|
|
Article: 134 kHz ISM, safety again.(MESH, MOBILE, M2M--WHAT DO YOU WANT TO KNOW?)(Industrial-Scientific-Medical frequency)
- Article from:
- Sensors Magazine
- Article date:
- April 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Questex Media Group, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
|
Why Use 134 kHz?
From what I've read, wireless sensors and other wireless devices work at ISM frequency bands of 900 MHz and 2.4 GHz. But I've read, too, about "ISM-compliant" RFID tags and readers that work at 134 kHz.
Is 134 kHz an ISM band? Are there other ISM frequencies? And why would a company have something working at 134 kHz when they could use the 900 MHz band?
Signed, Ever-Compliant
Wise Guy: While most ISM discussion covers the 900 MHz and 2.4 GHz ranges, a number of other ISM bands exist. Figure 1 lists them. RFID tags and readers, like other wireless gizmos, may operate in any of these bands.
In the U.S., two ...