The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
This application has four calculation functions for RF Engeneer .1) dBm to W and W to dBm calculator .2) ATT value in dB to each Resistors of circuit .3) Resistors of circuit to ATT value and Impedance.4) Resistance connected parallel .Picker Wheel Data setting interface is very simple for all functions .DETAILS of functions1) dBm/W Set the power value in dBm using numeric Wheel ,It can input below the decimal point using last wheel. Power value in W will calculate above area .The unit is changed by the value Ex: W,mW,W,kW . Minus dBm value is possible from 0.01W , using [+/-] Wheel.Using last wheel to set W/mW/W/kW , you can calculate W to dBm . The first wheel will change to numeric Data in while you set the unit to w~kW .This calculate is based on 0dBm = 1mW .2) dB-RChoose ATT type  or [T] ,schematics will change type orT type .Select ATT value with right Wheel .R1,R2,R3 values will calculate above area .Resistor value is a calculated value ,not E24 numbers.3) R -dBChoose ATT tpe  or [T] ,schematics will change type or T type .Select R1 and R2 value with 2 Wheels .ATT Value will calculate above area,and calculated total impedance in Ohm .The impedance must select nearest value with transmission line's impedance .The value of resistor is selected from the E24 numbers.4) R1//R2 Select R1 and R2 value with 2 Wheels .Parallel Value will calculate above ,Note: info Button will show current version , and you can go to Support URL .