As for SA/FFT record length - what if you set small span in VHF range while at max 10k points - what RBW you get? For example 1MHz span, 100MHz CF.
It's hard to say. I don't have a 100 MHz source. It claims a RBW of 1 KHz. The update rate is really poor. From the appearance of the display I think the actual RBW is 10 KHz. In the normal FFT mode with 1 Mpts (no zoom), the RBW is nominally 1 KHz. With zoom it drops back to 10 KHz.
I've got a Feeltech FY6660 on the way. When it arrives I'll try 50-60 MHz. The Instek sine is limited to 25 MHz. To go higher I'll need to get my HP 8601A or ADF43XX going.
I don't understand how they are doing the restricted span. All my work with FFTs has been in recorded time on seismic data and well logs. But it appears that the SA mode is just a better interface for a zoom of the regular FFT with some additional averaging of the FFT spectrum.
I've been in touch with Instek about being able to choose the X & Y channels. I want to characterize some magnetic core material. To do a hystersis loop I need to plot the current against the integral of the voltage across the coil. Damn nuisance to have to dump a CSV file to a PC to do it. But easier than building a 200 MHz integrator.
With a 10 Mpt record sampling at 1 GSa/S one has an RBW of 150-200 Hz (100 Hz nominal).
Most hams are active in HF through 2 meters though 70 cm has become popular with the advent of dual band VHF/UHF handsets.
So with good software the 2000E series could be a huge hit with DIY hams.
I'll take a look at the other thread.