Re: how to calculate SNR?
The S/N ratio is exceedingly difficult to measure without special (and very expensive) test equipment. For instance to test for S/N ratio could cost in the region of £25,000 for the equipment. A less expensive way is to introduce a special filter to exclude the video signal and measure the remaining noise, from which the S/N ratio can be calculated. However even this filter can cost in the order of £1,000. Neither of these methods are practical in the field on actual installations, even if the equipment could be afforded.