Teradek User Guide

TOF.1 Rangefinder

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TOF.1 is a compact, affordable, and lightweight distance measurement device that is designed to work with Teradek RT devices. TOF.1 can be plugged into an MDR.X unit, communicating measured distance information to a Teradek RT CTRL.1 or CTRL.3 controller. The distance information can also be displayed on a compatible SmallHD monitor via a serial connection.


1. Remove the battery cap using the included Allen key, then insert three batteries with the positive (+) side facing out.
2. Unscrew the two top hex screws to remove the NATO rail mounting hardware from the laser pointer (see image below).

3. Attach the mounting hardware to the top of TOF.1 using the same hex screws (see image below).

4. Loosen the spring-loaded rail mount screw.
5. Attach the laser pointer to the mount, then tighten the rail mount screw (see image below).

5. Attach the TOF.1 Rangefinder to the appropriate rod or bracket.


  1. Connect power to MDR.X’s PWR port.
  2. Connect TOF.1 to MDR.X’s middle motor input using a motor cable.
  3. From the MDR.X, navigate to the RX CONFIG>RANGE FNDR menu, then select
    MID MOTOR. The rangefinder will begin communicating with the MDR.X.
  4. If you haven’t done so already, pair your controller with the MDR.X. Ensure that both devices are on the same channel and using the same units of measurement.
  5. From both the controller (CTRL.3 only) and MDR.X, navigate to the BUTTONS menu and assign the Display option (DISP) to one of the six buttons.
  6. Return to the main screen and press the DISP button until the Rangefinder information is displayed on both devices.


TOF.1’s sensor has a 3° detection angle that determines how big the detection circle is at any given range. As your target moves back and forth, the size of the detection circle increases and decreases. For example, if your target is 16ft (5m) away, the detection circle is approximately 10in (26cm) in diameter. NOTE: The illustration below is not to scale and is for reference only. 


  1. Before beginning the calibration process, ensure that your controller and MDR.X are paired, using the same units of measurement, and the AUTOFOCUS feature is disabled on the controller.
  2. Navigate to RANGE FNDR> CALIBRATE from either the controller or MDR.X.
  3. Point your camera and TOF.1 toward a flat object such as a gray target card or a wall.
  4. Use a measuring tape to determine the distance between your camera’s film plane and the object you’re using to calibrate.
  5. After measuring the distance, use the up and down menu buttons to adjust the offset so that the displayed distance matches the distance measured in step 4.


NOTE: Before enabling the Auto-Focus feature, you must create a lens map for the lens you are currently using, then select it for use with your controller. Refer to your controller quick start guide for instructions on how to configure a lens map.

  1. Point your camera and TOF.1 towards the measured distance you want in focus.
  2. From the CTRL.3 controller, navigate to RANGE FNDR> AUTOFOCUS.
  3. Select YES to enable Auto-focus. The motors will adjust the focus according to the measured distance.


SmallHD monitors include a Rangefinder Overlay feature that displays your TOF.1’s measured distance on the monitor. All you need is a SmallHD/Teradek RT interface cable. Below are steps to enable the Rangefinder Overlay.

  1. Connect a cable from the controller’s wired mode connector to one of the monitor’s AUX ports.
  2. Tap the screen and navigate to ADD NEW TOOL>OVERLAYS >Teradek RT, then select whether to add the rangefinder overlay to the current custom page or all custom pages.
  3. To configure the size of the overlay, tap the screen and select Teradek RT from the top left corner.
  4. Select Enable, then scroll down and select RANGEFINDER SIZE.
  5. Use your finger to move the slider left and right to adjust the size of the overlay. 
  6. Tap Teradek RT on the top left corner to return to the custom page. The Rangefinder overlay will display on the right side of the screen and will adjust according to the measured distance.
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