frequency 453.850

British Columbia Ham Radio Coordination Council - Frequency coordinations on BC Canada

UNYREPCO - Upper New York Repeater Council, Inc, support the frequency coordination needs of the Amateur Radio repeaters operating in its area

Florida Repeater Council - ARRL-recognized amateur frequency coordinating body for the State of Florida

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

FORDAHL - The FORDAHL Group was founded in 1981 and quickly established itself as a leader in the area of high end miniature frequency control products.

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

High Frequency Active Auroral Research Program - A Scientific endeavor aimed at studying the properties and behavior of the ionosphere.

Handling of extremely strong signals K2 Mod - Makes reception at frequency of strong tx close by possible

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

iPad iPhone HF Weather Fax Decoder App - HF Weather Fax lets you receive marine weather radiofascimile transmissions on your iPad, iPhone and iPod Touch. Just connect it to a shortwave radio tune in a weather fax frequency, and watch the images come in.

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

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.

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.