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[aprssig] Automatic omni DF query

Bob Snyder rsnyder at toontown.erial.nj.us
Sun Feb 22 14:21:57 UTC 2009


On Mon, Feb 9, 2009 at 10:38 PM, Rick Green <rtg at aapsc.com> wrote:

> That's a moot point anyway - I just read on another site that the
> government has announced the discontinuance of satellite monitoring of
> 121.5 and 223.0, obsoleting a huge 'fleet' of ELTs., so all the boaters,
> aviators, and hikers will be forced to upgrade to the new standard.
>

The new 406 ELTs/PLBs/EPIRBs/etc still transmit on 121.5 to provide a signal
to home in on, and aircraft are still supposed to monitor 121.5 in flight if
able, so it's not completely useless. There's also been no regulatory
requirement for aircraft in the US to upgrade their 121.5 ELTs.

(Of course, if you have one of the nicer 406 beacons with built-in GPS,
it'll include your GPS coordinates in the data burst to the satellite, so
it's likely not a lot of homing in would be required.)

Bob N2KGO
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