DSM2500B Adjacent Frequency Agile Modulator

- Applicable for 47~870MHz system, agile channel output,specially designed for large
scale system 
- Man machien dialogue function 
- Vedio frequency AGC function 
- RS485 net administration function 
- I2 C Bus control 
- LCD Display:Radio frequency,Video/Audio medium frequency,Video frequency modulating
scale,Audio frequency modulating deviation,RF output level,A/V ratio,etc. 
- Audio noise reduction (optional) 
- Clamping and non-clamping switch,easy for Video frequency scrambler 
- Intermediate frequency modulating,Video/Audio medium frequency sgnal input,output
port can be applid for interference loading for fee-paid TV system 
- In accordance to adjacent frequency design, no interference between adjacent channel

- 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 exterior design 

Specification: 
- RF: 
IF 38MHz/33.4MHz
output return loss ≥15 dB (VHF) ≥ 12 dB (UHF) 
output level ≥ 120 dBμV (typical value) 

C/N ≥ 65 dB (fc ± 4 MHz) 
      ≥ 70 dB (fc ± 8 MHz) 
      ≥ 80 dB (fc ± 16 MHz) 
spurious output suppression ≥ 68 dB 
- Video: 
input level 1.0 Vp-p 
video modulating rate 87.5 % 
deferential gain ≤ 2 % 
deferential degree ≤ 2 ' 
video in-band flatness ≤ ± 0.75 dB 
video S/N ≥ 58 dB (non coefficient added) 
               ≥ 64 dB (coefficient added) 
- Audio: 
audio deviation ± 50 KHz 
audio in-band flatness ≤ ± 0.5 dB(40Hz∼15KHz) 
audio distortion degree ≤ 1 % 
audio S/N ≥ 65 dB 

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Sichuan Desai Electronic Techenology Co., Ltd. [CN]

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