AlliedSignal KMA 24 audio panel Installation manual

 7
AlliedSignal
ELECTRONIC AND AVIONICS SYSTEMS
INSTALLATION MANUAL
BENDIX /KING®
KMA 24
AUDIO PANEL/MARKER
BEACON RECEIVER
MANUAL NUMBER 006-00180-0001
REVISION 1 JANUARY, 1982
WARNING
Information subject to the export control laws. This document, which includes
any attachments and exhibits hereto, contains information subject to
International Traffic in Arms Regulation {ITAR) or Export Administration
Regulation (EAR) of 1979, which may not be exported, released or disclosed to
foreign nationals inside or outside the U.S. without first obtaining an export
license. Violators of ITAR or EAR may be subject to a penalty of 10 years
imprisonment and a fine of $1,000,000 under 22 U.S.C. 2778 or Section
2410 of the Export Administration Act or 1979. Include this notice with any
reproduced portion of this document.
COPYRIGHT NOTICE
©1936 AlliedSignal, Inc.
Reproduction of this publication or any portion thereof by any means without
the express written permission of AlliedSignal Commercial Avionics Systems is
prohibited. For further information contact the Manager, Technical
Publications, AlliedSignal Commercial Avionics Systems, 400 North Rogers
Road, Olathe, Kansas, 66062. Telephone: (913) 782-0400.
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
TABLE OF CONTENTS
SECTION |
GENERAL INFORMATION
Paragraph
1.1 Introduction
1.2 Equipment Description
1.3 Technical Characteristics
1.4 Units and Accessories Supplied
1.5 Accessories Required but Not Supplied
1.6 License Requirements
2.1 General Information |
2.2 Unpacking and Inspecting Equipment
2.3 Installation Procedures
2.3.1 Avionic Cooling Requirements For Panel Mounted Equipment
2.3.2 Mounting Rack Installation
2.3.3 Antenna Installation
2.3.4 Cable Harness and Connector Assembly
2.3.4.1 Molex Connector Assembly
2.3.5 KMA 24 Installation
2.4 Post Installation Check
3.1 KMA 24 Operation
3.1.1 Marker Beacon Receiver
3.1.2 Isolation Amplifiers
Figure
1-1 KMA 24 Panel Combinations
2-1 Molex Terminal and Tools (3 sheets)
2-2 Outline and Mounting Drawing
2-3 Installation Assembly
2-4 KA 23 Antenna Outline and Mounting Drawing
2-5 KMA 24 Pin Functions
2-6 KMA 24 Interconnect 00 and 01
2-6 KMA 24 Interconnect 02 and 03
2-7 KMA 20 Replacement Pin Functions (2 sheets)
Rev. 1, January, 1982
I1M00012-8
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2-7
2-9
2-11
2-13
2-15
2-17
2-19
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
SECTION |
GENERAL INFORMATION
1.1 INTRODUCTION
This manual contains information on the mechanical and electrical characteristics of the King Radio
Corporation KMA 24 Audio Panel with Marker Beacon Receiver.
1.2 EQUIPMENT DESCRIPTION
The KMA 24 is a compact, fully TSO'd solid state unit containing a pushbutton audio selector panel,
speaker and headphone isolation amplifiers, and a marker beacon receiver. The unit has a low 1.3 inch
profile for minimum panel area requirements. The KMA 24 is styled to harmonize with the other King Radio
Silver Crown units but can also be efficiently integrated into any 500 ohm output audio system.
KMA 24 models are available with or without the AUTO selection feature. Customers with installations
using comm transceivers without a frequency transfer (KX 170 series) will prefer the AUTO feature. Those
with comm transceivers with a frequency transfer (KY 196) will likely prefer the added flexibility of an
extra audio input.
Figure 1-1 shows each of the audio panel combinations available. The choice is between a third MIC
function that can be either HF or TEL, and between AUTO and a second ADF.
As many as three transceivers and six receivers including the internal marker beacon receiver can be
controlled by the KMA 24. The unit also has two unswitched inputs for use as altimeter warning and
telephone ringer. The KMA 24 has outputs for ramp hailer and passenger address, or intercom as desired.
An 8 ohm tap is provided on the secondary of the audio output transformer to provide maximum power
transfer in installations using 8 ohm speakers.
Separate isolation amplifiers are provided for headphones and speaker to provide isolation even when the
same source is selected for both headphones and speaker. Aircraft power for the headphones and speaker
isolation amplifiers is derived from separate sources to provide a high degree of audio integrity. Power
to the speaker amplifier can be switched off from the front panel but the headphone amplifier is always
on. The speaker output is muted when the MIC key is pressed to transmit. In the INT (Internal or
Intercom as applicable) and EXT MIC selector modes, all the audio inputs are muted to the speaker while
the microphone is keyed. A PA mute output is provided to mute passenger background music systems in the
INT MIC selector position.
Three isolated 16 ohm resistors are provided for transceiver speaker output loads.
The KMA 24 Marker Beacon Receiver presentation uses three colored lenses (white, blue, and amber) with
the letter designations A-0-M engraved on the lens for visual station passage indication. In addition,
the appropriate marker audio tone can be selected. HI-LO sensitivity and lamp test may be selected on
pushbuttons adjacent to the marker beacon lights. Provision is made for driving remote marker beacon
tights such as those in the King KI 285 Autopilot Annunciator Panel or KA 40 Remote Marker Beacon light
display. KMA 24 Marker Beacon lights are automatically dimmed to compensate for ambient cockpit lighting
conditions.
The KMA 24 will operate from either 14VDC or 28VDC aircraft power systems with no wiring changes
required. The panel lighting (other than the marker beacon lights) is powered by the aircraft light
dimmer buss. Both 14VDC or 28VDC light dimmer systems are accommodated by installation wiring options.
IM0012-2 Page 1-1
IM0012-2
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
FIGURE 1-1 KMA 24 PANEL COMBINATIONS
MK SPEAKER ! COM1 COM2
$ + + + + + + + + + + НЕ INT
Hi OFF
To] HE 1COM2 1 NAV2 + DME MKR 1 ADF2 , EXT
S
N + + + + + + + + + +
$ jl PHONE - MIC KMA 24 TSO
066-1055-00
Гм SPEAKER 1 COM1 COM2
3 , + + + + + + + + + ore nr
|
Ta] TEL 1 COM 2 1 NAV2 + DME MKR 1 ADF 2 +
$
É + + + + + + + + + +
\ $ J 1 PHONE 1 MIC KMA 24 TSO
066-1055-01
ee 1 SPEAKER ' COM1 COM2
$ + + + + + + + + + + E INT
HI |
Tol WF. 1COM2 1 NAV2 + DME MKR ADF AUTO ‚ ENT
$
ко + + + + + + + + + +
L_ $ _ PHONE | MIC KMA 24 TSO
066-1055-02
г мб р SPEAKER | COM1 COM2
5 + + + + + t + + ' * TEL INT
OFF EXT
т TEL 1 COM 2 1 NAV 2 + DME -MKR ADF AUTO 4
$ Lo]
À + + + + + + + + + +
| S J PHONE 1 MIC KMA 24 TSO
066-1055-03
Page 1-2
>) 1.3 TECHNICAL CHARACTERISTICS
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
GENERAL
SPECIFICATION
CHARACTERISTIC
TSO COMPLIANCE:
MARKER BEACON RECEIVER:
AUDIO AMPLIFIER:
APPLICABLE DOCUMENTS:
WEIGHT:
PHYSICAL DIMENSIONS:
DESIGN:
CONTROL:
DUTY CYCLE:
POWER REQUIREMENTS:
KMA 24 idle with MIC switch off:
KMA 24 idle current:
KMA 24 max operating current:
(with 3 internal and 3 external marker
Lamps illuminated)
Instrument Lights:
TEMPERATURE RANGE:
POWER OFF FUNCTION:
TSO C35d, Class A
Env. Cat. /A1D1/A/PKS/XXXXXXZBAAA
TSO C50b
Env. Cat. /A1D1/A/PKS/XXXXXXZBAAA
RTCA DO-143, DO-78A, DO-160
1.7 LBS (0.77 kgm)
Length behind panel: 6.81 in. (17.30 cm)
Height: 1.3 in (3.30 cm)
Width: 6.25 in. (15.88 cm)
ALL solid state
Panel mounted. All operating controls are on
the front panel of the unit.
