The Becker AR4201 is no longer produced. It has been replaced by the Becker AR6201. These units are used and factory overhauled with a two year Becker warranty. Because of the small 2 1/4 in (57 mm) panel cutout it's ideal for small aircraft, especially gliders. The depth including connector is about 9 inches.
This VHF transceiver has been developed as a single block unit.
Mounting is by means of four screws (rear panel mounting). All controls and indicators
are located on the front panel. The rear of the unit holds the equipment
connector and the antenna socket. After it's switched on, the unit performs a self test. All segments of the display
flash during the self test. If faults are detected, the LCD (liquid crystal display)
displays a fault code for approximately five seconds. The VHF transceiver then
automatically activates the mode set before it was switched off.
The Becker AR4201 transceiver is fitted with a single superheterodyne receiver. A squelch
(muting) circuit suppresses transmitters or disturbances below a certain field
strength. The switching threshold can be set. The squelch function can also be
switched off. The transmitter is designed to be wideband over the 118.000 MHz to
136.975 MHz range. The transmitter output power is ³ 5 Watt. The sidetone is
automatically switched to the headphone output during transmission.
The microphone inputs are designed for both dynamic and standard microphones.
The inputs are connected to a dynamic volume compressor which keeps the
modulation voltage constant over a wide input voltage range. The frequency indication is by means of a liquid crystal display (LCD). The
required operating frequency is set using the MHz and kHz frequency selector
switches. The MHz rotary switch engages at 1 MHz steps and the kHz rotary
switch at 25 kHz steps. The VHF transceiver also contains a memory device
for storing 99 different frequencies which remain stored even with the unit
switched off without an auxiliary battery. The VHF transceiver also contains a monitoring stage for the supply voltage
which is activated when the VHF transceiver is switched on. If the supply
voltage drops below 10.5 V, the segments of the LCD begin to flash.