How do you calibrate a radar gun/unit?

[Aussie George]

"Radar? I don't have a radar. I just listened to the wind and the wind said, "45 man, nail him."" (or similar) Graham Greene from Thunderheart. :D :D

[Coastie 585]

How were they doing that?

Using the tuning forks then holding them in front of the radar. Each fork had the "sound" (I guess?) of different speeds. When they held it in front of the radar it would display the speed.

It was interesting, but how it works is beyond me. I assume all that the tuning forks do is show the officer that his radar is working correctly.

[Valor55]

Using the tuning forks then holding them in front of the radar. Each fork had the "sound" (I guess?) of different speeds. When they held it in front of the radar it would display the speed.

It was interesting, but how it works is beyond me. I assume all that the tuning forks do is show the officer that his radar is working correctly.

That's not tuning or calibrating. That's testing the accuracy of the unit. I described it in my first post in this thread. The vibration is creating relative motion that the unit is picking up on. Since it's a preset number for the tuning fork you know that the radar is operating properly when it matches. If it is off you know something is messed up.

[Coastie 585]

That's not tuning or calibrating. That's testing the accuracy of the unit. I described it in my first post in this thread. The vibration is creating relative motion that the unit is picking up on. Since it's a preset number for the tuning fork you know that the radar is operating properly when it matches. If it is off you know something is messed up.

Ahhh, didn't see your post. Good info though, thank you.

[txinvestigator1]

Traffic RADAR works by measuring the doppler shift. It transmits on a given frequency, and the "doppler shift" causes the returned frequency to be different. The radar unit displays the returned frequency as a speed reading.

The tuning fork resonates at a specific frequency; one that is stamped on the fork.

[Coastie 585]

Traffic RADAR works by measuring the doppler shift. It transmits on a given frequency, and the "doppler shift" causes the returned frequency to be different. The radar unit displays the returned frequency as a speed reading.

The tuning fork resonates at a specific frequency; one that is stamped on the fork.

Cool, thanks tx.

[citcop]

Here ya go....

http://www.escortradar.com/policrdr.htm

http://www.radarguns.com/how-radar-guns-work.html