dual gate fet

Shortened dipole for 10 & 40m bands - A shorten Dual-Band Dipole with overall length of about 11 m. For this antenna traps are substituted by inductors, in order to cover the 10 & 40 m. Bands.

Dual Band 40m/17m dipole - A center feed dual band dipole for 40 and 17 meters by W5DXP

Dualband yagi for 50 70 Mhz - PA5DD version of the dual band yagi antenna for 50 and 70 Mhz

Dual band 6m/4m Yagi - This antenna was optimized with the goal to minimize any changes in 6jxx6 impedance/lobes. The result is a 7 el on 70 MHz with a little loss of gain comparing with the other monobands of the same lenght.

VHF/UHF Wideband Portable Dipole - A portable dualband dipole robust and compact antenna usable for horizontal and vertical polarisation by ON6MU

Dual Band J-Pole - Copper Dual-Band super J-Pole antenna project

WX2NJ JPole bicycle antenna - 2 meter or Dual Band J-pole bicycle antenna

Dualband 17m/20m Moxon - A moxon rectangle for 17 and 20 meters band by N3OX

G0FTD's experimental INDiX antenna - This antenna is meant to be hung indoors within a window frame for those who can't get an outdoor antenna erected. Plan include dimensions for 50mhz 70Mhz and 144Mhz

Homebrew a dual band antenna for handhelds - A project by DL5DBM for a VHF UHF antenna suitable for handheld transceivers

Morgain antenna by I1CRA - A dual band wire antenna project in Italian

N9RO - Ham Radio, PropNet, WSPR & SDR - Personal ham radio blog. PropNet, WSPR, SDR's, and more ham radio stuff.

AL7LE Moose Horn Amateur Radio Club - Dedicated to the art of Ham Radio, enhancing individual operational and technical skills as well as providing communications during local and national emergencies. Located on the Kenai Peninsula in South Central Alaska.

Yuba Sutter Colusa Tri-County Online Public Safety Scanner - The Yuba-Sutter area's only known online public safety scanner, supporting agencies in Yuba, Sutter and Colusa Counties. Alpha-numeric support for frequency identification with the use of Winamp or iTunes media players.

Rock-N-Rescue - Rock-n-rescue the source for safety and rescue equipment focused on delivering the best equipment for climbing, water fire and search rescue

MB7ICL Echolink node - MB7ICL Echolink Node Clacton on Sea, Essex The Gateway to the world

Ham Rig on a Bicycle? - A ham cyclist looks at the benefits of combining his two favorite hobbies, ham radio and cycling

Google Earth 4-D Inonosphere - Free real-time Earth Space 4-D global 4-D ionosphere using Google Earth, by CAPS/ES4D Gateway

AESHAM comparison charts - Compare dual band hand-held transceivers

Yaesu VX-2R Dual-Band Transceiver Review - Usage information and notes compiled by Anthony W. Haukap

Radio Arena - Supplier of two-way radio products and accessories to large and small businesses, volunteer groups, radio amateurs and individuals. Transceivers, receivers, antennas cw keys

D-STAR Gateway Software - ICOM software to interconnect D-Star systems

Spectrum Analyzer Real-time FFT - Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.

Lightning Protection for the Amateur Radio Station - Article on lightning protection for the ham radio station, Lightning Characteristics, Identify What is to be Protected, Establishing a Good Ground, Coax Cable Grounding, Operating Safety by wrblock.

Fundamentals of Lightning Protection - National Lightning Safety Institute