Having a conceptional issue.
If a SDR dongle has a 2MHz signal bandwidth, but that can be anywhere within the range of 50-2000 MHz, why is the bandwidth only 2 MHz.
The clock must be double the highest frequency, whether this is 2000 MHz or a lower baseband signal after analog down conversion of that 2000 MHz. So why can't the bandwidth be higher than 2MHz.
Someone said the bandwidth 2Mhz is related to the clock, but I am thinking it's likely more related to the tunable filter size, and that is 2MHz because wider than 2MHz maybe too difficult on those dongle chip boards?
Thanks for any help or explanation you can give