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Standard Antenna System Standard Antenna System 
Our standard antenna system produces a signal intensity of 2.0 mV/m at 1.5 km, the FCC maximum field level. That signal is typically strong enough to erect signs for alerting listeners at 3 to 5 miles. The antenna may be mounted atop a square or round pole of wood, metal or fiberglass. This antenna system is packaged with a factory-wired groundplane, pole mounts and insulators, a cabinet-protected lightning arrestor system and ground bus for lightning dissipation and groundplane connection. Components include . . .

Antenna Mount and Insulators

A galvanized-steel mount allows the antenna to be attached to any type of pole, minimum 6" diameter or 6" square. Includes split-plastic insulator mounts and stainless-steel hardware.

Lightning Arrestor, Enclosure and Ground Bus

Provided in a NEMA-4 cabinet, the lightning arrestor is bonded to an aluminum panel, which serves as support for lightning grounding and groundplane connection clamps.

Groundplane

A groundplane is the copper wire part of the antenna system buried beneath the antenna support. Our preassembled PowerPlaneTM Groundplane is placed in a 6"-to-12" excavation that extends outward 10 to 20 feet (depending on frequency) in all directions from the pad or pole base; it is covered with backfill. The groundplane consists of a central ring of #4 bare copper stranded wire with 62 radials that extend outward in a circular pattern. See how it's typically installed in this TechTalk article.

Specifications
Antenna
  • Type: whip (vertically polarized, center loaded, base fed).
  • Power rating: 25 watts.
  • Length: 15 to 25 feet (specifications vary with frequency of antenna).
  • Weight: 8 to 12 pounds (specifications vary with frequency of antenna).
  • Wind rating: antennas 1230 kHz and above 100 mph, 80 miles per hour with ¼ radial ice; antennas 1220 kHz and below 80 miles per hour, 50 miles per hour with ¼ radial ice.
  • Assembly: 4 sections - base, coil, midtip and tip.
  • Position of loading coil: center section.
  • Joints: sleeves with locking. screws, sliding tip with locking nut.
  • Temperature: -40 degrees C to 85 degrees C.
  • Base pipes: aluminum construction, black finish color to discourage ice buildup; UV-resistant finish; architectural-anodization process #801; 1.5-inch diameter.
  • Coil: wound with copper enameled wire in white vinyl shrink tubing, 2-inch diameter.
  • Adjustable tip: stainless steel with locking nut, adjustable for SWR optimization, 0.5-inch diameter.
  • Includes written documentation of safe RF exposure distance per ANSI/IEEE C95.1-1992 standard by a professional engineer (PE).
Lightning Arrestor System
  • Provided in a weatherproof NEMA4 cabinet, arrestor bonded to an aluminum panel that supports the lightning grounding and groundplane connection clamps.
  • Capacity of 50,000 amps surge.
  • Clamping speed of less than 2.5 nS.
  • 2 UHF connectors.
  • Aluminum flange ground connection.
Groundplane
  • Quantity: single PowerPlane Groundplane System.
  • Radials in system: 60 to 120 (specifications vary with frequency of antenna).
  • Radial length: 10 to 20 feet each (specifications vary with frequency of antenna).
  • Radial size: #12 bare solid copper wire.
  • Bonding method: silver solder brazing with double weather resistant coating.
  • Bonding ring size: #4 bare stranded copper wire.
  • Lead: #4 bare stranded copper wire, 10 feet.

Note: Our optional 2X Signal Booster offers up to double the efficiency/range of the station’s antenna, allowing the transmitter to run at less wattage or allowing the signal to have twice the signal intensity at a given distance. It functions with upper-band (typ:1610-1700) antennas only and is recommended for federal government agencies that do not have a signal intensity limitation; also for any operator in a challenging environment that requires maximum signal intensity to cut through woods, buildings and obstructions. (Local government licensees must seek a waiver of the FCC rules to allow a signal intensity above the standard 2.0 mV/m limitation.)

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