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Becker ATC 4401 Transponder
   

The ATC 4401 has been designed as a part of the Becker Compact Line for all aircraft and helicopters where small dimensions and light weight are essential. It has the same look and similar size as the successful transceiver AR 4201. The mounting behind the panel is as simple as for the AR 4201.

Outstanding performance combined with low power consumption is provided in two certified versions.
ATC 4401-250 with min. 250 Watt transmit power.
ATC 4401-175 with min. 175 Watt transmit power.

Both versions are state of the art design with fully transistorized transmitter and compliant with the current, most stringent operating standards. 

The ATC 4401 is of course certified according JTSO and TSO regulations. 

The sunlight readable display is illuminated for night operations. The display shows in addition to the transponder code also the current flight level, if an encoding altimeter is connected and Mode-C is selected. Despite the small size, the operation is simple and straight forward. It even allows the one button recall of two preselected codes. 

The ATC 4401 operates from 9.5 to 32.2 V DC. This makes it suitable for almost every application in general aviation.  A standard encoding altimeter or blind encoder can be connected. 

Specification, General:

 Supply voltage: 9.5 V to 32.2 V DC
 Typ. consumption
 (without panel illum.)		 0.50 A at 13.75 V (250 W),  0.40 A at 13.75 V (175 W),
0.30 A at 27.5 V (250 W),  0.25 A at 27.5 V (175 W).
 (in standby mode) 0.27 A at 13.75 ,  0.14 A at 27.5 V
 Panel illumination: ‹ 0.10 A at 13.75 V,  ‹ 0.05 A at 27.5 V
Power-up time:3 sec. (internal self-test)
Ext. fuse protection: 3 A slow-blow
Serial interface:RS 422 (9600 baud)
Operating temperature: - 20 °C to + 55 °C, (short-time + 70 °C)
Storage temperature: - 55 °C to + 85 °C
Operating altitude: 35000 ft. in accordance with, EUROCAE/RTCA ED-14D/DO-160D
Vibration resistance: Cat. NM in accordance with EUROCAE/RTCA ED-14D/DO-160D
Humidity:Cat. A / + 50 °C; 95 %, 48 h in accordance with EUROCAE/RTCA ED-14D/DO-160D
Mechanical dimensions:
Front panel		 61.3 x 61.3 mm (H x W)
(2.413 x 2.413 inch)
Case depth:204 mm (8.031 inch)
Weight:0.725 kg (1.598 lb)
Test assembly standards: RTCA DO-150 TSO/JTSO C74c, C88a, EUROCAE MPS/WG9/1-71

Receiver data:

 Operating modes: Mode A, Mode A+C
 Receive frequency: 1030 MHz ± 0.2 MHz
 Sensitivity (MTL): - 74 dBm (for 90 % reply rate)
 Selectivity: ± 15 MHz > 40 dB, ± 25 MHz > 60 dB
 Dynamic range: › 60 dB
 Bandwidth:± 3 MHz < 3dB
 Side lobe suppression: 3-pulse method 
 Nominal impedance: 50 ohms

Transmitter data:

 Transmit frequency: 1090 MHz ± 3 MHz
 Transmitter type: Solid state
 Transmit power: 175 W at antenna socket
 Reply limitation: effective as from 1200 replies / sec.
 Nominal output impedance: 50 ohms
 Reply code (mode A): ICAO coding system with 4096 reply possibilities
 Flight level code (mode C): ICAO coding system 100-foot steps from -1000 to 35000 ft.
 Transmit pulse shape: pulse width 0.45 ms ± 0.1 ms, rise time 0.05 to 0.1 ms, fall time 0.05 to 0.2 ms