BENDIXKing Skymap IIIC User manual

KMA 24 and KMA 24H
Bendix/King
Audio Control Systems
KMA 24 and KMA 24H Bendix/King Audio Control Systems
Honeywell
23500 W. 105th Street, Olathe, KS 66061-1950
Telephone [phone] Fax [phone]
Toll-Free in U.S. 877.712.2386
www.bendixking.com
Honeywell 23500 W. 105th Street, Olathe, KS 66061-1950 Telephone [phone] Fax [phone] Toll-Free in U.S. 877.712.2386 www.bendixking.com
© 2000 Honeywell
2/00 006-08316-0008 5K Printed in U.S.A.
Policy Notice: In keeping with Honeywell’s goal of constant
product improvement, product specifications and design
features may be altered without notice.
Avionics installation requires special skills, tools and equipment.
Our limited warranty is valid only for equipment installed in
accordance with our sales policy.
Optional Intercom Modes
The optional installation of a remote,
three-position switch for intercom operations with the KMA 24H provides three modes: Isolate, Normal (NORM) and Private. In Isolate, the pilot takes himself out of the intercom loop while the other four intercom positions remain active. In Normal, all five intercom positions are tied together. In Private, the pilot and copilot positions are linked together for two-station hot mike operation. At the same time, the other three intercom positions have independent three-station intercom operation. Receiver Selection
The top row of push buttons on the
console controls the audio selection for the speaker, and the bottom row selects audio for headphones. The selections are independent, and any audio input can be selected for speaker or headphones or both. These push buttons allow audio selection independent of the AUTO feature described earlier.
The KMA 24 and KMA 24H can control
as many as six receivers. Both units also have two unswitched inputs for uses such as the radar altimeter audio alert or the ring signal from a radiotelephone.
To listen to a specific receiver, simply
press the corresponding headphone or speaker
button “in.” To disconnect that receiver, press the button again. It will return to the “out” position.
For both the KMA 24 and KMA 24H,
volume of audio input from transceivers and receivers is set with the volume controls of each individual radio. Transmitter Selection
The rotary switch on the right side of
the KMA 24 and KMA 24H consoles selects the desired transmitter for the cockpit micro- phones. In the KMA 24, the off position shuts off power to the speaker amplifier and marker beacon receiver. (The headphone amplifier operates whenever the aircraft electric power is on.)
With the KMA 24, the next position
of the rotary switch may be either “TEL” (radiotelephone) or “HF” (high frequency transceiver.) The former is more likely to be found in aircraft used mostly for domestic operations, the latter for international operations.
The COMM 1 and 2 positions (COMM
1-4 or 1-5 for KMA 24H) are for transmitting on the frequencies set up on those respective communication transceivers.
The “INT”, “PA” and “EXT”, and “EMG”
positions are discussed above.
Other Combinations Of Features KMA 24 KMA24H KMA 24 with TEL and ADF 1 and 2 KMA 24H with 4 COMMs and 2 ADFs KMA 24 with HF and AUTO KMA 24H with 5 COMMs and 1 ADF KMA 24 with HF and ADF 1 and 2
Specifications
TSO Compliance:
Marker Beacon Receiver: TSO C35d,
Class A
KMA24—Env. Cat. A1D1/A/PKS/
XXXXXXZBAAA
Audio Amplifier: TSO C50b
KMA 24H—Env. Cat. A2D1/A/KPS/
XXXXXXB/AB/BZ/A
Weight: 1.7 lb. (0.77kg)
Physical Dimensions:
Length behind panel: 6.8 in. (17.30 cm)
Width: 6.25 in. (15.88 cm)
Height: 1.3 in. (3.30 cm)
Duty Cycle: Continuous
Power Requirements (not including
instruments lights):
KMA 24 13.75v 27.5v
Idle current, mike
switch on 110 ma 170 ma
Idle current, mike Less than Less than
switch off 8 ma 16 ma
Max. operating
current 1.9 a 1.9 a
KMA 24H
Idle current 350 ma 500 ma
Max. operating
current 1.8 a 1.8 a
Temperature Range: -20ºC to +55º with
brief operation at +70ºC (KMA 24),
-20ºC to +70ºC continuous (KMA 24H)
Marker Beacon Receiver
(KMA 24 only)
Frequency: Crystal-controlled at 75 MHz
Sensitivity: LO 1,000µv Hard
HI 200µv Hard
Selectivity: 6 db at ± 10 kHz Min.
40 db at ± 200 kHz Max.
Input Impedance: 50 ohms
Output: Capable of 4 mw into isolation
amplifier impedance of 500 ohms.
Isolation Amplifiers:
KMA 24 Inputs: KMA 24 models without
AUTO accommodate three transceivers
and six external receivers. Models with the
AUTO function accommodate three trans-
ceivers and five external receivers. All
models also have two unswitched inputs.
(Typical use: radar altimeter aural warning
and radiotelephone ringer.)
KMA 24H Inputs: KMA 24H models
accommodate five transceivers and five
external receivers or four transceivers and
six receivers. All models also have two
unswitched inputs. (Typical use: radar
altimeter aural warning and radiotele-
phone ringer.)
