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Paul T wrote:

>Very typical is fine.  Just not useful for winter adventurers.  The
>choice between a relatively warm snow cave, where the signal won't get
>out, and too cold for the unit to work, is not a choice.

Did you miss the point that to be certified as a Class 2 PLB, it is 
required to operate for 24 hrs at -20C and for Class 1 cert. it's 
-40C for 24 hrs? And the battery needs to have a 5 year shelf life. 
Again, the signal you really care about is the initial 406 ping to 
the satellite. The 121.5 is incidental. One would hope that you've 
made your emergency bivi cave somehow noticeable by ground and air 
based SAR ops.

BTW, the standard for avi beacons is 200 hrs at +10C transmit time 
and 1 hr receive time. But since an avi beacon is worn under your 
jacket at minimum and is against your body, it tends to stay above 10C.

>So you have to trust that the tiny company you bought this proprietary
>(ie expensive) battery from will stil be around in 5 years.  Lleh,
>it's hard enough finding replacement battery packs for name brands,
>like Sears.

Yes, although the company in question is not that tiny.

> >Uh, the standards which are used to certify and license PLB devices.
> >
> >http://www.cospas-sarsat.org/MainPages/indexEnglish.htm
> >
> >http://wireless.fcc.gov/services/index.htm?job=service_home&id=pers 
> onal_locator
>
>Sorry, these pages describe some stuff about licensing, nothing about
>the "rigorous testing standards".

To be licensed and certified requires standardized testing. Dig 
deeper. Follow the links off the cospas-sarsat page. Read some of the 
200 page PDFs that describe all this. Do your own Googling!

-marc 

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