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FCC Reiterates Jammer Prohibition

The U.S. Federal Communications Commission (FCC) is reminding state and local authorities that the ban on the use of radio signal blocking devices applies to them as well.

In an Enforcement Advisory issued in December 2014, the Commission reiterated that its regulations governing the use of so-called signal jammers provide no exemption for their use by school systems, police departments or other state and local authorities. Only federal agencies of the U.S. government are eligible to apply for authorization to use such devices.

Jammers are designed to block, jam or otherwise interfere with authorized radio communications by emitting radio frequencies that prevent wireless communication devices from initiating or maintaining a connection. Such devices can interfere with emergency 911 communications as well as communications between first responders, and are illegal under FCC regulations without express authorization. Violations of these regulations can result in monetary penalties of up to $122,500 for any single violation, and criminal sanctions including imprisonment.

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Mastering High Voltage: The Importance of Accurate Test Equipment

This whitepaper underscores that precise calibration of high-voltage test gear — especially when measuring 1 kV–150 kV systems — is essential for safety, reliability, and regulatory compliance. It details measurement techniques (voltage dividers, step-down transformers, etc.), the impact of environmental and connection factors on accuracy, and why traceable calibration (e.g. to NIST / A2LA) is a must to ensure consistent, reliable results.

Read the complete text of the FCC’s Enforcement Advisory regarding signal jammers.

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