... advanced level 2.GPS Radiosonde 3.Digital technology GZZ2-07 series radiosonde are -1, -2 in two models, September ... have a narrow spectrum, frequency drift is small, output power, the answer pulse stability, and dynamic operating voltage range, ... % RH ≤ 5% RHElectrical properties: Transmission frequency: 400MHz ± 3MHz Transmitting power: ≥ 400mW Answer percentage: ≥ 50% Sub-carrier frequency: 32.7kHz ...