KMA 24 Input Impedance: 500 ohms
KMA 24H Input Impedance: 320 ohms
for all ICS inputs, 500 ohms for all
audio inputs
Input Isolation:
KMA 24: 40 db between inputs
KMA 24H: 60 db between inputs
Input Muting (when mike is keyed):
At least 55 db
Speaker Output:
With 13.75v Supply:
Into 4 ohm load: 7 w (KMA 24)
6 w (KMA 24H)
Into 8 ohm load: 4 w
Into 8 ohm load from
8 ohm tap: 6 w (KMA 24H)
With 27.5v Supply:
Into 4 ohm load: 12 w (KMA 24)
10 w (KMA 24H)
Into 8 ohm load: 6.5 w
Into 8 ohm load
from 8 ohm tap: 10 w (KMA 24H)
Headphone Output:
KMA 24: 50 mw into 500 ohm load
KMA 24H:
With 27.5v supply: 120 mw into each
500 ohm load
With 13.75v supply: 20 mw into each
500 ohm load
Output Characteristics:
Distortion: Less than 5 percent at rated
output
Frequency response:
KMA 24: Within 6 db from 350 hz to
6,000 hz
KMA 24H: Within 3 db from 350 hz to
6,000 hz

Intercom Volume Control
KMA 24 Audio Control System
Compact TSO’d consoles
make audio control
“push button simple”
KMA 24H Audio Control System
Marker
Beacon
Lights
Photocell
For Automatic
Marker Lamp
Dimming
Marker Beacon
Sensitivity
Select Button Headphone Audio Select Buttons
Microphone
Selector Switch
HF Position
(Replaced With TEL
Position When
HF Transceiver
Not Installed)
Second Pair
of ADF Buttons
(AUTO Buttons
May Be Substituted)
Speaker
AUTO
Switch
5 COMMs and One ADF
Speaker Audio Select Buttons
HF Select Buttons
(TEL Buttons
May Be Substituted)
Intercom
Volume
Control
Intercom VOX
Sensitivity
Control
Headphone Audio Select Buttons Microphone
Selector Switch
(including emergency
and PA positions)
Microphone Selector Switch
(including emergency,
PA, and EXT ramp hailer positions)
4 COMMs And Two ADFs
AUTO Select
Buttons
Speaker Audio Select Buttons
Marker Beacon
Lamp Test Button
Push button simplicity puts complete,
flexible audio control right at your fingertips
with Bendix/King’s easy-to-use KMA 24
and KMA 24H systems.
Each is self-contained, all solid-state
and stands only 1.3 inches high in your Silver
Crown stack. The “slant top” package tailors
it for the top slot in your instrument panel.
The KMA 24 controls as many as three
transceivers and six receivers, including
the internal marker beacon receiver and its
automatically dimmed 3-light presentation.
The KMA 24H controls up to five transceivers
and five receivers, or four transceivers
and six receivers.
The KMA 24H replaces the internal marker
beacon receiver with an intercom, which provides
unprecedented flexibility. The intercom features
capability for hot mike, voice activation (VOX),
or keyed activation of up to five intercom stations.
In hot mike operation all intercom microphones
remain active at all times whether the operator
is talking on intercom or not. Voice activated
operation has the microphone active only when
the operator begins to talk. In keyed operation,
the operator may depress a separate intercom
switch to activate the microphone for
intercom usage.
When two KMA 24H’s are installed, dual
transmit flexibility is provided–allowing the pilot
and copilot or another crew member to talk
on different transmitters simultaneously while
providing pilot priority if the same transmitter
is keyed by both crew members at the same time.
The KMA 24H also includes voice recorder
compatibility and an emergency mode, which
connects the pilot’s headphones and microphone
directly to COMM 1 in the event of a KMA 24H
failure or a power interruption to the KMA 24H.
The KMA 24 and KMA 24H provide
transceiver and receiver outputs to speaker
or headphones or both. A separate isolation
amplifier for headphones maintains constant,
noise-free volume levels, even when several
receivers are monitored at once. Keying
a mike mutes all receivers automatically
to eliminate feedback.
The KMA 24 is offered in four configurations
and the KMA 24H in two configurations,
so you can choose the one that best matches
your requirements.
You’ll find more detailed information,
specifications, and a convenient tear-off
Pilot’s Guide for both units on the following pages.
Audio Control With
The KMA 24
Two rows of alternate-action push buttons
on the KMA 24 console control all receiver audio
distribution functions.
The top row of push buttons selects receivers
for the cockpit speaker, the bottom row for head-
phones. Both rows are completely independent
of each other, allowing selection of speaker
or headphones, or both, for all combinations
of receivers.
The rotary selector switch on the right side
of the console connects the microphone to either
COMM 1 or COMM 2. An additional switch
position allows selection of radiotelephone on
some KMA 24 models, or of HF on other models
of the KMA 24. Other switch positions are for
cabin address and ramp hailer.
Turning the microphone selector switch
to OFF cuts power to the speaker amplifier
and the marker beacon receiver. The headphone
amplifier remains in operation.
The AUTO feature, when engaged,
automatically matches the corresponding receiver
audio with the selected transmitter, such as
COMM 1, COMM 2, TEL or HF transmitter.
An option allows the AUTO feature to be replaced
by a second ADF receiver position.
