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Array Solutions

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KM5KG RF Network Designer Contents 

This computer program provides a number of functions for the professional radio operator and the ham radio community, written by Grant Bingeman who has 35 years of experience in the high-power broadcast industry.  The standard version contains 42 functions.  The Pro version includes additional advanced functions.  Extensive user help is built into all functions.  Runs on Windows 98SE, Windows 2000, Windows XP.

 The program is supplied on a USB drive for portability to use on multiple PCs.


Many of the functions can be called from other functions, such as multi-axis data plotting.  Impedance bandwidth can be determined and plotted in L, Tee, Pi and other networks.  Individual component values can be adjusted manually to determine interaction of various network parameters, such as impedance match, voltage and current stress, attenuation, gain, etc.  Component losses are included in all calculations.



Transmission Line functions

Open-wire:  balanced above ground 

Closed-wire:  unbalanced above ground 

Co-axial:  unbalanced concentric 

Microstrip: etched on copper-clad surface 

Transformer:  impedance and phase change vs SWR 

Stub:  capacitor and coil substitutes using open or short circuit terminations 

Simple Network functions 

L:  how to transform an impedance with a series and a shunt component, at a fixed phase shift 

Tee: how to transform impedance and phase shift with two series and one shunt component 

Pi: sister of the Tee network, but two shunt and one series component; two voltage nodes instead of three 

Shunt:  how a single shunt impedance affects impedance and phase 

Adjuster:  how to vary a leg reactance with a tapped coil and fixed capacitor 

Tanks:  series and parallel resonant circuit analysis and design 

Special Network functions 

Diplexer:  two transmitters operating at different frequencies share the same load 

Combiner:  two in-phase transmitters operating at the same frequency share the same load; several types – hybrid pi, Egyptian tee, and L. 

Power Divider:  how to split power between different antenna elements; several types – series, shunt and Ohm’s Law. 

Balun: balanced tee network 

PA:  Transmitter output network Tee-L or L-Pi 

Math Utilities 

Tee / Pi:  transformation between tee and pi configurations 

Cartesian / Polar:  conversion of rectangular to polar coordinates 

Series / Parallel:  equivalent impedance parallel and series combinations 

S Parameters:  conversion of impedance matrix to scattering matrix 

Skin Depth:  effective resistance of conductor at RF 

Great Circles:  latitude and longitude plots of tunnel and surface paths around Earth 

Smith Chart:  plots impedances on user-defined Zo, calculates SWR, reflection, resonates at center frequency, translates impedances around rim of chart 

Phased Array Tools 

Array Phase Shifts:  integrates transmission lines, networks, and power divider phase shifts, also taking into account negative towers 

Array Geometry:  displays lay-out of array and converts between polar and rectangular coordinates 

Pattern Plots:  displays fields vs azimuth in polar and rectangular plots 

Complicated functions 

Impedance Broadbanding:  insertion of high-Q networks to counteract narrow-band loads. 

Matrix:  general complex impedance matrix form of network analysis 

Mutuals:  mutual impedance between vertical elements 


Capacitor: pipe and plate forms 

Solenoidal Coil:  single layer spiral inductor 

Toroidal Coil:  low-loss, internal field inductor 

Attenuator:  balanced and unbalanced resistive padders 

Model:  tee and pi network models, including losses


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