Amateur radio project notes, setup references, and practical build information for radio hobbyists.
As the CQWW CW draws near, I would like to see how the HF propagation goes on based on my local area. I would also want to see whether my antenna could pick up some remote stations from the noisy RF. I am an apartment dweller, living in the downtown area of a city. I […]
Setting Up a CW Skimmer Server by a Hermes-Lite2 SDR Read More »
Overview Have you ever wondered how far a UV band antenna could reach if it were mounted 1000 meters above the ground? It is a fascinating question for radio amateurs and technical hobbyists alike. Let us break down the science and look at what is practical in real operating conditions. First, 1000 meters is no
How Far Can a 1000-Meter-High UV Band Antenna Communicate? Read More »
Overview Days ago, I built a ground elevated vertical based on a 5.6m whip for SOTA and POTA activations. As the radials went above the ground, it didn’t cause huge ground losses due to the poor real ground near the antenna. The antenna works really great, with the linked counterpoise, you just used 2 radials
A Ground-Elevated Vertical Based on 5.6m Whip — Improved Read More »
When doing POTA or SOTA activations, I prefer the vertical antennas. That says I don’t have to bring a long enough antenna mast that could support my wire antennas. For example, an end-fed, it’s a good antenna, but you need a pole or a tree to set it up, in horizontal, vertical or in V-Shape
A Ground-Elevated 5.6m Whip Vertical Antenna: Build Guide Read More »
digiPi is a software system that is based on Linux for amateur radio digital communications. Its primary function is to make various amateur radio digital modes easily accessible via Wi-Fi through a standard web browser. It simplifies amateur radio digital modes operation by providing a pre-configured, bootable image for a Raspberry Pi. It supports a
A digiPi APRS Unit Based on a digiPi HAT Read More »
Overview: A vertical antenna is an unbalanced antenna, but it may still need a common mode choke balun to choke out the unwanted current flowing on the outer surface of your coax braid. Reasons for A Choke Balun: 1. Blocking Unwanted Radiation from the Feedline A vertical antenna uses the radial system (your elevated ground
A Current Choke Balun with a 3D Printed Housing Read More »
The full-wave loop antenna stands as a fascinating and effective alternative to the ubiquitous dipole, offering desirable characteristics such as gain of approximately 2dB over a dipole, a typically lower noise floor, and a closed-loop radiation pattern. Traditionally, a square or circular full-wave loop presents a feed point impedance in the range of 100-120 ohms,
A 50-ohm Full-Wave Loop for 2m Band Read More »
