SDR

SDR may refer to:

Places

• Santander, Cantabria
• Santander Airport, IATA airport code
• Somalia, previously known as the Somali Democratic Republic
• Southern Distributor Road, part of the Newport ring road in the United Kingdom
• Snailbeach District Railways, a mine railway in Shropshire, England
• Somerset and Dorset Joint Railway, defunct British railway system
• São Domingos de Rana, a parish in Cascais, Portugal

Reports and reviews

• Strategic Defence Review, a United Kingdom Ministry of Defence defence review
• System Design Review, a scheduled review which ensures continuous involvement throughout a program
• Swiss Derivatives Review, a magazine for the futures and options industries

Economics, maths and science

• System of distinct representatives, in mathematics
• Special Drawing Rights, in the International Monetary Fund
• Social discount rate, a measure of the value of diverting funds to social projects
• Selective dorsal rhizotomy, a neurosurgery

Technology

• ETSI Satellite Digital Radio
• Single data rate synchronous dynamic random access memory (SDRAM), a transfer mode for a data bus, in which there is a single data transfer per full clock cycle
• Software-defined radio, radio communication system which uses software for the modulation and demodulation of radio signals
• QRIO, originally named SDR for "Sony Dream Robot", an entertainment robot
• XDR (audio) or Super Dynamic Range, a quality-control process for extending the recording quality of cassettes
• Standard Dimension Ratio, method of rating pressure piping. The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as

SDR = D / s, where, D = pipe outside diameter (mm) s = pipe wall thickness (mm) engineeringtoolbox.com SDR

Entertainment

• Süddeutscher Rundfunk, a former German radio station
• Sudden Death Records