The unit operates on either 13.75 volts
or 27.5 volts without the use of adapters
or converters.
Built-In Marker Beacon
The KMA 24 has a built-in, crystal
controlled, superheterodyne marker beacon
receiver with a three-light display. Its excellent
selectivity eliminates interference from FM radio
and TV stations. Dimming circuitry automatically
adjusts the brightness of the lamps to a level
appropriate for ambient cockpit light.
The lower push button next to the marker
lamps selects high and low sensitivity; the upper
push button tests the lights.
The unit can also drive remote marker beacon
lights, such as those in Bendix/King Autopilot
Annunciator Panels or the KA 40 Remote Marker
Light display.
Five-Station Voice
Activated Intercom
In the KMA 24H, a five-station intercom
replaces the KMA 24’s integral marker beacon
receiver and lights. The intercom includes three
modes of operation: hot mike, voice activated
(VOX) or keyed activation for up to five
intercom stations.
In single KMA 24H installations, the pilot’s
microphone has priority over the crew member’s
microphone in the vent both are trying to transmit
at the same time.
In a dual KMA 24H installation the pilot
and a crew member can talk on different
transmitters at the same time; however, the pilot
will automatically have priority if he keys
the mike while another crew member is using
the same transmitter.
An emergency position (EMG) on the
microphone selection switch connects the pilot’s
mike and headphones directly to COMM 1
as a means of fail-safe communication in the
event of a failure within the KMA 24H.
Since the KMA 24H has an integral intercom,
a “PA” position replaces the “INT” position on
the microphone selection switch. In aircraft
equipped with a cabin speaker, this position allows
the pilot or copilot to make announcements
to the passengers.
KR 21 Marker Beacon Receiver
The cockpit can easily have marker beacon
reception and display as well as the convenience
of the KMA 24H’s built-in five-station intercom.
The TSO’d Bendix/King KR 21 Marker Receiver
provides marker beacon audio signals to the
KMA 24H and has a marker light display similar
to that in the KMA 24.
The KR 21 is self-contained and can
be mounted anywhere in the panel, either
horizontally or vertically. It is all solid-state
and has its own self-test and automatic dimming.
“Auto” Receiver Audio Select
For KMA 24 models equipped with
the “AUTO” receiver Audio select feature, the transmitter selected with the microphone selector switch will be matched automatically with the appropriate COMM receiver audio on either headphone or speaker, or both, by simply pressing the desired headphone and/or speaker “AUTO” push button. (COMM 1 and COMM 2 push buttons should be disengaged unless it is desired to additionally listen to a COMM receiver other than the one selected with the microphone selector switch.)
Thus, on “AUTO” you may change the
rotary microphone switch back and forth, as needed, without having to reselect the corre- sponding COMM, TEL, or HF receiver buttons in order to hear the receiver.
Both models of the KMA 24H have
“AUTO COMM” capability and always provide automatic headphone audio selection to match the transceiver in use. The selection of speaker audio can either be made automatically by pulling out the speaker “AUTO” switch or manually with the row of speaker audio select push buttons. Marker Beacon Receiver (KMA 24)
The complete TSO’d 3-light marker beacon
receiver built into the KMA 24 gives you an accurate visual and aural signal when you pass over a 75 MHz beacon. The blue, amber, and white lights on the faceplate—as well as the
audio tone—identify the beacon type (outer, middle or airway/inner marker).
Either the speaker or headphone MKR
buttons or both must be “in” for the marker beacon receiver to provide an audio signal at beacon passage.
The horizontal push button labeled SENS
on the lower left side of the console gives you the choice of two receiver sensitivities. When the button is “in,” the sensitivity is on HI. During an approach, this setting should permit you to hear the outer marker tone about one mile out. At this point you may select LO to dampen the tone. It will start to sound again when you are closer to the marker, giving you a more precise indication of its location.
Pressing the top horizontal button marked
“TST” simply applies voltage to all three lamps to show that they are functioning.
Note: The TST button should not be pressed
to test the lamps when autopilot coupled on an ILS approach inside the outer marker. This is due to the fact that some autopilots (including Bendix/King autopilots) use the marker annunci- ation to change the sensitivity of the autopilot.
A photocell in the console automatically
dims the lamps for night operation.
The “INT” position on the KMA 24 and
the “PA” position on the KMA 24H permit the flight crew to address cabin occupants over the cabin speaker. To do this, select “INT” or “PA” with the microphone switch. When the mike is keyed, the receiver audio is muted and you may talk normally into the microphone to broadcast over the speaker.
The KMA 24H also has an “EMG” position
on the microphone selector. This feature by- passes the KMA 24H’s audio amplifier and directly connects COMM 1 to the pilot’s microphone and headphones. This provides a fail-safe method of communication should the unit fail.
The KMA 24 and KMA 24H also have
an “EXT” position on the microphone selector switch which connects the microphone to an external ramp hailer speaker, if installed.
KMA 24H Intercom
The KMA 24H has a built-in five-station
intercom with two dedicated amplifiers. Intercom operation may be “hot mike,” in which the intercom is active all the time; voice activated (VOX), in which the intercom becomes active automatically when a crew member begins to speak; or keyed activation, in which a separate microphone switch must be keyed to activate the intercom. Selection of the desired method of microphone activation is accomplished with the intercom VOX sensitivity control (outer concentric knob on left side of unit).
