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Inter-modulation corrector for HF single side band amplifier - has pre-corrector for odd order cross-modulations, whose amplitude is measured for analysis by microprocessor, and test signal generator
Inter-modulation corrector for HF single side band amplifier - has pre-corrector for odd order cross-modulations, whose amplitude is measured for analysis by microprocessor, and test signal generator
An intermodulation measuring circuit (13) is connected to the output of an HF amplifier (2). The measuring circuit output passes through an A/D converter (16) to a microprocessor (14) to which a logic interface (15) is connected. This allows communication with an operator and also enables the highest intermodulation order to be selected. This interface also allows a test signal to be applied via a gating circuit (19) to the input of a modulator (1). D/A converters (17) provide gain adjustment signals from the microprocessor to a pre corrector (4) upstream of the amplifier. The correction is initiated by an operator command and the correction signal is applied until the measuring circuit indicates that the intermodulation has reduced to below a threshold level.
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机译：互调测量电路（13）连接到HF放大器（2）的输出。测量电路的输出通过A / D转换器（16）到达与逻辑接口（15）相连的微处理器（14）。这允许与操作员进行通信，并且还可以选择最高的互调阶数。该接口还允许将测试信号通过门控电路（19）施加到调制器（1）的输入。 D / A转换器（17）从微处理器向放大器上游的预校正器（4）提供增益调节信号。通过操作员命令启动校正，并施加校正信号，直到测量电路指示互调已减小到阈值水平以下为止。
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