If the OEM specifications for the gun have a tuning range (example 24.150 GHz +/-200 MHz) or the service manual used in its certification has such a range, and the current frequency is within that range, there really is no argument. My biggest question would be the "certification" of the gun from the lab / technical facility that last certified it. Technically it can easily be argued that the gun is still plenty accurate for the task. Very small errors, and shifted up in speed, meaning the error is in your (the speeders) favor. So the "real" speeds of the original tuning forks at the new frequency are 30.25 MPH for the 30 MPH fork, and 55.45 MPH for the 55 MPH fork. Because at 23.950 GHz 55 MPH would be 3926 Hz of shift, and 30 MPH would be 2141 Hz of shift.
Using the original tuning forks all will show good. 3958 Hz of shift will still show as 55 MPH on the gun, and 30 Hz of shift will still show as 30 MPH on the gun. Now, if the gun is on 23.950 GHz the internal Doppler rate curve is still probably set for 24.150 GHz. The 55 MPH fork would be cut to produce a tone of 3958 Hz, the 30 MPH fork would produce a tone of 2159 Hz. It shipped with two tuning forks, maybe 55 MPH and 30 MPH.
#Side net radar frequency full#
For example, 55 MPH is 3958 Hz (rounding tones off to the closest full Hz here) of shift and 30 MPH is 2159 Hz of shift. The gun is internally configured so that Doppler rates match speeds at 24.150 GHz. There is probably not a certification that the gun is on or off freq, just that it performed speed measurement as required.īut lets look at the technical end of what happens when a gun shifts frequency and the officer uses tuning forks to check it.Īssuming the gun was originally on 24.150 GHz. If you go to court and anyone challenges the findings the police produce three documents, the log of daily, or watch to watch, checks done with the tuning forks, the documentation of the last time the radar gun was certified by an external lab or facility, and the officers certification / training to operate the radar. I believe an officer in the field just performs a tuning fork test, logs the results, and that is the daily, or watch to watch, check for operation. I will preface with, I don't know squat about the law concerning police radar usage, I have never been an LEO or in the police radar business, so below is all a guess.
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