Re: [time-nuts] Pictic II mods
Hi, I only worry about the UART working with other UARTS. And at the 1% spec, the PIC UARTs , in my experience, always do If you are concerned, use 2 stop bits. -Chuck Harris Bob Camp wrote: Hi A lot depends on just what you worry about. Most clock specs for serial com are in the 0.01 to 0.1% range. Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] PICTIC II PCB group buy
Add me to the list please. Thanks 73s Randall ___ 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] PICTIC II PCB group buy
Add me to the list. 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] Pictic II mods
Group Members, Beginning in the days of the 1200 bps DPSK modem, clock crystals were specified to .01% to allow the demodulator at the receiving end to recover the clock in the data-stream and lock to it. The asynchronous serial port attached to the modem needed to be no more accurate than 1%, as the modem included an async-to-sync converter that would strip every eighth stop bit, if necessary, to reduce the incoming data rate to the modem rate. The sync-to-async converter in the receiving modem re-inserted the missing stop bits. The case of incoming data under-speed was handled in a similar manner. The older FSK modems were much different. They would shift from mark to space tones at the data-rate you used. The filters and tone spacings were typically optimized for 300 bps, but across town, 450 bps was achievable. Peter Putnam On 7/2/2010 6:17 PM, Bob Camp wrote: Hi A lot depends on just what you worry about. Most clock specs for serial com are in the 0.01 to 0.1% range. Bob On Jul 2, 2010, at 9:02 PM, Chuck Harris wrote: The PIC's internal silicon clock is better than 1% over the entire industrial voltage and temperature range. They are accurate enough. -Chuck Harris Bob Camp wrote: Hi I believe he's using the internal clock on the PIC. It's not super accurate, so running a lot of data can be an issue. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 3:41 PM To: time-nuts@febo.com Subject: [time-nuts] Pictic II mods Looking at Richard's code in PICTICII.ASM : bsf TXSTA,BRGH;set USART hi speed mode movlw D'51' ;set async rate at 9600 baud (51. for 8 MHz int, BRGH=1) movwf SPBRG Then '25' would be 19,200 baud and '12' would be 38,400 baud Need to test this but could be a way to get more data out. Stanley ___ 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] Pictic II mods
Bob, I have posted a code revision on the WIKI that provides serial commands for modifying the OSCTUNE and SPBRG registers for those that might want to adjust the baud rate and internal oscillator timing and don't have facilities for programming the PIC. These commands won't alter the default values so re-establishing communications at the default rate after an incorrectly entered value can be done by a power cycle. But they will need to be re-entered after any power-up to change the baud or oscillator rate from the default 9600 baud and factory calibrated 8M oscillator rate. Richard > Hi > > The gotcha with the tune register is that it's not much help for those > without a > PIC programmer... > > Bob > > > On Jul 2, 2010, at 8:15 PM, Richard H McCorkle wrote: > >> Bob, >> Another option with the 16F688 is to "tweak" the internal oscillator >> rate slightly to give the proper baud rate. The code includes the >> following two lines (normally commented out) to do this. >> >> ;movlw 0x00;put the cal value in OSCTUNE >> ;movwf OSCTUNE ;to calibrate oscillator >> >>> From the Spec Sheet: >> >> The HFINTOSC is factory calibrated but can be adjusted in software >> by writing to the OSCTUNE register. The default value of the OSCTUNE >> register is 0. The value is a 5-bit twos complement number. When >> the OSCTUNE register is modified, the HFINTOSC frequency will begin >> shifting to the new frequency. Code execution continues during this >> shift. >> >> bit 4-0 TUN<4:0>: Frequency Tuning bits >> >> 0 = Maximum frequency >> 1 = Increasing Frequency >> 0 = Oscillator module is running at the calibrated frequency. >> 1 = Decreasing Frequency >> 1 = Minimum frequency >> >> Richard >> >> ___ 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 mods
Hi A lot depends on just what you worry about. Most clock specs for serial com are in the 0.01 to 0.1% range. Bob On Jul 2, 2010, at 9:02 PM, Chuck Harris wrote: > The PIC's internal silicon clock is better than 1% over the entire industrial > voltage and temperature range. They are accurate enough. > > -Chuck Harris > > Bob Camp wrote: >> Hi >> >> I believe he's using the internal clock on the PIC. It's not super accurate, >> so running a lot of data can be an issue. >> >> Bob >> >> -Original Message- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Stanley Reynolds >> Sent: Friday, July 02, 2010 3:41 PM >> To: time-nuts@febo.com >> Subject: [time-nuts] Pictic II mods >> >> Looking at Richard's code in PICTICII.ASM : >> >>bsf TXSTA,BRGH;set USART hi speed mode >>movlw D'51' ;set async rate at 9600 baud (51. for >> 8 >> MHz int, BRGH=1) >>movwf SPBRG >> >> Then '25' would be 19,200 baud >> and '12' would be 38,400 baud >> >> Need to test this but could be a way to get more data out. >> >> Stanley > > ___ > 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 mods
