The program takes the text file INPUT.BC as input. Note that the input is ordinary FORTRAN format so the data must be placed exactly in the correct columns on each line.

The first line is the frequency of operation in MHz. The frequency must be given with a decimal point. The remaining lines contain data for a boom plus element combination in the following format: The decimal points must not be left out.

Col 1 Boom tube cross section. 0=round 1=quadratic Cols 2-11 Boom tube outer diameter in mm (side length if quadratic) Cols 12-21 Boom tube wall thickness in mm. Cols 22-31 Hole diameter in mm. Cols 32-41 Element diameter in mm. Cols 42-51 Element length in mm. Cols 52-61 Distance to nearest boom tube end. 0 or blank if element not close to end of boom tube. columns ruler 00000000011111111112222222222333333333344444444445555555555 12345678901234567890123456789012345678901234567890123456789 below are the first lines of INPUT.BC 144.100   0 16.0 1.5 8.0 6.0 930.0 0 20.0 1.5 8.0 6.0 930.0 0 25.0 1.5 8.0 6.0 930.0 0 30.0 1.5 8.0 6.0 930.0 0 40.0 1.5 8.0 6.0 930.0 0 50.0 1.5 8.0 6.0 930.0

Download BC.EXE (zipped, with source code) and study how the boom correction varies with the input data. Then change the INPUT.BC file to produce the boom corrections for your next yagi project. NOTE THAT THERE IS AN ERROR IN THIS PROGRAM. IT CAN BE USED AT 144 MHZ ONLY AND SCALING TO OTHER FREQUENCIES HAS TO BE MADE MANUALLY!!!