Made by Viz Manufacturing, part# T-435A/AMT-4B. Frequency range of 1,660 to 1,700 MHz. A radiosonde is a unit for use in weather balloons that measures various atmospheric parameters (including pressure, temperatures and humidity) and transmits them to a fixed receiver. Measures 2-3/8" diameter at the bottom and 11/16" diameter at the top. The entire unit measures 8-1/8" long and has 4 pin male connector on a 15/16" diameter board and one single male connector as well. Unused. Sorry but we are not allowed to ship these outside the United States. Put one of these on your drone??
