[time-nuts] LTE-Lite Antenna
SAIDJACK at aol.com
SAIDJACK at aol.com
Sat Nov 22 21:14:17 EST 2014
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..
In a message dated 11/22/2014 18:09:16 Pacific Standard Time,
wb4gcs at wb4gcs.org writes:
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.
On 11/22/2014 8:46 PM, _SAIDJACK at aol.com_ (mailto:SAIDJACK at aol.com) wrote:
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
In a message dated 11/22/2014 16:39:55 Pacific Standard Time,
_kb8tq at n1k.org_ (mailto:kb8tq at n1k.org) writes:
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
> On Nov 22, 2014, at 4:55 PM, Jim Sanford _<wb4gcs at wb4gcs.org>_
(mailto:wb4gcs at wb4gcs.org) wrote:
> 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.
> _wb4gcs at amsat.org_ (mailto:wb4gcs at amsat.org)
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