| 摘要 |
A radio transmitter, comprising: a feedback loop ( 314 ) which feedback loop comprises a variable attenuator and a signal analyser, means ( 300, 302, 304, 306, 308, 310, 312 ) for transmitting a signal on a predetermined radio channel, means ( 308 ) for changing attenuation level and for attenuating the feedback signal, means ( 316 ) for defining power levels on the radio channel and on the adjacent channels, means ( 312 ) for analysing the power levels to generate first and second results of analysis and for comparing the first and second results of analysis, means ( 318 ) for delaying a transmitted signal to derive a reference signal, means ( 312 ) for comparing the feedback signal and the reference signal to generate an error vector and means ( 320 ) for generating a test alarm.
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