Continuous
14V 28V
Less than 8mA Less than 16mA
110mA 170mA
1.9 AMPS 1.9 AMPS
360mA 1 80mA
-20%c to +55% with short time operation at
+70 C.
Removes power from speaker amplifier and
marker beacon receiver but not from headphone
amplifier
MARKER BEACON RECEIVER
SPECIFICATION
CHARACTERISTIC
FREQUENCY:
SENSITIVITY:
SELECTIVITY:
INPUT IMPEDANCE:
OUTPUT:
EXT LAMP OUTPUT:
Crystal-controlled at 75MHz
LO 1000uY hard
HI 200uV hard
6dB at +10KHz min
40dB at +200KHz max
50 ohm
Capable of 4 milliwatts into isolation
amplifier input of 500 ohms
125mA max each bulb
Rev. 1, January, 1982
IMOO1 2-2
Page 1-3
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
ISOLATION AMPLIFIERS
SPECIFICATION CHARACTERISTIC
INPUTS: Models without the AUTO function accomodate
three transceivers and five external
receivers.
Models with the AUTO function accomodate three
transceivers and four external receivers.
In addition, all models have an internal
marker receiver and two unswitched inputs.
INPUT SELECTOR SWITCHES: Each switched audio input has two switches
associated with it - one for speaker and one
for headphones. Each switch has two
positions; on and off.
INPUT IMPEDANCE: | 500 ohms
INPUT ISOLATION: 40dB between inputs
INPUT MUTING: At least 55dB when the mic is keyed.
SPEAKER OUTPUT:
With 13.75V supply: Into 4 ohm Load: 7 watts
Into 8 ohm load: 4 watts
With 27.5V supply: Into 4 ohm load: 12 watts
Into 8 ohm load: 6.5 watts
HEADPHONE OUTPUT: 50 milliwatts into 500 ohm load
DISTORTION: Less than 5% at rated output
FREQUENCY RESPONSE: Within 6dB from 350Hz to 6000Hz
1.4 UNITS AND ACCESSORIES SUPPLIED
A. King KMA 24 (KPN 066-1055-0X)
See Figure 1-1 to identify the Last digit in the part number.
В. KMA 24 Installation Kit (KPN 050-1780-00/02)
This installation kit is provided with each unit and consists of the following:
SYMBOL PART NUMBER DESCRIPTION QUANTITY
008-0041-00 Lug Solder Dual 1
P241 030-1094-58 Conn 44 Pin 1
030-1107-46 Pins 1
047-4940-02 Mounting Rack 1
089-2013-37 Nut Hex 6-32 2
089-2191-22 Nut Hex 6-32 2
089-2353-01 Clip Nut 6-32 6
089-5903-07 Screw PHP 4-40 7/16 2
089-5907-08 Screw PHP 6-32 1/2 2
089-6012-08 Screw FHP 6-32 1/2 6
091-0072-03 P-CLip Adj 1
Rev. 1, January, 1982
IM0012-2 Page 1-4
KING
KMA 24
>) AUDIO PANEL/MARKER BEACON RECEIVER
1.5 ACCESSORIES REQUIRED, BUT NOT SUPPLIED
A. A standard type (50 ohm) Marker Beacon Antenna such as the King KA 23 (KPN 071-0121-00) and
cable (RG-58A/U)
B. Speakers as required (4 or 8 ohm desirable)
C. Headphones (500 ohm impedance desirable)
D. Microphones
E. Interconnect Wiring
1.6 LICENSE REQUIREMENTS
None
IMOO12-2 Page 1-5
_)
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
SECTION II
INSTALLATION
2.1 GENERAL INFORMATION
This section contains interconnect diagrams and mounting dimensions as well as suggestions and other
information pertaining to installation. The KMA 24 installation will vary somewhat depending on
equipment configuration, type, location, and other factors. Cable harnesses will be fabricated by the
installing agency to suit the various needs.
2.2 UNPACKING AND INSPECTING EQUIPMENT
Exercise extreme care when unpacking the equipment. Make a visual inspection of the unit for evidence of
damage incurred during shipment. If a claim for damage is to be made, save the shipping container to
substantiate the claim. The claim should be promptly filed with the transportation company. It would be
advisable to retain the container and packaging material after all equipment has been removed in the
event that equipment storage or reshipment should become necessary at a later date.
2.3 INSTALLATION PROCEDURES
NOTE
See Figure 2-5 before wiring cable harness.
NOTE
If all the speakers in an installation are 8 ohm, then F202 should
be changed to the 8 ohm position. If any of the speakers are 4
ohm then F202 should be Left in the 4 ohm position.
The KMA 24 may be rigidly mounted in any location with adequate area for the front panel and depth behind
the panel for the unit, connector, and wiring harness. However, since the KMA 24 is shorter than a
transceiver, it is normally mounted at the top of a stack of radios. The sloping top at the rear of the
KMA 24 promotes this "top of the stack" installation.
2.3.1 AVIONICS COOLING REQUIREMENTS FOR PANEL MOUNTED EQUIPMENT
The greatest single contributor to increased reliability of all modern day avionics is to Limit the
maximum operating temperature of the individual units. While modern day individual circuit designs
consume much less electrical energy, the watts per cubic inch dissipated within avionics units remains
much the same due to high density packaging techniques utilized. Consequently, the importance of
providing avionics stack cooling is still with us.
While each individual unit may not required forced air cooling, the combined heat load of several units
operating in a typical avionics stack will significantly degrade the reliability of the avionics jf
provisions for stack cooling are not incorporated in the initial installation. Recommendations on stack
cooling are contained in King Radio Installation Bullentin #55. Failure to provide stack cooling will
certainly Lead to increased avionics maintenance costs and may void the King Warranty.
2.3.2 MOUNTING RACK INSTALLATION
A. Make the panel cutout as shown in Figure 2-2.
B. Mark, punch, and drill the holes for the mounting rack. See Figure 2-2 for the hole
- locations.
C. Secure the mounting rack to the instrument panel. The rear of the rack should be attached to
the airframe by means of support brackets.
Rev. 1, January, 1982
1М001 2-5 Раде 2-1
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
2.3.3 ANTENNA INSTALLATION
The antenna should be mounted on a flat surface on the underside of the aircraft fuselage near the
centerline of the aircraft. The antenna centerline should be parallel to the aircraft centerline. Avoid
Locations close to high power antennas.
