frequency synthesizers

ZMV Spiral antennas - An experimental antenna similar to the TAK spiral antenna was evaluated for SWR response over the frequency range of 7.0 to 7.3 MHz, or the 40-meter band.

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 LF beacon MO is no longer active.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.

TCI International - US global provider of innovative radio frequency (RF) solutions for spectrum monitoring and antenna applications. Specializes in Spectrum Monitoring, Communications Intelligence , HF/MF Broadcasting & Communication antenna systems.

ASC Signal - Global manufacturer of Satellite Earth Station, Air Traffic Control Radar Antenna and High Frequency Antenna products for broadcast, government and enterprise satellite communication applications.

Taiyo Yuden - Ceramic capacitors, inductor ferrite products, high frequency dielectric components like chip antenna and filters.

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

Wavelab - Multi-frequency radio interferometers

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

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

Global Frequency Database - Frequencies from all over the world. 25000+ total records, 4600+ records feature exact GPS locations.

Ansoft Designer - Sesign-management environment and circuit simulator for radio frequency (RF) and microwave hardware development

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.

RadioComm - RadioComm can be used to program your Icom radio's memory, or to create nice radio-frequency spectra or to interface your radio to a huge database of frequencies.

HamPort - A Free windows, universal program for RIG control, can read and set mode and frequency on your transceiver. The program can control ICOM, Yaesu and Kenwood transceivers, by DXSoft

VersaBeacon Project - The VersaBeacon is a frequency agile, modulation agile RF source using a DDS chip and minimal support circuitry. It covers a frequency span of 1MHz to 150MHz in 1 Hz steps and provides a variety of modulations

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

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

Precision Frequency Marker - Homebew a frequency marker by 7N3WVM