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First measurements on the industrial prototype have shown no appreciable performance degradation with respect to the lab protot ype.

This paper presents the Italian experiences and results concerning that field as part of the AADCC (Aperture Array Design Construction Consortium) with particular reference to the technology of the sensor type Vivaldi.

Hexacopter in operation RA--INAF Low Noise Amplifier A distributed receiver system has been designed for Aperture Array Verification System (AAVP) facilities.

It can work with both antenna prototypes, Logperiodic or Vivaldi, and different cabling options, optical fibers or coaxial cables.

Basically the receiving chain has been studied considering four main parts: Long wave--length single mode VCSEL samples.

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Bianchi (1), A. Mattana (1), G.

Naldi (1), G. Pupillo (1), G.

Tartarini (2 ), S.

Rusti celli (2), G.

This paper presents the Italian experiences and results concerning that field as part of the AADC C (Aperture Array Design Construction Consortium ) with particular reference to the technology of the sensor type Vivaldi.

INTRODUCTION The Italian interest toward SKA is rapidly increasing.

Beside the inv olvement of th e rad io astronomical community, the engagement of a wide spread community of astronomers, phys icists and engineers, both for scientific and technological aspects, is becoming a solid reality.

INAF is active in promoting the involvement of the best national industrial capabilities to provide a qualified support to the project.

Some of the main current technological activity is high lighted here.

Moreover, involvement in tasks of several consor tia is under way.

VIVALDI ANTENNA The dual - polarization Vivaldi antenna is one of the most interest ing configurat ions (see Fig.

SKA low - frequency Aperture Array 123 (AA - low) instrument.

It provides a suitable matching level from 70 to 450 MHz (and more).

The isolation between the two or thogonally polarized channels (equal to the cross polarization at zenith) is m ore than 45 dB owing to the symmetry of the antenna.

The sky coverage is consistent with the 45 from zenith requirement.

The electronics of the front - end, i.e.

LNA and optical transmitter can be packaged insid e the antenna thickness in order to obta in a low - cost easy - deployable structure with an optical output.

Solar panels can also be added to achieve a self - powered solution.

Recently, the performance of the Vivaldi element has been further improved using a design strategy based on both the Cortes model 4 for a fast ev aluation of the sensitivity and the In trinsic Cross - Polarization Ratio ( IXR ) parameter for polarization purity 5.

Minimum s ensitivit y value s of 10 -3 m 2 K for each polarization and IXR values higher than 20 dB in the overal l sky coverage have been obtained 6.

Figure 1:VivaldiVer1.0 (left) Vivaldi3.

Antenna Industrialization Studies on the antenna industrialization, aimed to reduce costs and mechanical com plexity, are ongoing.

A low cost version (200 each for 256 pieces), based on aluminum composite panels and preformed frame border profiles, was engineered by Cospal Composite and Sguinzi industri es (see Fig.

Consequently, the assembly time drops from about an hour to a few minutes.