Turn it to the fully clockwise detent position
for hot mike operation. Turn the knob all the way counterclockwise past the detent for
keyed microphone operation. (Note: a separate intercom key switch must be included in the installation in order to use keyed intercom operation.) In the middle range, the switch selects VOX, and the rotation of this knob also adjusts the sensitivity of the voice activated switch.
In order to set the proper VOX sensitivity,
first turn the VOX sensitivity control clockwise until a hissing sound is heard in the headphones. Next turn the control counterclockwise until the hissing sound stops. The VOX is now properly set for the present noise environment. It is normal to have to reset the VOX sensitivity level whenever the noise in the cockpit/cabin changes, such as when making large power setting changes.
The inner concentric knob is the intercom
volume control this adjusts the intercom volume without affecting the volume of the selected receiver audio inputs.
When either the pilot or copilot keys
the microphone to transmit, all other intercom microphone inputs are muted, which ensures that the keyed microphone is the single source of transmitted audio. All receiver inputs are also muted during transmissions.
Marker Beacon Lights
Photocell For Automatic Dimming
Marker Beacon Sensitivity Select Button
Headphone Audio Select Buttons Microphone
Selector Switch
Speaker Audio Select Buttons
Marker Beacon Lamp Test Button
KMA 24 With “Auto” Feature And Radiotelephone KMA 24 H With Second ADF and Ramp Halker
Speaker Audio Select Buttons
Speaker AUTO Switch
Microphone Selector Switch (including emergency, PA, and ET ramp hailer positions)
AUTO Select Buttons
Intercom VOX Sensitivity Control
Headphone Auto Select Buttons
Operating the KMA 24/24H Audio Control Systems
Tear off this section for a convenient pilot’s operating manual.

Intercom Volume Control
KMA 24 Audio Control System
Compact TSO’d consoles
make audio control
“push button simple”
KMA 24H Audio Control System
Marker
Beacon
Lights
Photocell
For Automatic
Marker Lamp
Dimming
Marker Beacon
Sensitivity
Select Button Headphone Audio Select Buttons
Microphone
Selector Switch
HF Position
(Replaced With TEL
Position When
HF Transceiver
Not Installed)
Second Pair
of ADF Buttons
(AUTO Buttons
May Be Substituted)
Speaker
AUTO
Switch
5 COMMs and One ADF
Speaker Audio Select Buttons
HF Select Buttons
(TEL Buttons
May Be Substituted)
Intercom
Volume
Control
Intercom VOX
Sensitivity
Control
Headphone Audio Select Buttons Microphone
Selector Switch
(including emergency
and PA positions)
Microphone Selector Switch
(including emergency,
PA, and EXT ramp hailer positions)
4 COMMs And Two ADFs
AUTO Select
Buttons
Speaker Audio Select Buttons
Marker Beacon
Lamp Test Button
Push button simplicity puts complete,
flexible audio control right at your fingertips
with Bendix/King’s easy-to-use KMA 24
and KMA 24H systems.
Each is self-contained, all solid-state
and stands only 1.3 inches high in your Silver
Crown stack. The “slant top” package tailors
it for the top slot in your instrument panel.
The KMA 24 controls as many as three
transceivers and six receivers, including
the internal marker beacon receiver and its
automatically dimmed 3-light presentation.
The KMA 24H controls up to five transceivers
and five receivers, or four transceivers
and six receivers.
The KMA 24H replaces the internal marker
beacon receiver with an intercom, which provides
unprecedented flexibility. The intercom features
capability for hot mike, voice activation (VOX),
or keyed activation of up to five intercom stations.
In hot mike operation all intercom microphones
remain active at all times whether the operator
is talking on intercom or not. Voice activated
operation has the microphone active only when
the operator begins to talk. In keyed operation,
the operator may depress a separate intercom
switch to activate the microphone for
intercom usage.
When two KMA 24H’s are installed, dual
transmit flexibility is provided–allowing the pilot
and copilot or another crew member to talk
on different transmitters simultaneously while
providing pilot priority if the same transmitter
is keyed by both crew members at the same time.
The KMA 24H also includes voice recorder
compatibility and an emergency mode, which
connects the pilot’s headphones and microphone
directly to COMM 1 in the event of a KMA 24H
failure or a power interruption to the KMA 24H.
The KMA 24 and KMA 24H provide
transceiver and receiver outputs to speaker
or headphones or both. A separate isolation
amplifier for headphones maintains constant,
noise-free volume levels, even when several
receivers are monitored at once. Keying
a mike mutes all receivers automatically
to eliminate feedback.
The KMA 24 is offered in four configurations
and the KMA 24H in two configurations,
so you can choose the one that best matches
your requirements.
You’ll find more detailed information,
specifications, and a convenient tear-off
Pilot’s Guide for both units on the following pages.
Audio Control With
The KMA 24
Two rows of alternate-action push buttons
on the KMA 24 console control all receiver audio
distribution functions.
The top row of push buttons selects receivers
for the cockpit speaker, the bottom row for head-
phones. Both rows are completely independent
of each other, allowing selection of speaker
or headphones, or both, for all combinations
of receivers.