The PIC's internal silicon clock is better than 1% over the entire industrial voltage and temperature range. They are accurate enough. -Chuck Harris Bob Camp wrote: Hi I believe he's using the internal clock on the PIC. It's not super accurate, so running a lot of data can be an issue. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 3:41 PM To: time-nuts@febo.com Subject: [time-nuts] Pictic II mods Looking at Richard's code in PICTICII.ASM : bsf TXSTA,BRGH;set USART hi speed mode movlw D'51' ;set async rate at 9600 baud (51. for 8 MHz int, BRGH=1) movwf SPBRG Then '25' would be 19,200 baud and '12' would be 38,400 baud Need to test this but could be a way to get more data out. Stanley ___ 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 mods
Hi The gotcha with the tune register is that it's not much help for those without a PIC programmer... Bob On Jul 2, 2010, at 8:15 PM, Richard H McCorkle wrote: > Bob, > Another option with the 16F688 is to "tweak" the internal oscillator > rate slightly to give the proper baud rate. The code includes the > following two lines (normally commented out) to do this. > > ; movlw 0x00;put the cal value in OSCTUNE > ; movwf OSCTUNE ;to calibrate oscillator > >> From the Spec Sheet: > > The HFINTOSC is factory calibrated but can be adjusted in software > by writing to the OSCTUNE register. The default value of the OSCTUNE > register is ‘0’. The value is a 5-bit two’s complement number. When > the OSCTUNE register is modified, the HFINTOSC frequency will begin > shifting to the new frequency. Code execution continues during this > shift. > > bit 4-0 TUN<4:0>: Frequency Tuning bits > > 0 = Maximum frequency > 1 = Increasing Frequency > 0 = Oscillator module is running at the calibrated frequency. > 1 = Decreasing Frequency > 1 = Minimum frequency > > Richard > > >> Hi >> >> Yup, and as you go to higher baud rates the +/- one makes for a bigger "hop" >> in the >> baud rate. >> >> One cute way to attack the problem: >> >> Set the baud rate so it *should* be fast >> Set the PIC transmitter to send two stop bits (or marking parity and two >> stop bits >> if you can). >> Set the PC receiver to look for one stop bit and no parity. >> >> Net result is that you can tolerate a much higher baud rate error in a >> "transmit >> mostly" application like this one. >> >> Bob >> >> >> On Jul 2, 2010, at 5:44 PM, Stanley Reynolds wrote: >> >>> yes, internal clock, may need to tune the osc or try +- one number, >>> external osc >>> pins are in use. >>> >>> Stanley >>> >>> >>> >>> - Original Message >>> From: Bob Camp >>> To: Discussion of precise time and frequency measurement >>> >>> Sent: Fri, July 2, 2010 4:11:11 PM >>> Subject: Re: [time-nuts] Pictic II mods >>> >>> Hi >>> >>> I believe he's using the internal clock on the PIC. It's not super accurate, >>> so running a lot of data can be an issue. >>> >>> Bob >>> >>> -Original Message- >>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >>> Behalf Of Stanley Reynolds >>> Sent: Friday, July 02, 2010 3:41 PM >>> To: time-nuts@febo.com >>> Subject: [time-nuts] Pictic II mods >>> >>> Looking at Richard's code in PICTICII.ASM : >>> >>> bsf TXSTA,BRGH;set USART hi speed mode >>> movlw D'51' ;set async rate at 9600 baud (51. for >>> 8 >>> MHz int, BRGH=1) >>> movwf SPBRG >>> >>> Then '25' would be 19,200 baud >>> and '12' would be 38,400 baud >>> >>> Need to test this but could be a way to get more data out. >>> >>> Stanley >>> >>> ___ >>> 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.
Re: [time-nuts] Pic programing for the PICTIC II
Stanley, I had sent you an email off list requesting the 4 boards. First was for 2 than an update changing it to 4. Didn't want to get a 'double order'. I can easily order the parts via Mouser. The 'link' to the project looks good. However, I anticipate the need for some help with the programming but I look forward to trying to learn the nuts and bolts of this. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 7:28 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Pic programing for the PICTIC II Joe, Will add you to my list for boards, perhaps someone else here can help with the PIC chips. Stanley - Original Message From: J. L. Trantham To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 6:33:56 PM Subject: Re: [time-nuts] Pic programing for the PICTIC II I requested 4 boards and I will need 4 of the 16F688's. However, one of my goals for this is to learn to do the programming. Therefore, getting some 'pre-programmed' chips to compare with my own programmed chips will be very helpful. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 10:37 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Pic programing for the PICTIC II - Original Message From: paul swed To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:27:26 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II Whats your board count so far?? 23 people my guess is 40-50 boards 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. 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.