Mount the KA 23 with two #10-32 x 5/16 machine screws. See Figure 2-4 for KA 23 mounting dimensions.
2.3.4 CABLE HARNESS AND CONNECTOR ASSEMBLY
The KMA 24 uses a special connector that mates directly with the printed circuit board inside the unit.
A plastic cable tie is provided in the installation kit to provide strain relief and can be installed on
either side of the mounting rack to route the cable harness either direction.
NOTE
Some of the KMA 24 pin functions vary depending on the flavor of
the unit. See Figure 2-5. Be sure to use the correct
interconnect drawing for the unit being intalled (Figures 2-6 and
2-6A).
How and where grounds are tied together is very important in an audio panel installation. It is
desirable for all audio grounds to come together at one common point and this common point should be
inside the audio amplifier. Ideally twin shielded Lead wire should be used for all 500 ohm audio Lines
from radios that have separate audio grounds and single Lead shielded wire should be used for all other
500 ohm audio Lines. In all cases the shield on these Lines should be grounded on the Load end only (the
KMA 24 end). The interconnect drawings indicate the use of shielded wire. Unshielded wire can be used
for these audio lines, however noise immunity and isolation between audio inputs will suffer accordingly.
Speaker and headphone ground return Lines are also desirable but when used should be kept separate from
all other grounds and connected to pin 22 on the KMA 24 rear connector. Pin Z of the KMA 24 should be
connected directly to the airframe with a short heavy wire (at least #18AWG). ALL other grounds should
be connected to pin 1 of the KMA 24. A solder tug is provided on the rear of the KMA 24 installation
rack to be used as a collection point for all grounds that are to be connected to pin 1. If shielded
wire is used for the audio inputs, the shields should all be tied together and kept separate from the
audio grounds until they are brought together at the solder lug.
The two power input Lines should be supplied through separate circuit breakers or fuses in the aircraft.
Pin 7 supplies power to the headphone amplifier while pin 20 supplies power to the speaker amplifier and
marker receiver. Separate circuits will therefore prevent the total loss of audio if one circuit should
open.
NOTE
Many transceivers have a 4 ohm output for driving a cabin speaker.
These outputs must be terminated with the speaker loads provided
in the KMA 24.
2.3.4.1 Molex Connector Assembly (Figure 2-1)
a. Solderless Contact Terminal Assembly using Molex Crimper
Refer to instructions in Figure 2-1.
b. Solderless Contact Terminal Assembly using Pliers
(1) Strip each wire 5/32" for contact terminal (KPN 030-1107-XX). (The last two digits of
the contact terminal part number indicate the number of terminals furnished).
(2) Tin the exposed conductor.
Rev. 1, January, 1982
I1M0012-3 Page 2-2
>
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
(3) Using needle nose pliers, fold over each conductor tab in turn, onto the exposed
conductor. When both tabs have been folded, firmly press the tabs against the
conductor.
(4) Repeat step 3 for insulator tabs.
(5) Apply a small amount of solder (using minimum heat) to the conductor/tab connection to
assure a good electromechanical joint.
с. Contact Insertion into Molex Connector Housing
(1) After the contact terminals have been installed on the wiring harness, the contact
terminals can be inserted into the proper location in the connector housing (KPN
030-1094-53). The terminal cannot be inserted upside down. Be sure to push the
terminal all the way in, until a click can be felt or heard.
(2) The self-locking feature can be tested by gently pulling on the wire.
d. Extraction of Contact from Molex Connector
(1) slip the flat narrow blade of a Molex contact ejector tool, HT-1884 (KPN 005-2012-11),
under the contact on the mating side of the connector. By turning the connector upside
down one can see the blade slide into the stop.
(2) When the ejector is slid into place, the locking key of the contact is raised, atlowing
the contact to be removed by pulling moderately on the lead.
(3) Neither the contact or position is damaged by removing a contact; however, the contact
should be checked visually before reinstalling in connector, to be certain that
retaining tab "A" extends as shown (see Figure 2-1) for retention in connector.
2.3.5 KMA 24 INSTALLATION
NOTE
A. Slide the unit into the mounting rack until the Locking screw
contacts the rear of the mounting rack.
B. Insert a 3/32" Allen wrench through the hole in the front
panel and turn clockwise until the unit is secure in the
mounting rack. Do not overtighten.
C. For removal, turn the locking screw counter-clockwise until
the unit disengages from the mounting rack.
2.4 POST INSTALLATION CHECK
CAUTION
BEFORE FLIGHT TEST CHECK ALL AIRCRAFT CONTROL MOVEMENTS TO ENSURE
THAT WIRING HARNESSES DO NOT INTERFERE WITH THEIR OPERATION.
An operation performance flight test is recommended after the installation is complete to ensure
satisfactory performance of the equipment in its normal environment.
Four volume adjustments can be made through the top cover of the KMA 24:
« Marker audio output volume
. Cabin speaker volume
. Headphone volume
. Internal and external speaker and intercom volume
COD >
Rev. 1, January, 1982
1M0012-3 Page 2-3
Rev. 1, January, 1982
IM0012-3
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
INSULATOR CRIMP
CONDUCTOR CRIMP
SOLDERLESS CONTACT TERMINAL
KPN 030-1107-30
alll.
TY | \ — Ÿ
Bama
<.. A
HAND EJECTOR
KPN 047-5099-01
MOLEX PN HT-1884
FIGURE 2-1 MOLEX TERMINAL AND TOOLS
(Dwg. No. 696-6333-00, R-1)
(Sheet 1 of 3)
Page 2-4
KING
KMA 24
> AUDIO PANEL/MARKER BEACON RECEIVER
Holding the hand crimpers as shown, release the crimper's ratchet pawl ard open by squeezing tightly
on the handles, and then releasing pressure.
HAND CRIMPER
KPN 071-6041-00
MOLEX P/N 6115
Close crimpers until ratchet begins to engage. Then insert the terminal into the jaws from the back
side. (See Figures at bottom of page) For 24 to 30ANG wire, it will be necessary to start the crimp
in jaw A and then complete it in jaw B.
| JAW TERMINAL WIRE SIZE INSULATION RANGE
A 030-1107-30 18 to 24 AWG .110 to .055
B 030-1107-30 24 to 30AWG .055 to .030
— WIRE STOP
TERMINAL
—!
Terminal is in correct position when insulation tabs are flush with outside face of crimp jaws.
2) FIGURE 2-1 MOLEX TERMINAL AND TOOLS
(Sheet 2 of 3)
1М001 2-3 Page 2-5
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
Once the terminal is in the correct position, close the jaws gently until the terminal is held loosely
in place. Push wire stop down so that it rests snugly behind the contact portion of the terminal.
Strip the wire insulation back 1/8 inch and insert the wire through the insulation tabs into the
conductor tabs until the insulation hits the conductor jaw face or until the conductor touches the
wire stop.
a
E
WIRE STOP
es
=
CONDUCTOR JAWS
CONDUCTOR JAW FACE
Squeeze the handles until the crimp jaws close and the ratchet releases.
Straighten the terminal if necessary, then release the plier grips and remove the crimped terminal.
