Red Sox player swinging a bat,

Speed Guns FAQ

No, Doppler radar can only read the relative speed of targets moving either to or from the radar.



A 12-degree angle should not affect performance. The Speedster can achieve +/- 1-MPH speed accuracy to a baseball at 75 feet away at a 12-degree angle or less. A 20-degree angle at 60 feet away would result in +/- 3-MPH accuracy.

The Bushnell Speedster provides +/- one-MPH speed accuracy.

The Bushnell Speedster is water resistant and performs +/- one MPH accuracy in rain and snow. Weather does not affect accuracy and it is self-calibrating.

Once the trigger is engaged, the Speedster transmits radio frequency energy in the form of waves. The radar transmits 24 billion RF cycles of energy per second at the speed of light, which is 186,000 miles per second. The Speedster measures the difference between transmit and receive signals and relays this information to the DSP to quickly calculate +/- one MPH speed accuracy.

The Bushnell Speedster works best when positioned in front of or behind a moving object.

Speed is the difference between the transmit frequency and receiver frequency (also known as the "Doppler" shift).

No. However, if you would like to know the speed of the vehicle you are in, point the Speedster at a stationary object, such as the ground.

Radar is an acronym for "Radio Detection And Ranging".

Approximately ten 9-inning baseball games.

The Bushnell Speedster can be used to accurately measure and display speeds of many of your favorite sports. It can track speeds of baseballs, softballs, tennis balls, and can be used in ice-skating, auto-racing, horse-racing, track, and other sports where speed is crucial to success.

0-75 feet away.

0-1300 feet away.

The Speedster uses advanced Digital Signal Processing (DSP) software to filter out bad information, providing valid accurate information. In addition, the Speedster is capable of tracking baseball statistics.

-5 degrees C to 70 degrees C.

The Bushnell Speedster contains a K-Band microwave RF (Radio Frequency) transmitter whose signal gets reflected by the target object. The reflected signal will have a "Doppler Shift" proportional to the target speed. This Doppler frequency shift is detected in the receiver, amplified, filtered, and then digitized in an Analog to Digital Converter (ADC), and passed onto the Digital Signal Processing (DSP) chip. Using complex algorithms, the DSP chip filters out false and low level return signals, to identify and display the speed of the desired target. The speed along with various statistics and averages are then displayed on the LCD display.

Six AA's. We recommend using good quality AA alkaline batteries.