Video BW

[manthan]

what is the meaning of Video bandwidh for rf detector?

[berkeman]

what is the meaning of Video bandwidh for rf detector?

It's more applicable to when you display the RF spectrum on a spectrum analyzer. Here is a good explanation of the different bandwidth terms in a spectrum analyzer:

http://dsnra.jpl.nasa.gov/technical/spectrum_analyzer/sweeptime.html

Does that help?