Read C:\WordPerfect\ComSiteMPE\MPE_Calculator.wpd text version

MPE Calculator The MPE Calculator is a "back-pocket" calculator which provides a quick method of calculating MPE levels for a single antenna. You can select Near/Far field modeling based on the particular MPE Standard selected. The results are displayed and the background color for the General and Occupational MPE levels reflect various exposure zone classification colors.

To access this form, select Tools from the Main Menu and select MPE Calculator. Each Item displayed on the screen is described below: Antenna Gain: Gain in dBd. This value is only needed for Far Field calculations. Antenna Length: Length of antenna aperture (radiating element). This value is only required for Near Field calculations.

Antenna H Beamwidth: The horizontal beamwidth of the antenna. If it is an omnidirectional antenna, the value would be 360 degrees. For panel or directional antennas, it would be the manufacturer specified value. This value is only required for Near Field calculations. Antenna Input Power: This value should be the transmitter power level after all filter/combiner and transmission line losses are deducted. This is the actual input power level to the antenna. This value is required for both calculation modes. Transmit Frequency: Operating frequency of transmitter in MHz. This value is required for both calculation modes.

Antenna Height: The radiation centerline of the antenna referenced to the same horizontal plane as the Observer Height. The horizontal plane could be ground level or roof level. Observer Height: The height of the observer (typically 6-feet/one-meter) referenced to the same horizontal plane as the Antenna Height. The horizontal plane could be ground level or roof level. Observer Distance: Horizontal distance from Antenna to the Observer location as measured on the same horizontal plane. If the observer height is different from the antenna height, the MPE Calculator will automatically calculate the actual "slant" distance from the antenna to the Observer. Standard: This is a drop-down list box that allows you to select a MPE Standard for the General and Occupational MPE levels. MPE Zone Legend Color: This legend indicates three different zone color codes. Calculation Mode: These option buttons allow you to select either the Near or Far Field calculation model. Power Density Units: If the Power Density level is below 0.00# milliwatts, the user can select the microwatts option button for ease of reading or if this unit of measure is preferred. Results: This frame displays the calculation results for the Power Density, General MPE and Occupational MPE values. The MPE values are displayed as a percentage of the maximum permissible emission levels based on the particular MPE Standard selected. The background color indicates the MPE Zone Color. Near/Far Crossover Distance: This is the transition point between Near and Far Field analysis models. This is provided to assist the user in determining which Calculation Mode to select (Near or Far). You must enter an Antenna Length for this to be calculated. Calc: This command button will calculate or re-calculate the MPE levels. Print: This command button will send the screen image to the default printer. Close: This command button closes the MPE calculator.

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