Hi Agusto

Q: how much accuracy do you need for C value ?

I  presume that 0 < C < 1 for normal situations

jon



--On Saturday, August 23, 2003 5:02 AM -0500 CVT-SSS <cvt@CVT-SSS.COM>
wrote:

> 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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