frequency 453.850

Coaxial feeder or RF coax cable - An overview of coax cable often called coaxial feeder or RF cable, used to feed antennas and deliver radio frequency power from one point to another

Helical Antennas - The Helical antenna description, a simple way of obtaining high-gain and a broad band of frequency characteristics

The Versatile Vee Beam - An aerial that you can use on all eight High Frequency amateur bands (80, 40, 30, 20, 17, 15, 12 and 10m) with an antenna tuner, and which gives significant gain on the five bands from 20 m to 10 m

V25WV Barbuda - DX mobile from Barbuda follow on twitter wd8mgz for frequency schedule time or on ecolink

Resonant Frequency Podcast - The Amateur Radio Podcast by KB5JBV

Quartslab - Quartslab has over 30 years of experience in supplying quartz crystals to the international communications market. Our product range includes the supply of quartz crystals in the frequency range 1.5 to 225 MHz in all popular holder types as well as crystal oscillators in DIL8 and DIL14 packages.

Hittite Microwave Corporation - Amplifiers, filters, attenuators, mixers, PLL, switches and frequency dividers, signal generators, power detectors, transimpedance amplifiers, variable gain amplifiers and more

Space frequency listing - Downlink frequencies for all kind of satellites

VLF Group - Starlab Very low frequency group

How Satellite Doppler Tracking Works - The Doppler Effect allows the distance between a satellite transmitting from space and a radio receiver on the ground to be measured by observing how the frequency received from the satellite transmitter changes as the satellite approaches, passes overhead, and moves away.

VOACAP Online - Online professional-grade high-frequency (3-30 MHz) propagation predictions

Small Antennas for High Frequencies - This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

U.S. VHF Channells - US coast guard frequency list

What's On Short-Wave right now? - Find out what station is broadcasting in what language on what frequency. View schedules by frequency, language or station.

Multi-Instrument - Contains a PC sound card based signal generator. It can generate functions, multitones, arbitrary waveforms, burst tones, MLS, DTMF, musical scales, white noise and pink noise, and frequency/amplitude sweep. Fully functional free trial downloadable.

Frequency Response Plotter - Draw static response time of an audio system. Originally intended for loudspeakers tests, is also a great tool for looking at microphone equalisation.

Spectrogram for iPhone - Spectrogram for iPhone displays a live, scrolling display of sound frequency components derived from a 1024 FFT analysis.

Low cost frequency counter - Low cost multifunctional seven digit LCD frequency counter, for your HAM radio shack

Frequency Counter - Timer - Logic Tester - Frequency counter project. It includes quite a number of useful testing features which were very useful when building other projects

Simple frequency counter - This is an incredibly simple and cheap frequency counter with binary readout, based on the ideas of Onno PA2OHH.

Improved PL Tone encoder - N1HFX project to improve PL tone encoder providing a more stable frequency

General purpose RF Wideband PreAmp - General purpose RF Wideband PreAmp based on BSX-20 transistor with a frequency range 14-550 MHz

RFI (Radio Frequency Interference) - This page is meant to be a resource for hams interested in understanding and eliminating RFI problems.

Identifying sources of radio frequency interference - This page describes the results of some tests with a portable spectrum analyzer in attempt to identify the sources of RFI around the house. Radio interference was found in a number of unexpected places.

Frequency calibration procedure - Method of master oscillator calibration on most solid state rigs that are out there today by KK5DR