Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Be very careful of using the same sensor to control your loop and to determine how well the device is holding temperature. It's amazingly easy to fool yourself by a couple of orders of magnitude…. The test is always to have a couple of other sensors located around the device and see what happens to them. That said, the real fun is to see how much thermal gain the loop has. If the outside temperature changes 100 C how much does your LPRO change? A 1 C change would be a thermal gain of 100X. Practical single stage controllers can get you into the 300 to 500 range. If your room ambient changes by 4C, the device should change by 0.04 C with a thermal gain of 100. Bob On Sep 12, 2013, at 8:52 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Guido, A couple more questions about the RFTG if you have a moment: What are you default values for Avg Sample, Time Corr Schedule, and Freq Corr Schedule. Mine are 5, 15, 1440... Also with yours up and running how often does it make adjustments? Mine has been running for 82 hours and has made no time adjustments and the three frequency adjustments (every 24 hours) are for 0.e+000. It would seem that it is pretty happy with where it is as all of my previous times were loaded with both time and frequency adjustments in an attempt to get itself set properly. Perhaps it finally did. I've attached a temperature sensor to the LPRO inside and am using a PID loop on an AVR to vary a fan rpm to keep the LPRO at a consistent temp. It seems to be keeping it at +/- 0.2 deg C and I've not bothered to try to tune the PID at all yet. Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 23, 2013 1:25 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, A couple more questions about the RFTG if you have a moment: What are you default values for Avg Sample, Time Corr Schedule, and Freq Corr Schedule. Mine are 5, 15, 1440... Also with yours up and running how often does it make adjustments? Mine has been running for 82 hours and has made no time adjustments and the three frequency adjustments (every 24 hours) are for 0.e+000. It would seem that it is pretty happy with where it is as all of my previous times were loaded with both time and frequency adjustments in an attempt to get itself set properly. Perhaps it finally did. I've attached a temperature sensor to the LPRO inside and am using a PID loop on an AVR to vary a fan rpm to keep the LPRO at a consistent temp. It seems to be keeping it at +/- 0.2 deg C and I've not bothered to try to tune the PID at all yet. Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 23, 2013 1:25 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Bob, I've got one of these: MCP9701A-E/TO-ND: http://www.digikey.com/product-search/en?x=0y=0lang=ensite=usKeyWords=MC P9701A-E%2FTO-ND Mounted to the connector side of the LPRO. I made a small aluminum bracket that fits under the hex head connector screws and clamps the TO92 to the LPRO case. It isn't at the physics end or taking the temperature of the base plate, but I am hoping that it will do. It outputs a voltage 400 mV = 0 deg C + 19.5 mV per deg C. I've got it feeding into an ADC channel on an AVR with a precision 2.5V reference. I've not calibrated it, but my ir temp sensor agrees pretty close to it, but calibration to a specific temp really isn't my goal, keeping the LRPO at the same temperature as much as possible is. Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Thursday, September 12, 2013 8:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Be very careful of using the same sensor to control your loop and to determine how well the device is holding temperature. It's amazingly easy to fool yourself by a couple of orders of magnitude . The test is always to have a couple of other sensors located around the device and see what happens to them. That said, the real fun is to see how much thermal gain the loop has. If the outside temperature changes 100 C how much does your LPRO change? A 1 C change would be a thermal gain of 100X. Practical single stage controllers can get you into the 300 to 500 range. If your room ambient changes by 4C, the device should change by 0.04 C with a thermal gain of 100. Bob On Sep 12, 2013, at 8:52 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Guido, A couple