AMX TXC16 Plus Specifications download pdf (Page 99)

SG-2000 MANUAL 92

The SGC Building, 13737 S.E. 26th St. Bellevue, WA. 98005 USA

SGC does not endorse the use of artificial ground plates as a replacement for an

adequate bonding system. While such plates, generally made out of a porous

zinc alloy, provide some grounding, they are also subject to corrosion and

marine growth which reduces their efficiency. There is no substitute for copper

foil and lots of it!

On FRP (fiberglass) hulls, a good connection to the sea may be made by routing

foil as close to the hull as possible. When you have a large foil surface inside the

hull, separated from the sea water by less than 1/2,” a capacitor is formed. This

coupling is very effective. Remember, as far as RF is concerned, total area, not

D.C. continuity, is critical.

Metal hulls are great, but remember if you are dealing with an aluminum hull

that corrosion is a constant enemy. The best connections are welded to the

aluminum and cleaned frequently because aluminum tends to corrode in the

presence of dissimilar metals.

The best ground system is run down the chine, below the waterline, on either

side, plus a run down the keel, picking up the engine block and all tankage

possible in order to build a large surface area ground.

Hull (Top view) showing routing of 2 to 3" copper bonding strap

Coupler

Engine

Fuel and Water tanks

Bonding Foil

In addition to the large metal surfaces, you may also connect life lines and a

metal toe rail (if available) to the bonding system.

It had been common practice for several years to put copper screening in the

cabin roof and mount the HF antenna above the roof. While this worked well at

high frequencies, the lack of capacitive coupling to sea water and the relatively

small size of the ground surface, when compared with a large in-hull bonding

system, make the copper screening approach less desirable.

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AMX TXC16 Plus Specifications Page 99