Do they make a device that scans rf frequencys?

Question

do they make device that scans rf frequencys and stops on the frequency that is in use at that time? Like lets say you press the button on your garage door could it tell me the frequncy it used to open it? what is it called?

Answer 1

Yes, they are called 'radio scanners' and are often used by thieves to try to capture codes and frequency's of remote locks, garage door openers, cell phones, and other radio devices. Modern remotes use rolling code or other encryption schemes to foil these attempts.

Answer 2

its called a frequency counter...
by the way garage door openers are at 315 Mhz, but you need to know the digital code to get your neighbors garage door open.
just break in through the window

Answer 3

the sea and air are very distinctive in comparison to your universal street. it rather is undemanding for a scanning gadget to pickup metallic in an ocean or a flying piece of metallic. the concern is that even however its undemanding on land, theres no way of telling whats a bomb and whats a frying pan or an eye fixed. interior the sea, you do no longer ought to truly complication approximately whether or no longer that soccer field sized piece of metallic interior the sea is a deliver or no longer.

Answer 4

1- radio scaner
2- circuit contains resons phynominon