Part #: 990-3138-000

Model: M1090




CVR Adapter/Mixer

Part Number :

  • CVR Adapter that operates a differential summing amplifier for combining microphone, communications, intercom and paging audio into one isolated output to the CVR
  • Features three biased MIC inputs, three Bias Disable inputs, three AUX inputs, and transformer coupled output to the CVR
  • Transformer coupled output stage can handle wiring runs to CVR as long as 200 feet


Nominal SuPply Voltage: +28VDC Operating Range: 18V to 32V
Current Draw: 150mA dc max; 1 Amp or less suggested (circuit breaker) MIC Input Impendence: 450 Ohms from 150Hz to 6 kHz (bias enabled); >or=5K Ohm from 150Hz to 6kHz (bias disabled)
MIC Input Level: 150mV rms for 500mV rms out MIC Input Bias: +16Vdc behind 940 Ohms,
AUX Input Impedance: >or=100k Ohm from 150Hz to 6kHz AUX Input Level: 2.0V rms for 500 mV rms out
Bias Disable Control: Diode isolated, internally pulled up to 16V dc thru 10k Ohms. Pull below +8V dc to turn bias off, float above +12V dc to turn bias on Output Impedance:
Rated Output: 500mV rms from 150Hz to 6kHz Output Load Impedance: 5k ohms (suggested)
Frequency Response: +3,-3 dB from 200Hz to 6kHz Referenced to 1kHz at 500mV rms output into 5k Ohms load Distortion:
Output Noise: >60dB below 500mV rms output MIC Inputs Max Gain: AV=3.33 (10.5dB)
AUX Inputs Max Gain: AV=.25 (-12.0dB) Case Style: Rectangular with flat plate for hard mounting
Case Size: 3.5"W x 1.54"H x 2.5"D Weight: .3 lbs


Part Number: Description:
990-3138-000 CVR Adapter/Mixer


Serial # 9006206
Condition SVC
Mods None
Tag Date 10/04/23
Shop Southeast Aerospace Inc.
Warranty 6 Months
Serial # 9006285
Condition SV
Mods None
Tag Date 10/04/23
Shop Southeast Aerospace Inc.
Warranty 6 Months
- CVR Adapter/Mixer
Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.