A radiosonde is a unit for use in weather balloons that measures various atmospheric parameters and transmits them to a fixed receiver. A frequency band[?] at 403 MHz is reserved for radiosondes.
The weight of a radiosonde is typically 250 grams. A major manufacturer is Vaisala[?] in Finland.
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... urethra is a tube that connects the urinary bladder to the outside of the body. The urethra has an excretory function in both sexes, to pass urine to the outside, and also a ...