PURPOSE: The FG2-DD series ‘No ground plane” (NGP) CB antenna kits were specifically designed to solve the lack of ground plane (counterpoise) problems found on vehicles constructed of plastic, fiberglass, wood or aluminum. This includes, but is not limited to, motorhomes, boats, automobiles and 18-wheeler trucks. Ground plane problems typically show up in the form of high standing wave ratio (SWR) and poor performance. The isolated ground plane that is built into the FG2-DD series kits will also alleviate problems on metal base vehicles that lack the sufficient ground plane for proper operation. This could be due to the size of available ground plane (ATV, bicycle, motorcycle, wheelchair, etc.), or because the operator chooses to mount the antenna in a location that is unable too properly take advantage of available ground plane. The FG2-DD series kits are designed for mounting on a flat horizontal surface. They are the ideal choice for motorhome roofs, the deck of a boat, the roof of a pick-up camper or cap, the trunk deck of a Corvette, or the roof of a fiberglass or aluminum 18-wheeler tractor. The installed height above roofline, including the spring and antenna is just less than 29 inches (737mm).
ANTENNA: The antennas used in these kits utilize the same 5/8 wave as the patented Firestik II tunable tip antenna. The antenna’s frequency is altered in order to maintain a desirable center band position when used with the tuned coaxial feedline. Accordingly, these antennas may only be used with the Firestik NGP cable. The core material is a 3/8-inch (0.375″ or 10mm) diameter reinforced plastic (fiberglass). Our custom blended formula offers a preferred balance of flexibility and strength. The chrome plated machine brass mounting base has standard 3/8″-24 threads. A high efficiency, voltage increasing helical wind is utilized. Heavy insulated copper wire is used to guard against shorted coils and corrosion induced resistance commonly found on non-Firestik brand antennas. The antenna used in this kit has our patented “no tools required” tunable tip for fast and easy SWR adjustments. The rated maximum wattage for the antenna in this kit is 100 watts. Each antenna is covered with a static reducing, heavy PVC shrink tubing with both pigment and UV stabilizers mixed in. Available colors are black or white with a red tip or, red or blue with a white tip.
COAXIAL FEEDLINE: The seventeen-foot (5.2 M) coaxial cable used in these kits is of the highest quality. As a matter of fact … our NGP cable assembly utilizes a custom manufactured coaxial cable that can only be found at Firestik. Unable to find the performance characteristics in any of the commercially available coaxial cable … we designed our own. First we use a multi-wire stranded center conductor to the prevent breakage that can occur with solid center conductor cable. A condition known as “cold working” occurs where vibration is present and this action can cause solid conductors to become brittle and eventually break. Surrounding the center conductor is a long life, flexible, polyethelene insulation. Since shielding is extremely critical on NGP systems, we used a double shield around the center conductor. First, a 100% aluminum tape covers the center conductor insulator and then a copper wire braid (averages 95% coverage versus the industry standard of 70%) is applied over the aluminum tape. The coaxial feedline, besides being the conduit for the signal to reach the antenna, serves as a tuned circuit that creates the necessary counterpoise. If a longer cable length is required, the user may add standard RG-58 A/U cable between the radio and system cable, preferably in lengths that are multiples of nine feet. Because it is a tuned circuit, the length cannot be reduced without causing non-repairable damage. Should the cable become damaged, order replacement cable model K-8NGP.
MOUNT, SPRING AND HARDWARE: To compliment the quality of the antenna and feedline, the exposed outer mounting disk is made of stainless steel and includes a rubber sealing gasket. A stainless steel spring with machined brass ends acts as the coupling between the antenna and the feedline.
ADDITIONAL FEATURES: Each kit includes a FREE microphone hanger. Complete instructions also included.
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