http://www.blackcatsystems.com/software/rftoolbox.html
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RF Toolbox is an antenna design and electronics/electrical tool package. It takes you step by step through the design of the following types of antennas:
* Dipole
* Fat Dipole
* Yagi
* Long Yagi
* J-Pole
* Super J-Pole
* Log Periodic
* Cubic Quad
* Vertical
* Helical
It also performs the following calculations:
* Transmission Line Calculator
* Coil Design
* LC Filter Design
* Transmission Line Loss
* L Matching Networks
* Pi Matching Networks
* Impedance Calculations
* Wire Gauge and Resistance and Voltage Drop
* Wire Inductance Calculations
* dB Calculations
* Resistor Color Code Calculations
* Low and High Pass Butterworth and Chebyshev Filter Design
* Thermal Noise Calculator
* Pi Network Attenuator Calculator
* Tee Network Attenuator Calculator
* 555 Timer Oscillator Calculator
* RF Link Budget Calculator
* Gamma Match Calculator
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With the transmission line calculator, you can select the type of line, length, operating frequency, and calculate the losses, as well as the SWR and losses from SWR due to impedance mismatch. The load impedance can also be calculated from the measured impedance at the line input.
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