Radio Communication Technology Blog

Build Your Own Micro Power AM Transmitter! : Learn how to build a simple Micro Power AM Transmitter for short-range audio broadcasting. Great for beginners exploring amplitude modulation and radio circuits Ever wanted to broadcast your own tunes or messages a short distance? This simple Micro Power  AM Transmitter  circuit, based on the design from  Techlib.com , is a fantastic way to get started with radio electronics! This compact circuit is designed for short-range transmission, perfect for experimenting or creating your own miniature broadcasting station. At its heart, it uses a few common transistors and passive components to generate a stable radio frequency and modulate it with your audio input.

27MHz AM Transmitter Circuit for hobbyists : Explore the classic 27MHz AM Transmitter circuit. Learn about its oscillator, modulation, and power stages to build your own radio projects.

How to Build a 3-Watt AM Radio Transmitter : A 3-watt AM (Amplitude Modulation) transmitter represents a moderate-power radio frequency device designed for transmitting audio signals across the AM radio spectrum. Operating at 3 watts of output power, this transmitter delivers a broadcast range spanning several hundred meters to multiple kilometers, with actual coverage determined by antenna design and surrounding environmental factors.

Exploring the MSI.SDR: A Low-Cost Gateway into Software Defined Radio : The MSI.SDR is a broadband SDR receiver that covers frequencies from 10 kHz to 2 GHz, making it suitable for a wide range of applications. Software Defined Radio (SDR) has revolutionized the way we interact with radio frequency (RF) signals, offering flexibility and accessibility to hobbyists, engineers, and researchers alike. Among the many SDR devices available, the MSI.SDR stands out as a budget-friendly option that opens the door to wideband RF experimentation. The MSI.SDR is a low-cost software-defined radio (SDR) device, often marketed as an affordable alternative to established SDR platforms like the SDRplay RSP1. It is designed for hobbyists and experimenters interested in exploring radio frequency (RF) signals across a wide frequency range. Its origins as a clone of the SDRplay RSP1, using Mirics MSi chips, have raised concerns about intellectual property and performance reliability. This article provides ...

Terminated End Fed Vee Antenna (TEFV) : It is a travelling wave antenna, which has a constant current distribution along its length. Antennas usually used by radio amateurs are resonant standing wave types like dipoles. It is built to a specific tuned length so that a standing wave is set up on the antenna element. This is efficient and narrow band, only works on the fundamental frequency. In a travelling wave antenna there are no standing waves on the antenna element as the power that would be reflected back from the end of the antenna is absorbed by the terminating resistor. Typically this is 25% of the power applied to the antenna.

Aperiodic Multiband Wire Antenna: A Simple and Effective Design : Learn about the DK7ZB and HB9KX aperiodic multiband wire antenna. This simple, no-tuner design uses a 100-ohm resistor to operate across multiple HF bands

Shrinking the Dipole: Building the Shorty Forty Antenna for 40M Band : Build a short dipole antenna for the 7 MHz ham radio band. The Shorty Forty design uses loading coils to deliver strong 40-meter performance in limited space.

Morgain Antenna: Dual-Band Dipole that Beats Traps : Build high-performance HF Morgain antenna with accurate dimensions and simple construction. Complete guide with diagrams, spacing, materials, and tuning tips.