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  HPR.0990
High Performance AM Radio Antenna

Maximum Efficiency Whip Design; up to 270 Watts
HPR Antenna 
The HPR.0990 High Performance Antenna is the heart of the RadioSAFE System.
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The HPR.0990 Antenna’s capacitive “Top Hat” design maximizes efficiency.
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The heavy-duty HPR.0990 Antenna Coil can handle hundreds of watts.
This high performance antenna offers a communication professional the ability to establish an AM broadcast signal more efficiently than before possible with an antenna of similar design and price point. Its 50-ohm resonant design requires only a matching transformer at its feed-point, eliminating the need for an antenna tuner (matching network). Designed to operate most efficiently in conjunction with a horizontal groundplane, this antenna is compact and light-weight, making it easy to ship, set up and install. It may be assembled in minutes, if required, for an emergency application.  
Frequency Range and Coverage 
Different versions of the antenna's design allow it to function on any frequency in the 470 to 1800 kHz range. Field tests prove that this antenna is capable of handling hundreds of watts, producing a coverage pattern that can exceed 20 miles in radius. 
Users 
  • Common users are emergency managers and associated amateur radio operators who want to reach their publics during times when power and other communications and internet services are compromised.
  • Commercial broadcasters can also benefit by using the HPR.0990 High Performance Antenna to keep their AM stations on the air temporarily at low power following calamities.
  • And amateur radio enthusiasts who want a solution for special applications that can be installed in confined spaces will benefit. 

See examples on the right. - - - > 

Upgrades
Information Radio Station licensees can easily upgrade to the HPR.0990 Antenna. The antenna’s efficiency will allow a 10-watt signal to be produced that is two to four times that of the standard antenna, depending on frequency. A waiver is required from the FCC if an Information Station’s signal intensity would exceed 2.0 mV/m at 1.5 km (0.93 mile) by substitution of this antenna. 
Licensing 
When utilized in association with an Information Radio Station for expanded coverage, i.e., RadioSAFE Wide Area Emergency Radio Broadcast Systems, a waiver and/or an emergency Special Temporary Authority (STA) from the FCC is required. Engineering and filings for the required waivers and STAs can be supplied by Information Station Specialists. 
Specifications (*)
  • Power: up to 270 watts carrier (1700 kHz)/100% modulation; up to 180 watts carrier (530 kHz)/100% modulation. See Table 1 below.
  • Frequency Range: Various versions of the antenna's design allow it to function on any frequency in the 470 to 1800 kHz operating range.
  • Impedance: 10-20 ohms (typical) with 50' tip height and 25-50' radius groundplane (typical).
  • Mounting Format: Top of support structure [tower, mast or pole]. Lower 36” of antenna base clamps in insulator mounts which can be attached to a vertical support with a round or flat surface.
  • Type: center-loaded, bottom-fed vertical, whip-type antenna with adjustable 6- element capacitive top hat and adjustable vertical tuning section . Omni directional. Anodized aluminum finish. Guying ring included.
  • Radiation Efficiency Range: 54 mV/m/km at 530 kHz & 171 mV/m/km at 1700 kHz, referenced to 1 KW. See Table 1 below.
  • Audio Bandwidth (2:1 SWR): 530 kHz: +/- 1.5 kHz; 1700 kHz +/- 5.5 kHz. See Table 1 below.
  • Temperature endurance: -40°C to 85°C.
  • Wind endurance: greater than 100 MPH, unguyed. Greater than 140 MPH with the addition of guy lines (nonconductive only).
  • Weight of the complete antenna varies with frequency. 30.5 lbs nominal. Mounts with insulators (2): 5.5 lbs total.
  • Overall assembly: five sections plus capacitive hat. Length varies with frequency and tip extension. Typical: 32'. Includes assembly hardware. Outside diameter of vertical sections taper from 2.5” (lower) to 1.0” (upper). Capacitive hat spoke length varies with frequency.
  • Recommended separation from buildings and structures: 100’ or equal to the height of the structure, whichever is greater.
  • Required: stand-off mounts with insulators. Options: matching transformer, lightning arrestor, weatherproof cabinets, coaxial cable with connectors, guying kit, support poles and masts, roof stands, fully assembled portable groundplanes.
  • RF exposure separation: 1 meter minimum recommended for both occupational and controlled environments.

(*) Specifications are subject to change without notice. You can download a printed version here.

Table 1 

 Frequency Band

Max Carrier Power
100% + Modulation Peaks

Max Carrier Power
125% + Modulation Peaks

2:1 VSWR Bandwidth

Antenna Efficiency
mV/m/Km 

1500 - 1700 kHz

270 Watts

220 Watts

+/- 5.5 KHz

151 - 173

1100 - 1500 kHz

250 Watts

210 Watts

+/- 4.5 KHz

111 - 151

800 - 1100 kHz

230 Watts

200 Watts

+/- 3.5 KHz

81 - 111

650 - 800 kHz

200 Watts

175 Watts

+/- 2.8KHz

66 - 81

530- 650 kHz

180 Watts

155 Watts

+/- 1.5 KHz

54 - 66

Table 2 

 
Table 3
Typical HPR 0990 Vertical & Horizontal Radiation Pattern

(Feedpoint Elevated on20ft Pole - 32 Radials [50ft] at Base of Support)
 
   
Examples & Links
Coverage Map 
From a building roof, the HPR.0990 antenna can produce coverage with 180 watts to 10 miles in radius (the 0.5 mV/m signal contour).
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See our Antenna Comparison Chart.

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HPR 10 Stories Up 
This HPR.0990 Antenna (left foreground) is installed on a 10-story building in the heart of downtown Indianapolis.
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The HPR.0990 Antenna (circled above) stands in as WJOI Norfolk’s tower is collapsed to make way for a new one.

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Read Radio World's article "ISS HPR.0990 AM Antenna Does a Quick Stand-In; Solving a problem for KNBI(AM) in Monterey.Calif." Dec 28, 2021.
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See who was using the antenna as of Dec 2021 in the article "High Performance Antenna Launches a New Era in Information Radio Broadcasting." The Source, Dec 2021.
   
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