<< Click to Display Table of Contents >> Navigation: Controls and Menu System > Menu System > Modulator Menu Explained |
Menu Title |
Default |
Description |
---|---|---|
Country |
U.K |
Country will be determined by TV country of operation |
Channel |
CH60 |
Channel number |
Freq (Khz) |
786000 |
Channel Frequency will correspond to channel number |
BW (MHz) - Bandwidth |
8 |
Bandwidth of the sub carrier |
Constellation |
64QAM |
Quadrature Amplitude Modulation Type of modulation for digital signals (DVB-C and -T). Two signal components I and Q are each quantized and modulated onto two orthogonal carriers as appropriate for the QAM level (4, 16, 32, 64, 128, 256). The constellation diagram is obtained by plotting the signal components with I and Q as the coordinate axes. Therefore, 2, 4, 5, 6, 7 or 8 bits of a data stream are transmitted with one symbol, depending on the QAM level (4, 16, 32, 64, 128, 256). This type of modulation is used in cable systems and for coding the COFDM single carriers. |
FEC - Forward Error Correction |
7/8 |
Code rate:1/2, 2/3, 3/4, 5/6, 7/8 Used to trade bit rate versus ruggedness, e.g. the signal strength required and interferenceprotection required |
FFT - Fast Fourier Transform |
8K |
The DVB-T standard defines two FFT modes to constitute the OFDM signal: 2K – 2048 subcarriers 8k – 8192 subcarriers |
Guard in - Guard Interval |
1/32 |
The guard interval is a proportion of the time there is no data transmitted between the symbols |
RF out - Power Output |
-31 dBm |
The output power should be balanced to obtain a good signal at the receiving unit |