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Operation; Operating Procedure; Kfs 586 Operation; Frequency Control - Honeywell BENDIX/KING KDF 806 Installation Manual

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3.1

OPERATING PROCEDURE

It is recommended that the KDF 806 unit be turned off when the aircraft engine is started in order
to prevent possible voltage transient damage to the radio. The unit is turned off by placing the
function switch in the OFF position. The KFS 586A turns the unit off by rotating the ON/Off/VOL
knob fully counterclockwise. The volume control adjusts the audio output for a comfortable listen-
ing level.
3.1.1

KFS 586 OPERATION

The KDF 806 Automatic Direction Finder has two operational modes. With the mode switch in the
ADF position, the unit is placed into the ADF mode and the loop antenna is enabled. The indicator
needle will point to the relative bearing of the selected station. To tell if there is a sufficient signal
for navigational purposes, the pilot can place the KDF 806 back into the ANT mode, parking the
indicator needle at 90° . When the unit is then switched to the ADF mode, the needle should slew
to the station bearing in a positive manner, without excessive sluggishness, wavering, or rever-
sals.
In the ANT mode, the loop antenna is disabled and the unit acts as a receiver, allowing audio re-
ception through the speaker or headphones. The indicator needle remains parked at the 90° rel-
ative position. This mode provides slightly clearer audio reception, and is used for station identi-
fication. In various parts of the world, some stations use an interrupted carrier for identification pur-
poses. A Beat Frequency Oscillator (BFO) function is provided to permit these stations to be more
easily identified. Placing the function switch in either of the BFO positions causes a 1000Hz tone
to be heard whenever there is a radio carrier signal present at the selected frequency.
3.1.2

FREQUENCY CONTROL

Standby Entry
The Standby frequency is read on the bottom of the display. It may be tuned by
turning the frequency selector control. Standby frequency tuning does not affect
the Active frequency. Depressing the Transfer button causes the Standby frequen-
cy to appear in the Active, or upper frequency location. To tune Standby frequen-
cy:
This method permits the pilot to tune to the desired frequency without the accom-
panying noise of tuning through other stations.
Rev. 6, Nov/2005
SECTION III

OPERATION

IN THE ADF MODE, THE AUDIO MUTING FEA-
TURE OF THE KDF 806 CAUSES THE AUDIO
OUTPUT TO BE MUTED UNLESS THE RECEIVER
IS LOCKED ONTO A VALID STATION. THIS RE-
DUCES INTERSTATION NOISE AND AIDS THE PI-
LOT IN IDENTIFYING NAVIGABLE STATIONS.
1.
Tune frequency of station desired.
2.
Push Transfer button
00511I06.JA
NOTE:
KDF 806 / KFS 586/586A
Page 3-1

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