Description

Twin Agile SD DVB-T TV modulator

Modulating two analogue video/audio signals into COFDM modulated DVB-T RF channel

● AV – DVB-T stand-alone modulator
● PSI generation: SDT, NIT, LCN
● Processing from 2 video and audio sources into single RF DVB channel
● OLED graphical display and joystick control of internal microprocessor
● Adjustable RF output level and audio input level
● Loop through RF combining
● Low level harmonics and intermodulation products
● Robust diecast housing
Connectors:
● video/audio input – RCA socket
● RF – type F
● screw terminal block for DC entry power distribution bus

TV standard: PAL (B, D, G, H, I, M, N, 60); SECAM, NTSC (M, 4.43)
Video input:
frequency range 20 Hz – 6 MHz
level/impedance 1 V ± 0.1 V/75 Ω
Audio input:
frequency range 20 Hz – 15 kHz
level/impedance 775 mV/10 kΩ
level adjustment + 6 ÷ -6 dB by 2 dB step
Processing Video:
encoding ISO/IEC13818-2 MPEG-2 MP@ML
resolution 720 x 576 (at 25 fps), 720 x 480 (at 30 fps)
frame rate 25 max. PAL, SECAM, 30 max. NTSC
compressed system bit rate 2…9 Mbps
Processing Audio:
encoding ISO /IEC11172-3 (MPEG1 audio) layer 2 compliant
sampling rate 44.1 kHz
compressed bit rate 256 Kbps
audio mode Stereo
Modulation:
MER ≥ 35 dB
modulation QPSK, QAM16, QAM64
channel bandwidth 7/8 MHz
guard interval 1/4, 1/8, 1/16, 1/32
code rate 1/2, 2/3, 3/4, 5/6, 7/8
transmission mode 2K
RF output:
frequency range 110 – 860 MHz
level/impedance 85 dBμV/75 Ω
output C/N ≥ 50 dB
output level adjustment range 0 ÷ -15.5 dB by 0.5 dB step
frequency range of RF combining 47-2150 MHz
DC pass through 0.3 A
combining through loss Terr/SAT 1.5/2.5 dB
return loss ≥ 10 dB
Current consumption: 12 V 0.65 A

TERRA