高频雷达工作在十分拥挤的短波波段内，可资用的能满足信号调制的连续频带很难获得。
Operating in the heavy congested SW band, it is difficult for HFradars to find continuously useable waveband for signal modulation.
随着无线通信技术的飞速发展，无线电台的短波波段已经越来越拥挤，相互之间的干扰也变得越来越严重。
With the rapid development of wireless communications technology, short-wave band radio has become increasingly crowded, mutual interference has become increasingly serious.
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