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.
