On Tue,3/29/2016 1:03 PM, Vic Rosenthal 4X6GP/K2VCO wrote:
The relationship of bandwidth and speed is that for given rise/fall times, increasing speed will reach a point when the code elements blur together.
Yes, but that's RX bandwidth, VERY different from occupied bandwidth. The issue is RX bandwidth is the TIME (phase) response -- every change in amplitude is accompanied by a change in the phase response, that that phase distortion (remember, phase is time) blurs the code elements together.
So you need more bandwidth for super high-speed CW because you need to shorten the rise and fall times.
You need more RX bandwidth, for the reason described above.
But the occupied bandwidth doesn't change as you vary the speed.
Right. Occupied bandwidth is your "footprint" on the band -- how much your signal is spread out.
73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
