function showcredit()



{

var credit

credit="Script programmed by Jens T.Saetre 25042001"

credit+="\n08122002 Changed layout"

credit+="\nUpdated 08122002"

window.alert(credit);

}













function Calculate()

{

var RX_Frequency,RF5150,RF9750,RF10000,RF10050,RF10600,RF10750,RF11000,RF11200,RxMin,RxMax,IF_Freq,RealLO





RX_Frequency=1*document.IF.RxFrequency.value;   // Reads the value on the form



RxMin=1*document.IF.RxMin.value;  // Reads the value on the form



RxMax=1*document.IF.RxMax.value;  // Reads the value on the form

RealLO=1*document.IF.RealLO.value;  // Reads the value on the form



IF_Freq=Math.abs(RX_Frequency-RealLO);  //Calculates the L-band IF frequency 





if ((IF_Freq > RxMax)||(IF_Freq < RxMin)) 

{

// IF frequancy is less than RxMin and higher than RxMax

document.IF.RF5150.value="IF out of range";

document.IF.RF9750.value="IF out of range";

document.IF.RF10000.value="IF out of range";

document.IF.RF10050.value="IF out of range";

document.IF.RF10600.value="IF out of range";

document.IF.RF10750.value="IF out of range";

document.IF.RF11000.value="IF out of range";

document.IF.RF11200.value="IF out of range";   

}

else 

{



// Do the calculations



RF5150=5150-IF_Freq;

document.IF.RF5150.value=formatvalue(RF5150, 6);

RF9750=IF_Freq+9750;

document.IF.RF9750.value=formatvalue(RF9750, 6);

RF10000=IF_Freq+10000;

document.IF.RF10000.value=formatvalue(RF10000, 6);

RF10050=IF_Freq+10050;

document.IF.RF10050.value=formatvalue(RF10050, 6);

RF10600=IF_Freq+10600;

document.IF.RF10600.value=formatvalue(RF10600, 6);

RF10750=IF_Freq+10750;

document.IF.RF10750.value=formatvalue(RF10750, 6);

RF11000=IF_Freq+11000;

document.IF.RF11000.value=formatvalue(RF11000, 6);

RF11200=IF_Freq+11200;

document.IF.RF11200.value=formatvalue(RF11200, 6);



}





}









function formatvalue(input, rsize) // Formatting decimal numbers to text 

  {



   var invalid = "**************************";



   var nines = "999999999999999999999999";



   var strin = "" + input;



   var fltin = parseFloat(strin);



   if (strin.length <= rsize) return strin;



   if (strin.indexOf("e") != -1 ||



       fltin > parseFloat(nines.substring(0,rsize)+".4"))



      return invalid.substring(0, rsize);



   var rounded = "" + (fltin + (fltin - parseFloat(strin.substring(0, rsize))));



   return rounded.substring(0, rsize);



}