Hi > On Nov 22, 2014, at 9:14 PM, S. Jackson via time-nuts <[email protected]> > 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, > [email protected] 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, [email protected]_ (mailto:[email protected]) 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, > [email protected]_ (mailto:[email protected]) 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 _<[email protected]>_ > (mailto:[email protected]) 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 >> [email protected]_ (mailto:[email protected]) >> >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> _http://www.avast.com_ (http://www.avast.com/) >> >> _______________________________________________ >> time-nuts mailing list -- [email protected]_ > (mailto:[email protected]) >> To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected]_ (mailto:[email protected]) > 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
