How to Predict Tropospheric Ducting
Tropospheric ducting is a fascinating phenomenon that allows radio signals, especially in the VHF and UHF bands, to travel far beyond their normal line-of-sight range. How to predict tropospheric ducting…
Vince
HF Noise Floor: Analysis and Optimization
HF noise floor analysis is essential for improving signal quality and ensuring reliable high-frequency communication. The noise floor represents the level of background noise in a receiver, below which signals…
K and A-Index for HF Planning
The K and A index are essential tools for predicting high-frequency (HF) radio propagation. These indices measure geomagnetic activity, which directly affects the ionosphere and, in turn, impacts how radio…
Reverse Beacon Network: Test Propagation In Rea-Time
Reverse beacon network plays a crucial role in modern amateur radio and HF communication planning. A reverse beacon network consists of automated receivers, known as skimmers, that listen continuously for…
Frequency Division Multiple Access
Frequency Division Multiple Access, often called FDMA, represents one of the most fundamental techniques used in communication systems to allow multiple users to share the same communication medium. Engineers designed…
Ham Radio in Apollo Missions
When humanity set its sights on the Moon, communication stood as one of the most critical challenges. NASA developed sophisticated systems for mission control and spacecraft operations, yet ham radio…
Early Ham Radio Pioneers
Early ham radio pioneers were primarily hobbyists, experimenting with Morse code and radio waves starting in the 1920s. For instance, Lee de Forest, an American inventor, significantly contributed to early…
Radtel RT-910B Overview
The Radtel RT-910B is a multi-band handheld radio that combines power, flexibility, and modern programming options. It covers a wide frequency range, including the 6-meter band from 45 to 59…
Weatherproofing Gear In The Field
When you operate in the field, weatherproofing gear is essential. Weather conditions can change rapidly and unpredictably. Rain, snow, wind, and dust all pose risks to sensitive equipment. Therefore, understanding…
Radioddity DB40-G GMRS Transceiver
The Radioddity DB40-G is a 40-watt, mobile GMRS transceiver designed for drivers, off-roaders. In addition to base users who want strong UHF performance in a compact chassis. Moreover, it adds…