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Articles
Explore a comprehensive collection of technical articles and DIY guides on amateur radio at vu3dxr.in. This category features expert insights into antenna design, SDR, and practical electronics. Whether you’re a seasoned ham or a beginner, discover step-by-step tutorials and projects to enhance your radio communication and technical skills.
Terminated Antennas for HF Ham Radio: A Technical Guide
This guide explains terminated antennas for HF ham radio, which use resistors to absorb reflected energy and maintain stable impedance across wide frequency ranges. It covers designs like Beverage and T2FD antennas, highlighting their broadband performance, directional patterns, and suitability for multiband, low-noise, and space-restricted installations.
Terminated Mini Loop Antenna : Small Space Ham Radio Antenna
This article explains a terminated mini loop antenna designed for small spaces, combining loop geometry with resistive termination to achieve directional reception and reduced noise. It covers construction using wire, a terminating resistor, and a matching transformer, delivering wideband HF performance without a tuner for compact installations.
Microphone Audio Compressor in Single Sideband Radio
This microphone audio compressor for SSB radio combines a low-noise preamplifier with automatic gain control to maintain consistent speech levels. It boosts weak audio and limits peaks, improving average modulation and clarity without distortion, making transmissions more intelligible, especially in low-power HF setups.
Can You Use MXR Dyna Compressor for SSB Radio?
This article explains why the MXR Dyna Comp, a guitar compressor pedal, is not suitable for SSB amateur radio use despite being a compressor.
It points out key issues like impedance mismatch, since guitar pedals expect high-impedance inputs unlike microphone or line-level signals used in transceivers. It also highlights that the pedal’s frequency response and controls are designed for musical audio, not narrowband voice signals used in SSB.
SSM2167 audio processor for Baofeng Mic enclosure
SSM2167 audio processor for Baofeng Mic enclosure Mic gain is barely adequate on the µBITx transceiver since there is no Mic Gain control. It would also be helpful to not only provide mic gain control, but to add compression in order to boost the average power output.The SSM2167 is a powerful audio processor that can […]
Decoding the Motorola GM300 Model Number
Decoding the Motorola GM300 model number provides critical details about the radio’s specifications, such as frequency band, power output, channel capacity, and more. The GM300 model number typically follows Motorola’s standard convention, with the first six characters indicating the base model and the subsequent characters specifying features like RF power, frequency range, channel spacing, and […]
DIY Programming cable for a Motorola GM 300 series two-way radio
DIY Programming cable for a Motorola GM 300 series two-way radio To make a DIY programming cable for a Motorola GM300, you will need the following materials: A USB-TTL adapter An RJ45 Ethernet connector A standard silicon signal diode, such as the 1N4148 An Ethernet cable. Once you have gathered your materials, follow these steps […]
Terminated End Fed Vee Antenna (TEFV)
Terminated End Fed V Antenna (TEFV) – It Is a travelling wave antenna, which has a constant current distribution along its length.
DIY – Making printed circuit boards
Making printed circuit boards There are many ways to produce your own printed circuit boards. Small boards for DC switching circuits are easy to make because neither the size nor the shape of the copper foil traces is critical. Boards containing many digital ICs are considerably harder to lay out and etch. There are also […]