HPR.0990 Antenna High Performance Antenna

HPR.0990 AM Antenna
Up to 270W, High Efficiency for Commercial Broadcast STA / TIS with Waiver

This 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 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. 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 (*)

Click here for a detailed product data sheet with optional accessories and the below illustrations.

Figure 1 of 4

Frequency Band	Max Carrier Power 125% + Modulation Peaks	2:1 VSWR Bandwidth
1500 - 1700 kHz	220 Watts	+/- 5.5 KHz
1100 - 1500 kHz	210 Watts	+/- 4.5 KHz
800 - 1100 kHz	200 Watts	+/- 3.5 KHz
650 - 800 kHz	175 Watts	+/- 2.8KHz
530- 650 kHz	155 Watts	+/- 1.5 KHz

Figure 2 of 4

Figure 3 of 4

Figure 4 of 4

Typical HPR 0990 Vertical & Horizontal Radiation Pattern

(Feedpoint Elevated on 20ft Pole - 32 Radials [50ft] at Base of Support)

Related Links

Antenna Comparison Chart

Antenna Siting Recommendations

Radio World article: "ISS HPR.0990 AM Antenna Does a Quick Stand-In; Solving a problem for KNBI(AM) in Monterey.Calif." Dec 28, 2021.

The Source article: "High Performance Antenna Launches a New Era in Information Radio Broadcasting."

Examples

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).

This HPR.0990 Antenna (left foreground) is installed on a 10-story building in the heart of downtown Indianapolis.

The HPR.0990 Antenna (circled in yellow above) stands in as WJOI Norfolk’s tower is collapsed to make way for a new one.See "Tower Down! Norfolk's WJOI Maintains Operations with Quick Switch to New HPR.0990 AM Antenna," The Source, Sep 2019.