The real scope bandwidth is around the 570 to 580 MHz for 2 channels of the four (anyone of the first pair (1 or 2) and anyone of the second pair (3 or 4)), in this way you will have a 2 G Sample / sec ADC for each channel, and almost a 4 to 1 ratio.
And at 900 MHz you will have a -10dB attenuation on the signal.
I didn’t try high frequencies, because I don’t have any signal source so high, but one forum member said that for a 1 GHz signal at +13dB (1.4 V) sometimes didn’t a appeared reliably, so it sometimes appear, and he said that it must have a -20dB or more attenuation at 1GHz.
What I would like is that someone with a high frequency (1 GHz) and high accuracy single channel signal generator could characterize this scope front end in terms of amplitude and phase the frequency response of the scope. I propose a method a possible method in my previous posts and a reason to do it.
Best regards,
João Carvalho