Re: [time-nuts] LTE-Lite Antenna
Hi Pretty much all of the “timing” GPS antennas want to see 5V to work properly. About the only thing I’ve seen that likes 3.3V are the modern mag mount antennas. Bob On Nov 22, 2014, at 4:55 PM, Jim Sanford wb4...@wb4gcs.org wrote: All: Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement. Does anyone know if the antenna which the ebay purveyor of the Nortel Thunderbolts supplies will work on the 3.3 volts coming out of the LTE Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That antenna has the advantage of being at altitude with a feedline run to the basement. Thanks, Jim wb4...@amsat.org --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ___ 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] LTE-Lite Antenna
Jim, try it out. Check the C/No values in the GPGSV NMEA messages. If they are over 40dB, then it works just fine and there is no need to over-think the issue.. bye, Said In a message dated 11/22/2014 16:39:55 Pacific Standard Time, kb...@n1k.org writes: Hi Pretty much all of the “timing” GPS antennas want to see 5V to work properly. About the only thing I’ve seen that likes 3.3V are the modern mag mount antennas. Bob On Nov 22, 2014, at 4:55 PM, Jim Sanford wb4...@wb4gcs.org wrote: All: Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement. Does anyone know if the antenna which the ebay purveyor of the Nortel Thunderbolts supplies will work on the 3.3 volts coming out of the LTE Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That antenna has the advantage of being at altitude with a feedline run to the basement. Thanks, Jim wb4...@amsat.org --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ___ 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-nu ts 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] LTE-Lite Antenna
Hi Jim, not much harm should come to the 5V antenna if driven at only 3.3V. However if you feed 5V into the LTE Lite antenna port then bad things will happen because it will back-feed into the 3.3V power rail, and possible damage some of the 3.3V parts on the PCB. Running a 3.3V antenna port with external 5V feeding in is never a good idea.. That said you can actually power the unit from 3.3V coming from another unit through just the antenna port. Don't ask me how I know.. bye, Said In a message dated 11/22/2014 18:09:16 Pacific Standard Time, wb4...@wb4gcs.org writes: SAID: After checking schematics, was contemplating exactly this. I wanted to make sure I can't do any harm, and it appears not. Will probably give it a try tomorrow If it doesn't work, I've come up with a bias-T and amplifier. Will have to spin a PCB, tho. Will advise. Jim On 11/22/2014 8:46 PM, _SAIDJACK@aol.com_ (mailto:saidj...@aol.com) wrote: Jim, try it out. Check the C/No values in the GPGSV NMEA messages. If they are over 40dB, then it works just fine and there is no need to over-think the issue.. bye, Said In a message dated 11/22/2014 16:39:55 Pacific Standard Time, _kb8tq@n1k.org_ (mailto:kb...@n1k.org) writes: Hi Pretty much all of the “timing” GPS antennas want to see 5V to work properly. About the only thing I’ve seen that likes 3.3V are the modern mag mount antennas. Bob On Nov 22, 2014, at 4:55 PM, Jim Sanford _wb4...@wb4gcs.org_ (mailto:wb4...@wb4gcs.org) wrote: All: Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement. Does anyone know if the antenna which the ebay purveyor of the Nortel Thunderbolts supplies will work on the 3.3 volts coming out of the LTE Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That antenna has the advantage of being at altitude with a feedline run to the basement. Thanks, Jim _wb4gcs@amsat.org_ (mailto:wb4...@amsat.org) --- This email has been checked for viruses by Avast antivirus software. _http://www.avast.com_ (http://www.avast.com/) ___ time-nuts mailing list -- _time-nuts@febo.com_ (mailto: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_ (mailto:time-nuts@febo.com) To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. (http://www.avast.com/) This email has been checked for viruses by Avast antivirus software. _www.avast.com_ (http://www.avast.com/) ___ 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] LTE-Lite Antenna
Hi On Nov 22, 2014, at 9:14 PM, S. Jackson via time-nuts time-nuts@febo.com wrote: Hi Jim, not much harm should come to the 5V antenna if driven at only 3.3V. However if you feed 5V into the LTE Lite antenna port then bad things will happen because it will back-feed into the 3.3V power rail, and possible damage some of the 3.3V parts on the PCB. Running a 3.3V antenna port with external 5V feeding in is never a good idea.. That said you can actually power the unit from 3.3V coming from another unit through just the antenna port. Don't ask me how I know.. I wonder how well that works with an OCXO based unit….. Bob bye, Said In a message dated 11/22/2014 18:09:16 Pacific Standard Time, wb4...@wb4gcs.org writes: SAID: After checking schematics, was contemplating exactly this. I wanted to make sure I can't do any harm, and it appears not. Will probably give it a try tomorrow If it doesn't work, I've come up with a bias-T and amplifier. Will have to spin a PCB, tho. Will advise. Jim On 11/22/2014 8:46 PM, _SAIDJACK@aol.com_ (mailto:saidj...@aol.com) wrote: Jim, try it out. Check the C/No values in the GPGSV NMEA messages. If they are over 40dB, then it works just fine and there is no need to over-think the issue.. bye, Said In a message dated 11/22/2014 16:39:55 Pacific Standard Time, _kb8tq@n1k.org_ (mailto:kb...@n1k.org) writes: Hi Pretty much all of the “timing” GPS antennas want to see 5V to work properly. About the only thing I’ve seen that likes 3.3V are the modern mag mount antennas. Bob On Nov 22, 2014, at 4:55 PM, Jim Sanford _wb4...@wb4gcs.org_ (mailto:wb4...@wb4gcs.org) wrote: All: Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement. Does anyone know if the antenna which the ebay purveyor of the Nortel Thunderbolts supplies will work on the 3.3 volts coming out of the LTE Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That antenna has the advantage of being at altitude with a feedline run to the basement. Thanks, Jim _wb4gcs@amsat.org_ (mailto:wb4...@amsat.org) --- This email has been checked for viruses by Avast antivirus software. _http://www.avast.com_ (http://www.avast.com/) ___ time-nuts mailing list -- _time-nuts@febo.com_ (mailto: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_ (mailto:time-nuts@febo.com) To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. (http://www.avast.com/) This email has been checked for viruses by Avast antivirus software. _www.avast.com_ (http://www.avast.com/) ___ 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.