Re: [time-nuts] Pic programing for the PICTIC II
Joe, Will add you to my list for boards, perhaps someone else here can help with the PIC chips. Stanley - Original Message From: J. L. Trantham To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 6:33:56 PM Subject: Re: [time-nuts] Pic programing for the PICTIC II I requested 4 boards and I will need 4 of the 16F688's. However, one of my goals for this is to learn to do the programming. Therefore, getting some 'pre-programmed' chips to compare with my own programmed chips will be very helpful. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 10:37 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Pic programing for the PICTIC II - Original Message From: paul swed To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:27:26 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II Whats your board count so far?? 23 people my guess is 40-50 boards 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. 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] Pic programing for the PICTIC II
I requested 4 boards and I will need 4 of the 16F688's. However, one of my goals for this is to learn to do the programming. Therefore, getting some 'pre-programmed' chips to compare with my own programmed chips will be very helpful. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 10:37 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Pic programing for the PICTIC II - Original Message From: paul swed To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:27:26 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II Whats your board count so far?? 23 people my guess is 40-50 boards 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. 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] Pictic II mods
Bob, Another option with the 16F688 is to "tweak" the internal oscillator rate slightly to give the proper baud rate. The code includes the following two lines (normally commented out) to do this. ; movlw 0x00;put the cal value in OSCTUNE ; movwf OSCTUNE ;to calibrate oscillator >From the Spec Sheet: The HFINTOSC is factory calibrated but can be adjusted in software by writing to the OSCTUNE register. The default value of the OSCTUNE register is 0. The value is a 5-bit twos complement number. When the OSCTUNE register is modified, the HFINTOSC frequency will begin shifting to the new frequency. Code execution continues during this shift. bit 4-0 TUN<4:0>: Frequency Tuning bits 0 = Maximum frequency 1 = Increasing Frequency 0 = Oscillator module is running at the calibrated frequency. 1 = Decreasing Frequency 1 = Minimum frequency Richard > Hi > > Yup, and as you go to higher baud rates the +/- one makes for a bigger "hop" > in the > baud rate. > > One cute way to attack the problem: > > Set the baud rate so it *should* be fast > Set the PIC transmitter to send two stop bits (or marking parity and two stop > bits > if you can). > Set the PC receiver to look for one stop bit and no parity. > > Net result is that you can tolerate a much higher baud rate error in a > "transmit > mostly" application like this one. > > Bob > > > On Jul 2, 2010, at 5:44 PM, Stanley Reynolds wrote: > >> yes, internal clock, may need to tune the osc or try +- one number, external >> osc >> pins are in use. >> >> Stanley >> >> >> >> - Original Message >> From: Bob Camp >> To: Discussion of precise time and frequency measurement >> Sent: Fri, July 2, 2010 4:11:11 PM >> Subject: Re: [time-nuts] Pictic II mods >> >> Hi >> >> I believe he's using the internal clock on the PIC. It's not super accurate, >> so running a lot of data can be an issue. >> >> Bob >> >> -Original Message- >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >> Behalf Of Stanley Reynolds >> Sent: Friday, July 02, 2010 3:41 PM >> To: time-nuts@febo.com >> Subject: [time-nuts] Pictic II mods >> >> Looking at Richard's code in PICTICII.ASM : >> >>bsf TXSTA,BRGH;set USART hi speed mode >>movlw D'51' ;set async rate at 9600 baud (51. for >> 8 >> MHz int, BRGH=1) >>movwf SPBRG >> >> Then '25' would be 19,200 baud >> and '12' would be 38,400 baud >> >> Need to test this but could be a way to get more data out. >> >> Stanley >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Pictic II mods
Hi Yup, and as you go to higher baud rates the +/- one makes for a bigger "hop" in the baud rate. One cute way to attack the problem: Set the baud rate so it *should* be fast Set the PIC transmitter to send two stop bits (or marking parity and two stop bits if you can). Set the PC receiver to look for one stop bit and no parity. Net result is that you can tolerate a much higher baud rate error in a "transmit mostly" application like this one. Bob On Jul 2, 2010, at 5:44 PM, Stanley Reynolds wrote: > yes, internal clock, may need to tune the osc or try +- one number, external > osc > pins are in use. > > Stanley > > > > - Original Message > From: Bob Camp > To: Discussion of precise time and frequency measurement > Sent: Fri, July 2, 2010 4:11:11 PM > Subject: Re: [time-nuts] Pictic II mods > > Hi > > I believe he's using the internal clock on the PIC. It's not super accurate, > so running a lot of data can be an issue. > > Bob > > -Original Message- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Stanley Reynolds > Sent: Friday, July 02, 2010 3:41 PM > To: time-nuts@febo.com > Subject: [time-nuts] Pictic II mods > > Looking at Richard's code in PICTICII.ASM : > >bsf TXSTA,BRGH;set USART hi speed mode >movlw D'51' ;set async rate at 9600 baud (51. for > 8 > MHz int, BRGH=1) >movwf SPBRG > > Then '25' would be 19,200 baud > and '12' would be 38,400 baud > > Need to test this but could be a way to get more data out. > > Stanley > > ___ > 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] Pictic II mods
Time-Nuts, Thanks for your interest in checking out the PICTIC II and working together to simplify ordering the boards and parts. My hope is by making the code available others will find ways to improve on the basic design and will share their modifications to make this a better project. As Stanley and Bob have mentioned the baud rate can be modified in the code and I have had good success at serial rates up to 57.6K even though the internal PIC 8M osc is used. Many users will want to use an external timebase so 10M was selected as the default, but the timebase rate can be increased for greater resolution with appropriate selection of the sample capacitor values and XO rate during construction as desired. The board was designed so either a half or full can XO can be used and for top adjust trimmers with either staggered or in-line center pins for flexibility. The PICTIC II was a spin-off of a 1ns front-end for a GPSDO controller and is not intended to replace a good commercial time interval counter. But it is a simple TIC that could be useful in many amateur applications. The accuracy will depend on the timebase and interpolation gain used, with faster timebase rates and lower interpolation gains increasing the accuracy. Since commercial TIC designs use a fixed gain and the PICTIC II interpolation gain is variable, you can decide the best compromize between resolution and accuracy for your application. This flexibility makes it difficult to publish any meaningful specifications for the PICTIC II other than to say the interpolators with both doubler stages installed will provide a hardware gain of 800 when properly adjusted. The software gain can then be reduced to say 100 so an 8 count variation in the interpolation hardware is reduced to a single count variance in the combined 1ns TIC data for improved accuracy. Richard > Looking at Richard's code in PICTICII.ASM : > > bsf TXSTA,BRGH ;set USART hi speed mode > movlw D'51' ;set async rate at 9600 baud (51. for 8 > MHz int, BRGH=1) > movwf SPBRG > > Then '25' would be 19,200 baud > and '12' would be 38,400 baud > > Need to test this but could be a way to get more data out. > > Stanley > > ___ > 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 mods
