Raytheon Marine Offers Line Of Commercial Doppler Speed Logs
A complete line of commercial doppler speed logs is now available from Raytheon Marine Company. The doppler speed logs, which are manufactured by Raytheon Company's Submarine Signal Division in Portsmouth, R.I., will be sold and serviced by more than 250 authorized Raytheon marine dealers around the world.
According to Raytheon Marine Company president Dick Warden, the sales agreement will make an a l r e a d y well-accepted product more accessible to the marine community. "We've worked very closely with our sister division in Portsmouth for years," he said. "Now, with the growing popularity of our commercial radar systems and the recent introduction of our anticollision unit, we feel we're in an excellent position to broaden our lines and offer the doppler s y s t e m s t h r o u g h our dealer network. It's a move toward g r e a t e r m a r k e t i n g efficiency." The Raytheon doppler speed log line currently ranges from the Model DSL-250, a basic speed log which measures speed ahead and astern, to a dual-axis navigation system with docking capability. The solid-state digital systems are designed to be easily adapted to the broadest range of vessel applications. More than 100 systems of various configurations are now in use aboard tankers, high-speed cargo carriers, research ships, and destroyer-type vessels.
For speed measurement, all systems bottom-track to 1,000 feet (330 meters), and automatically shift to water-mass tracking at greater depths. At speeds above 10 knots, resolution is 0.1 knot. At speeds under 10 knots and in water depths of less than 250 feet, a "mooring mode" provides speed accuracy to 0.01 knot.
A depth indicator and adjustable depth alarm are standard on all systems. Depth display resolution in mooring mode is 0.1 meter. All models also include a feature for testing circuits and lamps.
The Model DSN-450 dual-axis navigation system simultaneously measures and displays ahead and astern speed, athwartship speed, distance-run, and depth. To aid the maneuvering and docking of very large ships, this system can be expanded to measure athwartship speed and depth at the stern, as well as dual-axis speed and depth at the bow.
Data is displayed numerically by all systems on an integrated bridge console. Remote digital and analog speed displays are optional. All models are designed to provide accurate speed data to true motion radars, satellite navigators, advanced collision avoidance/navigation systems and other shipboard integrated navigation systems. R a y t h e o n doppler speed logs utilize bottom and w a t e r - m a s s tracking technology. Speed measurement is based on the doppler effect, which is the difference in frequency between signals transmitted to the bottom or watermass and their return echoes.
A d d i t i o n a l information and complete specifications can be obtained from Stanley L. Clark, Raytheon Marine Company, 676 Island Pond Road, Manchester, N.H. 03103.