The Brazilian ANSP, CISCEA, launched a project for renewing the HF radio coverage over the Atlantic ocean by replacing obsolete radio devices installed in Recife, Belem and Rio de Janeiro and connecting the new ones to the Atlantic ACC VCS system. The radios will be initially connected to the CINDACTA3 technical room (in Recife) via TDM network. The project includes the possibility to be updated to operate through MPLS network.

The Recife VCS is in charge to grant automatic receiver and transmitter radio pairing, frequency tuning, squelch selection, SELCALL, ALE, etc. managing multi-site HF remote radio stations, each one configured with multiple transmitter and receiver equipment. The project includes the possibility of expanding the implemented architecture to allow interoperability with the military HF radio network.

The MULTIFONO® VCS systems by SITTI are natively capable of coping with the multi-site configuration required by this project, allowing radios at different sites to be connected to the VCS with complete control over communications, and by providing appropriate usage functions to operators. HF Multisite operation cannot use the VHF offset facilities. For this reason, and due to the HF audio signal characteristic, HF Best Signal Selection (BSS) requires advanced audio analysis algorithm to operate.

The wide experience acquired by SITTI in the Air Traffic Control field is once again put at the Customer disposal by exploiting SITTI integrated solutions to fulfil the needs of HF coverage over the ocean, thus contributing to the safety of all flights to and from Southern America.


The Brazilian Air Force is aiming at allowing the transmission of files and data over their existing HF radio network, not just limited to voice. This project, where SITTI is playing a key role, integrates itself with another project that is targeting the enhancement of the HF coverage of the oceanic region under Brazilian responsibility.

SITTI is providing gateway functions between external systems generating or requesting data files and the HF radios. This allows external third-party applications to access the military HF network and to send/receive data over it. SITTI is in charge of interfacing such applications and provide them with proper access to the network, according to customer requirements, over the INTRAER or ATN-BR networks.

Local and remote operators will be permitted to select the set of radios that best suit their mission and to dynamically associate such radios to external applications for data transmission/reception to/from aircrafts. This contributes to the optimisation of the usage of the entire system and network and improves their overall performance. Voice communications are of course always possible.

This project integrates the standard Radio Automatic Link Establishment features (ALE2G) to the data transmission, both in reception and transmission mode. When an incoming call is recognized the call is automatically answered and the best communication channel is automatically tuned to grant the best data transmission rate.

This project underlines the flexibility of SITTI systems. These in fact can provide features beyond just switching voice communication patterns, but also allowing the seamless integration of the management of new features, without compromising any of the other functions available to controllers.

Brussels, Belgium – January 30, 2017: Military pilots fly Spartan army carrier airplane during a flight to Brussels.