Videotek DM-200A Frequency Agile Demodulator

Videotek DM-200A Frequency Agile Demodulator
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Videotek DM-200A Frequency Agile Demodulator Videotek DM-200A Frequency Agile Demodulator
Videotek DM-200A
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Datasheet

Representing over a quarter century of continuous commitment to meeting the requirements of the most demanding video RF engineers, Videotek offers the DM-200A high-performance demodulator. With a signal-to-noise figure better than 58 dB, the DM-200 series is ready to take charge at your laboratory bench, cable head end rack or broadcast facility. For use when you are performing FCC compliance testing, monitoring or recording offair signals, or rebroadcasting to your cable plant.
 

Features:

  • Full FCC 4.1 MHz bandwidth video for compliance testing
  • Better than 58 dB Video SNR
  • Differential gain: ≤1.0%
  • Differential phase: ≤1.0°
  • Multi-band tuning: VHF/UHF/Cable with HRC/IRC offset capability
  • Proprietary high-performance SAW filter ensures optimal performance
  • Simultaneous BTSC stereo and SAP outputs with LED presence indicators
  • 4.5 MHz and composite audio outputs
  • IF (45.75 MHz) loop enables use of external decoders
  • Zero Carrier Pulse control allows depth of modulation measurements
  • Synchronous detection
  • Remote control via user-selectable RS-232/422/485 port
  • Standards available: NTSC and PAL-M

 

Specifications:

Tuner
Tuning Range 55.25 MHz to 860.00 MHz
Connector "F", 75Ω female
Input Range -10 to +25 dBmV
Maximum RF Input Level +30 dBmV
Fine Tuning Range ±2 MHz in 64 steps
Frequency Stability ±60 kHz typical
Channel Coverage VHF Channels 2-13
UHF Channels 14-69
Cable Channels 1-134
Band Coverage Low, Mid, High, Super
Detector Synchronous
IF Loop +38 dBmV ±2 dBmV
Video
Video Output Two NTSC video outputs with negative sync and DC restoration
Connectors BNC 75Ω, source terminated
Level 1V p-p, typical into 75Ω load
Adjustment Range ±3 dB, minimum (front-panel control)
Differential Gain ≤1.0%
Differential Phase ≤1.0°
Frequency Response Up to 3.58 MHz ±0.6 dB (trap in)
Up to 4.1 MHz ±0.6 dB (trap out)
Chroma/Luma Delay ±30 ns (referenced -170 ns) (w/perfect modulator) (trap in)
Signal To Noise Ratio ≥58 dB @ +14 dBmV input level
Zero Carrier Output User selection ON/OFF; Location of Zero Carrier Pulse front panel selectable from line 10 through line 25
Connector BNC 75Ω, female
Audio
Audio Line Outputs Balanced stereo left and right and SAP (source terminated)
Connectors Push-on pin connectors
Level 0 dBm ±1 dB typical across 600Ω
Adjustment Range -16 dBm to +4 dBm
Frequency Response 50 Hz to 12 kHz (stereo mode) ±0.5 dB
Stereo Separation >30 dB from 50 Hz to 10 kHz
Total Harmonic Distortion (THD) 0.5% maximum, 1 kHz to 12 kHz
Signal To Noise Ratio ≥60 dB
Monitor Audio jack; front panel level control
Audio Jack Impedance >16Ω level -25dBm Nominal, Adj.
Range ±15 dB
4.5 MHZ Output +42 dBmV limited ±2 dB
Composite Audio Output 0.5V p-p terminated 75Ω;
bandwidth 110 kHz ±1dB