Hi Matthias, There has been interference reported and resolved between 23cm and Galileo, which have signals in the 23cm band.
/Björn Sent from my Phone > On 12 Jul 2022, at 09:20, Matthias Welwarsky via time-nuts > <[email protected]> wrote: > > 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 -- [email protected] >> To unsubscribe send an email to [email protected] > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