CRIMPING PRESSURE ADJUSTMENT
If too much or too little pressure is needed to release the crimper's ratchet pawl at the end of
the crimp stroke, the ratchet can be easily adjusted. A spanner wrench provided with the tool can
be used to loosen the lock nut, and rotate the keyed stud clockwise for increased pressure and
counter-clockwise for decreased pressure. Once the desired pressure has been set, the lock nut
must be tightened again. Newer models may have a screwdriver adjustment.
KEYED STUD
SPANNER WRENCH
LOCK NUT
(OPPOSITE SIDE)
FIGURE 2-1 MOLEX TERMINAL AND TOOLS
(Sheet 3 of 3)
IM0012-3 Page 2-6
7
NOTES:
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
о au LS см
. DIMENSIONS IN ( ) ARE IN CENTIMETERS.
. WEIGHT: 17 LBS.(0771 Kg)
. TOLERANCES FOR PANEL CUTOUTS: *0I0 (+025)
‚ КМА 24: 2630 (6.68) CG, KMA 24H:2780(706)CG.
- KMA 24: 3300 (838) CG, KMA 24H:3.560(9.04) CG.
- WHEN INSTALLING TWO OR MORE PANEL MOUNTED UNITS
IN A STACK, THE MOUNTING TRAYS SHALL BE SPACED .050
INCHES (127 CM.) APART. NEWER STYLE MOUNTING TRAYS
4.340 SAME FOR LOCKING SCREW | LOCKING SCREW
(11.02) 500 KMA 24
WIRE BUNDLE ; OR
(1.27) KMA 24H
E y an — - SPLANLE FLEA iL oe
' —©-E —, El NO “AC ERE -
920 a ий (1 52) > NAV2 DME MKR ) AOF2 Ke EX” vn. LURK 1 NAV 2 OME ©MKR 1 ADF 2 и O TT
(2.34) "TR © —— o IM EEE di => NEAR,
1 | 350
La 5.250 437 (0.89)
(1.91) (0.51) - (15.88 }
КМА 24 KMA 24H
6485 FRONT VIEW FRONT VIEW
‚325 —» kt 16 47 -
(.826) (16.47)
lt— SEE NOTE ——
4
CUTOUT DIMENSIONS FOR BEHIND doo
i .
AIRCRAFT PANEL MOUNT ра
SEE
NOTE 5 5.188 N
- 000 (-.000) (1572)
6.290 (SEE NOTE 7)
(15.98)
CUTOUT DIMENSIONS FOR FRONT 1350
AIRCRAFT PANEL MOUNT (3.429)
HAVE HAD .025 INCH (063 CM) DIMPLES BUILT IN, TOP AND
BOTTOM, BOTH SIDES,SO THAT TWO NEW STYLE TRAYS
WILL AUTOMATICALLY BE SPACED PROPERLY.
TO DETERMINE STACK HEIGHT,USE THE HEIGHT DIMENSION
FOR A FRONT AIRCRAFT PANEL MOUNT,
FIGURE 2-2 OUTLINE AND MOUNTING DRAWING
(Dwg. No. 155-5321-00, R-4)
Rev. 1, January, 1982
1М001 2-3
1.025
(2.60)
Page 2-7
| € 6.320
(16.052)
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
089-2191-2 2 (2)
089-2013-37 (2)
— 091-0072-03
047-5860-01
BD
008- 0041-00
ABCDEFHJKLMNPRSTUVWX YZ
[O Co AAA ©
1 2345679839 1011 121314 IS 16 17 18 19 2021 22
д КМА 24 030-1094-05
FRONT VIEW CONNECTOR BODY
e 0 047- 4940-04 POLARIZER KEY 030-1094-58
089- 6012-08 и 030- 1096-00, BETWEEN CONNECTOR WITH POL ARIZER KEY
„”
(6 PLACES) A > =
089-5907-12 (2) S | A BCDEFH JKLMNPRSTUVWXYZ
` 2 Г wr we ara) ©
> ~_ >, Por na ia a a
- 030-1107-46 DD
POLARIZING KEY
SHOWN IN POSITION FOR KMA 24. 089. 2353-0! | 234567 fs 1011 12131415 1617 18 19202122
SEE FRONT VIEW FOR KMA 24H CLIP NUTS, 6-32
POLARIZING KEY POSITION. ; (6 PLACES) KMA 24H 030-1094-05
и 030- 1094-58 (KMA 24) POLARIZER KEY FRONT VIEW CONNECTOR BODY
030-1094-65 (KMA 24H) 0-1096-00, BETWEEN 030-1094-65
030-1096-00, BE E CONNECTOR WITH POLARIZER KEY
TERMINAL SLOTS 8 AND 9.
089-5903-07 (2)
) FIGURE 2-3 INSTALLATION ASSEMBLY
— (Dwg. No. 155-5322-00, R-4)
Rev. 1, January, 1982
1M0012-3 Page 2-9
IM0012-3
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
1.94
(4.92)
1. sa N > 45 NOTE:
RUBBER GASKET BNC. JACK ho (6.22) » ALL DIMENSIONS IN
PARENTHESIS ARE IN
CENTIMETERS.
10.0
(25.4)
.22 DIA. 2 HOLES ‚75 DIA.
(.56)
1.34
(3.40)
| BOTTOM VIEW
6.69 . | 47 OF ANTENNA.
(16.99) or (3.73)
FIGURE 2-4 KA 23 ANTENNA OQUTLINE AND MOUNTING DRAWING
(Dwg. No. 696-0012-00, R-0)
Page 2-11
K
M
| А
|
| 2
| 4
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
L —mo io
1M001 2-3
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
FIGURE 2-5 KMA 24 PIN FUNCTIONS
(Dwg. No. 696-0150-00, R-0)
J241
-00 -0l -02 -03
J HF 500.0.INPUT —+—- TEL 500 0.INPUT—— HF SOOLÑLINPUT ——TEL 500.0 INPUT —
K HF MIC AUDIO ——TEL MIC AUDIO —1— HF MIC AUDIO TEL MIC AUDIO —
15 HF MIC KEY —+— TEL MIC KEY —— HF MIC KEY —4— TEL MIC KEY —
$ ADF | 500.n_INPUT——— ADF | 500 a INPUFH— ADF 500.n_INPUT—— ADF 500. INPUT —
H ADF 2 500.n.INPUT-—— ADF 2500.02 INPUT-— NO CONNECTION — NO CONNECTION —
CJ 201 IN INPUT CJ 201 IN INPUT CJ 201 IN AUTO CJ 201 IN AUTO
POSITION POSITION POSITION POSITION
м HF SPEAKER LOAD | NO CONNECTION “| HF SPEAKER LOAD | NO CONNECTION —]
9 COM | 500 INPUT
P COM | MIC AUDIO
R COM | MIC KEY
10 COM 2 500. INPUT
H COM 2 MIC AUDIO
у COM 2 MIC KEY
12 NAV 1500.24. INPUT
13 NAV 2 500.0. INPUT
6 DME 500.0 INPUT
19
Е COM | SPEAKER LOAD
o ) COM 2 SPE AKER LOAD
T ALTIMETER WARNING
7 TEL RINGER
W CABIN SPEAKER
U INTERNAL SPEAKER
X EXTERNAL SPEAKER
18 PA MUTE
Y MIC KEY IN
6 MIC AUDIO IN
3 HEADPHONES
с WHITE LAMP
| 5 BLUE LAMP TO REMOTE MARKER LIGHTS
4 AMBER LAMP
2 MIDDLE MARKER SENS
м ‘} MARKER ANTENNA
7 ГА — 14/28V AIRCRAFT POWER | THESE SHOULD BE SUPPLIED THROUGH
20 3A 14/ 28V AIRCRAFT POWER | TWO SEPARATE AIRCRAFT CIRCUITS.
