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Home > Products > Analog TV Device

 

DSM860-1A adjacent channel modulator

R: V20150828-21-30   

 

Outline

DSM860-1A adjacent channel modulator is an enhanced TV modulator with the function of modulating audio and video signals into RF signal to output. As DSM2500A adjacent channel modulator, the DSM860-1A modulator is also an advanced fixed channel output modulator applied for 47-870 MHz large scale CATV system. Simultaneously, it has good performance in C/N, A/V, output level etc. Different from DSM2500A modulator, it has simple and different internal configuration so that it can leave out the modules and other components. Thereby, it can largely save the manufactures’ and operators’ cost.

Features

  • Applicable for 47-870MHZ large-scale system
  • Fixed channel output
  • LCD display: including RF frequency, A/V medium frequency, video modulating depth, audio frequency modulating deviation, RF output level
  • IF modulation: IF audio and IF video signals input
  • Applicable for scrambling pay-per-use CATV system
  • Designed according to the transmission requirement of adjacent frequency, no interferences between adjacent channels
  • With RF automatic amplitude-stabilizing circuit so that the head-end system can be more stable and reliable
  • Good in linearity and low in noise by adopting unique diode dual-balance modulation circuit
  • All indexes have reached to international advanced level, such as S/N, C/N, DG, DP
  • Manual technology to ensure the consistency of the entire machine
  • 19' 1U standard  structure, independent power supply, elegant appearance

Specifications

RF

Frequency range 

47~870MHz fixed channel

TV format

PAL D/K or PAL B/G

Intermediate frequency (IF)

38Mhz/31.5Mhz or 38.9Mhz/33.4 Mhz

Output Return  loss

≥15dB(VHF)  ≥12Db(UHF)

Output level

≥115dBuV(typical)

Output level adjustable range

0~16dB

Audio to video ratio (A/V )

-8~-22dB

Frequency exactness

≤±5KHz

Total Frequency deviation

≤10KHz

Error of video/audio carrier interval

≤±0.5KHz

Carrier to noise ratio (C/N)

≥63dB (fc±4 MHz)

≥70dB (fc±8 MHz)

≥80dB (fc±16MHz)

Output suppression

≥65dB

Connector

FL10

Video

Modulation depth

≥87.5%

Input impedance

75Ω

Input amplitude

1.0Vp-p

Video flatness

≤±0.75dB

Gain of differential coefficient

≤2%

Phase of differential coefficient

≤2°

K Factor

≤2%

Time delay difference of color/ light

≤30ns

Signal to noise ratio

≥56dB(unweighted)

≥62dB(weighted)

Audio

Audio Pre-emphasis

50us

Input impedance

≥10KΩ( unbalanced)

Maximum frequency derivation

±50KHz

Audio flatness

≤±0.5dB(40Hz~15KHz)

Audio distortion degree

≤1%

Signal to noise ratio

≥65dB

Miscellaneous

Dimension

44mm×482mm×330m

Power

AC220V±10%50Hz12VA

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