more questions about the RFTG if you have a moment: What are you default values for Avg Sample, Time Corr Schedule, and Freq Corr Schedule. Mine are 5, 15, 1440... Also with yours up and running how often does it make adjustments? Mine has been running for 82 hours and has made no time adjustments and the three frequency adjustments (every 24 hours) are for 0.e+000. It would seem that it is pretty happy with where it is as all of my previous times were loaded with both time and frequency adjustments in an attempt to get itself set properly. Perhaps it finally did. I've attached a temperature sensor to the LPRO inside and am using a PID loop on an AVR to vary a fan rpm to keep the LPRO at a consistent temp. It seems to be keeping it at +/- 0.2 deg C and I've not bothered to try to tune the PID at all yet. Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 23, 2013 1:25 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
It can't be a coincidence that it is exactly 7*rollover. Le 23 août 2013 à 17:57, Alan Kamrowski II a écrit : Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido and mc235960, It stopped doing it all of a sudden and is now accepting the date properly. I did numerous CPU resets on it and one power down/power up and it still did it. Telling the unit the date was old (1/1/1994) took fine so I kept increasing the year 1999, 2000, 2005, 2015 and finally back to 2013 and it stayed ok. The Motorola @@ea command doesn't have the GPS week in it so I'm not sure how the unit got where it was, but it does seem related to that somehow. I did try to send it 2050 to see how far it would go because the Motorola spec ends at 2017. Perhaps this triggered a fix gps date function in eeprom that added to the date to try to correct for the number of week rollover issue? Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 23, 2013 1:25 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi According to the guys at Lucent, there were numerous fixes / updates / enhancements of the code in the GPS cards they used. The number they tossed out was hundreds. I suspect that was an exaggeration. Even if it was only dozens there likely are a number of different code images in the cards, each with it's own issues. Bob On Aug 23, 2013, at 2:38 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Guido and mc235960, It stopped doing it all of a sudden and is now accepting the date properly. I did numerous CPU resets on it and one power down/power up and it still did it. Telling the unit the date was old (1/1/1994) took fine so I kept increasing the year 1999, 2000, 2005, 2015 and finally back to 2013 and it stayed ok. The Motorola @@ea command doesn't have the GPS week in it so I'm not sure how the unit got where it was, but it does seem related to that somehow. I did try to send it 2050 to see how far it would go because the Motorola spec ends at 2017. Perhaps this triggered a fix gps date function in eeprom that added to the date to try to correct for the number of week rollover issue? Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 23, 2013 1:25 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Alan, I haven't seen this behaviour yet, but then I have RFTG shut off for a couple of months since. 7168 is dividible by 7 and the result is 1024. You know the gps week wraps over from 1023 (0x3ff) to 0. Perhaps what you see is the consequence of some software workaround of this problem, in other words the RFTG thinks a gps week rollover must have happened and tries to correct the date. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Do you have any idea why the unit interprets the date 7168 (0x1c00) days into the future? If I send it today's date in the correct Motorola format, this is how many days it adds to it. If I change the date to try another, it does the same thing. Any idea why? I can correct for it by subtracting 0x1c00 days before sending it, this just seems very odd. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Am Samstag, den 17.08.2013, 23:05 -0500 schrieb Alan Kamrowski II:
Alan,
sent you the file by private mail. Note that serial data on this input
of the RFTG has to be ttl-level.
Have fun
Guido
Hi Guido,
yes it worked. I'll have to look through my software projects and send you
the source file.
Please do, so far my attempt is just failing.
