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Description. There are two display windows






There are two display windows. There is an active display and a standby display. The transfer button that is between the display windows transfers the frequency in the standby window to the active window. The frequency selector changes the frequency in the standby window.

The mode selector selects either the ADF mode or the antenna (ANT) mode. The selected mode shows in the display windows. In the ADF mode, the receiver processes the bearing data and the station audio. In the ANT mode, the receiver only processes the station audio.

The tone selector turns on the beat frequency oscillator (BFO) in the ADF receiver. There are some ADF stations that turn their transmitters on and off to transmit their morse code station identifier. To process this type of signal, the receiver must be in the BFO mode.

Antenna Inputs

The loop antenna contains two identical antenna loops (sine and cosine) that are mechanically displaced ninety degrees from each other and share a common ferrite core. The sense antenna and loop antenna sine and cosine outputs are coupled through an L- band filter and static protection circuit. The signals then go to separate but identical low noise, wide dynamic range FET input amplifiers. The antenna outputs go to the antenna modulators in the ADF receiver.

ADF Control Panel Inputs

The ADF receiver system processor receives manual tune inputs and control panel mode selections from the ADF control panel on an ARINC 429 data bus.

PSEU

The proximity switch electronics unit (PSEU) sends an air ground discrete to the system processor. The discrete sets the flight leg count for the fault memory.


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