# transmission line

## transmission line

• Parallel Circular Conductor Transmission Line Calculator - Design a parallel circular wire balanced transmission line with this online calculator. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance Zc and made of parallel circular conductors of a given diameter d.
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• ENIGMA 2000 - ENIGMA 2000 is a UK based online group, whose aims are to bring together listeners and enthusiasts who monitor and gather information on Number Stations and other related radio transmissions.
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• FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
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• Measure Impedence of Coax Cables - This video shows one way to use a scope and function generator to measure the length of a piece of coax transmission line as well as estimate its impedance
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• What is SWR - standing-wave ratio - Article about Standing-wave ratio (SWR) defined as a mathematical expression of the non-uniformity of an electromagnetic field on a transmission line. SWR is the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line.
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