The Model 247 is a multipurpose audio mixing amplifier for mixing aural warning, cockpit voice recorder, or any other aircraft audio signals. Each input is adjustable to accept 0.25 VRMS microphone input signals, headphone audio signals from standard audio systems, or receiver audio signal up to 50 mW. The outputs are designed to drive any impedance from 8 to 10K. Additional inputs can be added by connecting one of the outputs to feed an input of another mixer.
Features
This Model 247 (EDMO# NAT247) is designed for driving non-DC biased (ground referenced) loads.
- Contains 3 independent audio mixing circuits that have four input channels and one output channel each
- Adjustable inputs accept microphone signals, headphone audio signals, or receiver audio signals
- Weight: 0.6 kg (0.42 lb)
- Dimensions: 41.40 x 76.96 x 76.96 mm (1.63 x 3.03 x 3.03 in)
- TSO-C50c, RTCA/DO-214, RTCA/DO-160C approved
Specifications
Weight:
0.6 kg (0.42 lb)
Dimensions:
41.40 x 76.96 x 76.96 mm (1.63 x 3.03 x 3.03 in)
Power Supply:
28 VDC @ 150mA, maximum (each circuit)
Input Impedance:
600Ω, (15KΩ with gnd/bias jumper removed)
Output Impedance:
100Ω
Frequency Response:
flat within ±3dB from 300 to 6,000 Hz
Distortion:
<1% THD+N
Gain Range:
>12dB
Output:
4.5 Vrms (33mW) into 600Ω, current limited outputs
Mic Bias:
18 VDC @ 30mA, individually selectable
Enclosure:
conversion coated aluminum
Mounting:
bulkhead mount: four #8 screws
Temperature:
-55°C to 70°C
Altitude:
-15,000 to 70,000 ft
TSO-C50c, RTCA/DO-214, RTCA/DO-160C approved
Unit of Measure: EACH
Supplier/Manufacturer SKU: 247
Mil Spec, TSO, Certification:
HS Code: 8518.40.2000
HAZMAT:
UN#:
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