At broadcasting stations about 200 to 250 employees (technicians) are potentially exposed to radiofrequencies from the antennas (medium wave: 526.5 kHz – 1.6065 MHz, bandwidth 9 kHz, or short wave: 3.4 MHz – 26.0 MHz, bandwidth 5 kHz).
The latter takes advantage of a closed-form solution of Maxwell's equations to describe the antenna-medium system.
The antenna-medium distance is 10 cm, and the radar wave velocity into the medium is 12 cm/ns.
The antenna-medium distance is 10 cm, and the radar wave velocity into the medium is examined in the range from 8to2020 cm/ns.
The antenna-medium distance is 10 cm; the radar wave velocity into the medium is 12 cm/ns; the TX-RX distance is 14 cm with the azimuth oriented in the y-direction.
The antenna-medium distance is 10 cm; the radar wave velocity into the medium is 12 cm/ns; the TX-RX distance is 14 cm with the azimuth oriented in the -direction.
With the expected shift towards steerable antennas with medium or high gain, the antenna pattern has a much higher influence on the effective channel between the transmitter and receiver.
The air gap that separates the antenna from the medium generates a situation where the migration velocity field varies vertically even if the medium is homogeneous.
Two methods have been considered (rms and LLNL) for migrating data collected with air-launched antennas where the air gap that separates the antennas from the medium generates a situation that requires a vertically variable migration velocity even if the medium is homogeneous.
Results show that for an adequate number of active antennas and for medium to high-rates AGSSK-TOSD, is the preferred transmission technique for the examined scenarios.
These include, for example, the use of orthogonal codes (code division multiple access, CDMA) [11], frequency multiplexing (frequency division multiple access, FDMA), directional antennas (spatial division medium access, SDMA) [12], orthogonal frequency-division multiple access (OFDMA) [13], and time division multiple access (TDMA) [14], among others.
