project kits

Tenna Dipper Kit - The "Tenna Dipper" is a low power antenna analyzer and ATU tuning aid. With this handy accessory, you can determine the 50 Ohm resonance frequency of antennas or you can adjust your antenna tuner for a 50 Ohm match without generating QRM

Build a 2 Meter 5/4 Wave Antenna  ^pop - This antenna is unique in that it is enclosed entirely in 3/4" PVC by N1HFX

Build A 9dB, 70cm Collinear Antenna  ^pop - 70cm, Collinear Antenna From Coax

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

The Bazooka antenna - The Bazooka-antenna was developed by the staff of M.I.T. for radar use. The original Bazooka used coaxial cable for the entire radiating elements.

A standard double bazooka antenna - Article by Ed WE6W on a double bazooka antenna

Bazooka antennas compared to dipoles - Article and comparison between bazooka antennas and dipole, taking care of effieciency and bandwidth

Folded Bazooka Antenna - Article on building a folded bazooka antenna

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.

S&S Engineering - QRP kits

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.

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

Voltage Regulator From Discrete Components

10 Amp 13.8 Volt Power Supply - Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.

5 Watt 40 Meters transmitter - This circuit is unique in that it uses a power mosfet as a final rather than a conventional bipolar transistor.

Build A 100Khz Crystal Calibrator

Build a Vox Circuit - by Mike Martell N1HFX

A cheap S Meter - A low-level voltage meter and could even be used for audio purposes.

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.

Easy Morse Code Keyer Circuit - based on the famous Curtis family of morse keyer chips and has a proven record of dependability.

144Mhz preamplifier - A preamplifier project based on Rainer DJ9BV project, in french

Low-Power Transceiver Kits You Can Build - A Comprehensive roundup of the most popular QRP transceiver kits on the market in recent years in PDF format

The ROSE 80 CW Transceiver - Build a 5 watt, 80 meter QRP CW Transceiver Designed by N1HFX

An Inexpensive PL Tone Encoder - If your local repeater has got you singing the PL tone blues, then read on. For less than $10, an inexpensive PL tone generator can be constructed that will bring new life into that old non-PL rig.

SDR - Software Defined Radio Projects - An updated and classified collection of SDR projects and realizations