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DATA
SECURE RADIO
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overview |
The DFH-22 Series Federal Highway Band Radios offer a number of advantages for Departments of Transportation across the country.
 Licensing
The FHWA purchased the 220/222.5 MHz band from the FCC with the purpose of offering it for use by State DOT's. Since the 220/222.5 MHz band is now owned by the FHWA there is no licensing required with the FCC. This eliminates as much as 6 months of waiting time to use an FCC frequency. Registering with the FHWA can be as simple as faxing a request to the FHWA, then filling out and returning the registration form. In as little as 24 hours the FHWA will respond indicating which of the 5 frequencies the DOT is authorized to use. The user simply turns the dial to that number (1-5).
Mobility
Once authorized, the DOT can move message boards, sensors, or other devices at will. The most that may be required is a call to the FHWA to verify that the frequency is still optimal in that part of the state.
Range
Because 220/222.5 MHz is a very low frequency range these radios offer extremely long range. With the appropriate antenna, height and terrain, 60-mile coverage diameters can be achieved. Through the use of repeaters an entire county or state can be covered.
Flexibility
The DFH-22 Series of radios can be used in analog, on/off, digital, data modem and other configurations. They can receive signals from sensors such as Queue detectors, Fog sensors, Flooded Road detectors, Overheight Vehicle detectors, etc. They can send signals to ITS Command Centers, Message Boards, Ramp Meters, HAR and CB Radio Transmitters, etc. The DFH-22 Series can be used as individual items at a single site or as part of an entire ITS System. A GPS option is also available to help the user keep track of where his devices are.
Cost
Since radio usage has no recurring costs (unlike cellular, T1, or other dedicated telephone lines) the DFH-22 Series of radios can be a very cost effective, flexible and mobile solution to your communications needs.
 OVERVIEW
OPERATION
SPECIFICATIONS
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