frequency interference

Center-Fed Wire Dipole Antenna Tuning Calculator - Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght.

The Arkansas Repeater Council - recognized Amateur Radio Frequency Coordinating entity for the State of Arkansas.

RAC Frequency Coordination - Canada RAC Frequency Coordination

MetroCor - Northern New Jersey, New York City/Long Island and Westchester County frequency coordination

NFCC - The National Frequency Coordinator\'s Council (NFCC) is an organization comprised of and representing amateur radio frequency coordinators of the United States.

Illinois Repeater Association - The Recognized Amateur Radio Frequency Coordination Organization In The State of Illinois

Arizona Repeater Owners Frequency - a subcommittee of the Amateur Radio Council of Arizona

Low-frequency radio time signals - Several national physics laboratories operate radio transmitters that broadcast a time code signal.

Amplitude Modulation - Amplitude Modulation (AM) is essentially a mixing process where the audio modulating signal is mixed with the radio frequency carrier

RF Basics - A PDF guide to radio and radio frequency by Martin D. Stoehr

IC 706 Frequency Calibration - Icom 706MkIIG - Frequency Calibration

Texas Scanner Radio Frequency List - Scanner radio frequency list for athens henderson county texas

Shortwave Frequency List and Links - Shortwave frequency list and swl links

High Frequency/Shortwave Listening Log Book - HF / Shortwave listening Log book

FRED for UR5EQF_Log3 - Displays the UR5EQF_Log3 radio frequency larger making it easer to read, sends selected list frequency to radio by AL VK4BL

RF Sampler - This circuit will let you look at the signal and frequency output of your transceiver.

Common sources of QRM - Article on common sources of radio interference (QRM)

The EMI - RFI page - Article on radio frequency interferences, with a long list of common RFI cause, like Plasma TV, Solar panels inverters, fluorescent tube lamps.

Amateur Radio Interference - AB4D answer on an article talking incorrectly about ham radio interferences

Find RFI causes in mobile operations - Troubleshooting your power supply, in determinig connections to battery, alternator and regulator interference and checking power supply leads.

Ban PLT - Ban Power Line Technology a website devoted to defend amaterur radio against power line communications devices interferences

Circuit Improvements for the TS-440S - Some improvements for the Kenwood TS-440S, including distortion level in SSB in transmitted signals, Lack of crispness in the RX audio and Limited transmit frequency coverage.

RF Probe for HF - A RF Probe circuit for the RADIO frequency experimenter to check the presence of a RF signal and also to measure its strength

RF Probs and Watt meter - This RF probe can be used at High Frequency (HF) or Ultra High Frequency (UHF) on both 50 and 75 ohm coaxial cables.

Analog HF Antenna Analyser - A simple antenna analyser for the HF spectrum with a built-in signal generator with 3-digit LED frequency display.