The loss in RF coaxial cable increases substantially and quickly, when there is water intrusion. Coax that uses foam dielectric, like RG8X and LMR type coax, is particularly prone to this problem because the water can quickly propagate along the foam dielectric used in these type coaxes.
As we did with the Torqeedo electric outboard and Minn Kota trolling motor in past tests, Practical Sailor put the Solid Nav Traveler to work in sea trials on a Cape Dory Typhoon to determine whether it was a viable replacement for a small boats gas-powered outboard. The four-horsepower Traveler electric motor is marketed by Solid Nav and manufactured by Suzhou Parsun Power Machine Co., Chinas largest outboard exporter. Using a brushless 48-volt DC motor made by Mars Electrical Co. of Milwaukee, Wis., the Traveler combines a familiar drive train and an innovative solid magnet electric motor. At first glance, it looks like a small conventional outboard. Available in both long-shaft (20 inches) and short-shaft (15 inches) models, the Traveler is a gasoline outboard alternative best suited for a pocket cruiser (like a Cal 25) or similarly sized weekend cruiser where electric propulsion is desired. However, its required battery entourage limits its portability and affordability, and charging needs limit its practical use on smaller boats.
Recreational marine VHF antennas are usually broken down into three categories: 3- and 4-foot sailboat antennas (3dB gain), 8-foot powerboat antennas (6 dB gain) and 16-plus-foot, long-stick antennas (9+ dB gain) that are popular on larger, long-range craft. Antenna gain is a ratio related to an antennas effective radiated power (ERP) instead of a fixed quantitative value.
One of the often overlooked maintenance items in the pre-season rush to the water is the AC shorepower system. Over the years of surveying, Ive amassed a small collection of scary photos from past surveys showing the common examples of neglect to this critical system.
12Page 1 of 2