Transcript
RF
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CBS-A-ACM CONNECTION TO THE MODERN WORLD
I OVERVIEW HEAD-END PROFESSIONAL ANCIENT CHANNEL MODULATOR CBS-A-ACM Modulator is the main equipment CATV for analogue head-end on the output of the system. Equipment is receiving Audio an Video signals which come from different sources like: DVD player, output from STB, video server, live Camera output etc. It does signal processing like analogue modulation, based on the settings adjusted on front panel, and on output provide Agile frequency SSB RF output. Its dimension is 1U standard case. By using the LCD display on the front panel, user can adjust the setting of this equipment. Affordable for Large ans small CATV head-end analogue systems.
Video baseband Modulation
Control template
LCD
Keyboard
Audio baseband
RF TEST -30 db
RF Output
II MAIN FEATURES Applicable for 47~860MHz system, agile channel output, specially designed for middle or large system n I2 C Bus control n ? LCD Display n ? Audio noise reduction (optional) n ? Medium frequency modulating, Video/Audio medium frequency signal input, n ? output port can be applied for scramble loading for fee-paid TV system In accordance to adjacent frequency design, no interference between adjacent channel n ? Having RF automatic amplitude-stabilizing circuit, n ? making front-end system becoming more stable and reliable RF output adopting modular amplification, ensuring RF output dynamic and parasite suppressing n ? Adopting unique diode dual-balance modulating, good linearity, low noise, modulator's indexes, n ? such as S/N, C/N, DG, DP, have achieved internationally advanced level Surface mount technology, ensuring the accordance of entire machine n ? Providing RF output monitoring port（-30dB）； n 19”1U standard structure, independent power supply, elegant exterior design n ? LCD display, flexible in operating n High reliability design, stable in running n http://cbs.com.mk
086|087
http://cbs.com.mk
RF
CBS-A-ACM CONNECTION TO THE MODERN WORLD
III SPECIFICATION Frequency range
47~862 MHZ Specified channel
TV system
PAL B/G, PAL D/K or NTSC
Intermediate frequency
38 MHz
Output return loss Total deviation Output level RF
Output level adj. range
≥ 14 dB (VHF), ≥ 12 dB (UHF) ≤ 5 KHz ≥ 115 dBµ V (Typical) 0~15 dB - step 0.5 > 60 dB (fc ± 4 MHz)
Carrier to noise ratio (C/N)
> 65 dB (fc ± 4 MHz) > 75 dB (fc ± 4 MHz)
Output suppression Ω Output interface Degree of modulation signal Flatness in operating band
Video
Phase of differential coef.
> 62 dB FL 10 > 87.5 % ≤ 1.5 dB (8 MHz)
Gain of differential coefficient
≤ 3% ≤ 5o
K-2T factor:
≤ 3%
Signal to Noise ratio:
> 54 dB (unweighed) > 60 dB (weighed)
Pre - emphasis of audio:
Audio
Audio response: Distorzion degree of Audio: Signal to Noise ratio:
Miscellaneous
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Dimension Power
50 µ s ≤ ± 0.5 dB ( 40 Hz ~ 15 KHz) ≤ 1% > 60 dB 44 mm × 482 mm × 360 mm 220 VAC ±10% 50Hz 10VA 086|087
