Hi, if you're worried about in-band interference, the 23cm HAM radio band is reasonably close to the L1 GPS frequency. When I was still active in packet radio back in the days, our digipeater DB0DAR lost an interlink due to interference with a precision GPS receiver in use by another university institute. We had to shut it down. I think they operated a DGPS site at the time and our link traffic caused errors in the correction data. Or something.
BR, Matthias On Montag, 11. Juli 2022 01:19:18 CEST skipp Isaham via time-nuts 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 > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com