| GROUND
22 SPEAKER GROUND
+ AIRFRAME GROUND
F 28V INSTRUMENT (3) LIGHTS
D [4V INSTRUMENT LIGHTS
E INSTRUMENT LIGHTS GND
21 SPARE
Page 2-13
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
p2ael
Г BB Foe
, (IF REQUIRED) NOTES
| 4 == НЕ БРЕАКЕК СОАО SPEAKER OUT THE KX 145 500 OHM OUTPUT IS PIN [2 BUT IF
N | PIO TRANSMIT SIDE TONE IS DESIRED, PINS 12 8 13
OF THE KX 145 MUST BE SHORTED TOGETHER
17 TEL RINGER RINGER AUDIO HI 2 AND PIN 16 (500.n HEADPHONE) USED AS THE
KT 96
ен GROUND LUG AUDIO LO Fra 3 AUDIO 500.1 AUDIO INPUT TO THE KMA 24.
| J Li HF/TEL 500.4 IN RCVR AUDIO Hi-————————4 4 | KING 500 a 2. PINS J,K,AND 15 ARE USED FOR HF RECIEVER
x oe OR CONNECTIONS ON THE -00 FLAVOR AND FOR
SEENOTE 2 | К TT HF/TEL MIC AUDIO MIC AUDIO +r 10 PHONE MIC RADIO TELEPHONE CONNECTIONS ON THE -OI FLAVOR.
15 +=} — MIC KEY = Ki (032-0008-00 i4V)
| § HF/TEL MIC KEY MIC PTT 9 С ке „Ol 28V 3. ALL SHIELDS SHOULD BE GROUNDED ON ONE
' | END ONLY. THE END THAT 1S GROUNDED SHOULD
| 19 = COM | SPEAKER LOAD Ре | | ‘К + BOOM MIC ALWAYS BE THE LOAD END AS SHOWN.
L J P1961 J SPEAKER OUT remind 41 1 | 4 SPEAKER AND HEADPHONE GROUND RETURNS
N \ | N.C. MUST BE KEPT SEPARATE FROM OTHER GROUNDS.
| +A GROUND LUG AUDIO LO { 2 K Y 21 ! ( THEY SHOULD BE CONNECTED TO PIN 22.
9 Li COM I 500.0 IN 500.1 OUTPUT e сом 500.5 OUT Ca | PIN Z MUST BE CONNECTED TO AIRFRAME
2 = 12] 196/197 KX { GROUND WITH A SHORT, HEAVY (818 AWG) WIRE.
—
| P f= COMM | MIC AUDIO MIC AUDIO fi El com MIC AUDIO 1199 ALL OTHER GROUNDS SHOULD BE CONNECTED
. R t= COM | MIC KEY MIC KEY + 4 | MIC KEY 140] 170/7175 I TO PIN | AND THE SOLDER LUG.
P532 TO KMA 24 8
- OR OOM MIC KEY
| TTT NAV/COM CIRCUIT BREAKER SWITCH
12 pp NAV | SOON 500.1. AUDIO OUT —————————>-1 2 | KN 53 NAV 500.0 OUT 135 5. IF AN INTERNAL SPEAKER IS NOT USED THEN
| to Ш ” CRI (007- 6021-00} ONE OF THE 3 SPEAKER LOADS SHOULD BE
Py — GROUND LUG AUDIO COMMON ————————1s| МАУ CONNECTED SETWEEN PINS U AND 22.
IF AN EXTERNAL SPEAKER IS NOT USED THEN
| PI7I p4oi THE SPEAKER LOAD SHOULD BE CONNECTED
,- = BETWEEN PINS X AND 22.
| 16 rem COM 2 SPEAKER LOAD 4 OHM SPEAKER OUT = 41 SPEAKER QUT ——e—— |9 IF NEITHER AN INTERNAL NOR EXTERNAL SPEAKER
м J Ca Lia IS USED THEN SHORT PIN X TO PIN U AND CONNECT
KY 195 THIS PAIR TO ONE END OF A SPEAKER LOAD AND
| P—— GROUND LUG INPUT OR _ KX 145 CONNECT THE OTHER END OF THIS LOAD TO PIN 22.
K 10 q COM 2 SOOnIN PREAMP OUT 500 a. OUTPUT pet 34 COM — 500.a. AUDIO OUT — — zz H| 12 WHEN ALL 3 SPEAKER LOADS ARE ALREADY IN USE.
+ AUDIO ICA —— —| MIC AUDIO =———————— 5 AN EXTERNAL 16 OHM 374 WATT. RESISTOR(KPN 132-
| M H A COM 2 MIC AUDIO XMIT MIC MIC AUDIO Е 39 ок Di SEE NOTE | 0107-33) SHOULD BE USED TO LOAD THE INT OR EXT.
A v A COM 2 MICKEY XMIT KEY MIC KEY ——— 40 — MIC KE Y —————'.W:wa 7 SPEAKER OUTPUTS AS REQUIRED.
NAV/COM
| P532 & PA MUTE (PIN i8) IS AN OUT PUT FROM THE KMA 24 THAT
2 NET IS PULLED LOW WHEN THE MICROPHONE IS KEYED WITH THE
2 4 5 AUDIO OUT —— > 2 KN 53 — MIC SELECT SWITCH IN THE INT POSITION. THIS LINE CAN
| 13 ni NAV 2 500. IN NAV AUDIO H 00 0. AUDIO HL BE USED TO MUTE PASSENGER ADDRESS AUDIO. WHEN NOT USED,
4 4-——— GROUND LUG NAV AUDIO AUDIO COMMON ко) 5 NAV PIN 18 SHOULD BE LEFT OPEN.
7 OPTIONAL | INTERCONNECT FOR BOOM MIC OR DUAL HEADSET
| OR P621 _ INSTALLA
8 If STANDARD . WIRE MICROPHONE PLUG IS USED. THE FRAME
6 == DOME SOOAIN DME AUDIO HI AUDIO HIGH mm B KN 62 OF THE MIC JACK(S) SHOULD BE ISOLATED FROM GROUND BY
| | | He: INSULATED WASHERS TO PREVENT INTRODUCING NOISE INTO
#5 GROUND LUG DME AUDIO LO AUDIO GROUND—H—— | A DME THE MIC AUDIO
9, FOR INTERCOM 4 OPERATION THE MIC SELECTOR SWITCH
| Р285! POI > PLACED IN INT" POSITION AND MIC AUDIO WILL BE
pels o r HEAR D OVER THE HEAOPHONE OUTPUT. IF JUST INTERCOM
| с WHITE LAMP WHITE MRKR LIGHT H WHITE MRKR LIGHT A COP JS DESIRED. | AN U, THE INTERNAL SPEAKER
RESISTOR, KPN 132-0107-33. IF INTE AND
5 BLUE LAMP BLUE MRKR LIGHT Jl kA 285 OR. BLUE MRKR LIGHT | KA 40 SPEAKE Re OPÉRATIONS ARE BOTH _DESIRED. A SWITCH FOR
- | AMB R LICH B TIONS IS REQU
| ose-1055-00 |“ AMBER LAMP AMBER MRKR LIGHT и ER MRKR LIGHT (SEE DETAIL 6). THREE ¡ohm 3 4 WATT RESISTORS ARE
on o AVAILABLE BETWEEN PINS 14 AND. М, 19 AND L
` LI TO BE USED FOR THIS PURPOSE IF THEY ARE ‘NOT ALREADY
| 066- 1055-01 18 PA MUTE SEE NOTE 6 Fez = я О USED.
