homebrew rf attenuator

The Impact of Current Distribution on Array Patterns - Technical Correspondence, QST, July 1990 - Why even "perfect" phased array element currents don't produce perfect patterns.

Homebrew A 4 To 1 Balun - How to build a to 1 balun by N1HFX

The Bazooka vertical  ^pop - This is a deviation from the wonderful antenna the Double Bazooka.

Bazooka vs Dipole - Discussion, will a double bazooka outperform a dipole, enough to notice a difference on 40m.

The full-wave loop antenna - These omnidirectional antennas offer Horizontal polarization, and about 2.1 dbd of gain. They are much quieter than a dipole or a vertical, have a broader bandwidth and will usually out perform a dipole antenna.

Loop Antenna Design - Full-wave loops are very popular antennas. They are especially useful on 80 and 40 meters where they perform well at modest heights

A homebrew 10-element 900 MHz quagi - A 10 elements quagi antenna for 900 mhz

CSVHFS Antenna Gain Measurements - The Central States VHF Society has conducted Antenna Gain Measurements since its inception in 1967. Comparisons between commercial and homebrew antennas, between different homebrew designs, and between different commercial designs. Mostly VHF UHF and up antennas.

Homebrew your own inductors  ^pop - Can’t find the inductors you need for an antenna, a tuner or amplifier? Build your own—it’s easy! By Robert H. Johns, W3JIP

High Performance Wire Antennas - Popularity doesn't guarantee high antenna performance, disadvantages of trap antennas

eham DX Spots - DX Spots web cluster interface with filtering features available to eham subscribers

Better RF company - Pre-recorded voice keyers, Tune controls for Yaesu FT-100, FT-857 and FT-897, Icom IC 706 and IC 718

BHI Ltd - Noise eliminating products. Remove unwanted background noise and interference leaving only the speech. Clear communications, listen stress free. Dsp noise cancellation solutions.

KK7UQ - Digital Radio - The KK7UQ computer to radio interface, sound card interfaces, IMD meters interface products

microHAM - Supply high quality accessories for your ham shack, including Band Decoders, various types of Antenna Switches, Antenna Stacking devices, special devices designed for the SO2R operator, USB Interfaces, Digital Mode Interfaces, Keyers and many others

Expanded Spectrum Systems - Flash crystals, Feakin' beacon keyer, beacon attenuator

Wilderness Radio - The only source for kits aimed specifically at the outdoor QRP enthusiast. These kits, field-tested by members of the NorCal QRP Club, represent the state of the art in portability, low power consumption, high performance, and flexibility.

Spectrum Instruments - Spectrum manufactures very high-performance, low-cost, GPS-disciplined time and frequency reference standards for industry, scientific, calibration, broadcast and amateur operators.

APRS using a weather station - Interface APRS to a weather station

SciTech Publishing - Publisher of many RF, Electronics and antenna books

Homebrew 813 Linear Amplifier - 813 Linear Amplifier Project includes many schematics, drawind and assembling construction

Build An Audio Speech Processor - When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort.

Simple Electronic Keyer - A simple keyer which can be built for as little as $6 with some junk box parts. Although this circuit is not a true iambic keyer, it is capable of producing perfectly sounding CW.

RFI From Computer Networks - Is your router shutting you down ?

Television channel 11 interference. - Solving interference from television channel 11 on 144MHz transverters by Chris Cox, NØUK, G4JEC