COVERAGE ENHANCER (download pdf)

The line of coverage enhancers developed by AD TELECOM is based on the technology SDR (Software Defined Radio), enabling the high-performance characteristics of all the models of the product range. The digital coverage enhancers main features are:

- Silencing when no communication: time slot ALC (Automatic Level Control)

- Channel filtering

- Distributed networking of coverage enhancers

- Up to 12 channels processing capacity.

- Remote monitoring via Ethernet (by means of web-server or external GSM modem)

- Easy installations

- Low-cost product

RIT-ECHO Line: Isofrequency TETRA Repeater with Echo Cancellation (download pdf)

The system RIT-ECHO stands out from other repeaters for the echo cancellation provoked by the coupling between the transmitting and the receiving antenna. The signals provided by the Base Station or a user are received, amplified and transmitted again, the antennas being located in the same tower. The coupling is cancelled by means of digital signal processing (DSP) algorithms that permit to work in stable conditions with a gain 20dB higher than the isolation between antennas. That represents an essential improvement regarding other repeaters that do not include cancellation (which require a gain 10dB below the isolation between antennas to avoid oscillation problems).

COMPACT-RIT Line: Smart Compact Repeater (download pdf)

COMPACT-RIT is specially designed to provide coverage in small areas, both interior areas (buildings, tunnels, commercial areas, basements, etc.) and open air areas (for instance streets or squares with the coverage limited by the surrounding buildings). Large areas are covered by using distributed networking of coverage enhancers, which does not deafen the base station due to mono-channel filtering and the slot silencing (when the channel is not being used). COMPACT-RIT offers the features of higher range products, but with an output power of 18 dBm.

OPTICAL-RIT Line (download pdf)

In the line of products OPTICAL-RIT there is no impact of the optical transmission loss: The digital optical transceiver permits an stable operation independently of the reception levels. Optical loss of up to 25dB are tolerated. The bi-directional link is design with a single fibre, using different wavelengths for down-link and up-link (1310nm and 1550nm respectively). The communication is established by a single mono-mode fibre using Wavelength Division Multiplexing.