yes, internal clock, may need to tune the osc or try +- one number, external osc pins are in use. Stanley - Original Message From: Bob Camp To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 4:11:11 PM Subject: Re: [time-nuts] Pictic II mods Hi I believe he's using the internal clock on the PIC. It's not super accurate, so running a lot of data can be an issue. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 3:41 PM To: time-nuts@febo.com Subject: [time-nuts] Pictic II mods Looking at Richard's code in PICTICII.ASM : bsf TXSTA,BRGH ;set USART hi speed mode movlw D'51' ;set async rate at 9600 baud (51. for 8 MHz int, BRGH=1) movwf SPBRG Then '25' would be 19,200 baud and '12' would be 38,400 baud Need to test this but could be a way to get more data out. Stanley ___ 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] Pictic II mods
Hi I believe he's using the internal clock on the PIC. It's not super accurate, so running a lot of data can be an issue. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stanley Reynolds Sent: Friday, July 02, 2010 3:41 PM To: time-nuts@febo.com Subject: [time-nuts] Pictic II mods Looking at Richard's code in PICTICII.ASM : bsf TXSTA,BRGH ;set USART hi speed mode movlw D'51' ;set async rate at 9600 baud (51. for 8 MHz int, BRGH=1) movwf SPBRG Then '25' would be 19,200 baud and '12' would be 38,400 baud Need to test this but could be a way to get more data out. Stanley ___ 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] Pictic II mods
Looking at Richard's code in PICTICII.ASM : bsf TXSTA,BRGH ;set USART hi speed mode movlw D'51' ;set async rate at 9600 baud (51. for 8 MHz int, BRGH=1) movwf SPBRG Then '25' would be 19,200 baud and '12' would be 38,400 baud Need to test this but could be a way to get more data out. Stanley ___ 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
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 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 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.
Re: [time-nuts] Pic programing for the PICTIC II
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 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.
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 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.
Re: [time-nuts] PICTIC II PCB order placed
Best source of info is : http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic A simple time interval counter to connect at a PC serial port. Sort of a experimenter's way to understand how the instrument works without too much complexity. Stanley - Original Message From: Richard W. Solomon To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 12:44:48 PM Subject: Re: [time-nuts] PICTIC II PCB order placed All this talk about the PICTIC has aroused my curiosity ... I missed the beginning of the thread, what is it for ? I may want on the wagon too !! 73, Dick, W1KSZ -Original Message- >From: Stanley Reynolds >Sent: Jul 2, 2010 9:46 AM >To: Discussion of precise time and frequency measurement >Subject: [time-nuts] PICTIC II PCB order placed > >Oops, I didn't know this was on the list been getting a lot of off list stuff. > >Some of my own emails to the list get lost before they get to me, others are >delayed this is a on going problem probably a yahoo spam filter overload. > >UPDATE on order: > >I have placed the order for more boards than needed and hope to receive them >in >less than 2 weeks. > >As far as shipping think it will be easy for me if we call it 1 USD per board. >I > >will let everyone gage when they need to mail their US funds check/money >order. >If you are paying by paypal add 50 cents per board for a total of 9.50. No >need >for payment till I receive the boards unless you are unsure how long it will >take for me to receive it. > >Stanley Reynolds >225 Alpine Street >Birmingham, AL 35210 >USA > >If your software will only work with Irondale and not Birmingham this is OK > >Stanley Reynolds >225 Alpine Street >Irondale, AL 35210 >USA > >paypal stanley_reyno...@yahoo.com > > > > > > > >- Original Message >From: Bob Bownes >To: Discussion of precise time and frequency measurement >Sent: Fri, July 2, 2010 10:45:36 AM >Subject: Re: [time-nuts] Pic programing for the PICTIC II > >Ok. I think there are a few of us who can/would program these up for >folks who need one. > > >On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds > wrote: >> Thank you but I have all I want to do with the boards later I may change my >> mind. >> >> Stanley >> > > >___ >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] PICTIC II PCB order placed
All this talk about the PICTIC has aroused my curiosity ... I missed the beginning of the thread, what is it for ? I may want on the wagon too !! 73, Dick, W1KSZ -Original Message- >From: Stanley Reynolds >Sent: Jul 2, 2010 9:46 AM >To: Discussion of precise time and frequency measurement >Subject: [time-nuts] PICTIC II PCB order placed > >Oops, I didn't know this was on the list been getting a lot of off list stuff. > >Some of my own emails to the list get lost before they get to me, others are >delayed this is a on going problem probably a yahoo spam filter overload. > >UPDATE on order: > >I have placed the order for more boards than needed and hope to receive them >in >less than 2 weeks. > >As far as shipping think it will be easy for me if we call it 1 USD per board. >I >will let everyone gage when they need to mail their US funds check/money >order. >If you are paying by paypal add 50 cents per board for a total of 9.50. No >need >for payment till I receive the boards unless you are unsure how long it will >take for me to receive it. > >Stanley Reynolds >225 Alpine Street >Birmingham, AL 35210 >USA > >If your software will only work with Irondale and not Birmingham this is OK > >Stanley Reynolds >225 Alpine Street >Irondale, AL 35210 >USA > >paypal stanley_reyno...@yahoo.com > > > > > > > >- Original Message >From: Bob Bownes >To: Discussion of precise time and frequency measurement >Sent: Fri, July 2, 2010 10:45:36 AM >Subject: Re: [time-nuts] Pic programing for the PICTIC II > >Ok. I think there are a few of us who can/would program these up for >folks who need one. > > >On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds > wrote: >> Thank you but I have all I want to do with the boards later I may change my >> mind. >> >> Stanley >> > > >___ >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
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.
