QDA4-45 Distribution Amp Combiner

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  • QDA4-45 Distribution Amp Combiner
  • QDA4-45 Distribution Amp Combiner
MSRP: $481.00
— You save $72.00


The Contemporary Research QDA4-45 is an amplified RF combiner that can switch between one or four inputs, with adjustable amplification up to 32 dB of gain.

Designed for QMOD HDTV applications, the QDA4-45 can receive an RF feed from QMOD modulators or QCA9-33 Active Combiners. Inputs can be switched between one or four inputs, with selectable gain.

The compact QDA4-45 mounts in a single rack space using either the Contemporary Research RK1 single rack mount kit or RK2EZ dual rack mount kit. The units are wholly designed and manufactured in the USA.


  • Switches between one input or four input combiner
  • Adds up to 32 dB gain for one input, 25 dB for 4 inputs
  • Front-panel gain adjustment and LCD level display
  • Provides a maximum output level of up to 50 dBmV
  • Wideband, low noise amplifier 
  • Low power, draws less than 8.5 watts
  • Compact metal enclosure, mounts in 1 RU using the RK1 or RK2EZ rack mount kits


  • Combine up to 4 QMOD Modulators
  • Combine 4 QCA9-33 Active Combiners for 36 channels
  • Use as launch amp for RF system
  • Use as booster amp to merge QMOD channels with existing 50 dBmV analog modulator systems

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