The rotary selector switch on the right side
of the console connects the microphone to either
COMM 1 or COMM 2. An additional switch
position allows selection of radiotelephone on
some KMA 24 models, or of HF on other models
of the KMA 24. Other switch positions are for
cabin address and ramp hailer.
Turning the microphone selector switch
to OFF cuts power to the speaker amplifier
and the marker beacon receiver. The headphone
amplifier remains in operation.
The AUTO feature, when engaged,
automatically matches the corresponding receiver
audio with the selected transmitter, such as
COMM 1, COMM 2, TEL or HF transmitter.
An option allows the AUTO feature to be replaced
by a second ADF receiver position.
The unit operates on either 13.75 volts
or 27.5 volts without the use of adapters
or converters.
Built-In Marker Beacon
The KMA 24 has a built-in, crystal
controlled, superheterodyne marker beacon
receiver with a three-light display. Its excellent
selectivity eliminates interference from FM radio
and TV stations. Dimming circuitry automatically
adjusts the brightness of the lamps to a level
appropriate for ambient cockpit light.
The lower push button next to the marker
lamps selects high and low sensitivity; the upper
push button tests the lights.
The unit can also drive remote marker beacon
lights, such as those in Bendix/King Autopilot
Annunciator Panels or the KA 40 Remote Marker
Light display.
Five-Station Voice
Activated Intercom
In the KMA 24H, a five-station intercom
replaces the KMA 24’s integral marker beacon
receiver and lights. The intercom includes three
modes of operation: hot mike, voice activated
(VOX) or keyed activation for up to five
intercom stations.
In single KMA 24H installations, the pilot’s
microphone has priority over the crew member’s
microphone in the vent both are trying to transmit
at the same time.
In a dual KMA 24H installation the pilot
and a crew member can talk on different
transmitters at the same time; however, the pilot
will automatically have priority if he keys
the mike while another crew member is using
the same transmitter.
An emergency position (EMG) on the
microphone selection switch connects the pilot’s
mike and headphones directly to COMM 1
as a means of fail-safe communication in the
event of a failure within the KMA 24H.
Since the KMA 24H has an integral intercom,
a “PA” position replaces the “INT” position on
the microphone selection switch. In aircraft
equipped with a cabin speaker, this position allows
the pilot or copilot to make announcements
to the passengers.
KR 21 Marker Beacon Receiver
The cockpit can easily have marker beacon
reception and display as well as the convenience
of the KMA 24H’s built-in five-station intercom.
The TSO’d Bendix/King KR 21 Marker Receiver
provides marker beacon audio signals to the
KMA 24H and has a marker light display similar
to that in the KMA 24.
The KR 21 is self-contained and can
be mounted anywhere in the panel, either
horizontally or vertically. It is all solid-state
and has its own self-test and automatic dimming.
“Auto” Receiver Audio Select
For KMA 24 models equipped with
the “AUTO” receiver Audio select feature, the transmitter selected with the microphone selector switch will be matched automatically with the appropriate COMM receiver audio on either headphone or speaker, or both, by simply pressing the desired headphone and/or speaker “AUTO” push button. (COMM 1 and COMM 2 push buttons should be disengaged unless it is desired to additionally listen to a COMM receiver other than the one selected with the microphone selector switch.)
Thus, on “AUTO” you may change the
rotary microphone switch back and forth, as needed, without having to reselect the corre- sponding COMM, TEL, or HF receiver buttons in order to hear the receiver.
Both models of the KMA 24H have
“AUTO COMM” capability and always provide automatic headphone audio selection to match the transceiver in use. The selection of speaker audio can either be made automatically by pulling out the speaker “AUTO” switch or manually with the row of speaker audio select push buttons. Marker Beacon Receiver (KMA 24)
The complete TSO’d 3-light marker beacon
receiver built into the KMA 24 gives you an accurate visual and aural signal when you pass over a 75 MHz beacon. The blue, amber, and white lights on the faceplate—as well as the
audio tone—identify the beacon type (outer, middle or airway/inner marker).
Either the speaker or headphone MKR
buttons or both must be “in” for the marker beacon receiver to provide an audio signal at beacon passage.
The horizontal push button labeled SENS
on the lower left side of the console gives you the choice of two receiver sensitivities. When the button is “in,” the sensitivity is on HI. During an approach, this setting should permit you to hear the outer marker tone about one mile out. At this point you may select LO to dampen the tone. It will start to sound again when you are closer to the marker, giving you a more precise indication of its location.
Pressing the top horizontal button marked
“TST” simply applies voltage to all three lamps to show that they are functioning.
Note: The TST button should not be pressed
to test the lamps when autopilot coupled on an ILS approach inside the outer marker. This is due to the fact that some autopilots (including Bendix/King autopilots) use the marker annunci- ation to change the sensitivity of the autopilot.
A photocell in the console automatically
dims the lamps for night operation.
The “INT” position on the KMA 24 and
the “PA” position on the KMA 24H permit the flight crew to address cabin occupants over the cabin speaker. To do this, select “INT” or “PA” with the microphone switch. When the mike is keyed, the receiver audio is muted and you may talk normally into the microphone to broadcast over the speaker.
