Does your place of business or residence have a beautiful drive and need a gate to match? Or perhaps you are in the market for a more utilitarian automated security gate. Carnahan-White Fence Company and their partners at D&J Automatic will help you on your way with one of their swift, professional installations. With experienced professionals heading up this Southwest Missouri gate installation company, D&J Automatic is equipped to handle any job from a small residential operator to a full commercial installation. Their knowledgeable staff are ready to assist you during the entirety of the planning and design process, and leave you thrilled with the resulting gate and operator project.

Our professionals know that one size does NOT fit all. The functional gate that is put in so delivery drivers check in with a store manager before dropping off a shipment is not the graceful, welcoming wooden or wrought iron structure that you would prefer to see at the end of your drive. Our experienced team will discuss with you precisely what you are seeking to construct, before we get to work designing and installing an automated gate made to your exact specifications. The Carnahan-White and D&J Automatic professionals pride in our work and want you to take pride in it, too. Using one of our state-of-the-art gate operators, we will have you opening doors in no time. Read below for further information about the specific systems we employ in our installations.

LA400 – Residential DC Linear Gate Operator

The LA400 has a powerful 24VDC motor, which provides exceptional starting torque and features soft start/stop operation. This promotes longer gate and operator life, as well as dependable performance. The LA400 is capable of operating gates up to 16 ft. long and weighing up to 550 pounds.

An on-board radio receiver is included with the LA400. Exclusive from Chamberlain, this provides a single remote control solution for gates and additional access points.




  • On-Board Radio Receiver
  • DC Operator System
  • Battery-Run System
  • Slow Start/Stop
  • Inherent Obstruction Sensing
  • External Obstruction Sensing
  • Control Inputs
  • Bi-part Latch
  • Timer to Close
  • LED Indicators
  • Electronic Limit System
  • Keyed Manual Disconnect

Owner’s Manual PDFLA400

Owner’s Manual Addendum PDFLA400 ADDENDUM

ROBOSWING R900 – Residential Swing Gate Operator

The RoboSwing is our most advanced swing gate operator for single family residences and residential complexes up to 15 units. Designed for super-quiet operation, it can handle up to 250 cycles per day with gates weighing up to 400 lbs. and up to 16 feet in length.

Unlike other systems, the RoboSwing is designed with a “non-scissor action” swing arm to greatly reduce the risk of injury. What’s more, the system features a DC motor with a 12-volt, 7-amp hour battery for dependable operation, even when the power goes out. Plus, this system helps to simplify installation by allowing installers to use low-cost, low-voltage wiring or an optional solar panel for operator use in remote locations.


  • Permanent magnetic 12-volt DC motor
  • Battery Backup
  • Built in radio receiver
  • Ultra-quiet operation
  • Added surge protection and spike suppression

Owner’s Manual PDFRoboSwing