单词 | block-grid keying |
释义 | block-grid keying [`bläk ´grid `kē·iŋ] COMMUNICATIONS Method of keying a continuous-wave transmitter by operating the amplifier stage as an electronic switch; during the spacing interval when the key is open, the bias on the control grid becomes highly negative and prevents the flow of plate current so that the tube has no output; during the marking interval when the key is closed, this bias is removed and full plate current flows. |
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