|
¿ E] ; 10. IF ALL SPEAKERS IN INSTALLATION ARE 8 OHM F202 SHOULD
2 \ nn u — НН = | IN 8 OH ION. IF ANY SPEAKERS IN THE INSTALLATION
| $ A ADF 1500.0 IN 500.0. AUDIO (HI) ею KR 87 OR 300.4. AUDIO (HI)-————I0 KR 86 IS 4 OHM THEN F202 SHOULD BE LEFT IN 4 OHM POSITION,
« — GROUND LUG GROUND =H 500_n AUDIO (LO}——+—+—l | (REFER TO FIG.6-2 ON PAGE 6-17 OF THE MAINTENANCE
MANUAL FOR POSITIONING OF F202.)
| POSI
u ++—ADF 2 500. IN AUDIO QUT ————————— 15
| ri 151 |KR 85
$7 GROUND LUG AUDIO QUT 4 6
DETAIL. "В"
Р250! DETAL В
| (SEE NOTE 9)
| T ALTIMETER WARNING ———————e— AUDIO HI (500.1) 7 KI 250 KMA 24
P241 TERRES 16.0 3 4/4 WATT
_[—— AUDIO LOW ! REE
| P2951
-
2 A sm SENS _MRKR RCVR (MM) ———>— A
т || КС 295
9 — GROUND LUG MRKR RCYR (REF) -—= E INTERNAL SPEAKER
| В (== MARKER RECEIVER ANTENNA
А Y
| 21 SPARE '
| 7 E—1a 14/28 VDC AIRCRAFT POWER TO HEADPHONE AMPLIFIERRIBAWG \ Loo Leo NPUTS ARE TO BE SUPPLIED THROUGH sE e
' m PARATE CIRCUIT BREAKERS.
20 - 3A 14/28 VDC AIRCRAFT POWER TO SPEAKER AMPLIFIER 18 AWG | 59 Nor CONNECT TOGETHER.
| 3 © 3 HEADPHONES
see DETAIL Al Y ++ MIC AUDIO IN —————“+—v T М
' "o il
| у y MICKEY IN FOR 28V LIGHTING LEAVE PIN D OPEN.
F 28V INST LGT CONNECT PIN E TO INSTRUMENT LIGHT GROUND.
Р MMER VOLTAGE TO PINE
| о IV INST LGT FOR 14V LIGHTING CONNECT
E INSTLGT GND BOTH PINS E AND F TO INSTRUMENT LIGHT GROUND.
APPLY DIMMER VOLTAGE TO PIN D.
р. “``
| w 2 CABIN SPEAKER —
| SEE DETAIL B{ U = INTERNAL SPEAKER — >
oy “à
x € EXTERNAL SPEAKER =
22 J SEE NOTE 5 AND 10
| ! SEE NOTE 4. #18 AWG
L 2 = AIRFRAME GROUND ——————Æ
FIGURE 2-6 KMA 24 INTERCONNECT OO AND 01
> (Dwg. No. 155-1358-00, R-3)
(Sheet 1 of 2)
Rev. 1, January, 1982
1M0012-3 Page 2-15
KING
KMA 24
AUDIO PANEL /MARKER BEACON RECEIVER
P24)
r— = — TY] ФЕТА.
(SEE NOTES 788)
- (IF REQUIRED)
| 14 =—— HF SPEAKER LOAD SPEAKER OUT
н PO E" MC
Е a
| 17 TEL RINGER RINGER AUDIO HI 2| кт об RE E 4 y —" 0 3
m4 GROUND LUG AUDIO LO с 3 AUDIO =$
1
| J e ME/TEL 500.0 IN RCVR AUDIO HI L:14| KING 500 mn EZ
OR
K mp HF/TEL MIC AUDIO MIC AUDIO ————— 10] PHONE MIC +
SEE NOTE 2 | ЧИ Li © - к! (032-0008-00 14 у
| 5 1 HE/TEL MIC KEY MIC PTT 19 MIC KEY | \ - oi 28v 2
Г
1 |
19 —— COM | SPEAKER LOAD em || *—o—y some
и wim |
| | T „=. ' | 3,
L $ PISE! L SPEAKER OUT——C) ei 1
| $-—— GROUND LUG AUDIO LO es K Y ; Ca |
+ 4 a 7.
9 7 COM | 500... iN 500n OUTPUT —————— 8 196/197 COM 500 a, QUT ————tmt—] 34 KX 4.
| p f~— COMM | MIC AUDIO MIC AUDIO my € COM MIC AUDIO ————— 139
+
R = COM | MIC KEY MIC KEY — 4 | MIC кку— 41-140 170/175
P5332 oR TO KMA 24 BOOM MIC KEY
| Te) NAV/COM CIRCUIT BREAKER — SWITCH
| ar | аж
12 + NAV | 500. IN 500.0. AUDIO OUT 2] K № 55 NAV 500.0. OUT 135 CRI (007-602-00)
| rr GROUND LUG AUDIO COMMON ———— ——— =— $ NAV
5
| PI7I p401
„ “= y to!
16 — COM 2 SPEAKER LOAD 4 OHM SPKR SPEAKER QUT ———— 14 SPEAKER QUT ———— mts 19
| м a lx
| + GROUND LUG INPUT GROUND OR KY 195 _ y la
K 10 — COM 2 500.0 IN PRE AMP OUT 500 mn OUTPUT —————34 COM — 5005 AUDIO OUT TA iz! K 5
2 р — ————
| M H f+— COM 2 MIC AUDIO XMIT MIC MIC AUDIO —— ; 39 OR MIC AUDIO т 5 SEE NOTE!
A v > COM 2 MIC KEY XMIT KEY MIC KEY 40 — MIC KEY —————— 7
NAV/COM
| P532
|
| г 13 di NAV 2 SOON IN NAV AUDIO Hi 500.1. AUDIO OUT emf 21 KN 53 :
4 #4 GROUND LUG NAV AUDIO LO AUDIO COMMON ——— > $ NAV ;
| OR P621 |
| 6 #~y— DME 500.1 IN DME AUDIO HI AUDIO HIGH ————3— 6 KN 62 7
1 I
TY GROUND LUG DME AUDIO LO AUDIO GROUND ——————[ A DME а
| p2851 P401
| с WHITE LAMP WHITE MRKR LIGHT IH WHITE MRKR LIGHT ——— | A o.
5 BLUE LAMP BLUE MRKR LIGHT “| KA 285 OR BLUE MRKR LIGHT с А 40
| 066 - 1058-02 4 AMBER L AMP AMBER MRKR LIGHT PL AMBER MRKR LIGHT в| К
OR uma D
066 - 1053-03 18 PA MUTE ———————————— SEE NOTE 6 =
| Pare Pasi PIO!
