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Thread: Hunter rescued by helicopter after accidentally stabbing himself

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  1. 09-01-2018, 03:05 PM #11
    stretch
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    Quote Originally Posted by 223nut View Post
    From which point the helicopter picks up on the radio signal from the plb and homes in on it? Or have I got this wrong?
    Correct. Modern (406MHz) PLBs send data over satellite on 406MHz and also sends out the 121.5MHz homing signal for planes and helos to locate you. The GPS data gets "chopped" before transmission because the system was designed way back before the GPS selective availability was switched off for civilians.

    More than you ever wanted to know:

    https://www.gps.gov/systems/gps/modernization/sa/
    https://en.m.wikipedia.org/wiki/Inte...rsat_Programme


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