Re: [time-nuts] Pic programing for the PICTIC II
On 2 July 2010 16:37, Stanley Reynolds wrote: > > 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. > > 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. > > __ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > __ > ___ 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
Stanley, I also want one board. I would like also a group buy of all parts, but I recognize that it is a lot of work to do for the person taking charge of it.. I can program the PICs for anyone in EU who needs it. But I think it is better to offer a very simple programmer schematic that can be assembled in a perforated board or even a breadboard for programming those PICs in house and saving the shipping charges. Ask me if anyone is interested. Regards Ignacio, EB4APL ___ 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
yes thats what I was thinking it depends on how many but I can program I do not want to get tangled in shipping and all of that. On Fri, Jul 2, 2010 at 11:45 AM, Bob Bownes wrote: > Ok. I think there are a few of us who can/would program these up for > folks who need one. > > > On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds > wrote: > > Thank you but I have all I want to do with the boards later I may change > my > > mind. > > > > Stanley > > > > > > > > - Original Message > > From: Chuck Harris > > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > > Sent: Fri, July 2, 2010 10:30:25 AM > > Subject: Re: [time-nuts] Pic programing for the PICTIC II > > > > I'm not too excited about all of the individualshipping, but if you can > tell me > > how many you want, I could buy them, program them, and ship them to you > to be > > distributed with the boards. > > > > -Chuck Harris > > > > Stanley Reynolds wrote: > >> I see some< $20 programmers on the auction site. Goggle turns up many > designs > >> with the warning that your PC serial port needs 11 to 12 volts. Did see > a > >>design > >> that used a external power supply. A zif socket maybe over kill if you > are > > only > >> using it once. > >> > >> > >> Any volunteers to supply preprogrammed 16f688 chips ? As we cover the > world > >> shipping could be a big factor so more than one volunteer would be > great. > >> > >> > >> > >> FAQ about PICTIC II > >> > >> My only connection to this project is to supply circuit boards at cost. > > Richard > >> has done all the hard work. > >> > >> Developed by Richard H McCorkle see wiki site : > >> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic > >> > >> No smd parts, standard through the hole parts and dip ic chips. > >> > >> > >> > >> programmer links: > >> > >> http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html > >> > >> http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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. > > > > ___ > 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] PICTIC II PCB order placed
Oops, I didn't know this was on the list been getting a lot of off list stuff. Some of my own emails to the list get lost before they get to me, others are delayed this is a on going problem probably a yahoo spam filter overload. UPDATE on order: I have placed the order for more boards than needed and hope to receive them in less than 2 weeks. As far as shipping think it will be easy for me if we call it 1 USD per board. I will let everyone gage when they need to mail their US funds check/money order. If you are paying by paypal add 50 cents per board for a total of 9.50. No need for payment till I receive the boards unless you are unsure how long it will take for me to receive it. Stanley Reynolds 225 Alpine Street Birmingham, AL 35210 USA If your software will only work with Irondale and not Birmingham this is OK Stanley Reynolds 225 Alpine Street Irondale, AL 35210 USA paypal stanley_reyno...@yahoo.com - Original Message From: Bob Bownes To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:45:36 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II Ok. I think there are a few of us who can/would program these up for folks who need one. On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds wrote: > Thank you but I have all I want to do with the boards later I may change my > mind. > > Stanley > ___ 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
Ok. I think there are a few of us who can/would program these up for folks who need one. On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds wrote: > Thank you but I have all I want to do with the boards later I may change my > mind. > > Stanley > > > > - Original Message > From: Chuck Harris > To: Discussion of precise time and frequency measurement > Sent: Fri, July 2, 2010 10:30:25 AM > Subject: Re: [time-nuts] Pic programing for the PICTIC II > > I'm not too excited about all of the individualshipping, but if you can tell > me > how many you want, I could buy them, program them, and ship them to you to be > distributed with the boards. > > -Chuck Harris > > Stanley Reynolds wrote: >> I see some< $20 programmers on the auction site. Goggle turns up many >> designs >> with the warning that your PC serial port needs 11 to 12 volts. Did see a >>design >> that used a external power supply. A zif socket maybe over kill if you are > only >> using it once. >> >> >> Any volunteers to supply preprogrammed 16f688 chips ? As we cover the world >> shipping could be a big factor so more than one volunteer would be great. >> >> >> >> FAQ about PICTIC II >> >> My only connection to this project is to supply circuit boards at cost. > Richard >> has done all the hard work. >> >> Developed by Richard H McCorkle see wiki site : >> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic >> >> No smd parts, standard through the hole parts and dip ic chips. >> >> >> >> programmer links: >> >> http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html >> >> http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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. > ___ 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
