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Discussion of precise time and frequency measurement

[No sat positions in LH with Trimble NTBW50AA? SOLVED!

Mark Sims

Sat, Jan 7, 2017 3:09 AM

If you have two clocks off by 18 seconds, one of them is running on GPS time and one is running on UTC.

Check the upper left hand corner of the screen to see if it says "UTC time OK" or "GPS time OK". If it says GPS, then the receiver is set to send GPS time. A lot of Trimble devices default to GPS time. Enter TU from the keyboard to switch the receiver to UTC time. The setting should be automatically saved to EEPROM. You can also use /tu from the command line. For receivers that do not support sending GPS time, Heather can fake it as long as the UTC leapsecond offset is available.

The /rxt command line option automatically selects /br=9600:8:N:1, so you don't need to set that unless you have configured the receiver for a non-standard baud rate. There were a bunch surplus of Res-T's shipped at 38400 baud.

The time zone command should be /tz=-5EST/EDT (or the equivalent Linux format /tz=EST5EDT). The time zone offset can be specified down to the second... /tz=-12:34:56ABC/DEF

If you are not in the US, you can specify your daylight savings time rule with the /b command line option. There are pre-defined rules for Europe, Australia, and New Zealand or you can specify a custom rule.

If you have two clocks off by 18 seconds, one of them is running on GPS time and one is running on UTC. Check the upper left hand corner of the screen to see if it says "UTC time OK" or "GPS time OK". If it says GPS, then the receiver is set to send GPS time. A lot of Trimble devices default to GPS time. Enter TU from the keyboard to switch the receiver to UTC time. The setting should be automatically saved to EEPROM. You can also use /tu from the command line. For receivers that do not support sending GPS time, Heather can fake it as long as the UTC leapsecond offset is available. The /rxt command line option automatically selects /br=9600:8:N:1, so you don't need to set that unless you have configured the receiver for a non-standard baud rate. There were a bunch surplus of Res-T's shipped at 38400 baud. The time zone command should be /tz=-5EST/EDT (or the equivalent Linux format /tz=EST5EDT). The time zone offset can be specified down to the second... /tz=-12:34:56ABC/DEF If you are not in the US, you can specify your daylight savings time rule with the /b command line option. There are pre-defined rules for Europe, Australia, and New Zealand or you can specify a custom rule.

Brad Dye

Wed, Jan 25, 2017 7:11 PM

For some unknown reason I am not receiving time or sat location info. LH does appear to be talking to the Thunderbolt since some of the info is in white letters. I have tried lots of commands with no joy. Computer is the same laptop I have always used running Win. 7.

I have tried a second Thunderbolt and a second antenna — still no luck — since it looked like the GPS receiver portion of the GPSDO isn’t working.

Does anyone have any suggestions to help out an “OM” with emphasis on the “O.”

Here is my setup: http://www.braddye.com/gps_do.html

Brad Dye, K9IQY
ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4
60 years as a licensed amateur radio operator
43 years since licensed as a First Class Commercial radio operator/engineer

Gents: I really enjoy reading the postings from this group. It’s like going back to school sometimes. I am a longtime user of Lady Heather with a Trimble Thunderbolt and recently updated the program to V5.00. For some unknown reason I am not receiving time or sat location info. LH does appear to be talking to the Thunderbolt since some of the info is in white letters. I have tried lots of commands with no joy. Computer is the same laptop I have always used running Win. 7. I have tried a second Thunderbolt and a second antenna — still no luck — since it looked like the GPS receiver portion of the GPSDO isn’t working. Does anyone have any suggestions to help out an “OM” with emphasis on the “O.” Here is my setup: http://www.braddye.com/gps_do.html 73 Brad Dye, K9IQY ex KN9IQY, KN4BK, KM5NK, WB4JCF, ZP5TQ, WA4VXU, WA9RVL, HH2FJ /TI2, /9Y4, /6Y5, /KP4 60 years as a licensed amateur radio operator 43 years since licensed as a First Class Commercial radio operator/engineer