extron ADA3-80 Audio/Video distribution amps for my bench. They are almost always available on our favorite auction site. Search for extron distribution amp They are low cost ($15 - $50) and depending on the exact model, can distribute up to 12 channels. TV antenna amplifiers generally won't do the job... they are meant for RF from 50 MHz upwards. Dave M A woman has the last word in any argument. Anything a man says after that is the beginning of a new argument. Sorry, I hit the SEND button a moment too soon. I meant to add that you can get more info about the Extron DAs at http://www.ko4bb.com/ham_radio/Extron_3_80/ Do go there and read. Good info there. Dave M A woman has the last word in any argument. Anything a man says after that is the beginning of a new argument. ___ 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] HP 3586 Questions
There is a quite the knowledge of this and many other HP/Agilent instruments on the Yahoo group hp_agilent_equipment. That is not to say there isn't here. But just more members since this is time-nuts not TM-nuts. Including reference to at least one web site that has details on things like the difference between the A, B, and C version (there are more the three versions), adding AGC, etc, etc, I won't list them here but they can be found via Google 3586A/B/C. KO4BB and VE2AZ are a good place to start. -pete On Tue, Jul 24, 2012 at 4:49 PM, Had h...@to-way.com wrote: Hi Gang, Has anyone looked into working over the filters and detection circuitry in the C model. I have not looked to see if that part is discrete or firmware. Thanks, Hadley K7MLR ___ 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] I am looking for the email address for David Partridge
Hi time-nuts guys, I am looking for the email address for David Partridge. I want to find out more information on the 'time-nuts' frequency divider that was discussed and optimised here in detail some time ago. Thankyou Ken Kubick ___ 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] Looking for info on an old WWVB receiver
I recently picked up an interesting early 1970s vintage WWVB receiver, Model 630, made by Specific Products of Monrovia, CA - that's what the adhesive sticker on the front says, and the name 1 MHz Time Base Calibrator (Utilizes WWVB accuracy of 2 parts in 10^11). There's also a pair of banana jacks labeled 1 MHz Input, a row of incandescent lamps for a signal strength indicator, and a power switch. The back says Model LF 60S, and has six RCA jacks for 100 kHz Output, 60 kHz Output, Recorder Output, Antenna Input, (divide sign) 10 Output, and Time Code Output. There's also the line cord and a +12VDC output RCA jack. I'm wondering if anyone knows anything or sources of info about this thing. With all the recent talk of WWVB changing to spread-spectrum, it may be useless anyway, except for some parts, but I'm curious about whether it's worth saving. Ed ___ 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] What's the easiest way to divide by 10 for Thunderbolt reference output?
I agree - just tack a CMOS or LSTTL decade divider right inside the equipment for now, then provide a fancy divider in your distribution amp if you get around to it. It's funny that entire extra instruments and programming microcontrollers are being discussed to replace a simple fifty year old IC solution. That's what you get when you say you want something already built and ready to use. The definition of easiest can take on quite a range. Ed ___ 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] Looking for info on an old WWVB receiver
On 7/24/12 8:48 PM, ed breya wrote: I recently picked up an interesting early 1970s vintage WWVB receiver, Model 630, made by Specific Products of Monrovia, CA - that's what the adhesive sticker on the front says, and the name 1 MHz Time Base Calibrator (Utilizes WWVB accuracy of 2 parts in 10^11). There's also a pair of banana jacks labeled 1 MHz Input, a row of incandescent lamps for a signal strength indicator, and a power switch. The back says Model LF 60S, and has six RCA jacks for 100 kHz Output, 60 kHz Output, Recorder Output, Antenna Input, (divide sign) 10 Output, and Time Code Output. There's also the line cord and a +12VDC output RCA jack. I'm wondering if anyone knows anything or sources of info about this thing. With all the recent talk of WWVB changing to spread-spectrum, it may be useless anyway, except for some parts, but I'm curious about whether it's worth saving. Well, a bit of casual googling shows that Specfic Products made lots of this kind of thing, and they are shown as being in, variously, Los Angeles, Woodland Hills, and Monrovia. Technically Woodland Hills is in the city of LA, but in any case, they seem to have moved a bit. I found a reference in a USGS report Specific Products, 1965, NBS time code decoder chart: Bulletin Number 226, 21051 Costanso St., Woodland Hills, Calif. Now, as it happens, that's the address (today) of someone's garage. They seem to have been a popular item for generating timecode in various recorders for USGS (turned up several mentions in papers from the 60s and 70s recording things like volcanic eruptions and the like) ___ 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.
