SYSTEM INSTALLATION MANUAL
KTR 2280A
Page 2-49
15 May 2017
© Honeywell International Inc. Do not copy without express permission of Honeywell.
identifier filter operation. Fly inbound and 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.
2.4.2.3 ADF RECEIVER FLIGHT TEST
Confirm that bearing indications to several local NDB facilities appear reasonable. Listen to the ADF
audio and ensure that no unusual electrical interference is present.
2.5 KTR 2280A INSTALLATION PARAMETER MODIFICATIONS
The KTR 2280A has several parameters that can be adjusted during installation in order to conform the unit to
a given installation. Parameter modifications must only be performed
by a qualified avionics technician. Table 2-7 Unit Parameters, lists the KTR 2280A adjustments accessible by
the technician to facilitate the unit installation.
NOTE: KTR 2280A units sent to the factory for repair will be returned to service with their factory defaults
reset as shown in Table 2-7 Unit Parameters.
The method for setting these parameters is a function of the specific installed system and the user interface used
for personality module settings. Refer to the appropriate STC Installation Manual for specific instructions. The
KTR 2280A responds to installed system personality module settings through high speed ARINC 429 labels
300, 301, 302, and 303. These labels occur periodically at a 1 Hz rate.
Table 2-7 Unit Parameters
T
NOTE: 1: This setting represents attenuation (in dB) relative to rated audio output level.
NOTE: 2: This setting is a relative number only. Each numeric value represents a change of 1.5 dB.
Nominal setting, which represents the level provided by typical microphones, is the default
Parameter
MMDR Factory
Default
Minimum
Setting
Maximum
Setting
Resolution
COM Carrier Squelch (-dBm)
88
85
100
1
COM Emergency Freq. (MHz)
121.500
118.000
136.990
*
COM Emergency Volume (dB)
1
20
0
72
1
COM Sidetone Level (dB)
1
52
0
72
1
COM Squelch (SNR dB)
12
3
20
1
COM Microphone Gain
2
21
0
31
**
QE Offset (degrees)
0
-20
+20
0.1
* 8.33 kHz channel spacing
** Each resolution increment is equivalent to 1.5 dB. Total range is -31.5 dB to 15.0 dB