The KMA 24H also has an “EMG” position
on the microphone selector. This feature by- passes the KMA 24H’s audio amplifier and directly connects COMM 1 to the pilot’s microphone and headphones. This provides a fail-safe method of communication should the unit fail.
The KMA 24 and KMA 24H also have
an “EXT” position on the microphone selector switch which connects the microphone to an external ramp hailer speaker, if installed.
KMA 24H Intercom
The KMA 24H has a built-in five-station
intercom with two dedicated amplifiers. Intercom operation may be “hot mike,” in which the intercom is active all the time; voice activated (VOX), in which the intercom becomes active automatically when a crew member begins to speak; or keyed activation, in which a separate microphone switch must be keyed to activate the intercom. Selection of the desired method of microphone activation is accomplished with the intercom VOX sensitivity control (outer concentric knob on left side of unit).
Turn it to the fully clockwise detent position
for hot mike operation. Turn the knob all the way counterclockwise past the detent for
keyed microphone operation. (Note: a separate intercom key switch must be included in the installation in order to use keyed intercom operation.) In the middle range, the switch selects VOX, and the rotation of this knob also adjusts the sensitivity of the voice activated switch.
In order to set the proper VOX sensitivity,
first turn the VOX sensitivity control clockwise until a hissing sound is heard in the headphones. Next turn the control counterclockwise until the hissing sound stops. The VOX is now properly set for the present noise environment. It is normal to have to reset the VOX sensitivity level whenever the noise in the cockpit/cabin changes, such as when making large power setting changes.
The inner concentric knob is the intercom
volume control this adjusts the intercom volume without affecting the volume of the selected receiver audio inputs.
When either the pilot or copilot keys
the microphone to transmit, all other intercom microphone inputs are muted, which ensures that the keyed microphone is the single source of transmitted audio. All receiver inputs are also muted during transmissions.
Marker Beacon Lights
Photocell For Automatic Dimming
Marker Beacon Sensitivity Select Button
Headphone Audio Select Buttons Microphone
Selector Switch
Speaker Audio Select Buttons
Marker Beacon Lamp Test Button
KMA 24 With “Auto” Feature And Radiotelephone KMA 24 H With Second ADF and Ramp Halker
Speaker Audio Select Buttons
Speaker AUTO Switch
Microphone Selector Switch (including emergency, PA, and ET ramp hailer positions)
AUTO Select Buttons
Intercom VOX Sensitivity Control
Headphone Auto Select Buttons
Operating the KMA 24/24H Audio Control Systems
Tear off this section for a convenient pilot’s operating manual.

Intercom
Volume
Control
KMA 24 Audio Control System
Compact TSO’d consoles make audio control “push button simple”
KMA 24H Audio Control System
Marker Beacon Lights
Photocell For Automatic Marker Lamp Dimming
Marker Beacon Sensitivity Select Button Headphone Audio Select Buttons
Microphone Selector Switch
HF Position (Replaced With TEL Position When HF Transceiver Not Installed)
Second Pair of ADF Buttons (AUTO Buttons May Be Substituted)
Speaker AUTO Switch
5 COMMs and One ADF
Speaker Audio Select Buttons
HF Select Buttons (TEL Buttons May Be Substituted)
Intercom Volume Control
Intercom VOX Sensitivity Control
Headphone Audio Select Buttons Microphone
Selector Switch (including emergency and PA positions)
Microphone Selector Switch (including emergency, PA, and EXT ramp hailer positions)
4 COMMs And Two ADFs
AUTO Select Buttons
Speaker Audio Select Buttons
Marker Beacon Lamp Test Button
Push button simplicity puts complete,
flexible audio control right at your fingertips with Bendix/King’s easy-to-use KMA 24 and KMA 24H systems.
Each is self-contained, all solid-state
and stands only 1.3 inches high in your Silver Crown stack. The “slant top” package tailors it for the top slot in your instrument panel.
The KMA 24 controls as many as three
transceivers and six receivers, including the internal marker beacon receiver and its automatically dimmed 3-light presentation. The KMA 24H controls up to five transceivers and five receivers, or four transceivers and six receivers.
The KMA 24H replaces the internal marker
beacon receiver with an intercom, which provides unprecedented flexibility. The intercom features capability for hot mike, voice activation (VOX), or keyed activation of up to five intercom stations. In hot mike operation all intercom microphones remain active at all times whether the operator is talking on intercom or not. Voice activated operation has the microphone active only when the operator begins to talk. In keyed operation, the operator may depress a separate intercom switch to activate the microphone for intercom usage.
When two KMA 24H’s are installed, dual
transmit flexibility is provided–allowing the pilot and copilot or another crew member to talk on different transmitters simultaneously while providing pilot priority if the same transmitter is keyed by both crew members at the same time.
The KMA 24H also includes voice recorder
compatibility and an emergency mode, which connects the pilot’s headphones and microphone directly to COMM 1 in the event of a KMA 24H failure or a power interruption to the KMA 24H.
The KMA 24 and KMA 24H provide
transceiver and receiver outputs to speaker or headphones or both. A separate isolation amplifier for headphones maintains constant, noise-free volume levels, even when several receivers are monitored at once. Keying a mike mutes all receivers automatically to eliminate feedback.
