w2ihy noise gate constru

Beverage Antenna Construction - Types of beverage wires, choose best supports and insulators, multiple antennas at one feedpoint, all well documented with photos and exaustive explanation.

Comparison of Beverage antenna - A ranking of receiving antennas based on noise being evenly distributed in all directions. These rankings are most accurate in the frequency range of AM broadcast, 160 or 80 meter bands

HC DX Feeding that antenna - Avoid noise, boost performance: make a perfect coax feed line. The perfect feedline, How to install your antenna properly, How to get the best from your coax

The G5 RV Antenna - Theory and operantions, G5RV construction tips by Keith, KE2DI

G5RV multi-band antenna construction guide  ^pop - Excellent guide to build a G5RV by Lombry

Construction Practices - The construction of light weight structures that support wire antennas requires some definite insight into the behavior of the materials

Pfeiffer Quads - The Pfeiffer Quad was described in QST and has the desirable feature that it is smaller than a standard cubic quad but does not compromise performance very much. The Pfeiffer design is rather difficult to construct because of the complicated linear loading networks required.

Interference Cancelling System - The use of interference signal cancellation has been around for some time. The idea is to use an auxiliary antenna almost any random length of wire in addition to the main receiving antenna

Quarter Wave with radials - VHF quarter wave antenna mainly for scanner usage, The quarter wave antenna is an easily designed and constructed antenna for whatever frequency you want, although with the following design, you may to limit it to the VHF and UHF bands due to the physical size.

Half square antenna - The elevated half square antenna is a very simple antenna that can be constructed from common materials yet gives significant improvement over a dipole at the same elevation. Ground mounted versions of this antenna are commonly used in amateur radio for 75/80 and 160 meter bands

Yahoo! Groups : eh-antenna - This group has been created to promote discussion relating to the EH Antenna. There should be many with experience with the EH Antenna, so don't be shy about asking questions on construction and efficiency.

AR2 communications - Complete catalog of low noise preamplifiers and microwave Gunnplexers.

BHI - Speakers and RFI noise reduction products

ALT Fabrication - ALT Fabrication manufacturer and distributor serving the telecommunication industry. Boomgates, Sector frames, grounding, electrical.

Power Line Noise - I have a shortwave radio, but I get nothing but a loud buzzing on it. What's wrong?

Electronic Construction Tutorial - Everything you wanted to know about building stuff but were afraid to ask." This series was originally published in "73 Amateur Radio" between November 1997 and February 1998

VLF-LF And the Loop Aerial - The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise. A Loop Aerial is described suitable for use on the LF and VLF bands together with a circuit of an interface loop tuner and preamplifier. The discussion extends to the problems of amplifier noise and the advantages of tuning the loop.

Morse code ringtone generator - This page converts text into a morse code ringtone playable on most mobile phones.

Radio 101 International - Informations about RADIO 101, constructing home brew transmitters, pirate radio, pagers, salsa, latin-dances, tango, Ecuador, Quito, Ukraine, Kiev, Ireland and more. Themen: Sendetechnik, Sender, Piratensender, Schaltpläne, Baupläne, Magnetkarten, Irland, Ukraine, Ecuador, SMS, Pager etc

Spy Number Stations - So you want to listen to the spies?

Introduction to number stations - long article on number stations history

Nec2Go - Powerful antenna modeling tool using NEC 2 computing engine. Nec2 specifically provide users, either those experienced with the Nec2 processes, or for those who are neophytes but want to model their own antennas. Nec2Go uses a simplified process for defining the antenna structure and then providing view of the structure, plots (2D and 3D) and other significant data that is pertinent to the design. This simplified process uses an edit file with equations for all definitions.

SV2AGW Packet Engine Professional - This is a brand new program based on the well Known "AGW Packet Engine/ AGWPE". It is a special Windows utility for amateur radio packet users that interfaces multiple packet programs and multiple TNCs (Terminal Node Controllers) / modems: lets one TNC be used by more than one packet program, lets one packet program use more than one TNC, lets your sound card be used as a physical TNC or modem, no need to buy a TNC , has an optional 'TCP/IP Over Radio' feature that lets you send TCP/IP data sentences via packet to internet gateways

A 80/40m DDS controlled QRP CW transmitter - JUMA-TX1 is a 5W CW transmitter for the 80/40m bands. Juha (OH2NLT) and Matti (OH7SV) have had high quality CW keying and a compact size as design goals for this project. No coils need to be wound to construct this transmitter!

Antenna Noise and Signal Cancelling at LF - By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.