One fork simulates the patrol car speed, the other fork simulates a moving target reflection. Two tuning forks with different tones are required to test moving mode. ![]() Moving mode test is a little more involved and a little confusing. The fork's "side" must be facing the antenna to register a speed reading. Once the fork is vibrating place it a few inches in front of the antenna. To start the fork vibrating gently strike the top side against a hard object such as wood or plastic, not metal. Testing the radar stationary mode is straight forward, place a vibrating fork a few inches from the front of the antenna, the radar should read the speed the fork is calibrated to induce. For dual antenna radars, the test should be conducted on each antenna. Some places also require the test when a citation is issued, and/or at end of shift. The test should be conducted at start of shift, at a minimum. The forks should be labeled with, Speed, Radar Frequency, and Serial Number for tracking and accountability.Ī radar should be tested with tuning forks on a daily basis. The radar calibration certificate should include the tuning fork serial numbers that go with that radar. The supplied forks are the only forks that should be used to test the radar. The radar is measuring the microwave reflection of the fork or speaker diaphragm - a complete end-to-end test.Īll radars come with tuning forks tuned for that radar. A radar will also measure a tone from an audio speaker diaphragm.
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