DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Explore a detailed collection of antenna projects and DIY designs at vu3dxr.in. This tag features practical builds, tuning guides, and performance tests for various amateur radio antennas. From wire dipoles to specialized SDR antennas, discover step-by-step instructions to help you construct and optimize effective aerials for your radio station.
Space is often a premium for radio amateurs, but you don’t have to sacrifice performance to enjoy HF bands. The capacitor-loaded shortened dipole antenna, popularized by G7UNF, is a compact, multi-band antenna design that uses a center-mounted adjustable capacitor to tune resonance across several amateur radio bands. This post explains how the antenna works, gives […]
The delta loop antenna represents one of the most versatile and efficient antenna designs for HF amateur radio operations. This triangular closed-loop antenna configuration offers excellent performance characteristics while maintaining relatively simple construction requirements. Understanding the fundamental principles, design considerations, and performance characteristics of delta loop antennas is essential for amateur radio operators seeking to […]
DIY Active Antenna for superior HF and VHF reception! This DIY electronics project amplifies weak signals to lift hard-to-hear broadcasts out of the noise
Boost your HF reception with this classic Active Antenna circuit covering 0.5 to 30 MHz. Learn how to build a high-gain, low-noise wideband antenna perfect for SDRs and shortwave receivers in space-constrained environments.
Tired of static on your AM or shortwave radio? Do you struggle to hear distant stations? There is a simple fix. You can build a special antenna that makes radio signals much stronger. This guide shows you how to build a DIY active antenna. It is a fun project that can give you crystal-clear reception. […]
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.
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.
Amateur Radio – End fed Halfwave antenna – Web resources and links An end-fed half-wave (EFHW) antenna is a type of radio antenna that is a half-wavelength long and has its feed point at one end. This makes it a very simple and compact antenna, and it is often used for portable or temporary applications. […]
A short linear loaded ham radio band HF antenna is a type of antenna that uses linear loading to reduce its physical length. Linear loading is a technique that involves adding parallel conductors to the antenna elements. This increases the antenna’s effective length, allowing it to operate at a shorter physical length. Short linear loaded […]
This 80M Trapped dipole antenna is the work of Nadisha 4S7NR, modified by YC0HLE which results are matched at a frequency of 3,845 MHz. This design will be resonant at a frequency of around 3,250MHz to 3,850MHz. Coil inductance = 67.83 µH, made of email wire diameter = 1 mm, diameter of the cocker = […]