* - -
i | — — —— —
| Ss ADFI SOOZ IN 500.1. AUDIO (HI) - 10 KR 87 OR AUDIO QUT A 5 KR 85 ов SOON AUDIO (HI ) т 10 KR 86
Ÿ 7 GROUND LUG GROUND Lt H AUDIO QUT ————— e] 6 ———— 800.4. AUDIO (LO) ——!I 10
| N NO CONNECTION
| P2501 LETAL E
(SEE NOTE 9)
| т ALTIMETER WARNING AUDIO HI (500) ———— 7 ‚
1 KI 250 KMA 24
[— AUDIO LOW! Rad! INTERCOM 16.41 3 1/4 WATT
| P295I =
2 ..
2 + MM SENS MRKR RCVR (MM) ———— A
‘ Li GROUND LUG MRKR RCVR (REF) toi] ; £ KC 295 | =
| - INTERNAL SPEAKER
| (>— MARKER RECEIVER ANTENNA OPERATION
8
A Y
| 2 SPARE
| 7 a= 14/28 VDC AIRCRAFT POWER TOHEAOPHONE AMPLIFIER ЮВ АМС | -uege POWER INPUTS ARE TO BE SUPPLIED THROUGH SEPARATE CIRCUIT BREAKERS,
20 3A 14/28 YDC AIRCRAFT POWER TO SPEAKER AMPLIFIER М 18 AWG DO NOT CONNECT TOGETHER.
| 3 € 7 НЕАОРНОМЕ $ ——o
de ————————,
SEE DETAIL Al $ MIC AUDIO IN fi
| Y MIC KEY IN
Е 28V INST LGTY FOR 28V LIGHTING LEAVE PIN D OPEN
CONNECT PINE TO INSTRUMENT LIGHT GROUND.
D lav INST LCT APPLY DIMMER VOLTAGE TO PINF
| E INSTLGT GND FOR 14V LIGHTING CONNECT "BOTH PINS E AND F TO
INSTRUMENT LIGHT GROUND. APPLY DIMMER VOLTAGE TO PIN D.
в ">,
| w À; CABIN SPEAKER ——
| SEE DETAIL B | U = INTERNAL SPEAKER —
x — EXTERNAL SPEAKER =
+22 --—9 03 SEE NOTE 5 AND 10 `
| ! SEE NOTE 4 418 AWG
Lo — dz] — AIRÉRAME GROUND —————E
Rev. 1, January, 1982
1M0012-3
FIGURE 2-6 KMA 24 INTERCONNECT 02 AND 03
(Dwg. No. 155-1358-00, R-3)
(Sheet 2 of 2)
Page 2-17
NOTES
THE KX 145300 OHM OUTPUT 19 PIN 12 BUT IF
TRANSMIT SIDETONE IS DESIRED, PINS [2 & 13
OF THE KX 145 MUST BE SHORTED TOGETHER
AND PIN 18 (S00.n HEADPHONE) USED AS THE
500.0. AUDIO INPUT TO THE KMA 24.
PINS J,K, AND I5 ARE USED FOR НЕ RECIEVER
CONNECTIONS ON THE -O2 FLAVOR AND FOR
RADIO TELEPHONE CONNECTIONS ON THE -O3FL AVOR.
ALL SHIELDS SHOULD BE GROUNDED ON ONE
END ONLY. THE END THAT IS GROUNDED SHOULD
ALWAYS BE THE LOAD END AS SHOWN.
SPEAKER AND HEADPHONE GROUND RETURNS
MUST BE KEPT SEPARATE FROM OTHER GROUNDS.
THEY SHOULD BE CONNECTED TO PIN 22.
PIN 2 MUST BE CONNECTED TO AIRFRAME
GROUND WITH A SHORT, HEAVY (#18 AWG) WIRE.
ALL OTHER GROUNDS SHOULD BE CONNECTED
TO PIN | AND THE SOLDER LUG.
IF AN INTERNAL SPEAKER IS NOT USED THEN
ONE OF THE 3 SPEAKER (.0ADS SHOULD BE
CONNECTED BETWEEN PINS UAND 22.
IF AN EXTERNAL SPEAKER IS NOT USED THEN
THE SPEAKER LOAD SHOULD BE CONNECTED
BETWEEN PINS X AND 22.
IF NEITHER AN INTERNAL NOR EXTERNAL SPEAKER
IS USED THEN SHORT PIN X TO PIN U AND CONNECT
THIS PAIR TO ONE END OF A SPEAKER LOAD AND
CONNECT THE OTHER END OF THIS LOAD TO PIN 22.
WHEN ALL 3 SPEAKER LOADS ARE ALREADY IN USE.
AN EXTERNAL 16 OHM 34 WATT. RESISTOR (KPN 132-
0107-33) SHOULD BE USED TO LOAD THE INT OR EXT.
SPEAKER OUTPUTS AS REQUIRED.
PA MUTE (PIN 18) 1S AN OUTPUT FROM THE KMA 24
THAT IS PULLED LOW WHEN THE MICROPHONE iS KEYED
WITH THE MIC SELECT SWITCH IN THE INT POSITION.
THIS LINE CAN BE USED TO MUTE PASSENGER ADDRESS
AUDIO. WHEN NOT USED, PIN 18 SHOULD BE LEFT OPEN.
OPTIONAL INTERCONNECT FOR BOOM MIC OR DUAL HEADSET
INSTALLATION,
IF STANDARD 3-WIRE MICROPHONE PLUG IS USED, THE FRAME
OF THE MIC JACK(S) SHOULD BE ISOLATED FROM GROUND BY
INSULATED WASHERS TO PREVENT INTRODUCING NOISE INTO
THE MIC AUDIO
FOR INTERCOM OPERATION THE oe SELECTOR SWITCH
1S PLACED IN THE "INT" POSITION AND MIC each WILL BE
HEARD OVER THE HEADPHONE OUTPUT IF JUST INTERCOM
OPERATION IS DE on U, THE INTERNAL st
QUTPUT, MUST B NATED INTO A ohm 3 Ya WATT
RESISTOR, KPN 152. oar 33. iF INTERCOM AND INTERNAL
SPEAKER OPERATIONS ARE POTH DESIRED, A SWITCH FOR
SELECT ino BETWEEN THE 2 OPERATIONS IS REQUIRED
(SEE DETAIL В). THREE I6ohm 3 ya WATT RESISTORS ARE
AVAILABLE BETWEEN PINS 14 AND N, 19 AND L
TO BE USED FOR THIS PURPOSE IF THEY ARE ‘wor "ALREADY
IF ALL SPEAKERS IN INSTALLATION ARE 80HM F202 SHOULD
BE IN BOHM POSITION. IF ANY SPEAKER IN INSTALLATION. IS 4 OHM
THEN F202 SHOULD BE LEFT IN 4 OHM POSITION. (REFER TO
FIG. 6-2 ON PAGE 6-17 OF THE MAINTENANCE MANUAL FOR
POSITIONING OF F202) *
KMA 20
IM0012-3
0 00 Y Os VI FF UN ГО —>
dt — ao — o ad
CU EUN-0
AIRFRAME G
28V LIGHT
14V LIGHT
14/28V AIR
UNSWITCHED
COM 1 SPKR
COM 2 SPKR
AUX SPKR L
EXTERNAL S
CABIN SPEA
MIC AUDIO
HF/ TEL MIC
HF/TEL 500
COM 1 500
COM 2 500
NAV 1 500
MARKER ANT
MARKER ANT
WHITE LAMP
BLUE LAMP
AMBER LAMP
P.A. SPEAK
MIC KEY IN
HF/TEL MIC
COM 1 MIC
COM 2 MIC
COM 1 MIC
COM 2 MIC
NAV 2 500
ADF/ADF 1
DME/ADF 2
HEADPHONES
SPEAKER GR
GROUND
LIGHT DIMM
14/28V AIR
TEL RINGER
ALTIMETER
CCM 1 SPEA
COM 2 SPEA
AUX SPEAKE
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
ROUND
DIMMER
CRAFT POWER
200 OHM INPUT
Z
F
DIMMER D
2
LOAD 19
LOAD 16
OAD 14
PEAKER
KER
IN
AUDIO
OHM INPUT
OHM INPUT
OHM INPUT
OHM INPUT
ENNA (CENTER)
ENNA (SHIELD)
ER
KEY
KEY
KEY
AUDIO
AUDIO
OHM INPUT
500 OHM INPUT
500 OHM INPUT
NTO D3 ~<C PVD YC Жо 00 Е ><
mo
WN
KMA 24
OUND
ER GROUND
CRAFT POWER TO HEADPHONE AMP
WARNING |
KER LOAD RETURN
KER LOAD RETURN
R LOAD RETURN
DME 500 OHM INPUT
ADF 2 500
MIDDLE MAR
P.A. MUTE
SPARE
OHM INPUT
KER SENSE
N
~
го — ОО # = гто— — = пп о —х ГО
—
Ng =a
— 00
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
SEE
FIGURE 2-7 KMA 20 REPLACEMENT PIN FUNCTIONS
(Sheet 1 of 2)
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
СК Кл кл Кл Fs CA РО Ny >
y
NOTE 7
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
NOTE
UT Un
Page 2-19
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
NOTES
1. The KMA 24 has 3 separate ground pins. Pin Z is the airframe or power ground. Pin 22 should be used
to ground all speaker and headphone ground returns and pin 1 should be used for all other grounds.