The KMA 24 is offered in four configurations
and the KMA 24H in two configurations, so you can choose the one that best matches your requirements.
You’ll find more detailed information,
specifications, and a convenient tear-off Pilot’s Guide for both units on the following pages.
Audio Control With The KMA 24
Two rows of alternate-action push buttons
on the KMA 24 console control all receiver audio distribution functions.
The top row of push buttons selects receivers
for the cockpit speaker, the bottom row for head- phones. Both rows are completely independent of each other, allowing selection of speaker or headphones, or both, for all combinations of receivers.
The rotary selector switch on the right side
of the console connects the microphone to either COMM 1 or COMM 2. An additional switch position allows selection of radiotelephone on some KMA 24 models, or of HF on other models of the KMA 24. Other switch positions are for cabin address and ramp hailer.
Turning the microphone selector switch
to OFF cuts power to the speaker amplifier and the marker beacon receiver. The headphone amplifier remains in operation.
The AUTO feature, when engaged,
automatically matches the corresponding receiver audio with the selected transmitter, such as COMM 1, COMM 2, TEL or HF transmitter. An option allows the AUTO feature to be replaced by a second ADF receiver position.
The unit operates on either 13.75 volts
or 27.5 volts without the use of adapters or converters.
Built-In Marker Beacon
The KMA 24 has a built-in, crystal
controlled, superheterodyne marker beacon receiver with a three-light display. Its excellent selectivity eliminates interference from FM radio and TV stations. Dimming circuitry automatically adjusts the brightness of the lamps to a level appropriate for ambient cockpit light.
The lower push button next to the marker
lamps selects high and low sensitivity; the upper push button tests the lights.
The unit can also drive remote marker beacon
lights, such as those in Bendix/King Autopilot Annunciator Panels or the KA 40 Remote Marker Light display.
Five-Station Voice Activated Intercom
In the KMA 24H, a five-station intercom
replaces the KMA 24’s integral marker beacon receiver and lights. The intercom includes three modes of operation: hot mike, voice activated (VOX) or keyed activation for up to five intercom stations.
In single KMA 24H installations, the pilot’s
microphone has priority over the crew member’s microphone in the vent both are trying to transmit at the same time.
In a dual KMA 24H installation the pilot
and a crew member can talk on different transmitters at the same time; however, the pilot will automatically have priority if he keys the mike while another crew member is using the same transmitter.
An emergency position (EMG) on the
microphone selection switch connects the pilot’s mike and headphones directly to COMM 1 as a means of fail-safe communication in the event of a failure within the KMA 24H.
Since the KMA 24H has an integral intercom,
a “PA” position replaces the “INT” position on the microphone selection switch. In aircraft equipped with a cabin speaker, this position allows the pilot or copilot to make announcements to the passengers.
KR 21 Marker Beacon Receiver
The cockpit can easily have marker beacon
reception and display as well as the convenience of the KMA 24H’s built-in five-station intercom. The TSO’d Bendix/King KR 21 Marker Receiver provides marker beacon audio signals to the KMA 24H and has a marker light display similar to that in the KMA 24.
The KR 21 is self-contained and can
be mounted anywhere in the panel, either horizontally or vertically. It is all solid-state and has its own self-test and automatic dimming.
“Auto” Receiver
Audio Select
For KMA 24 models equipped with
the “AUTO” receiver Audio select feature,
the transmitter selected with the microphone
selector switch will be matched automatically
with the appropriate COMM receiver audio on
either headphone or speaker, or both, by simply
pressing the desired headphone and/or speaker
“AUTO” push button. (COMM 1 and COMM 2
push buttons should be disengaged unless it is
desired to additionally listen to a COMM
receiver other than the one selected with the
microphone selector switch.)
Thus, on “AUTO” you may change the
rotary microphone switch back and forth, as
needed, without having to reselect the corre-
sponding COMM, TEL, or HF receiver buttons
in order to hear the receiver.
Both models of the KMA 24H have
“AUTO COMM” capability and always provide
automatic headphone audio selection to match
the transceiver in use. The selection of speaker
audio can either be made automatically
by pulling out the speaker “AUTO” switch
or manually with the row of speaker audio
select push buttons.
Marker Beacon Receiver
(KMA 24)
The complete TSO’d 3-light marker beacon
receiver built into the KMA 24 gives you an
accurate visual and aural signal when you pass
over a 75 MHz beacon. The blue, amber, and
white lights on the faceplate—as well as the
audio tone—identify the beacon type (outer,
middle or airway/inner marker).
Either the speaker or headphone MKR
buttons or both must be “in” for the marker
beacon receiver to provide an audio signal
at beacon passage.
The horizontal push button labeled SENS
on the lower left side of the console gives you
the choice of two receiver sensitivities. When
the button is “in,” the sensitivity is on HI.
During an approach, this setting should permit
you to hear the outer marker tone about one
mile out. At this point you may select LO
to dampen the tone. It will start to sound again
when you are closer to the marker, giving you
a more precise indication of its location.
Pressing the top horizontal button marked
“TST” simply applies voltage to all three lamps
to show that they are functioning.
