AR 3201 - ( )
rigid fuselage mounting in all aircraft. The VHF transceiver is designed for compliance with RTCA and EUROCAE airworthiness requirements.
1.3General description
The VHF transceiver is designed as a
The transceiver features a single superhet receiver. A squelch circuit suppresses noise and input signals below a specific field strength. The switching threshold is adjustable from without through the case. The squelch can be defeated with the squelch switch.
The transmitter has wideband tuning over the range 118.000 MHz to 136.975 MHz. Transmitter output power is greater than 5 watt. In transmitter operation sidetone is automatically on. In transceiver with serial No. of 4000 and above, an arrow flashes on and off in the upper left side of the LCD during transmission
The injection frequency of the receiver and the transmit frequency of the transmitter are generated by a
The microphone input is designed for a dynamic microphone or for a standard microphone, the transceiver being
The frequency indication is a liquid crystal display ( LCD). The MHz and kHz frequency selectors permit selection of the desired channel frequency. The MHz frequency selector indexes in steps of 1 MHz, the kHz frequency selector in 25 kHz steps.
The transceiver also contains a memory for storing four different channel frequencies, even when the transceiver is OFF. The stored frequencies are called up by the channel selector switch in positions 1 - 4. In switch position A a further channel frequency can be set which is, however, lost when the transceiver is switched off. In transceiver with serial No. fo 4000 or above, the channel frequency set in position A is also stored and not deleted when the unit is powerd down.
In addition, when the VHF transceiver is powered up, a
In Transceiver with serial No. of 4000 or above, either the most recently set frequency in channel A appears, or one of four stored frequencies (depending on the position of the channel celector switch). When the
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