- Head-end modules are made as fix channel modules under customer’s demand such as programmable modules
- High selectivity of channel amplifiers and converters
- High linearity and noise-immunity of head-end inputs
- 30dB-depth automatic gain control (AGC)
- High reliability of the head-end is provided by modern electronic components
- High selective converters allow to adjacent channel working while input level differences between any one and the nearest adjacent channels at least 40 dB
- 2/3/4/8-input combiners are used to divide and sum input signals
- Combiners allow the manual tuning of the signal level
- Built-in output combiner –30 dB test port
- Head-end is designed for round-the-clock working
- “F”-type input/output connectors
- SG24 modulators match with the conditional access system for terrestrial analogue broadcasting of “Cripton” company
Need a consult?
Our experts will answer any technical questionDue to the wide spectrum of amplifiers, converters, modulators, head-end SG24 is practically applicable under any customer’s demands. Module construction allows to increase the number of channels easily. Below, some versions of SG24 for different demands are shown.
Channels modules are set on the main frame (up to 8 channels) together with power supplies and combiners. If the number of channels is more than 8, can be used two or more main frames. Main frames are made as for the wall fastening such as for the rack mounting (19”).
Fig.1 Structure schematic of 8-channel head-end SG24
PLANAR company produces converters as with a single such as a double frequency transformation. Converters with a single transformation are recommended to use in small number of channel systems. They provide high quality reception of TV signals while the level difference between two non-adjacent channels is 28 dB or less. Single transformation converters do not allow to realize all input to output channel combinations.
Double transformation converters have the highest selectivity to provide the adjacent channel working. They allow to perform the high quality reception of TV signals while the level difference between two non-adjacent channels is up to 40 dB. Besides, they allow to realize any input to output combinations including adjacent channels.
While using a programmable converter, it is necessary to know that TV tuner is used on the converter input. The selectivity of input TV tuner is worse that the selectivity of the channel filter used in a fixed channel converter. So we do not recommend to use programmable converters while the large signal level difference in adjacent channels.
RF signal to non-weighted noise ratio inside of 5.75 MHz band, dB, or better | 60 |
Output level per each channel (depends on configuration), dB, µV | 98-118 |
AGC, dB, or better | 30 |
Selectivity on the nearest non-adjacent channel inside of TV range, dB, or better | 70/50/40 |
Mirror channel selectivity (for converters), dB, or better | 65 |
Spurious frequency output level, dBc, or less | -65 |
Level deviation, dB, or less | 1,5 |
Image carrier deviation at unstability ±2x10-5 for operating temperature, kHz, or less | 20 |
Operating voltage, V | 220 (+10 -15%) 50Hz |
Environment condition: | |
temperature, °C | 0+50 |
relative humidity at 25 °C, % | <80 |
atmospheric pressure, kPa | 86-106 |
Dimensions, mm | |
4-channel version | 284x250x155 |
6-channel version | 372x250x155 |
8-channel version | 460x250x155 |
Weight, kg: | |
4-channel version | 3 |
6-channel version | 3.6 |
8-channel version | 3.9 |