Thank you but I have all I want to do with the boards later I may change my mind. Stanley - Original Message From: Chuck Harris To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:30:25 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II I'm not too excited about all of the individualshipping, but if you can tell me how many you want, I could buy them, program them, and ship them to you to be distributed with the boards. -Chuck Harris Stanley Reynolds wrote: > I see some< $20 programmers on the auction site. Goggle turns up many designs > with the warning that your PC serial port needs 11 to 12 volts. Did see a >design > that used a external power supply. A zif socket maybe over kill if you are only > using it once. > > > Any volunteers to supply preprogrammed 16f688 chips ? As we cover the world > shipping could be a big factor so more than one volunteer would be great. > > > > FAQ about PICTIC II > > My only connection to this project is to supply circuit boards at cost. Richard > has done all the hard work. > > Developed by Richard H McCorkle see wiki site : > http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic > > No smd parts, standard through the hole parts and dip ic chips. > > > > programmer links: > > http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html > > http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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] Pic programing for the PICTIC II
- Original Message From: paul swed To: Discussion of precise time and frequency measurement Sent: Fri, July 2, 2010 10:27:26 AM Subject: Re: [time-nuts] Pic programing for the PICTIC II Whats your board count so far?? 23 people my guess is 40-50 boards 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. 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] Pic programing for the PICTIC II
I'm not too excited about all of the individualshipping, but if you can tell me how many you want, I could buy them, program them, and ship them to you to be distributed with the boards. -Chuck Harris Stanley Reynolds wrote: I see some< $20 programmers on the auction site. Goggle turns up many designs with the warning that your PC serial port needs 11 to 12 volts. Did see a design that used a external power supply. A zif socket maybe over kill if you are only using it once. Any volunteers to supply preprogrammed 16f688 chips ? As we cover the world shipping could be a big factor so more than one volunteer would be great. FAQ about PICTIC II My only connection to this project is to supply circuit boards at cost. Richard has done all the hard work. Developed by Richard H McCorkle see wiki site : http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic No smd parts, standard through the hole parts and dip ic chips. programmer links: http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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] Pic programing for the PICTIC II
Whats your board count so far?? Better ? How many16f688s are we talking here? Thanks On Fri, Jul 2, 2010 at 10:55 AM, Stanley Reynolds < stanley_reyno...@yahoo.com> wrote: > I see some < $20 programmers on the auction site. Goggle turns up many > designs > with the warning that your PC serial port needs 11 to 12 volts. Did see a > design > that used a external power supply. A zif socket maybe over kill if you are > only > using it once. > > > Any volunteers to supply preprogrammed 16f688 chips ? As we cover the world > shipping could be a big factor so more than one volunteer would be great. > > > > FAQ about PICTIC II > > My only connection to this project is to supply circuit boards at cost. > Richard > has done all the hard work. > > Developed by Richard H McCorkle see wiki site : > http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic > > No smd parts, standard through the hole parts and dip ic chips. > > > > programmer links: > > http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html > > http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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.
[time-nuts] Pic programing for the PICTIC II
I see some < $20 programmers on the auction site. Goggle turns up many designs with the warning that your PC serial port needs 11 to 12 volts. Did see a design that used a external power supply. A zif socket maybe over kill if you are only using it once. Any volunteers to supply preprogrammed 16f688 chips ? As we cover the world shipping could be a big factor so more than one volunteer would be great. FAQ about PICTIC II My only connection to this project is to supply circuit boards at cost. Richard has done all the hard work. Developed by Richard H McCorkle see wiki site : http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic No smd parts, standard through the hole parts and dip ic chips. programmer links: http://www.kmitl.ac.th/~kswichit/IspPgm30a/ISP-Pgm30a.html http://webs.uolsinectis.com.ar/nancy/pic/pic_en.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] Long period variation of GPS PPS timing?
