Can someone please explain the whole sin(x)/x issue to an oscilloscope-town n00b?
I see, that the displayed waveform in vector mode is not a connect-the-dots with straight lines, but an interpolation. Also, the sin(x)/x is greyed out as "on" in one and two channel mode and does not really do much with three, or four channels activated. (I can not see the difference)
I am probing the antenna of a PMR/Freenet dual channel handheld radio. The displayed trigger frequency does not make sense to me, but the measured values for period and frequency for the Freenet channels are plausible (6.7ns / 149MHz carrier) and even on 446MHz for the PMR carrier, at least the order of magnitude is kind of ok-ish (amplitude of course is nowhere near sane values, but then again this is way out of specs).
With all four channels activated, showing dots and persistence set to infinite, I see "slices" in the plot. As if the sampling is done in serial bursts per channel.
The measurements are way off, but to my understanding: Usable bandwidth on single channel is good up to 80MHz with a 10x probe, two channels more like 50MHz because of shared sampling and three / four channels up to 25MHz.
Most probably I am mixing up a lot of stuff here - please be patient, I am still trying to figure everything out
The "vector" plot looks a like a spline interpolation to me, so it is in fact a connect-the-dots, but with a curve instead of straight lines.
This is on software 00.04.04.01.01, board v. 0.1.4, boot v. 0.0.1.4, firmware 0.2.3.11, 100MHz option,... (just for reference)
Please enlighten me
Frederik