2. LIGHT DIMMER GROUND is a separate ground on the KMA 24 (Pin E).
3. HEADPHONE AMPLIFIER POWER is supplied by a separate pin on the KMA 24 (Pin 7).
4. The KMA 24 has 2 unswitched audio inputs: Pin 17 which is meant to be used for TELEPHONE RINGER and
pin T which is meant to be used for ALTIMETER WARNING. The pin T input is not muted when the
microphone is keyed.
5. Each speaker load is isolated from the KMA 24 ground. See the load return pin numbers above.
6. If either the INT (passenger address) or EXT (ramp hail) speakers is not used on the KMA 24, their
outputs should be loaded with a 16 ohms, 3-1/4 watt load resistor.
7. KMA 24 pins K,J, and 15 are used for HF on the -00 and -02 versions and for TEL on the -01 and -03
versions. | |
8. A MIDDLE MARKER SENSE (Pin 2) is provided on the KMA 24 for connection to flight control systems.
This line goes high when the middle marker is detected but not when lamp test is activated.
9. The DME 500 OHM INPUT is always pin 6 on the KMA 24. An ADF 2 input is provided on versions -00 and
-01 as pin 11. However, pin 11 must be left open on versions -02 and -03 since this input is used
for the AUTO function on these versions.
FIGURE 2-7 KMA 20 REPLACEMENT PIN FUNCTIONS
(Sheet 2 of 2)
1M0012-3 | Page 2-20.
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
SECTION lil
OPERATION
3.1 KMA 24 OPERATION
3.1.1 MARKER BEACON RECEIVER
Marker beacon receivers are used to provide accurate fixes by informing the pilot of his passage over
beacon stations located on airways and ILS approach courses. Three types of beacons are used; the inner
marker, the outer marker and the middle marker. The marker beacons used to mark airways are the same as
inner markers as far as the receiver is concerned.
The outer marker is normally positioned on the front Localizer course near the point where the glideslope
approach path intersects the minimum inbound altitude. Distance from the airport will vary from 3.5 to 6 -
miles. The outer marker signal is modulated at 400Hz and is keyed at the rate of two dashes per second.
When passing over the outer marker, the blue Light (Labeled "0") will flash on/off at the rate of two per
second and if the marker audio is selected by the pilot he will hear a series of Low tone dashes.
The middle marker will normally be positioned about 3500 feet from the ILS runway threshold and indicates
the point on the ILS glidepath that is 200 feet above the runway threshold. The middle marker signal is
modulated with 1300Hz and this modulation is keyed with alternate dots and dashes. These dots and dashes
will be heard in a medium pitched tone during passage over the middle marker and the amber Light (labeled
"M") will flash synchronously with the tones.
When the inner marker is used it will be located close to the ILS runway threshold and it will indicate
an altitude of 100 feet above the threshold when following the ILS glidepath. The inner marker
modulation is 3000Hz and is keyed six times per second. Passage over this marker will produce high pitch
(3000Hz) dots and synchronous flashes from the white Light (labeled "A"). |
Airway, or enroute, marker beacons are also modulated with 3000Hz. Passage over these beacons will cause
a 3000Hz tone to be heard and the white Light to flash.
The three marker Lights can be tested by depressing the top horizontal pushbutton labeled "TST". This
test can be performed at any time on the KMA 24 without disturbing a coupled autopilot.
The sensitivity of the marker beacon receiver can be selected with the bottom horizontal pushbutton
Labeled "SENS". With HI sensitivity selected (SENS pushbutton depressed) the receiver will detect a
weaker signal than it will with LO selected. It is suggested that the HI sensitivity be selected until
the outer marker aural indication is received. This should be about one mile before the outer marker.
Then LO sensitivity may be selected to reduce the duration of the indication thereby obtaining a more
accurate ‘indication of station passage. The audio tones will be heard before and after the visual
indication is given since a stronger signal is required for Lamp illumination than for aural tone.
3.1.2 ISOLATION AMPLIFIERS
The top row of vertical pushbuttons on the KMA 24 are used to select the desired audio to be heard on the
cabin speaker. The bottom row of vertical pushbuttons Likewise select the audio to be heard on the
headphones. The selections are completely independent of each other allowing the same audio input to be
selected for both speaker and headphones if desired.
The "AUTO" pushbuttons (not on some versions) when selected will cause the audio from the transceiver
selected with the mic switch to be heard. Two AUTO pushbuttons are provided. One for the speaker and
one for the headphones. \
The microphone selector switch performs several functions. It routes microphone .audio and keying to the
appropriate transceiver or to the speaker amplifier in the KMA 24. It switches the speaker amplifier
output to the appropriate speaker. On units with "AUTO" this function is performed by the microphone
selector switch. Also, it turns the speaker amplifier power on and off.
When the mic selector switch is in the "OFF" position, power is not supplied to the speaker amplifier or
to the marker receiver. However, the headphone amplifier will still be active.
Rev. 1, January, 1982
1M0012-4 | Page 3-1
KING
KMA 24
AUDIO PANEL/MARKER BEACON RECEIVER
The "INT" position of the mic selector switch will provide either an internal speaker other than the
cabin speaker (passenger address) or intercom. If an internal speaker is used it should be remotely
located to prevent feedback between this speaker and the microphone. A "PA mute" is provided which can
be used to mute the normal passenger address audio while the microphone is keyed in the "INT" position.
IMOO1 2-4 Page 3-2
">