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CAUTION:
AS AN ADDED PRECAUTION BEFORE THE FLIGHT, CHECK THE
ANTENNA. VSWR SHOULD BE CHECKED WITH AN IN-LINE TYPE
WATTMETER INSERTED IN THE COAXIAL TRANSMISSION LINE
BETWEEN THE TRANSCEIVER AND THE ANTENNA. ANY PROBLEM
WITH THE ANTENNA INSTALLATION WILL MOST LIKELY BE SEEN AS
A HIGH REFLECTED POWER. A VSWR OF 3:1 WILL RESULT IN A 25%
LOSS IN POWER.
To check the VOR/ILS system, select a VOR frequency within a forty nauti-
cal mile range. Listen to the VOR audio and insure that no electrical inter-
ference such as magneto noise is present. Check the tone identifier filter op-
eration. Fly inbound or outbound on a selected VOR radial and check for
proper LEFT-RIGHT and TO-FROM indications. Check the VOR accuracy.
NOTE: VOR Ground Station scalloping may be present
To check the localizer and glideslope functions, select an appropriate ILS
frequency and fly an approach to the proper runway. Check for proper
LEFT-RIGHT and UP-DOWN indications. The glideslope function will not
operate for units that do not have the glideslope receiver. Check section 1
for unit part numbers that have glideslope receivers.
(5)
Post-Installation Test (ADF Functionality)
A quick preliminary check can be made by tuning to a local AM broadcast
station or a strong NDB station. Check for satisfactory audio (this should be
done where clear reception is possible, preferably outside of the hanger).
(a)
Rev. 0, Aug/2006
©Honeywell International Inc. Do not print without express permission of Honeywell
Quadrantal Error Adjustments
The system has been factory adjusted to compensate for a typical
airframe. Therefore, little or no compensation should be required.
Nonetheless, the KTR 2280 provides software adjustment of Qua-
drantal Error (the average amount of quadrantal error (QE) that ex-
ists due to the shape of the airframe). The values for these align-
ments are stored within the aircraft system maintenance computer
and downloaded to the KTR 2280 on power up. If this download does
not occur the KTR 2280 uses the last values that were loaded. In
event that antenna skew and QE adjustment is required, follow the
procedure outlined below.
1.
Set the QE adjustment to 0.
2.
Tune in a nearby broadcast station, NDB, or compass locator
that gives a strong, clear signal free of fading. Position the air-
craft on the ramp in an area that is clear of surrounding build-
ings, such that the indicator points to 0 degrees (i.e., the air-
craft is heading directly toward the station). Note the aircraft
heading.
3.
Using the aircraft directional gyro or compass, turn the aircraft
to the left 45 degrees. Note the indicated relative bearing and
the amount of error. Continue to turn the aircraft, stopping ar
each 45 degree point and noting the relative bearing error.
KTR 2280 Preliminary H 08/17/06
Page 2-31
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