urn:nasa:pds:context:instrument:v15.roe 1.0 1.11.0.0 Product_Context urn:nasa:pds:context:instrument:roe.v15 2021-02-24 1.0 Changed inst LIDs from u:n:p:c:i:instID.scID to u:n:p:c:i:scID.instID And per "Guide toPDS4 Context Products" v1.7, changed all lidvid_reference to lid_reference urn:nasa:pds:context:instrument_host:spacecraft.v15 instrument_to_instrument_host unk reference.unk RADIO OCCULTATION EXPERIMENT Atmospheric Sciences not applicable not applicable Instrument Overview =================== Coherently related radio signals were transmitted by the spacecraft at wavelengths of 8 cm and 32 cm. These passed through the ionosphere of Venus before being received at the Evpatoria station (in the Crimean region of what is now Ukraine) of the Soviet Deep Space Communication Center. The standard equipment provided signal amplification, heterodyning, and filtering. Next, the received transmissions were fed into a dispersion interferometer, which used a closed-loop system to perform narrow-band filtering in order to isolate the desired signals. Amplitude and phase of both signals was recorded. Ionospheric electron densities were obtained from these data products using standard techniques for radio occultation experiments. The leader of the radio occultation experiment was N. A. Savich and one of the experimenters was A. L. Gavrik.