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Home > Products > Analog TV Device

 

DSM2500A adjacent channel fixed modulator

R: V20150828-21-27 Data sheet  

 

Feature

  • Applicable for 47~870MHz system, fixed channel output ,specially designed for large scale system
  • Video frequency AGC function
  • RS485 Ethernet Interface(Reserved)
  • LCD Display :RF frequency ,Video/Audio IF frequency ,Video frequency
  • Modulating scale ,Audio frequency modulating deviation ,RF output level ,A/V ratio ,etc
  • Audio noise reduction (optional)
  • I2 c Bus Control
  • Clamping and non-clamping switch optional,easy for Video frequency scrambler
  • IF frequency modulation ,Video/Audio medium frequency signal input ,output port can be applied for interference loading for fee-paid TV system
  • In accordance to adjacent frequency transmit required 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

Frequency range 

47~870MHz

TV system

PAL B/G

IF frequency

38.9 MHz

Output Return  loss

≥15dB(VHF)  ≥12dB(UHF)

Output level

≥120dBuV

Output level adjustable range

0~16dB(0.5dB step )

Audio ,video and power ratio

-8~-22dB(0.5dB step )

Image carrier frequency accuracy

≤2KHz

The total deviation of the image carrier frequency

VHF≤5KHz   UHF≤10KHz

Error of video/audio carrier interval

≤±0.5KHz

Carrier to noise ratio (C/N)

≥65dB(fc±4MHz)

≥70dB(fc±8MHz)

≥80dB(fc±16MHz)

Parasitic output suppress

≥68dB

Interface

FL10

Video

Video signal modulation

≥87.5%

Flatness in operating band

≤±0.75dB

Differential gain

≤2%

Differential phase

≤2°

K-2T coefficient

≤3%

Color/ light delay

≤30ns

Signal to noise ratio

≥58dB(unweighted)

≥64dB(weighted)

Audio

Pre-emphasis of audio

50us

Maximum audio frequency deviation

±50KHz

Audio flatness

≤±0.5dB(40Hz~15KHz)

Distortion degree of audio

≤1%

Audio signal to noise ratio

≥65dB

Communication interface

Interface

RJ45

Communication format

RS485

Date rate

9600bits/s

Miscellaneous

Dimension

44mm×482mm×360m

Power

AC220V±10%50Hz20VA

 

Test Report

   

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