Re: [time-nuts] GPS time module
Sorry if already posted: http://www.saelig.com/COMCR/COMCR002.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS time module
Sorry in advance guys, I could not resist doing a short comparison between our LC_XO module and this new Selig/RF-Suisse 1x1 module. Please excuse this blatantly biased comparison: The Selig module is slightly larger, and consumes about the same amount of power as the LC_XO (TCXO version), and basically provides a similar set of signals. It is however about twice as expensive, has an 8-week lead-time versus from-stock delivery, and there are other differences: * 20 channel GPS without WAAS/SBAS (Selig) versus 50 channels with WAAS/SBAS (LC_XO) * 1us time pulse accuracy (Selig) versus +/-25ns time pulse accuracy typ. (LC_XO) * Washing not approved (Selig) versus washing approved (LC_XO) * Selig requires an antenna cable to be plugged into the bottom of the PCB, then the module is soldered onto a customer PCB. Thus if the antenna cable becomes loose, it cannot be plugged back into the connector. LC_XO: antenna feed via the solder pins from carrier PCB * Selig I/O: Status LED and requirement to program for an I2C slave register, no NMEA or control command interface for GPSCon, GPSD, or Z38xx etc versus LC_XO: two NMEA outputs (RAW NMEA and Binary from uBlox GPS), JLT NMEA commands with custom commands, and SCPI control interface for third-party software * Selig 60,000 feet altitude limit versus 164,000 feet for LC_XO * Power requirement: Selig: 5V versus LC_XO 3.3V (LC_XO will provide 5V from internal DC switcher that can be used externally on carrier PCB) * Phase Noise: about the same between both units * ADEV: Selig slightly better at around 20s, LC_XO better above 1000s (LC_XO short-term ADEV can be significantly improved in stable environments by setting the time-constant of the loop to longer time frames) * Selig module options: GPS or no GPS versus LC_XO module options: TCXO, OCXO, and external 1PPS input with auto-switchover to internal GPS receiver * Firmware updates: Selig does not provide customer update mechanism versus LC_XO can be easily updated with various firmware versions available for customer download from the website without any website log-in etc. * Selig TCXO stability: +/-100ppb from -20C to +70C versus +/-75ppb from 0C to 60C or +/-25ppb from 0C to +60C (OCXO version) Selig/RF-Suisse offering this form factor is a welcome event as it validates the form factor in itself. I am however not seeing too many advantages for the Selig part in comparison especially at about twice the cost, am I missing something? bye, Said In a message dated 10/29/2013 14:54:51 Pacific Daylight Time, lstosk...@cox.net writes: Sorry if already posted: http://www.saelig.com/COMCR/COMCR002.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS time module
Thanks for the comparison Said. I am glad I have an LC_XO. ;) Regards, John Westmoreland On Tue, Oct 29, 2013 at 4:35 PM, saidj...@aol.com wrote: Sorry in advance guys, I could not resist doing a short comparison between our LC_XO module and this new Selig/RF-Suisse 1x1 module. Please excuse this blatantly biased comparison: The Selig module is slightly larger, and consumes about the same amount of power as the LC_XO (TCXO version), and basically provides a similar set of signals. It is however about twice as expensive, has an 8-week lead-time versus from-stock delivery, and there are other differences: * 20 channel GPS without WAAS/SBAS (Selig) versus 50 channels with WAAS/SBAS (LC_XO) * 1us time pulse accuracy (Selig) versus +/-25ns time pulse accuracy typ. (LC_XO) * Washing not approved (Selig) versus washing approved (LC_XO) * Selig requires an antenna cable to be plugged into the bottom of the PCB, then the module is soldered onto a customer PCB. Thus if the antenna cable becomes loose, it cannot be plugged back into the connector. LC_XO: antenna feed via the solder pins from carrier PCB * Selig I/O: Status LED and requirement to program for an I2C slave register, no NMEA or control command interface for GPSCon, GPSD, or Z38xx etc versus LC_XO: two NMEA outputs (RAW NMEA and Binary from uBlox GPS), JLT NMEA commands with custom commands, and SCPI control interface for third-party software * Selig 60,000 feet altitude limit versus 164,000 feet for LC_XO * Power requirement: Selig: 5V versus LC_XO 3.3V (LC_XO will provide 5V from internal DC switcher that can be used externally on carrier PCB) * Phase Noise: about the same between both units * ADEV: Selig slightly better at around 20s, LC_XO better above 1000s (LC_XO short-term ADEV can be significantly improved in stable environments by setting the time-constant of the loop to longer time frames) * Selig module options: GPS or no GPS versus LC_XO module options: TCXO, OCXO, and external 1PPS input with auto-switchover to internal GPS receiver * Firmware updates: Selig does not provide customer update mechanism versus LC_XO can be easily updated with various firmware versions available for customer download from the website without any website log-in etc. * Selig TCXO stability: +/-100ppb from -20C to +70C versus +/-75ppb from 0C to 60C or +/-25ppb from 0C to +60C (OCXO version) Selig/RF-Suisse offering this form factor is a welcome event as it validates the form factor in itself. I am however not seeing too many advantages for the Selig part in comparison especially at about twice the cost, am I missing something? bye, Said In a message dated 10/29/2013 14:54:51 Pacific Daylight Time, lstosk...@cox.net writes: Sorry if already posted: http://www.saelig.com/COMCR/COMCR002.htm ___ time-nuts mailing 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.
