simple aprs pgm

The Field Day Special Antenna - Antenna that's simple, inexpensive lightwiight and easy to install

A 40m Vertical - This antenna is intended as a simple, inexpensive solution for the newcomer to experiment across the 40m band (7.0–7.2MHz) when only restricted space is available

Bazooka dipole for 70 cm band  ^updated - Here is a very simple 70cms dipole from Harald PD2HFE, which uses a single piece of RG-213 coaxial cable 34 cms in length.

The simplest phased array feed system that works - How to calculate "phasing line" lengths that actually work.

20m mini loaded dipole - It is very simple to build and you can tune it in your shack room

Picture of a multiband dipole  ^pop - Pictures of a multiband dipole, build with simple PVC T and standard electrical wire

WLAN antenna 2.4 GHz Do-It-Yourself  ^pop - A simple homebrew outdoor antenna to 2.4 GHz band.

Simple double-quad Antenna  ^pop - 2.4 Ghz quad antenna

A Tincan feed for 2.45Ghz - Construction details for a simple but effective antenna for 2.45Ghz wireless lan use.

Slotted Waveguide 802.11b WLAN antennas - 802.11b WLAN Waveguide Antennas Unidirectional & Omnidirectional. High gain, Simple construction by Trevor Marshall

A two element yagi bean - Simple gain antennas for the beginner, a 2 element yagi antenna

IW0QNL's HamRadio Web Server - Packet Cluster and BBS hamradio online, Server APRS and other.

K4TR Antennas - K4TR Manufacture and sell simple dipoles, half square 2 wire phased vertical arrays, end fed zepp antennas, G5RV antennas. 1:1 baluns

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

Adaptive Home Logic - Monitor / Control your home with APRS short text messages. Featuring Scheduling / Conditional Events, 2-way Speech, E-mail, file data, serial data, digital I/O, Sunrise/Sunset, natural language interface, interactive screen overlay scenes, logging + More

Yagi Modeler Applet - This java applet/application implements a simple yagi modeling code. The initial input is a really trivial 2 elmenent yagi.

AntWave - Frequency to Wavelength Calculator - A simple frequency to wavelength converter program for Windows price

Hamlog - A simple quick and easy to use Amatuer Log Book for windows

Avoid pitfalls when recharging batteries to ensure long life - Portable design - avoid pitfalls when recharging batteries to ensure long life - secondary batteries can be simple devices, but improper charging can be devastating to the user experience.

Build a simple rechargeable CMOS Battery - An inexpensive rechargeable CMOS battery system that can be built from readily available parts.

Simple Reverse Polarity Protection - This simple modification is applicable to pretty much any 12 volt operated, positive earth equipment. by Chris Cox, N0UK, G4JEC

A low pass filter circuit - A simple 7 element, Chebyshev low pass filter, rolls of at 30MHz. Attenuation is better than -40dB at 60MHz, -65dB at 90MHz, -80dB at 120MHz.

RS232 interface for Kenwood rigs - SS232K - The simple and safe RS232 interface for Kenwood radios

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.

A CW TX for 80 meters band - This simple circuit will give about 1.2 Watts of output when powered from a 13.8VDC supply.