[time-nuts] Re: GPS failed

[Andy Talbot]

There is a 3G/4G Supplementary Downlink allocation at 1492MHz in some
countries.   Close enough to cause problems.

Andy
www.g4jnt.com



On Mon, 11 Jul 2022 at 14:40, paul swed via time-nuts <
time-nuts at lists.febo.com> wrote:

> Skipp
> I am aware at least in the US that there is the possibility of 5G
> interference along with newer possible bands that 5G can use. I have read
> several articles in a publication called GNSS.
>
>
> Thats why I am using wwvb at 60 KHz. Humor intended.
> Regards
> Paul
> WB8TSL
>
> On Mon, Jul 11, 2022 at 8:49 AM skipp Isaham via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
> > Hello to the Group,
> >
> > I'd like to get some opinions and war stories regarding GPS reliability
> at
> > high RF level and elevation locations.
> >
> > Background:  Three different hill-top GPS receivers, all different types,
> > using
> > different antennas mounted on an outside fixiture, plain view of the open
> > sky,
> > all stopped working.
> >
> > Test antennas were brought in and placed on a fixture well away from the
> > original antennas, the recevers went back in to capture and lock.
> >
> > From what I understand, the original antennas are what I would call
> > straight
> > preamp with no pre-selection / filtering.
> >
> > The ordered and now inbound replacements are said to contain a SAW filter
> > system. It is the intent of the client to just place these "improved
> > antennas" in
> > to service and get on with life.
> >
> > I would suspect a GPS antenna (and receiver) could be subject to RF
> > overload
> > or blocking, however, we're assuming nothing major has changed at the
> > site, nor
> > any nearby location.  One might think there are more GPS receivers being
> > pushed
> > out of reliable operation by the world around them, I'm just not hearing
> > those stories
> > from a lot of people using them (GPS receivers).
> >
> > Any new install GPS receiver antenna ordered will/should contain some
> > pre-selection
> > to potentially avoid a problem, even some years down the road? Seems like
> > that's
> > where things are going... no more off the shelf, wide band, (hot)
> > preamplified GPS antennas
> > in busy locations?
> >
> > Thank you in advance for any related comments and/or opions ...
> >
> > cheers,
> >
> > skipp
> >
> > skipp025 at jah who dot calm
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