The ROSTEC LDIS8 is a general purpose DC - 30 MHz linear distribution amplifier intended for use in the studio and broadcast environment. The amplifier architecture is bipolar throughout, which means it can handle signals with both positive and negative voltage swing.
It is especially well suited to distribute such signals as PAL/NTSC video, T1/E1 G704/703 signals, SPDIF digital audio or various impulse and DC control signals. Eight outputs are available when receiving signals via the GPU bus. One input and seven outputs are available when the external input is used.
The input circuit is unterminated and electronically balanced but can be configured to unbalanced configuration by means of a jumper. The gain can be set to 1x for unterminated signals and 2x for terminated signals (termination halves the amplitude). The input circuit also features an adjustable shelving equalizer enabling it to compensate for high frequency loss in cables. A low cut filter at 3 Hz for AC operation is also available.
The signal from the input circuit is fed to eight identical buffers. Each buffer has an adjustable gain of +/- 6 dB. The output impedance is 75 ohms and the maximum voltage swing is 14 volts PP with no load, 7 Volts PP into 75 ohms.
The input signal is also fed to the GPU bus buffer to be routed to the other cards in the frame, thus allowing for 4 cards in the GPU frame to distribute the same signal, i.e. one input and 31 outputs.
Although the LDIS8 is not intended for high quality audio, it actually handles analog audio signals up to +12 dB pretty well, with reasonable low noise and low distortion. The noise in the audio band is 104 dB(A), the distortion is 0.01 %.
