Hi to all,

I4m just making an RF sensor with a PIC16F877A, reading Forward RF  ( FWD )
in AN0 and Reverse RF ( REV) in AN1 ports.
I have a max value of 1024 * ( 4.5 Volts / 5 Vots Ref. ) in each port,
giving me a max value of  921 in each case.
I need to get the value of the following formula:

SWR = 100 * (( 1 + C ) / ( 1 - C ))

where

C = SQRT( REV / FWD )

Question is how to calculate the square root of  ( REV / FWD ) ?

I was trying to develop a sum of series to get the SQRT but it is not enough
accurate and interpolation method is too slow.

Some ideas ?

Regards,

Augusto

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