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How Antennas Work at 915 MHz An antenna is a transducer that converts electrical energy (RF current on a transmission line) into electromagnetic waves and vice versa. Understanding the physics of this conversion is essential for making informed antenna choices...

Antenna Types for LoRa Mesh Choosing the right antenna type for a LoRa mesh deployment is one of the highest-leverage decisions you can make. In free space, doubling your effective communication range requires about +6 dB of gain (4x power); +3 dB increases ra...

Antenna Gain and Coverage Tradeoffs Antenna gain is not free - it is always traded against something else. Understanding what gain costs you is essential before choosing an antenna for a mesh deployment. The fundamental law of antenna physics is conservation o...

Coax Cable Selection Guide The coaxial cable connecting your LoRa radio to its antenna is a critical component that directly subtracts from your link budget. Every decibel of cable loss is a decibel less of received signal and, equivalently, a decibel less of ...

RF Connectors for LoRa Hardware RF connector incompatibility is one of the most common and frustrating problems when assembling LoRa mesh hardware. Knowing which connectors are standard on which hardware and understanding adapter losses will save hours of trou...

Minimizing Feedline Loss Feedline loss is the silent enemy of RF system performance. Unlike antenna gain (which you buy) or transmit power (which you set), feedline loss just silently destroys the performance you already have. This page provides the tools to q...

Antenna Mounting Best Practices Proper antenna mounting is the difference between a node that stays up through storms and one that fails or becomes a hazard. This page covers mechanical considerations, materials, and installation techniques for outdoor LoRa me...

Grounding and Lightning Protection A properly grounded and surge-protected antenna installation helps mitigate the destructive effects of direct lightning strikes and the more common (but still damaging) induced transients from nearby strikes, protecting peopl...

The Three Rules of Repeater Placement Every successful LoRa mesh deployment rests on three placement rules. Violate any one of them and the network will under-perform regardless of hardware quality, antenna gain, or software tuning. Rule 1 - Height Above Te...

The Radio Horizon Formula The theoretical radio horizon for a single antenna at height h metres above a smooth spherical earth, accounting for standard atmospheric refraction (the 4/3-earth model), is: d (km) = 4.12 × √h_m (radio horizon, 4/3-earth refract...

Link Budget Explained A link budget is an accounting of all the gains and losses in an RF communication link from transmitter to receiver. It tells you whether a link will work, by how much margin, and what changes would improve it. Every successful LoRa mesh ...

Why a Grid Approach? Ad-hoc repeater placement - putting nodes wherever a willing host can be found - produces uneven coverage with clusters of overlapping repeaters in some areas and dead zones in others. A systematic grid approach starts from coverage requi...

Fresnel Zones and Clearance One of the most common causes of unexpectedly poor radio links is obstruction of the Fresnel zone - not just the line of sight. Even when two antennas have a clear geometric line of sight to each other, a rooftop, hilltop, or dense ...

Why Single-Path Mesh Is Fragile A tree-topology mesh - where each node has exactly one path back to the network core - is the natural shape that forms when coverage is barely adequate. In a tree topology, the failure of any interior node partitions the networ...