Mariner 8000

Wave Bands:

• Beacon: 150 - 400 kHz
• Broadcasting: 535 - 1605 KHz
• Marine: 1600 – 3600 kHz
• FM: 88 – 108 MHz

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An automatic direction finder (ADF) is a marine or aircraft radio-navigation instrument that automatically and continuously displays the relative bearing from the ship or aircraft to a suitable radio station.

ADF receivers are normally tuned to aviation or marine NDBs (Non-Directional Beacon) operating in the LW band between 190 – 535 kHz. Like RDF (Radio Direction Finder) units, most ADF receivers can also receive medium wave (AM) broadcast stations, though these are less reliable for navigational purposes.

The operator tunes the ADF receiver to the correct frequency and verifies the identity of the beacon by listening to the Morse code signal transmitted by the NDB.

On marine ADF receivers, the motorized ferrite-bar antenna atop the unit would rotate and lock when reaching the null of the desired station. A centerline on the antenna unit moving atop a compass rose indicated in degrees the bearing of the station.

The ADF operates without direct intervention and continuously displays the direction of the tuned beacon. The correct direction must be verified from its 180-degree opposite.

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