-
ARRL Letter Issue
Apr 8, 2021 ... Radio frequency interference (RFI) has been a problem for ham radio operators and SWLs (shortwave listeners) since the radio hobby began. Noise ... Learn More
-
Of Frogs and Canaries - ARRL
Sometimes a potential source of unnecessary radio frequency interference (RFI) from unintentional emitters — de- ... from the nearest external sources of manmade ... Learn More
-
Auto Manufacturer's Policies
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
-
FCC Special Counsel Laura Smith Visits ARRL
Spending all Thursday afternoon with ARRL Lab staff, Smith discussed power line noise and how it can affect Amateur Radio. "Since Riley had retired last year, ... Learn More
-
Interference - ARRL
Radio transmitter, FM: If signal modulation occurs, inhibition may be seen, relative to power, frequency modulation, and proximity. Noise reversion pacing is ... Learn More
-
Estimated Field Strength from Amateur Radio Stations -- ARRL #1
The external area around ARRL HQ is known to have a fairly high ambient noise level, primarily from power-line related noises. Measurements were made in the ... Learn More
-
March 17, 2005 Ms. Jody Noble, Esquire Duquesne Light Company ...
Mar 17, 2005 ... The complainant referenced in that letter is Mr. G. Robert Thacker, Amateur Radio licensee. K3GT, (address deleted). Although Duquesne Light ... Learn More
-
PROD REV.indd - ARRL
tiveness in locating noise sources. They are bidirectional and can easily be ... Both The ARRL Hand- book and our RFI web page (www.arrl.org/radio- frequency- ... Learn More
-
Experience the ARRL EXPO at the Dayton Hamvention®
Apr 21, 2010 ... The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, ... Learn More
-
FCC Rules and Regulations - ARRL
The Complete FCC Rules. In addition, here are some of the rules most likely to pertain to RFI and the Amateur Radio Service. 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.