Digital Radiorelay Station (DRRS) “Oksamit”

PURPOSE:

Digital Radiorelay Station (DRRS) is intended for the organization of connection up to eight intervals on distance of 450 km.

Connection is carried out in a batch mode in local net­ work Ethernet 10 Base T with the organization of voice com­ munication and signalling of telecontrol, the telesignal system and remote control.

THE STATION PROVIDES THE FOLLOWING OPERATING MODES:

-  mode of retransmission;

-  mode of radio silence;

-  mode of standby;

-  mode of data transmission in a batch mode in local network Ethernet 10 Base T;

-  control mode by station from a control panel or from a computer on joint RS 232;

-  mode of the automatic control at which the control of serviceability of the equipment is provided;

-  mode of automatic installation of operating frequencies of station at which the opportunity of adjustment for the allocated fixed frequencies of reception and transfer is provided, in view of a protective interval - 43 MHz.

TECNICAL CHARACTERISTICS:

frequency range, MHz                                375-750;

frequency quantity                                     80,0;

frequency step of a grid                             1,0;

transmission rate in channel Ethernet up to 1600 kbps in both directions.

TYPE OF THE AERIAL AND ITS CHARACTERISTIC:

-   lagoperiodic antenna two-element lattice;

-   amplification rate of the aerial not less than 10 db;

-   voltage standing-wave ratio of aerials in a operating band no more than 1,8. RANGE OF COMMUNICATION:

-   on open lines at direct visibility between the aerials, the sure connection can be provided on distance up to 60 km;

-   the probability of a mistake makes no more than 10-6 for 99,4 % of an operating time.

CAPACITY OF THE TRANSMITTER:

-   value of target capacity of the transmitter not less than 10 watt;

-   a deviation of capacity of the transmitter from rating value at influence of destabilizing factors no more ±1,5 db;

-   capacity of the transmitter of station is operatively adjusted within the limits of 30 db with step 1 db, relative to a nominal level;

-   out and collateral radiations of the transmitter of station make not less then -60 db;

-   VSWR of antennas in frequency band no more 1,8.

THE STRIP OF RADIATION OF THE TRANSMITTER OF STATION SHOULD NOT EXCEED:

-   on a level a minus 3 dB - 1,4 MHz;

-   on a level a minus 30 dB - 2,52 MHz.

SENSITIVITY OF THE RECEIVER:

-   sensitivity of the receiver of station at a level of mistakes rate (BER) 1[1]10^-3 there should be not less a minus 121 db/Watt;

-   a dynamic range of the receiver of station not less than 60 db;

-   selectivity of the receiver on the next channel, at adjustment ±42 MHz not less than 70 db;

-   selectivity on the mirror channel of reception not less than 80 db.

STABILITY OF FREQUENCY:

-   relative stability of operating frequency of the transmitter (receiver) of station not less 2*10^-6, with temperature range -20.... +50 C.

POWER SUPPLIES OF STATION:

-  power supplies of station are provided with a source of a direct current a voltage (+27±5) V.

-  power consumed by station, do not exceed 130 watt.

THE MONITORING SYSTEM:

-   the monitoring system of station provides the control, management and indication of a condition of connection, and also a condition of blocks and indication of malfunction of blocks using the data of internal sensor and your PC through RS232 junction.

WEIGHT AND DIMENSIONS:

-    the weight of station 50 kg, overall dimensions 480x350x340 mm (widthxheightxdepth).

STATION INCLUDES: