The frequency prediction of skywave propagation in shortwaveband is the precondition of performance prediction of skywave communication circuit.
短波天波传播频率预测是短波天波通信电路性能预测的前提。
2
Follow these simple plans to build a multiband shortwave antenna and be on your way to world band radio excitement!
按照这些简单的计划，以建立一个多波段短波天线，并在您的方式为世界的波段收音机兴奋！
3
For more efficient use of shortwave broadcasting band and improvement of broadcasting quality, single sideband broadcasting has been placed on the agenda.