*** Avalanche Beacon Specifications ***

From: Brian Stachniak <bst@msmri.medicine.ubc.ca>
Subject: Re: how to make an avalanche beacon
Date: December 22, 1999 16:10

I am intrigued with this idea so I did a bit of research which I will share
with any techno-guys out there.

Some starting specs. (based on the European standard, EN 282:1991 which is
based on the standard DIN 32 924). The important technical specifications
are as follows:

    transmit frequency: 457 +/- 0.1 kHz
    transmit field strength: between 0.5 and 2.16 mA/m at 1 m
    receiver sensitivity: 80 nA/m for 6 dB (S+N)/N at speaker/earphone
output
    modulation: A1A (carrier on/off)
    turn-on time: >70 ms
    turn-off time: >200 ms
     period: 0.9 +/- 0.4 s
    operating temperature: -20 to 40 C
    storage temperature: -30 to 50 C
    operating time: 200 hours transmit at 10C followed by
     1 hour receive at -10C