frequency interference

Yagi Antenna Elements Boom Correction - Dragoslav Dobricic, YU1AW antennex article on influence of Boom on frequency performance and how compensate it

Another Approach to Active Antennas - Active antenna with a frequency response that is flat from 5kHz to over 30MHz

Beacon Station MO 189.5 KHz - This site is dedicated to experimental low frequency operation in the 160 to 190 kHz spectrum. LF beacon MO is no longer active. This page is retained only for reference information.

Arizona Spectrum Management Association - This is the site for the Arizona Spectrum Management Association. This group is a frequency coordination group for the Arizona and the Tri-State Area

Tecom - Tecom industries product line encompasses a wide range of highly sensitive active and passive antennas for use in airborne and ground applications, providing complete coverage of the 20 MHz to 40 GHz frequency range.

Satellite Frequency List - List of satellite frequencies from HT to VHF and UHF

Shortwave Frequency Guide - Frequency list with service name and related comments

AMSAT : Satellite Operating Frequencies - A comprehensive list of Ham Radio satellite frequency usage listed in order of frequency

MFSK16 - An MFSKMulti-Frequency Shift keying DX Mode. A new weak signal DX mode for Radio Amateurs, employing M-ary FSK, phase continous tones and convolutional coded FEC.

IC-7000 Expand TX - MARS CAP Modification to extend transmit frequency coveragefor the IC-7000

Orion II Frequency response - Frequency response graph for the Te-Tec Orion II

FT-450 Mars Mods - Mars Mod for Yaesu FT-450 extending frequency range: 1.8-30 MHz

PorkControl for Yaesu FT-817ND - PorkControl is a Java-based software controller for the Yaesu FT-817ND (and older FT-817) HAM transceiver. It is currently in beta and released under the GNU GPL v2 on Windows, Linux and MAC OSX. PorkControl is used to control frequency and other features without using the fiddly controls on the unit itself. It also supports automatic radio control to access repeaters based on the UK Repeater List.

Yaesu VX170 Mod - Extend VX-170 frequency range on Yaesu VX-170

Microwave Antenna Design Calculator - Available to run on all major operating systems, this free calculator provides quick estimation of antenna size required for a given gain and frequency.

Radio Works - RadioWORKS is a tool for calculating various items related to radio waves and radio wave propagation. Get detailed information about a frequency, such as the free-space wavelength, band classification, propagation methods, common transmitter configurations, etc. Calculate antenna lengths or frequencies. View a 3D coverage map by providing a latitude / longitude coordinate and transmitter height.

SimJT - SimJT is a simulation program. It generates audio-frequency JT65 and CW signals in a background of gaussian white noise, with user-specified signal-to-noise ratio.

Resonant Frequency Calculator - This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

W3LPL Receiving Bandpass Filters - Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT

Universal frequency counter & voltage meter - to be used with QRP transceivers

Frequency Counter project  ^updated - Circuit and construction instruction designed by Mani VU2ITI

Connect a frequency counter to MFJ 9406 - Modification to connect a frequency counter to a MFJ-9406 50 MHz transceiver by ON6MU

Frequency Locked Loop VFO for HF - A device which joins in a single microprocessor a digital programmable frequency meter and a control logic capable to lock a manually tuned VFO to its actual frequency by IK3OIL

75 meter AM Transceiver - Frequency coverage: 3.75 MHz to 4.00 MH transceiver for 75 MHz band

A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing - Understanding and solving RF interference problems using ferrite