Single Operator Two Radios (SO2R) for Contesting
Learn how to set up and operate an SO2R station to maximize your score in amateur radio contests, covering software, hardware, and techniques.
Single Operator Two Radios, or SO2R, is an advanced contesting technique employed by amateur radio operators to maximize contact rates during competitive events. This operational mode involves a single operator simultaneously managing two transceivers, often on different bands or modes, to maintain high activity. The primary goal is to minimize idle time by allowing the operator to transmit on one radio while listening or tuning on the other, thereby increasing the total number of contacts made within a contest period. It requires significant skill in station management and rapid decision-making.
Resources in this category provide guidance on setting up and optimizing an SO2R station, covering aspects from station layout to software integration. Operators can find information on specialized SO2R controllers designed to manage audio, PTT, and antenna switching between two radios, as well as tutorials on configuring popular logging software like N1MM Logger+ for dual-radio operation. The collection also includes articles detailing practical station builds, strategies for maximizing operating efficiency, and techniques for incorporating supplementary equipment such as Software Defined Radios (SDR) into an SO2R setup to enhance situational awareness and improve search and pounce capabilities.
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How to setup and work SO2R with N1MM the popular free contest logging software -
Andrew Roos (ZS6AA) details his practical approach to building a Single Operator Two Radio contest station within suburban constraints. The article explains how he leveraged a Force-12 C-31XR triband beam's unique separate feed arrangement to operate on two bands simultaneously. Using band-pass filters and an antenna switch, he achieved sufficient isolation between bands without requiring multiple towers. The setup includes automatic band selection, audio switching, and computer control. Testing during the 2007 CQ WPX CW contest confirmed the system's effectiveness, demonstrating that competitive SO2R operation is achievable with limited space and budget. -
Adding a Software Defined Radio to an SO2R station -
Single operator two radios (SO2R) operating practice at wikipedia -
Single operator two radios, resources controllers and products -
Uderstanding Single Operator two radios amateur radio contesting mode, an article by CT1BOH -
This is an explanation of the intended way to use TR LOG with two radios in the ARRL November Sweepestakes, CW. The concepts and techniques presented here can work for you in other contests, as most of the ideas are the same.