I'm trying to send:
//transmit gps data
txserial_putc('@');
txserial_putc('@');
checksum=0;
checksum_putc('E');
checksum_putc('a');
checksum_putc(1); //month
checksum_putc(1); //day
checksum_putc(208); //year2 2000
checksum_putc(7);
checksum_putc(0); //h
checksum_putc(0); //m
checksum_putc(0); //s
checksum_putc(0); //frac40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //lat4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //long40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //elip40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //notused4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //vel20
checksum_putc(0);
checksum_putc(0); //heading20
checksum_putc(0);
checksum_putc(0); //dop20
checksum_putc(0);
checksum_putc(0); //doptype 0
checksum_putc(12); //vissats 12
checksum_putc(8); //trackedsats 8
checksum_putc(0); //satid 0
checksum_putc(6); //trackmode sat time available
checksum_putc(0); //carrnoise
checksum_putc(2); //status using for time solution
checksum_putc(1); //2
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(2); //3
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(3); //4
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(4); //5
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(5); //6
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(6); //7
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(7); //8
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(32); //receiverstat 3d fix
txserial_putc(checksum);
txserial_putc(13);
txserial_putc(10);
Thanks,
Alan
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Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Alan, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. once a second if I remember correctly. Note that the RFTG doesn't talk to the UT, it just listens, so you will need to initiate the messages somehow. There's also some windows diagnostic software for the RFTG on ko4bb's archive. Have fun Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, Been there, done that. The RFTGm-RB can be disciplined if you connect the pps and the gps data stream coming from a motorola Oncore. Regards Guido I've pulled it apart and the board does show a connection to the EXT C-FIELD. That trace runs to a jumper labeled A C B and currently C B is shunted. Any particular Motorola oncore model required - I see a bunch of them on Ebay... Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 16, 2013 3:29 AM To: Rex; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Von Samsung Mobile gesendet Rex r...@sonic.net hat geschrieben: I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. On 8/15/2013 7:52 AM, Alan Kamrowski II wrote: Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface %20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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 mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. So if I send the bytes: @@Ea.. it will accept the 1pps pulse? Any idea on the baud rate, 9600 N 8 1 ? Thanks for your help Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, I found a manual here: http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf I don't see the @@Ea.. sequence anywhere. Is it NMEA or SIRF Binary? Any more tips before I try this? Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Alan, sorry for my misleading comment. What I meant was the RFTG will need @@Ea messages coming from the UT. They contain the necessary gps data for the RFTG to accept the pps pulse. You initiate on the UT by sending it a @@Ea request. This has to be done for example y a PC running the motorola control software. Look it up in the UT manual. As I said the RFTG will just listen to incoming gps messages, because normally the RFTGm-Rb will run in tandem with an RFTGm-XO which takes care of talking to its inbuilt UT and passes the messages to the RFTGm-RB. What else? @@Ea messages should be configured to be sent once a second. The RFTG will need to receive at least one additional message stating that position data is valid and search mode has finished successfully. Again, look it up in the UT manual. I've found these things out by trial and error, sorry to be not more specific. 9600 8N1 will do nicely and is the default. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, the one I used was a Oncore UT. The message needed for the RFTG is @@Ea.. So if I send the bytes: @@Ea.. it will accept the 1pps pulse? Any idea on the baud rate, 9600 N 8 1 ? Thanks for your help Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Alan, wrong manual, the UT doesn't talk sirf as far as I remember. Although it can do NMEA this is not what want. Try to find a manual for the motorola Oncore receivers, the commands and messages I mentioned are specific to them. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, I found a manual here: http://www.elgps.com/public_ftp/Documentos/SIRF_Protocol.pdf I don't see the @@Ea.. sequence anywhere. Is it NMEA or SIRF Binary? Any more tips before I try this? Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. If you go shopping, go for one of the later cards. They work a lot better than the early ones. Bob On Aug 17, 2013, at 10:56 AM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Am Samstag, den 17.08.2013, 09:56 -0500 schrieb Alan Kamrowski II: Hi Guido, So you didn't fake the data from the UT, you only made something to ask the UT to output it. That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. I see some UT units on eBay, but I don't recognize the antenna connectors. I've got a small screw on antenna (SMA?), but the ones on eBay look like that small round push on like I've seen in notebook computers or something that looks like SMA, but doesn't seem to have threads - push on??? Does the UT require a specific antenna? As has already been pointed out, no special antenna is needed as long as it's happy with a 5V supply. I believe I used a connector from a wifi-module of a laptop computer to put together an adapter. Aren't these called smc-connectors and come in normal and reversed fashion? Have fun, Guido ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Bob, All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. Thanks, I'll look for one of these. If you go shopping, go for one of the later cards. They work a lot better than the early ones. I saw a couple on eBay, but don't know anything about them, which ones are the later ones? Thanks for your help! Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
You can find complete copies of the Motorola Oncoremanuals here: http://wa5rrn.com Click the GPS Information link, then the Oncore link. You want Chapter 6 for the data stream descriptions, but get them all. He has other interesting GPS related manuals, as well. Bob - AE6RV From: Alan Kamrowski II ala...@earthlink.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Saturday, August 17, 2013 1:37 PM Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Alan, yes it worked. I'll have to look through my software projects and send you the source file. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
HI On Aug 17, 2013, at 2:38 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Bob, All the UT cards that I have ever seen use the small push on antenna connector. I have never seen one that directly takes anything normal like an SMA or a BNC. You buy the card and then a bit of coax with the push on on one end and (normally) an SMA on the other end. The antenna for the UT is a normal 5V powered GPS antenna. Just about anything other than a +12V survey antenna will work. Thanks, I'll look for one of these. If you go shopping, go for one of the later cards. They work a lot better than the early ones. I saw a couple on eBay, but don't know anything about them, which ones are the later ones? You sort of have to know what you are looking at. The newer boards are based on an iLotus(?) chip set. The older boards are Motorola parts. Some of them are approaching 20 years old. The technology behind this stuff has improved over the years. Somebody else on the list may have a magic decoder ring / pictures to help figuring out the progression of parts over the years. Bob Thanks for your help! Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, yes it worked. I'll have to look through my software projects and send you the source file. That would be awesome - thank you for looking! Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Saturday, August 17, 2013 2:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Alan, yes it worked. I'll have to look through my software projects and send you the source file. Have fun, Guido Von Samsung Mobile gesendet Alan Kamrowski II ala...@earthlink.net hat geschrieben: Hi Guido, That´s exactly what I did, although I used the fake approach before that , when I didn't have a UT on hand. Was that successful? If I could just output the same data stream to it once a second with the pulse from an AVR or something that would be great. Do you still have this setup? Can you tell me what bytes are sent once per second so I can recreate sending them? Thanks so much, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido,
yes it worked. I'll have to look through my software projects and send you the
source file.
Please do, so far my attempt is just failing.
I'm trying to send:
//transmit gps data
txserial_putc('@');
txserial_putc('@');
checksum=0;
checksum_putc('E');
checksum_putc('a');
checksum_putc(1); //month
checksum_putc(1); //day
checksum_putc(208); //year2 2000
checksum_putc(7);
checksum_putc(0); //h
checksum_putc(0); //m
checksum_putc(0); //s
checksum_putc(0); //frac40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //lat4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //long40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //elip40
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //notused4 0
checksum_putc(0);
checksum_putc(0);
checksum_putc(0);
checksum_putc(0); //vel20
checksum_putc(0);
checksum_putc(0); //heading20
checksum_putc(0);
checksum_putc(0); //dop20
checksum_putc(0);
checksum_putc(0); //doptype 0
checksum_putc(12); //vissats 12
checksum_putc(8); //trackedsats 8
checksum_putc(0); //satid 0
checksum_putc(6); //trackmode sat time available
checksum_putc(0); //carrnoise
checksum_putc(2); //status using for time solution
checksum_putc(1); //2
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(2); //3
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(3); //4
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(4); //5
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(5); //6
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(6); //7
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(7); //8
checksum_putc(6);
checksum_putc(0);
checksum_putc(2);
checksum_putc(32); //receiverstat 3d fix
txserial_putc(checksum);
txserial_putc(13);
txserial_putc(10);
Thanks,
Alan
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Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?
