# Thread: What happens when 2 radar guns work on the same frequency?

1. ## What happens when 2 radar guns work on the same frequency?

What happens if two radar guns were to be within range of each other and were operating on the same frequency? Would they mess each other up? Would they jam each other? Would there be any effect?

In short, no, 2 radar guns won't interfere with each other.

3. Not a thing.

4. Wow, that is surprising.. :shock:

I figured if two were clocking in the same direction, that one could get a quicker bounce back thus a false reading...

Guess I would have figured wrong, eh?

5. Originally Posted by jimbonzzz

Long answer: Could cause a false speed reading on the officer's unit, maybe in one case in a million (if you're lucky).

Because of the doppler shift, the police radar guns are looking for the reflected signal to be a number of Hz or KHz off of the transmitted signal. Anything outside this range is basically ignored. So, one radar unit would have to be VERY close to the other one in frequency. Really about the maximum two units could apart in frequency for one to cause a speed reading on the other (stationary mode) is 21KHz @ 35.5 GHz and 200MPH. But in practice this almost NEVER happens. Most of the time, even two of the same model of radar unit are different in frequency by many MHz, since Gunn oscillators just aren't that stable, hence the +/- 100 MHz bandpasses. Even trying to tune two units to be this close to each other on purpose would probably be nearly impossible.

For example, if the officer had a K-Band radar unit at exactly 24.150000000 GHz, to display a false speed of 55 MPH on the police radar (stationary), your gun would have to be at 24.150003962 GHz. So, not too likely :cry:

BUT, if you happened to be legally operating your own licensed radar unit in the vehicle at the same time you were ticketed for speeding, this might make a good argument in court :wink:

Jim

6. Thank you jimbo. That solves that

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•