Honeywell Bendix/King KN 63, Installation Manual

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BENDIX/KING KN 63
Rev 4, October/2004 00176I04.TDC Page 3-1
SECTION III
OPERATION
3.1 GENERAL
It is recommended that power to the KN 63 be turned on only after engine start-up, as this proce-
dure increases the reliability of the solid state circuitry.
The rotary switch on the front of the KDI 572 has four positions: Off, N1, Hold, and N2. In the Off
position, the master and slave indicators and the remote mounted DME are all turned off. In N1
position, the DME is channeled from the NAV 1 control head. In N2 position, the DME is chan-
neled from the NAV 2 control head. In Hold position, the DME is channeled to the last selected
NAV 1 or NAV 2 frequency. To prevent the display of false information, the KDI 572 or KDI 574
will display dashes and the KN 63 will stay in "search" whenever power is turned on or momen-
tarily interrupted in frequency Hold mode. Normal operation is re-established by switching to N1
or N2 channeling.
The KDI 573 has no controls and merely provides a duplicate display of the information shown on
the KDI 572.
The KDI 574 requires an external panel mounted switch for ON/OFF, NAV 1, Hold, NAV 2 switch-
ing.
The KDI 572, KDI 573, and KDI 574 simultaneously display DME range, speed, and time-to-sta-
tion as shown in
Figure 3-1 . In addition a "1" is displayed in N1 mode and a "2" is displayed in N2
mode to indicate the selected channeling source on both indicators. In Hold mode, either a "1H"
or "H2" is displayed to indicate the channeling source that is being held. "RNV" will be displayed
when the displayed distance, speed, and time-to-station are derived from an Area Navigation Sys-
tem.
When the KN 63 is locked to a ground station, range is displayed to the nearest 0.1 nautical mile
from 0 to 99.9 nautical miles and to the nearest 1 nautical mile from 100 to 389 nautical miles.
Ground speed is displayed to the nearest knot from 0 to 999 knots. Time-to-station is displayed
to the nearest minute from 0 to 99 minutes. The indicators also show 99 minutes for any computed
time-to-station greater than 99 minutes. When the KN 63 is in search mode, dashes are displayed
instead of range, speed, and time-to-station.
Both indicators have an automatic dimming circuit that adjusts the brightness of the display to
compensate for changes in ambient light level. Dimming is controlled by a photocell mounted be-
hind the front panel below the display.
The audio output of the KN 63 can be set as high as 15 milliwatts into 500 ohms using the audio
level adjustment accessible through a hole in one of the inner covers. It is set for approximately
2mw output at the factory. It is desirable to use the audio to identify the DME ground stations being
received.
The effective range of the KN 63 DME depends on many factors; most important being the altitude
of the aircraft. When the aircraft is on the ground, the KN 63 usually will not receive DME stations
due to line-of-sight signal limitations. Other contributing factors to the DME's effective range are