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Modulator

PLL SAW Filter Modulator

Adjacent Channel Modulator

16 Channel Combiner

INET DSM2000-1A Smart Adjacent Channel Modulator

Features of INET DSM2000-1A Smart Adjacent Channel Modulator

Applicable for 47~870MHz system, fix chancel outputting, specially designed for middle or large scale system
LCD display: Radio Frequency, Video/Audio medium frequency, Video frequency modulating scale, Audio frequency modulating deviation, RF output level, A/V ratio, etc
I 2 C Bus control
Audio noise reduction (optional)
Clamping and non-clamping switch, easy for Video frequency interference
Medium frequency modulating, Video/Audio medium frequency signal input, output port can be applied for interference loading for fee-paid TV system
In accordance to adjacent frequency design, no interference between adjacent chancel
Having RF automatic amplitude-stabilizing circuit, making front-end system becoming more stable and reliable
RF output adopting modular amplification, ensuring RF output dynamic and parasite suppressing
Adopting unique diode dual-balance modulating, good linearity, low noise, modulator’s indexes, such as S/N, C/N, DG, DP, have achieved internationally advanced level
Surface mount technology, ensuring the accordance of entire machine
19”1U standard structure, independent power supply, elegant outlook, flexible corollary equipment

Specifications INET DSM2000-1A Smart Adjacent Channel Modulator

RF	Frequency Range	47 ～ 870MHz Specified Channel
	TV system	PAL D/K
	Intermediate Frequency	38MHz
	Output Return loss	≥ 15dB （ VHF ）
	Output Return loss	≥ 12dB （ UHF ）
	Output level	≥ 120dB µ V(Typical)
	Audio carrier power to video carrier power ratio	– 10 ～ – 20 dB （ 0.5dB Step ）
	Total Frequency deviation	≤ 5KHz
	Error of video/audio carrier interval	≤± 0.5KHz
	Carrier to noise ratio (C/N)	≥ 65dB （ fc ± 4MHz ） ≥ 70dB （ fc ± 8MHz ） ≥ 80dB （ fc ± 16MHz ）
	Output suppression	≥ 68dB
	Interface	FL10
Vdeo	Degree of modulation signal	≥ 87.5%
	Flatness in operating band	≤± 0.75dB
	Phase of differential coefficient	≤ 2%
	Gain of differential coefficient	≤ 2 °
	K-2T Factor	≤ 3%
	Delay difference of color or light	≤ 30ns
	Signal to noise ratio	≥ 58dB (unweighted)
	Signal to noise ratio	≥ 64dB (weighted)
Audio	Pre-emphasis of audio	50 µ s
	Maximum partial frequency of audio	± 50KHz
	Audio flatness	≤± 0.5dB （ 40Hz ～ 15KHz ）
	Distortion degree of audio	≤ 1%
	signal to noise ratio	≥ 65dB
Communication Interface	Interface	DB9
	Communication Format	RS232
	Data Rate	9600bits/s
Miscellaneous	Dimension	44mm × 482mm × 360mm
Miscellaneous	Power	220V AC ± 10% 50Hz 25VA

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