Instead of inputting a start frequency, the number of steps, and the increments, we put in start and stop frequencies as well as the increment. The program translates the user input into the data needed for the FR card. The user can then print or save the data he may need. EZW normally operates in a single frequency mode, with a frequency sweep called up as a special function. Hence, sweep output data is selected by the user and placed into special files.
Frequency sweeps yield data at regular frequency intervals.
Very often, it is useful to transfer this data to a spreadsheet with graphing capabilities, since the data of interest can exceed the internal graphing capabilities of NEC programs. For most of the wider HF amateur bands, the start frequency is usually an integer, which makes the practice seem natural. We might generate a frequency sweep to determine the antenna's potential across the band from 7.0 to 7.3 MHz in 0.05 MHz increments. There is useful data in this graph. Note the smooth gain curve.