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Ethernet data transmission digital radiorelay station with data rate 1.5Mbps
in frequency range 500-580MHz/620-700MHz Contact 07DM.2ETH, Contact 07DM1.2ETH

in frequency range 1300-1360MHz/1440-1500MHz Contact 15DM.2ETH

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                      * RRS Contact 07DM1.2ETH compared with RRS Contact 07DM.2ETH has better selectivity

                      * Technical Description and Manual Contact-07DM-2ETH 466 kb, 29/09/09

Product specifications
Contact 07DM.2 Contact 07DM1.2ETH Contact 15DM.2
Transmitter power 10 W 4 W
Receiver sensitivity at BER 10-8 -112 dB/W -120 dB/W
Transmitter tuning range 500-580 MHz - I range
620-700 MHz - II range
1300-1360 MHz - I range
1440-1550 MHz - II range
Receiver tuning range 500-580 MHz - I range
620-700 MHz - II range
1300-1360 MHz - I range
1440-1550 MHz - II range
Transmitter / receiver frequency spacing I range / II range
II range / I range
I range / II range
II range / I range
Adjustment step 0.1 MHz 1 MHz
Emission frequency band on level -30dB 2 MHz 2 MHz
Modulation type QPSK QPSK
Gain of transceiving antennas 12 dB 12 dB
Transmission range in line-of-sight (information speed 1,5Mbps) 40 km 40 km
Error protection BCH code (31,16) BCH code (31,16)
Voice connection Yes Yes
Service connection (RS 232) Yes Yes

Below are the technical characteristics RRS Contact 07DM1.2ETH

Receiving path sensitivity of RRS Contact 07DM1.2ETH

In the tuner input is fed attenuated modulated signal, in which the error rate (up correct them) does not exceed the value of 10-3, then turn off the modulation and carrier level is measured at the tuner input. The measurement results are recorded in Table 1

Receiving path sensitivity
Carrier frequency, MHz Carrier level (modulation cut off), dB/μV
500 24
540 23
576 24
624 23
660 22
700 23

Receiving path selecitivity of RRS Contact 07DM1.2ETH.

In tuner input is supplied modulated signal with level of 27 dB / μV and noise signal, rebuilt from the center of the band IF filter for a given value. Noise level at which the error rate (up correct them) does not exceed a value of 10 -3 are fixed. The measurement results are recorded in table 2.

Receiving path selecitivity
Center frequency of desired signal, MHz Desired signal level, dB/μV Noise frequency, MHz Tuning-out from central frequency of desired signal, MHz Noise level, dB/μV Dynamic range, dB (difference between noise and signal)
650 27 645 -5 92 65
650 27 646 -4 92 65
650 27 646,5 -3,5 92 65
650 27 647 -3 92 65
650 27 647,5 -2,5 91 64
650 27 648 -2 90 63
650 27 648,5 -1,5 81 54
650 27 649 -1 24 -3
650 27 650 0 18 -9
650 27 651 1 26 -1
650 27 651,5 1,55 81 54
650 27 652 2 90 63
650 27 652,5 5,2 91 64
650 27 653 3 92 65
650 27 653,5 3,5 93 66
650 27 654 4 94 67
650 27 661 10 94 67

Parameters of the dynamic range with other desired signal center frequencies are preserved.

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