this plot, taken with a return loss bridge, spectrum analyzer, and tracking generator, shows the impedance match at the shack end of the feedline. the center frequency is 144.0 mhz and the span is 1 mhz per division. the return loss at the bottom of the band is 30 db, while it degrades to about 16 db at 146 mhz.
实际是如何操作de 呢?
