A Radiosonde is a unit for use in weather balloons that measures various atmospheric parameters and transmits them to a fixed receiver. Radiosondes may operate at a radio frequency of 403 MHz or 1680 MHz and both types may be adjusted hydrocodone slightly higher or lower as required. RADIOSONDES Model Nber: RAD001 Contact us for more Details about our RadioSondes. email: gci@chinahong.com