The GPS16 is not a timing grade GPS and only claims 1uS on the 1PPS. Given this, I think 0.5uS jitter and +/- 1.4uS wander is not bad. cheers, ian http://www8.garmin.com/products/gps16/spec.html > > Message: 1 > Date: Thu, 01 Jul 2010 10:15:16 + > From: Paul Nicholson > Subject: [time-nuts] Long period variation of GPS PPS timing? > To: time-nuts@febo.com > Message-ID: <4c2c6ab4.9030...@abelian.org> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > I am using the PPS from a Garmin GPS16 to timestamp a VLF > signal received directly via a PC soundcard. Signal into one > channel, PPS into the other. > > Using pulse centroid timing, I'm seeing about 0.5uS jitter of > the pulse-to-pulse interval, and an exponential moving average > with time constant 100 seconds is applied to smooth this out. > > What I have left is a slow cyclic variation of the signal > timestamping. > > It shows up when I measure the phase of an off-air signal, > eg here is MSF 60kHz from Anthorn. > > http://abelian.org/vlf/live/pp100701msfb.png > > The same variation appears (in unison) on other off-air timing > signals, eg DCF and HBG both show the same cycle, so I guess > this is variation of the GPS PPS itself, not the VLF signal phase. > > The period is about 3000 seconds and the amplitude corresponds > to about +/- 1.4uS. > > Having no prior experience of using GPS PPS timing, I was > expecting some pulse-to-pulse jitter, but this slow variation > has caught me by surprise. Question: is this typical of GPS > timing signals, or have I got a problem in my software? > -- > Paul Nicholson > http://abelian.org > -- _ Browse profiles for FREE! Meet local singles online. http://clk.atdmt.com/NMN/go/150855801/direct/01/ ___ 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] Long period variation of GPS PPS timing?
Hi For the $50 to $100 cost it's tough to beat a Thunderbolt. It's overkill for the application, but easy to find. Bob On Jul 2, 2010, at 6:45 AM, Paul Nicholson wrote: > David Partridge wrote: > > Is this a timing GPS receiver, or a generic fast start > > navigation receiver? > > Just an ordinary nav GPS, Garmin model GPS16HVS intended > I think for marine/vehicle applications. Spec says cold > boot 45 seconds, warm boot (position unchanged) 38 seconds. > Measured warm boot is about 25 seconds. > > I haven't sent any setup commands to the thing, it is just > running with out-of-the-box defaults. > > The 1PPS is specified at +/-1uS accuracy, which is fine for > this application if the error averaged to zero (which it > probably does) and was randomly distributed (which it > appears not to be). > > My target for VLF phase error is +/- a few degrees at 77.5kHz, > ie about +/- 0.1uS accuracy, and naively I thought I could > reach this by a moving average of 100 seconds to smooth out > the quoted 1uS jitter of the PPS. But that assumes random > jitter! > > But this 50 minute cycle of about +/- 1.5uS is a bit of a > show stopper. Pity, the GPS16 is a nice unit in every > other respect. > > I'm trying to avoid using any specialised, hard to obtain, > GPS. Will have to order some other types and hope they > have different, better behaved, chip sets. Recommendations > welcome. > -- > Paul Nicholson > http://abelian.org > -- > > ___ > 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] Long period variation of GPS PPS timing?
David Partridge wrote: > Is this a timing GPS receiver, or a generic fast start > navigation receiver? Just an ordinary nav GPS, Garmin model GPS16HVS intended I think for marine/vehicle applications. Spec says cold boot 45 seconds, warm boot (position unchanged) 38 seconds. Measured warm boot is about 25 seconds. I haven't sent any setup commands to the thing, it is just running with out-of-the-box defaults. The 1PPS is specified at +/-1uS accuracy, which is fine for this application if the error averaged to zero (which it probably does) and was randomly distributed (which it appears not to be). My target for VLF phase error is +/- a few degrees at 77.5kHz, ie about +/- 0.1uS accuracy, and naively I thought I could reach this by a moving average of 100 seconds to smooth out the quoted 1uS jitter of the PPS. But that assumes random jitter! But this 50 minute cycle of about +/- 1.5uS is a bit of a show stopper. Pity, the GPS16 is a nice unit in every other respect. I'm trying to avoid using any specialised, hard to obtain, GPS. Will have to order some other types and hope they have different, better behaved, chip sets. Recommendations welcome. -- Paul Nicholson http://abelian.org -- ___ 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] Long period variation of GPS PPS timing?
