There are others that say that monitoring your envelope pattern isn't good enough, if you have a scope... you should be watching the Trapezoid pattern, instead.
One problem with monitoring the trapezoid pattern all the time is that it will burn a dark vertical line onto the face of the scope tube, where the unmodulated carrier appears. The trapezoid pattern is useful for indicating the linearity of the modulated stage, but the envelope pattern gives a better idea of the actual quality of the signal, since flat-topping and waveform distortion are easily apparent.
The evelope pattern will burn a horizontal line where the bright no-signal baseline appears, if you don't disable the scope when not transmitting. This can also be a problem with CW and SSB operation, since the bright baseline is there during pauses in modulation or keying, just as the vertical line is there during pauses in AM modulation when using the trapezoid pattern.
Don, K4KYV _______________________________________________________________ This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