Been there, done that. The RFTGm-RB can be disciplined if you connect the pps and the gps data stream coming from a motorola Oncore. Regards Guido Von Samsung Mobile gesendet Rex r...@sonic.net hat geschrieben: I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. On 8/15/2013 7:52 AM, Alan Kamrowski II wrote: Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface%20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Guido, Been there, done that. The RFTGm-RB can be disciplined if you connect the pps and the gps data stream coming from a motorola Oncore. Regards Guido I've pulled it apart and the board does show a connection to the EXT C-FIELD. That trace runs to a jumper labeled A C B and currently C B is shunted. Any particular Motorola oncore model required - I see a bunch of them on Ebay... Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Guido Küppers Sent: Friday, August 16, 2013 3:29 AM To: Rex; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Von Samsung Mobile gesendet Rex r...@sonic.net hat geschrieben: I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. On 8/15/2013 7:52 AM, Alan Kamrowski II wrote: Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface %20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface%20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I'm not sure of the model number, Lucent had several variations on the same theme in that time frame. I had one of the rubidiums that may be the same as yours. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. On 8/15/2013 7:52 AM, Alan Kamrowski II wrote: Hi Everyone, I've only got the RFTGm-II-Rb module. I found an interface cable specification here: http://www.ko4bb.com/Manuals/05%29_GPS_Timing/RFTG-m/RFTGm%20Interface%20Cab le.pdf Does anyone know if feeding a 1pps signal to pin 9 might discipline it? Or does it need the other connections such as GPS data, etc. Is there a ground on this connector? 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Rex, I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I was hoping since the rubidium module had a light for GPS and an input for the GPS that it also did the same thing. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. That is too bad, but that proves it all right. I tried to feed a 1pps signal into the interface pin 9 to see what would happen, but the NO GPS light never went off and it didn't pull the frequency at all. So far I've done a 4 hour run between the Rb and GPS and counted 13939010 Rb cycles to 13939 GPS 1pps pulses or 1000.0007174 Hz for the Rb. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi So your Rb is 0.71 ppb off frequency. That's far enough that's it's worth adjusting. You should be able to get it 10X better than that without a lot of work. Bob On Aug 15, 2013, at 6:02 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Rex, I don't think the rubidium module for these systems can be disciplined. I think they were only intended as a backup if the XO section or GPS failed. The XO section does discipline but I don't know the details. I was hoping since the rubidium module had a light for GPS and an input for the GPS that it also did the same thing. Trying to trace out some of the circuits, I found that the EFC on the LPRO connector was not being used at all. That is too bad, but that proves it all right. I tried to feed a 1pps signal into the interface pin 9 to see what would happen, but the NO GPS light never went off and it didn't pull the frequency at all. So far I've done a 4 hour run between the Rb and GPS and counted 13939010 Rb cycles to 13939 GPS 1pps pulses or 1000.0007174 Hz for the Rb. Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Bob, Is it 0.71 ppb off or 0.071 ppb off? This is how I calculated it: 13939010/13939 = 1000.000717411579022885429371 answer/1000 = 1.00717411579022885429371 answer-1 = 7.1741157902288542937083004519693e-11 answer*1e9 = 0.071741157902288542937083004519693 Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Bob, No biggie - just wanted to make sure I was calculating it right! :) Thanks, Alan -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Thursday, August 15, 2013 7:35 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module? Hi Must have blinked counting all the zeros .. Bob On Aug 15, 2013, at 6:36 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Bob, Is it 0.71 ppb off or 0.071 ppb off? This is how I calculated it: 13939010/13939 = 1000.000717411579022885429371 answer/1000 = 1.00717411579022885429371 answer-1 = 7.1741157902288542937083004519693e-11 answer*1e9 = 0.071741157902288542937083004519693 Thanks, Alan ___ time-nuts mailing 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] RFTGm-II-Rb - can you gps discipline it without the XO module?
Hi Must have blinked counting all the zeros …. Bob On Aug 15, 2013, at 6:36 PM, Alan Kamrowski II ala...@earthlink.net wrote: Hi Bob, Is it 0.71 ppb off or 0.071 ppb off? This is how I calculated it: 13939010/13939 = 1000.000717411579022885429371 answer/1000 = 1.00717411579022885429371 answer-1 = 7.1741157902288542937083004519693e-11 answer*1e9 = 0.071741157902288542937083004519693 Thanks, Alan ___ time-nuts mailing 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.