Is this a timing GPS receiver, or a generic fast start navigation receiver? 25 seconds to start from power on sounds rather short for a timing receiver. The T-bolt start up from cold takes about 15 minutes for the crystal oven to warm, then the self survey is run which by default is 2000 samples (just over 33 minutes). Once the survey is complete, the position is stored and the receiver runs in "over-determined" clock mode. I can't remember the "warm start" time but 25 seconds sounds on the short side. Refer back to Mark Sims tests on the benefits of taking a 48 hour self survey to get a more accurate position (ISTR there was a cyclic error associated with an incorrect position). Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Paul Nicholson Sent: 02 July 2010 09:05 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Long period variation of GPS PPS timing? This morning I waited for the VLF timing signals to settle into their steady daytime phase - still showing the slow cycle of phase variation. Then I power-cycled the GPS, leaving everything else running. During the 25 seconds it takes the GPS to begin sending PPS again, my software continues to time the VLF signal using the average PPS pulse interval measured over the previous 100 or so seconds. See the phase plot of DCF 77.5kHz for the result, http://abelian.org/vlf/live/pp100702dcfa.png GPS rebooted at 16686 seconds, just after the slow cycle started its upward ramp. It seems to have caused a phase jump in the slow cycle - it switched to starting a downward ramp. To confirm, I rebooted the GPS again at 24915 seconds, as it was about half way down a downward ramp. Again a step change of phase, this time it restarted at the bottom of an upward ramp. Just to eliminate any effect in my software, I unplugged the PPS signal from the soundcard for 30 seconds, leaving the GPS running. My software is starved of PPS for the same length of time as during the GPS reboots. This occurred at 27440 seconds, halfway along a downward ramp. The ramp continued down. Just to 'shake the bag' of temperature effects, I opened the door of the cabinet containing the PCs and electronics, this quickly dropped the temperature by 10 C. Also took out the unit containing the RC pulse forming, took its lid off and left it in the open air. Result: no noticeable change to the slow cycle. Well now, this sure looks to me like a GPS effect. I think I'd better order another GPS, a different type, maybe a GlobalSat MR-350P, or something, for comparison. Recommendations? Will also try to move the GPS16 so that it can see more of the sky - only about 50% visible at the moment, some trees block the other half. -- Paul Nicholson http://abelian.org -- ___ 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] Motion effects on accuracy of GPS pps
Thanks for all the responses. I've also had a response from uBlox support informing me that the TimePulse accuracy will degrade (both due to motion and of course due to multipath, weak signals etc. - datasheet accuracy figures are for reasonable/optimal conditions). The uBlox module has a T Accuracy filter which can impose a limit on the estimated accuracy of the PPS. When the limit is exceeded it will stop the PPS. The T accuracy estimate is also accessible in navigation strings, which is what I'm now going to monitor. The T Accuracy filter takes more into consideration than does TDOP - the accuracy estimate includes detected multi-path, weak signals as well as the standard factors that TDOP is based on. The one question I've yet to resolve is whether or not motion can cause sustained increase or decrease in the period of the pulses and not just increased jitter. Daniel Magnus Danielson wrote: On 06/29/2010 10:32 AM, b...@lysator.liu.se wrote: Hi Daniel, Hi, I've recently completed a GPSDO using the pps output of a uBlox Antaris TIM4 GPS module to discipline a 10MHz OCXO. I'm now investigating the motion effects (acceleration/uniform velocity) on the accuracy of the time-pulse and hence on my frequency output. Are you moving around in areas with little obstruction for the GPS antenna towards the sky? Then I would first look at the dynamics inpact on your OCXO. I've been unable to find any detailed information on the relationship between the accuracy of the pps output and the effects of having the receiver in motion (i.e. in a car/boat, at velocities far below the modules operating limit of 515m/s) - I'd appreciate some input on this matter. Does motion cause increased jitter? Tilting/accelerating your GPS oscillator might possibly yield an effect. Other than that there is no theoretical advantage keeping your receiver stationary. All its measurements are done against satellites moving at ca 4km/s. I disagree... for some receivers... As you line up you pseudo-ranges you now have to solve only the T variable rather than the XYZT position. This means that all pseudo-ranges is available for solving the T solution and reducing the TDOP error. The T-RAIM is also able to drop more false-tickers. For receivers not having a T mode only but normal 3D or 2D mode, the benefit of fixed location is of less concern. So, for a receiver at a fixed location knowing it has a fixed location it may be a benefit. Cheers, Magnus -- Daniel Davson HW Design Engineer Peralex Electronics (pty) ltd. Peralex House, 5 Dreyersdal Rd, Bergvliet 7945, South Africa Tel: +27 21 710 7446 Disclaimer: http://www.peralex.com/disclaimer.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] Long period variation of GPS PPS timing?
This morning I waited for the VLF timing signals to settle into their steady daytime phase - still showing the slow cycle of phase variation. Then I power-cycled the GPS, leaving everything else running. During the 25 seconds it takes the GPS to begin sending PPS again, my software continues to time the VLF signal using the average PPS pulse interval measured over the previous 100 or so seconds. See the phase plot of DCF 77.5kHz for the result, http://abelian.org/vlf/live/pp100702dcfa.png GPS rebooted at 16686 seconds, just after the slow cycle started its upward ramp. It seems to have caused a phase jump in the slow cycle - it switched to starting a downward ramp. To confirm, I rebooted the GPS again at 24915 seconds, as it was about half way down a downward ramp. Again a step change of phase, this time it restarted at the bottom of an upward ramp. Just to eliminate any effect in my software, I unplugged the PPS signal from the soundcard for 30 seconds, leaving the GPS running. My software is starved of PPS for the same length of time as during the GPS reboots. This occurred at 27440 seconds, halfway along a downward ramp. The ramp continued down. Just to 'shake the bag' of temperature effects, I opened the door of the cabinet containing the PCs and electronics, this quickly dropped the temperature by 10 C. Also took out the unit containing the RC pulse forming, took its lid off and left it in the open air. Result: no noticeable change to the slow cycle. Well now, this sure looks to me like a GPS effect. I think I'd better order another GPS, a different type, maybe a GlobalSat MR-350P, or something, for comparison. Recommendations? Will also try to move the GPS16 so that it can see more of the sky - only about 50% visible at the moment, some trees block the other half. -- Paul Nicholson http://abelian.org -- ___ 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.
