DVT913 TV CHANNEL CONVERTER

Transcription

1 Broadband Cable Networks 1(5) DVT913 TV CHANNEL CONVERTER General DVT913 is a TV Channel Converter for the DVX tend product family. It consists of an input down converter from to, a high selectivity part and an output upconverter from to. The converter has also an interface for versatile backup functions. The DVT913 has an input frequency range of MHz and the output can be set anywhere between MHz. The DVT913 is capable of adjacent output channel use. All parameters of the converter are fully programmable using the CATVisor Commander software. It is fully compatible with the DVX tend Headend System and can be installed into a standard DVX001 installation frame. Features High input selectivity and signal handling capability All input channels available MHz High selectivity Manual gain control also possible Automatic switching and backup functions possible High accuracy output level, capable of adjacent output channel use (VSB) Monitoring functions Input signal level Pre-amplifier current output level Self diagnostic Remotely controlled parameters Input frequency Pre-amplifier voltage and load (ON/OFF, Voltage 12/24 V) Gain control (automatic/manual) Output frequency and level

2 Broadband Cable Networks 2(5) Technical specifications All specification are typical values unless other mentioned. Parameter Specification Note input MHz 250 khz steps Level dbµv note 1 75 Ohm Return loss 18 db Noise Figure 16 db at maximum gain Image attenuation 60 db Max. level of unwanted channels see figure 1 Input C/N 57 db see figure 2 Input MHz Level dbµv 75 ohm Return loss 18 db note 2 Output MHz Level 95 dbµv note 3 75 ohm Return loss 18 db note 2 Transfer Bandwidth 7 MHz Pass band frequency response ± 0.5 db Adjacent channel selectivity 65 db Intermodulation distortion 66 db note 4 Group delay ripple ± 50 ns note 5 Output MHz Level dbµv Level inaccuracy ± 1 db Worst case value Level stability ± 0.3 db Intermodulation distortion dbµv input level 75 Ohm nominal Return loss >18 db at 47 MHz, -1,5 db/oct Spurious attenuation 65 db min. 60 db Group delay ripple ± 50 ns C/N note 6 Inchannel 66 db f noise > ( f vision MHz) 76 db f noise > ( f vision MHz) 83 db

3 Broadband Cable Networks 3(5) General Pre-amplifier current feed 100 ma note 7 Supply voltages +12.5V / 100 ma +6.3 V / 920 ma Connectors, input input output output F Control 15-pin HD sub Dimensions 6U*7HP*170 mm h*w*d Weight 1 kg Operating temperature range C Specifications met C Storage temperature range C EMC compatibility EN Notes 1) Worst case input sensitivity is 75 dbµv between MHz 2) Typical value, worst case value 15 db 3) Vision carrier level, inaccuracy ± 1 db 4) Worst case value measured at maximum input level 5) Worst case value, measurement aperture 30 khz 6) 105 dbµv output level, 4.75 MHz BW 7) Current limiter. Taken from either 12.5V or 24V power supply line Block Diagram Input Part Switching Output Output Input

4 Broadband Cable Networks 4(5) Figures +10dB 0dB -10dB N-4 N-3 N-2 N-1 N N+1 N+2 N+3 N+4 Figure 1. Maximum level of unwanted signals [dbuv] Figure 2. Typical value of C/N vs. input level

5 Broadband Cable Networks 5(5) 0 db MHz MHz Figure 3. Typical DVT91X selectivity a db -0,25 4, ,5-0,5 5,5 6,5 f f VISION MHz -1,15 Figure 4. Amplitude/frequency response