Curious GPS Interference- Possible causes

Discussion in 'General Announcements' started by KB0MNM, Jun 14, 2020.

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  1. K6CLS

    K6CLS Ham Member QRZ Page

    I hope no one considers the thread closed or done, I'd like folks to post new updated and more specific info as it becomes available.
    KO4LZ likes this.
  2. KB0MNM

    KB0MNM Ham Member QRZ Page

    The reason that I was considering 'done' was because other than the latest replies, *Only KA0HCP* was good enough to comment on the theories that I expected might apply. If this were to be moved over to "News", rather than "General Announcements"- some folks might complain that it is not truly amateur radio. Yet the news of developments in the "Curious GPS interference" falls in three categories: 1. Reports of activities which might be classified as interference ( either intentional or by new sources ) to GPS reports through AIS ( or for that matter- any positioning system which generally works unless the antenna is shielded ). 2. Reports of the sources along with evidence given through official or independent observers. Note: the ARRL had/has a program of independent observers for amateur radio concerns. 3. Actions of groups approaching the F.C.C. and other authorities in the matters of frequency allocations in the GPS "L-band" /"Guard Band" range. Since #2 above includes the word evidence, it might be a much larger burden to provide- yet some of that is already found in the form of a table in the cited article. There are plenty of reports that the overall RFI/EMI 'noise floor' continues to increase worldwide, which is not what this 'thread' was supposed to be seeking- rather to explore what a few folks can monitor and report on.
    Maybe there is someone ( such as yourself ) that would care to 'restart this thread', given the same initial information. It seems safe to say that both the older ( non-crypto coded ) Global Positioning Systems in the L-Band and AIS systems in the VHF band are being intentionally interfered with. The real crux of the matter is whether or not there is something that we as amateur radio operators can do to preserve the GPS system as viable APRS reference. Since many are already providing weather reports and assisting public safety in 'parade' type events, I am certainly with K6CLS on preserving the thread- just not sure that someone else should 'restart' it , given what has been said about AIS having been 'hacked' or 'spoofed'.

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