-
FCC Enforcement - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
Handheld Direction Finding Loop Antenna for RFI Location - ARRL
A good way to locate radio-frequency interference (RFI) in the HF bands is with a small direction finding antenna and a portable radio. Learn More
-
Contribute RFI Files - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
Identify and Track Down - ARRL
Randy E. Standke, KQ6RS. Dealing with radio frequency inter ference (RFI) from neighborhood sources is unfortunately a part of the ham radio hobby, ... Learn More
-
Socorro Electric Cooperative - ARRL
Jan 9, 2008 ... a licensee in the Amateur Radio Service. The letter stated that Mr. reported no improvement in the noise levels at his Datil location, and that ... Learn More
-
Radio Frequency Interference: A Customized Information Handout
Why is RFI bad? RFI negatively impacts radio communications as well as potentially degrading the proper operation of consumer electronics devices. RFI sources ... Learn More
-
ARRL Serving its Members: NU2W's Story
Aug 15, 2025 ... The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, ... Learn More
-
Touch Lamp - ARRL
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources. Learn More
-
A Line Noise Sniffer That Works - ARRL
I tried to find the source by using an AM broadcast receiver, but I could only deter- mine a general location. My AM radio picked up the standing-wave power- ... Learn More
-
ARRL EMC Committee Report
Jul 17, 2024 ... ... noise, and other RFI sources. Power company attendees are generally well aware of amateur radio, as amateurs oftentimes find noise sources ... Learn More
NEW TO ARRL
LEARN MORE ABOUT
MEMBER QUICK LINKS
LICENSING LINKS
IN THE ARRL STORE
Copyright © 2026 The American Radio Relay League, Inc. All rights reserved. Reproduction of material from any ARRL web page without written permission is strictly prohibited.