ASTM F1491-93(1997)
(Specification)Standard Specification for An Avalanche Beacon Frequency
Standard Specification for An Avalanche Beacon Frequency
SCOPE
1.1 This specification establishes a National Avalanche Beacon Frequency.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: F 1491 – 93 (Reapproved 1997)
Standard Specification for
An Avalanche Beacon Frequency
This standard is issued under the fixed designation F 1491; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope kHz) is mandatory in all devices. Use of the interim frequency
(2.275 kHz) shall not impair or disable effective operation with
1.1 This specification establishes a National Avalanche
the standard frequency.
Beacon Frequency.
3.4 Transition to Standard Frequency—Both frequencies
2. Terminology should be employed during the interim period. Incorporation of
the interim frequency is intended to provide temporary back-
2.1 Definitions of Terms Specific to This Standard:
ward interoperability with older beacons, until such devices
2.1.1 avalanche beacon—an electronic device for radio
can be replaced or retired. Beacons incorporating both frequen-
location of persons buried or trapped, usually by snow, and
cies should be employed until December 31, 1995. After this
employing radio frequency electromagnetic induction.
date, only single frequency (457.0 kHz) beacons should be
3. Requirements
employed and the use of 2.275 (kHz) should be discontinued.
3.1 Standard Frequency—The avalanche beacon shall op-
4. Significance and Use
erate on a frequency of 457.0 kHz.
4.1 Avalanche beacons are used for the location of persons
3.2 Additional Interim Frequency—The avalanche beacon
who are buried by avalanches. In operation, users wear the
may also operate on a frequency of 2.275 kHz.
beacons, which are all set to transmit. After
...
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