AirTalk.org

news-west.teranews.com · Guest

Who gets notified when an ELT goes off ??

Please list a reference on this answer.

thanks,
ck

MH · Guest

Anyone listening on 121.5 will hear a beeping sound when your ELT goes off.
this will include pilots overhead, as well as any FSS within the area.

Next the SARSAT system will pickj up your transmission and will attempt to
pinpoint your location using triangulation?

The sar sat will also notify the correct authorities for that area, next
will probably be SAR teams that use the signal to find you.

The signal isn't special other than it uses a common frequency. you COULD
just as easily communicate o nthe same frequency, it's not the technology,
just the rules that prevent you from doing so.

"news-west.teranews.com" <scupper79 (AT) msn (DOT) com> wrote

A Lieberman · Guest

news-west.teranews.com wrote:

Bob Gardner · Guest

Right...but the SARSAT must make two passes over your location before any
action is taken...they don't respond to a single "hit." Imagine bleeding
while the satellite makes a turn around the earth. As I understand it, the
new 406Mhz ELTs, while more expensive, will eliminate this problem.

Bob Gardner

"MH" <viennatech (AT) nospamyahoo (DOT) com> wrote

news-west.teranews.com · Guest

thanks for the answers so far, I appreciate them.

As far as I knew, it was just a common frequency with rules keeping us from
using it.

The SARSAT is news to me, and I will research it to get up to snuff as you
guys are.

My question is stemmed from a teacher giving us the assignment so here was
the best place to get ideas generated.

thanks again,

ck

"news-west.teranews.com" <scupper79 (AT) msn (DOT) com> wrote

Tim Hogard · Guest

Bob Gardner (bobmrg (AT) comcast (DOT) net) wrote:
: Right...but the SARSAT must make two passes over your location before any
: action is taken...they don't respond to a single "hit." Imagine bleeding
: while the satellite makes a turn around the earth. As I understand it, the
: new 406Mhz ELTs, while more expensive, will eliminate this problem.

The E in 121.5 ELTs stands for something. I'm sure of it.

The problem is a 121.5 ELT is cheap but the new ones cost too
much for widespread use. Here in an Aussie boat catalog we have a 121.5
ELT for AU$199.00 (about US $157) or a 406.025 unit for AU$1899.00. which
are you going to buy?

Well it turns out that the typical 121.5 stuff is so noisy that any
decent detection system could find oddities in its singal and with
coordination with other sats pinpoint that down to a few meters.
This has been done with stuff in orbit now so why can't it be done
with 121.5?

It would be trivial to modify future 121.5 ELTs to send a serial
number signature and any carrier phase thats inverted could could
be used to locate it via future GPS sats but for some reason
we all need to buy over priced new ELTS.

If you agree with extending 121.5, email the fine folks at:
http://www.navcen.uscg.gov/

-tim
http://web.abnormal.com

Bob Gardner · Guest

What's your point? Sure, it is an "emergency" locator, but it still plays by
the rules. This is from 6-2-5 in the Aeronautical Information Manual:

"(f) Because of the large number of 121.5 MHz ELT false alerts and the lack
of a quick means of verifying the actual status of an activated 121.5 MHz or
243.0 MHz analog ELT through an owner registration database, U.S. SAR forces
do not respond as quickly to initial 121.5/243.0 MHz ELT alerts as the SAR
forces do to 406 MHz ELT alerts. Compared to the almost instantaneous
detection of a 406 MHz ELT, SAR forces' normal practice is to wait for
either a confirmation of a 121.5/243.0 MHz alert by additional satellite
passes or through confirmation of an overdue aircraft or similar
notification. In some cases, this confirmation process can take hours. SAR
forces can initiate a response to 406 MHz alerts in minutes compared to the
potential delay of hours for a 121.5/243.0 MHz ELT."

I repeat, it takes two passes if you rely solely on the ELT to save your
butt.

Bob Gardner

"Tim Hogard" <thogard (AT) abnormal (DOT) com> wrote

MRQB · Guest

well i know now ill want a 406Mhz ELT

"Bob Gardner" <bobmrg (AT) comcast (DOT) net> wrote