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Navigation/Communication Equipment Review — Japan Radio (continued from page 35) the most demanding marine en- vironment, according to Edward B. Campbell, manager, industrial electronic services marketing, RCA Service Company. "It com- bines keyboard channel selection with automatic scanning and cov- ers all U.S. and International Channels," Mr. Campbell said. A key feature of the unit, he pointed out, is the programmable microprocessor that allows up to 20 channels to be automatically or manually scanned for traffic in particular situations, such as negotiating harbors patrolled by Vessel Traffic Systems. Other fea- tures include 25-watt transmitter output capability and a receiver design that assures crisp signals even in congested harbors. "The 8080 is U.S.-built with integrated circuit technology and corrosion-resistant materials to withstand the most rugged ma- rine conditions," Mr. Campbell said. "The unit is ideal for com- mercial fishing vessels, work- boats, large yachts, and deepsea vessels." For additional information, Write 42 on Reader Service Card REGENCY ELECTRONICS ENVIROVAC Vacuum Sewage Collection and Holding Systems. The Quality Leader in Marine Sewage Units. You'll find ENVIROVAC on Coast Guard and Navy ships. On big and small commercial vessels. And on hundreds of other marine installations the world over. The key to the success of the ENVIROVAC System is its use of air instead of water for the trans- portation of sewage. In quality comparisons, the superiority of the ENVIROVAC Vacuum System is readily seen. • ENVIROVAC systems use less water. Only 3 pints of water per flush, or about 2 gallons per crew member per day. • ENVIROVAC reduces holding requirements. The vacuum toilet allows the vacuum collection/ holding tank to be up to 90% smaller than equivalent gravity holding tanks. • ENVIROVAC systems are easy to operate. Unlike treatment plants, the ENVIROVAC system does not require the addition of special chemicals, or the testing of the effluent. No special operating skills or specially trained personnel are required. • ENVIROVAC systems have vitreous china toilets and all wetted parts that are made of non- corrosive materials. • ENVIROVAC systems are easy to install. Because the _ vacuum toilet can discharge horizontally or vertically, total freedom of placement of the toilets and system com- ponents is possible. Piping can be run around and under bulkheads and decks. • ENVIROVAC systems are U.S. Coast Guard approved U.S.C.G Certificate No. 159.15/1016/1/111. Get the quality difference story on ENVIROVAC Vacuum Sewage Systems, today! ENVIROVAC 1260 Turret Drive, Rockford, Illinois 61111. Toll free (800) 435-6951. Write 175 on Reader Service Card Regency Electronics, Inc., In- dianapolis, Ind., has announced a new concept in Marine Direction Finders — the Polaris NC7100. The unique feature is a circle of 36 light-emitting diodes that scan for a VHF signal, then point to the position of a transmitter with plus/minus 5-degree accuracy. Two adjacent lights alternately flash to indicate a more accurate bearing. The Polaris NC7100 can deter- mine position by triangulating be- tween two coastal transmitters. Or, it can get a bearing on coast- al VHF marine or weather sta- tions. All entries are made by just touching the back-lighted pressure pads. The Polaris NC7100 uses a spe- cial dipole array antenna that is custom-designed with a circuit board that can detect direction and eliminate 180-degree errors, and it is built to hold up to 100- knot winds. Other features in- clude a switch to hold the direc- tion finder on the last bearing, memory lock, channel 16 switch, rugged external speaker, and channel 16 priority. A special direction-finding receive antenna is included. For further information, Write 43 on Reader Service Card RF COMMUNICATIONS The RF-2330 channelized ARQ system from Harris Corporation's 40
