scope:

The present document applies to digitally modulated Radiosonde transmitters and whole units in the range from 400,15 MHz to 406 MHz and with power levels ranging up to 200 mW. The present document shall not be applied to the presently widely used analogue FM Radiosonde transmitter.

The present document contains the technical characteristics for radio equipment referencing CEPT/ERC Recommendation 70-03 [4].

The present document does not necessarily include all the characteristics which may be required by a user, nor does it necessarily represent the optimum performance achievable. It is a product family standard which may be completely or partially superseded by specific standards covering specific applications.

The radio equipment, covered by Radiosondes, falls in the class 11a, based on the power designation given in the CEPT/ERC Recommendation 70-03 [4].

For non-harmonized parameters, national regulatory conditions can apply regarding the type of modulation, channel/frequency separations, maximum transmitter output power/effective radiated power, equipment marking and the inclusion of an automatic transmitter shut-off facility as a condition of the issue of an individual or general licence, or, as a condition of use under licence exemption.

The extreme temperature ranges are fixed and are given in clause 5.4.1.2.