Operating instructions
DVB3030/DVB3030L Digital Video Broadcast Modulator User Interfaces
TM052 - Rev. 3.5 4-7
4.2.2 Modulator Menu Options and Parameters
There are 12 Modulator Screens available (Refer to Figure 4-5). These include:
1. Frequency: IF Carrier Frequency
Enter in 100 Hz increments from 50 - 90 or 100 - 180
MHz. L-Band (950-1525 MHz) is optional.
2. Power: Transmit Output Power
Enter in 0.1 dBm increments from -20.0 to 5.0 dBm.
3. Carrier: {On, Off}
Transmitter Power On/Off Control.
4. Spectrum Inv: {Normal, Inverted}
Modulated output spectrum inversion.
5. Modulation: {QPSK, BPSK}
Modulation Type.
6. Symbol Rate: Output Symbol Rate
Enter in 1 SPS increments from 1,000,000 to
45,000,000 SPS.
7. Data Rate: Terrestrial Data Rate
Enter in 1 BPS increments from 1,000,000 to
78,750,000 BPS.
8. Clock Invert: {Normal, Inverted}
Inverts the terrestrial data clock.
9. Data Invert: {Normal, Inverted}
Inverts the terrestrial data stream.
10. Conv Enc: {None, VIT1/2, VIT2/3, VIT3/4, VIT5/6, VIT6/7, VIT7/8}
Sets the convolutional encoder rate.
Note: Changing FEC rate will leave Symbol rate constant while changing data rate for
new overhead. If previous data rate is desired, it must be reentered after FEC rate change.
11. Roll Off: {0.35, 0.20}
Changes the Spectrum Roll Off.
12. Last Rate Control: {SYMBOL, DATA, AUTO}
Selects rate precedence, See Last Rate Control Notes.