[time-nuts] LTE-Lite Antenna
Bob Camp
kb8tq at n1k.org
Sun Nov 23 02:20:44 UTC 2014
Hi
> On Nov 22, 2014, at 9:14 PM, S. Jackson via time-nuts <time-nuts at 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,
> wb4gcs at 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 at aol.com_ (mailto:SAIDJACK at 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 at n1k.org_ (mailto:kb8tq at 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 _<wb4gcs at wb4gcs.org>_
> (mailto:wb4gcs at 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 at amsat.org_ (mailto:wb4gcs at amsat.org)
>>
>>
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