160m Spitfire Antenna, Portable HF Antenna Options , Kenwood Ts590 v Elecraft K3, FTdx3000 Information pages, Kantronics TNC Wiring, USB to Serial Drivers by PROLIFIC, PC programming cable for Kenwood TH-F7E

Homebrewing a 6 Meter Yagi, Online Toroid Multi Calculator, RF Impedance Matching Calculator, IAT Interactive Antenna Table , Basic Microwave Antennas, FT-817 CAT interface, 17 meter QRP Transmitter,

Technical Reference/Arduino
This construction project is for anyone wanting to give this popular little radio a voice of its own. This Speech synthesiser reads out the current frequency, mode and menu settings whenever they are changed via the front-panel controls

Technical Reference/Amplifiers/HF Amplifiers
A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.

Technical Reference/Coax Cables and Connectors
Installation of Female N-Type Connector on 1-5/8 RFS Cellflex Cable

Technical Reference/Software Defined Radio
The author has build the Hermes-Lite SDR v1 and v2 versions describing with a very accurated text and picture the process. Additionally has documented measurements for each component

Beginning 2022 EZNEC will be released to the public domain and become free of cost and can be freely copied and distributed.

Operating Modes/Amtor
Putting one of those old modems back into use.AMTOR is an acronym for AMateur Teleprinting Over Radio and was mostly used on HF. The mode is based on the marine SITOR code that was introduced to amateur radio by Peter, G3PLX. The mode is an enhancement of RTTY with active error correction that copes reasonably well with interference and fading.

Antennas/Skeleton Slot
Slot cubes are folded skeleton slot antennas with widened, folded dipoles bent into a cube to reduce size. QST Article 12 2019

Technical Reference/HF Radios
This transmitter covers the 160, 80, 40 and 20 metre bands and provides both SSB and properly generated CW. The CW side of this transmitter is not compromised and produces excellent CW. On SSB the audio has been tailored to provide a rising response to 3 KHz, with a sharp drop above that frequency. There is RF speech clipping to both provide more "punch" and to limit the peak output.

Technical Reference/Filters
An home madek Audio CW Filter made simply using SMD Components

Speaker Wire EFHW Antennas 20m/ 40m, QRP 20m Transmitter, 4m QRP Transverter, A Homebrew Yagi for 1296 MHz DX, 23cm 1296MHz Field Day Yagi, Short DL6WU yagi for 23cm, DL6WU Yagi Antennas for 1200 MHz

Antennas/Longwave
Transformers can be used as part of a hybrid combiner or as phase inverters for an RX antenna array.

Technical Reference/Microphones
Repairing the RJ45 plug end of the mic cable of a Alinco DR-605 dual band mobile transceiver. Alinco microphones are well known for the cable jacket getting brittle and breaking

IC-R20 by Icom. Wideband Receiver Professional radioreceiver, allow double receiver, from HF to Microwave, digital recorde, DTCS, Memories and 11 hours countinuous reception.

Technical Reference/Spectrum Analyzers
An home made simple spectrum analyzer project includes pictures and diagram.

Technical Reference/Repeater
Instructions and Diagram for Interfacing the STM32_DVM DMR Controller to the Yaesu DR-1X Repeater

Xiegu X6100 - HF/50MHz Full-mode Ultra-portable Transceiver. A New Generation X Series Portable SDR Flagship

DX Resources/Contest/Contest Stations
Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control

Antennas/Tuners
There are quite a few variants of the design accompanied with many opinions on the effectiveness of the antenna. This page features links to some similar projects and a homebrewed personalized version of this portable antenna tuner