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Categories
- Technical Reference > 3D Printed Projects
- Technical Reference > Digital ATV projects
- Technical Reference > QRP Projects
- Antennas > 12M
- Antennas > 20M > 20 meter Dipole Antennas
- Antennas > 40M > 40 meter Delta Loop Antennas
- Antennas > 40M > 40 meter Loop Antennas
- Antennas > 40M > 40 meter Vertical Antennas
- Antennas > 40M > 40 meter Yagi Antennas
- Antennas > 6M > 6 meter J-Pole Antenna
- Antennas > 70cm
- Technical Reference > Antenna Rotator
- Technical Reference > APRS
- Technical Reference > Arduino
- Technical Reference > ATV
- Technical Reference > Batteries > Battery Charger
- Antennas > Bazooka
- Antennas > C-Pole
- Antennas > CobWebb
- Technical Reference > DTMF
- Technical Reference > Frequency Counter
- Antennas > G5RV
- Technical Reference > Headsets and Speakers
- Antennas > Log Periodic
- Technical Reference > Arduino > Morse Code
- Technical Reference > Morse Code Decoder
- Technical Reference > Power Meter
- Technical Reference > Power Supply
- Technical Reference > Receivers > Progressive Receiver
- Technical Reference > QRM Eliminator
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Antenna projects and info center by KP4AO, including The Optimized Wideband Antenna (OWA) Yagi and Skyhawk, a state-of-the-art trapless tribander -
Described here is a simple omni-directional, vertically-polarized dipole for two meters. Made from coaxial cable, it can be rolled up and stored in a small container -
A homebrew project for a 2 meter 4 element yagi beam antenna by 2E0HTS -
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Build parabolic WLAN antenna adapted from a small satellite dish. It provides high gain and long range connections. -
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. -
Ham Radio applications with the Arduino micro-controller presentation -
HA2NON W3DZZ antenna project with pictures and construction details -
This article was reprinted to assist new hams at building their own 2 metre antenna. This design is very rugged and can be built for a few dollars with most of the parts available at your local Home Depot. -
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This project describes an ARDUINO based automatic antenna tuner, for an end-fed half wave (EFHW) antenna, working on 20 & 40 meter bands -
CuteSDR Open-Source application for MacOSX , Linux, and Windows designed to run with RFSPace SDR receiver -
These pages cover the step by step construction of a Handmade Morse code telegraph key in pictures and text -
These devices are called Traps, but they are actually more like frequency sensitive switches. They are parallel resonant, high Q, tuned circuits which provide a very high impedance at their frequency of resonance. -
Use plain water with a little salt added to build your own Dummy Load -
KF4SCI picture of a project for a VHF UHF jpole antenna working on 220 and 440 MHz. -
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Get KB1OIQ - Andy's Ham Radio Linux CD at SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory -
Easy to use double tone IQ-generator for testing direct conversion SSB-transmitters based on phasemethod etc. -
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An open source software decode various xMBE based modes. It support decoding QPSK, C4FM modes such as P25 Phase 2 (TDMA), MotoTRBO, NexEDGE, ProVoice and others more. -
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. -
JTDX (JT Digital Modes for Linux, MacOS and Windows) is a free, open-source software for amateur radio operators for the reception and transmission of digital modes, including JT65, JT9, and FT8, among others. JTDX is designed to provide improved decoding of weak signals and better usability compared to other digital mode software like WSJT-X. It also has features like a real-time spectrum display, logging, and decoded message storage and retrieval. Download JTDX from the official site. -
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Experience of band filters, for a contest multi operator enviroenment -
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. -
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On 23cm the best way to obtain a good RX-sensitivity is to use a GaAs-FET in the front-end, since these devices show very low noise figures. -
The DRM Software Radio is based on the proven Fraunhofer DRM engine, which is considered to be the most advanced DRM engine today, built around fully licensed proprietary DRM encoding technology. -
An interesting rotator interface that interfaces a pc to a rotor or rotator controller, emulating a Yaesu GS-232A/B and Easycom protocols, made with Arduino -
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Signal Generator (VFO) with Direct Digital Synthesis by Bruce AA0ED and Craig AA0ZZ -
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GNU Radio is a collection of software that when combined with minimal hardware, allows the construction of radios where the actual waveforms transmitted and received are defined by software -
80m hexfet power amplifier by W7ZOI -
The webpage provides information on a two-element Yagi antenna for 24 Mhz, created by IK4DCS. It includes details on the design and construction of the antenna. -
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The DSP Satellite Transceiver is a conceptual transceiver designed as a dedicated unit for amateur satellite operators. The initial concept was brought about by the lack of satellite functionality on modern amateur radio transceivers, and the specialized requirements of the ham radio operator who utilizes OSCAR amateur satellites. -
3 to 12 MHz signal generator, simple local signal source -
A 5-band (20m-10m) HF antenna - Just 7ft square and great for a small garden. Build it yourself for around 60 GBP. -
The Windom antenna was widely used in the 1930s and is named after the amateur that wrote a comprehensive article about it -
This free windows program allows CW operators to copy CW code with a computer. The decoded CW is displayed as text or can generate a side tone. There is a spectrum display of the audio with a sliding cursor to select a particular audio for decoding. The program also allows for keying a transmitter from the keyboard with full CW break-in operation. -
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This antenna can be made in a couple of hours and involves a fair amount of measuring, cutting, bending, and bolting metal. -
This signal generator is intended for realignment of radio receivers -
The free pdf book is a compilation of articles congenial to QRP published on 2003- 2005 years at free e- magazine AntenTop. 17 Mb pdf file. -
Yo5ofh j-pole antenna plans for 2 and 6 meters