"I repeat my advice that keying characteristics must be evaluated in the FREQUENCY domain (as occupied bandwidth), NOT in the TIME domain (oscilloscope). The reason has been stated here many times -- it's not only the TIME of the transition that determines bandwidth, it is the SHAPE of the transition from off to on and on to off that matters, NOT the time it takes, and this cannot be seen on a scope."
The frequency domain will have no information (other than lack of signal) until RF is generated. A spectrum analyzer cannot be used to determine the timing of the various switching events during CW keying. It can only provide useful information while RF is being generated. Your post was in reply to "Thanks for the scope shot and info. I compared the waveform to the QST K3S review, which seems to show a little over 10ms before RF appears. Is this because they used different settings?" This appears to relate to the timing of the switching events not to the characteristics of the RF itself. I think the oscilloscope is the right instrument for this measurement. I would submit that both a 'scope and a spectrum analyzer are required for a full evaluation of keying characteristics. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
