Headends
Channel Converters
Channel Converter CT-311 (TV/DVB-T/DVB-C - for Terra MMH-3000 headend)
Code: R81715
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296.46 EUR
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View of the converter
The included accessories
The CT-311 R81715 channel converter is one of the optional modules that can be mounted in Terra MMH-3000 headends (in the base unit UC-380 R81700). The converter is used to change the original analog TV / DVB-T or DVB-C RF channel in order to ensure optimum channel plan in the distribution network, or - in the case of older cabling not capable of operating within (whole) UHF band - to shift the original channel to a lower one.
The device is not a trans-modulator - it does not change any parameters of the original signal except for the RF channel.
Transmodulation of terrestrial TV signals is performed by other modules designed for use in the MMH-3000 headend: ttx-311 R81714 (COFDM-COFDM - regeneration of a digital TV multiplex and optionally conversion of its frequency and filtering some programs) and rt-316 R81707 (OFDM receiver / PAL modulator).
The CT-311 R81715 channel converter can power an antenna preamplifier (12 VDC / 100 mA max).
The module, similarly to all components of TERRA headend, can be configured using free Terra Link or paid CMH Master R81706 software.
Features:
- conversion of the received RF channel (carrying analog PAL channel, DVB-T mux, or DVB-C mux) into another one,
- double conversion technology,
- high selectivity (two switchable IF SAW filters),
- input stage with AGC,
- input signal level and C/N measurement,
- RF loop,
- low level of harmonics and intermodulation products in the output signal.
More on MMH-3000 headend you can read in the article :
.Specifications
| Name | CT-311 | |||
| Code | R81715 | |||
| RF input | ||||
| TV standard | analog | DVB-C | DVB-T | |
| Frequency range | 44-862 MHz | 170-230 MHz; 470-862 MHz | ||
| Channel plans | BG/DK/I/Australia/NZ | |||
| Channel width | 7/8 MHz | |||
| Level/Impedance | 60-90 dBμV / 75 Ω | 50-80 dBμV / 75 Ω | ||
| Offset | 7 MHz | +/-1 MHz, 250 kHz step | +/-1 MHz, 500 kHz step | +/-125 kHz |
| 8 MHz | +/-166 kHz | |||
| Shut down level | < 50 dBμV | < 40 dBμV | ||
| Return loss | > 10 dB | |||
| RF loop gain | 1.5 +/-1 dB | |||
| Power for a preamplifier | 12 VDC (+/-0.5V) / 0-100 mA | |||
| RF output | ||||
| Frequency range | 110-862 MHz | 174-230 MHz; 470-862 MHz | ||
| Level/Impedance | 100 +/-2 dBμV / 75 Ω | 90 +/-2 dBμV / 75Ω | ||
| Offset | 7 MHz | +/-1 MHz, 250 kHz step | +/-1 MHz, 500 kHz step | +/-125 kHz |
| 8 MHz | +/-166 kHz | |||
| Level adjustment range | 0...-20 dB | |||
| IMD3 level | < -60 dB | |||
| IMD2 level | < -60 dB | |||
| Frequency response | fp@4.8MHz (8 MHz channel) | +/-0.5 dB | - | |
| fp@4.3MHz (7 MHz channel) | ||||
| fo+/-3.9MHz (8 MHz channel) | - | 1.5 dB | ||
| fo+/-3.35MHz (7 MHz channel) | ||||
| MER | - | > 31 dB | ||
| S/N | > 55 dB | - | ||
| Attenuation at channel edges | 7 MHz channel | > 45 dB | ||
| 8 MHz channel | > 20 dB | |||
| Return loss | > 10 dB | |||
| Power & Environment | ||||
| Power | 5.5 VDC / 1 A max | |||
| Operating temperature range | 0ºC...+50ºC | |||
| Dimensions/Weight | 45x115x220.5 mm / 0.42 kg | |||
Electrostatic discharge caution
The module contains electrostatic sensitive components. To minimize electrostatic discharge, observe the following precautions:
- Do not remove module from its anti-static plastic bag until you are ready to install it into the base unit.
- Hold the module only by its front panel.
- Do not place the module on an unprotected surface. Immediately after you remove the module from the base unit, you must insert it into its anti-static plastic bag.
- When the module is not in use, keep it in its anti-static plastic bag.
- Do not ship or store the module or base unit in/near strong electrostatic, electromagnetic or radioactive fields.
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