Note: The TST button should not be pressed
to test the lamps when autopilot coupled on
an ILS approach inside the outer marker. This
is due to the fact that some autopilots (including
Bendix/King autopilots) use the marker annunci-
ation to change the sensitivity of the autopilot.
A photocell in the console automatically
dims the lamps for night operation.
The “INT” position on the KMA 24 and
the “PA” position on the KMA 24H permit the
flight crew to address cabin occupants over
the cabin speaker. To do this, select “INT”
or “PA” with the microphone switch. When
the mike is keyed, the receiver audio is muted
and you may talk normally into the microphone
to broadcast over the speaker.
The KMA 24H also has an “EMG” position
on the microphone selector. This feature by-
passes the KMA 24H’s audio amplifier and
directly connects COMM 1 to the pilot’s
microphone and headphones. This provides
a fail-safe method of communication should
the unit fail.
The KMA 24 and KMA 24H also have
an “EXT” position on the microphone selector
switch which connects the microphone to an
external ramp hailer speaker, if installed.
KMA 24H Intercom
The KMA 24H has a built-in five-station
intercom with two dedicated amplifiers.
Intercom operation may be “hot mike,” in which
the intercom is active all the time; voice
activated (VOX), in which the intercom
becomes active automatically when a crew
member begins to speak; or keyed activation,
in which a separate microphone switch must
be keyed to activate the intercom. Selection
of the desired method of microphone activation
is accomplished with the intercom VOX
sensitivity control (outer concentric knob
on left side of unit).
Turn it to the fully clockwise detent position
for hot mike operation. Turn the knob all
the way counterclockwise past the detent for
keyed microphone operation. (Note: a separate
intercom key switch must be included in the
installation in order to use keyed intercom
operation.) In the middle range, the switch
selects VOX, and the rotation of this knob
also adjusts the sensitivity of the voice
activated switch.
In order to set the proper VOX sensitivity,
first turn the VOX sensitivity control clockwise
until a hissing sound is heard in the headphones.
Next turn the control counterclockwise until
the hissing sound stops. The VOX is now
properly set for the present noise environment.
It is normal to have to reset the VOX sensitivity
level whenever the noise in the cockpit/cabin
changes, such as when making large power
setting changes.
The inner concentric knob is the intercom
volume control this adjusts the intercom
volume without affecting the volume of the
selected receiver audio inputs.
When either the pilot or copilot keys
the microphone to transmit, all other intercom
microphone inputs are muted, which ensures
that the keyed microphone is the single source
of transmitted audio. All receiver inputs are also
muted during transmissions.
Marker
Beacon
Lights
Photocell
For Automatic
Dimming
Marker Beacon
Sensitivity
Select Button
Headphone Audio Select Buttons Microphone
Selector
Switch
Speaker Audio Select Buttons
Marker Beacon
Lamp Test Button
KMA 24 With “Auto” Feature And Radiotelephone KMA 24 H With Second ADF and Ramp Halker
Speaker Audio Select Buttons
Speaker
AUTO
Switch
Microphone
Selector Switch
(including emergency,
PA, and ET ramp hailer
positions)
AUTO
Select
Buttons
Intercom VOX
Sensitivity
Control
Headphone Auto Select Buttons
Operating the KMA 24/24H
Audio Control Systems
Tear off this section for a convenient pilot’s operating manual.

KMA 24 and KMA 24H Bendix/King Audio Control Systems
KMA 24 and KMA 24H
Bendix/King
Audio Control Systems
Honeywell 23500 W. 105th Street, Olathe, KS 66061-1950 Telephone [phone] Fax [phone] Toll-Free in U.S. 877.712.2386 www.bendixking.com
Honeywell
23500 W. 105th Street, Olathe, KS 66061-1950
Telephone [phone] Fax [phone]
Toll-Free in U.S. 877.712.2386
www.bendixking.com
©
2000 Honeywell
2/00 006-08316-0008 5K Printed in U.S.A.
Policy Notice: In keeping with Honeywell’s goal of constant product improvement, product specifications and design features may be altered without notice. Avionics installation requires special skills, tools and equipment. Our limited warranty is valid only for equipment installed in accordance with our sales policy.
Optional Intercom Modes
The optional installation of a remote,
three-position switch for intercom operations
with the KMA 24H provides three modes:
Isolate, Normal (NORM) and Private. In Isolate,
the pilot takes himself out of the intercom loop
while the other four intercom positions remain
active. In Normal, all five intercom positions are
tied together. In Private, the pilot and copilot
positions are linked together for two-station
hot mike operation. At the same time, the other
three intercom positions have independent
three-station intercom operation.
Receiver Selection
The top row of push buttons on the
console controls the audio selection for the
speaker, and the bottom row selects audio for
headphones. The selections are independent,
and any audio input can be selected for speaker
or headphones or both. These push buttons
allow audio selection independent of the AUTO
feature described earlier.
The KMA 24 and KMA 24H can control
as many as six receivers. Both units also have
two unswitched inputs for uses such as the radar
altimeter audio alert or the ring signal from
a radiotelephone.
To listen to a specific receiver, simply
press the corresponding headphone or speaker
button “in.” To disconnect that receiver, press
the button again. It will return to the “out”
position.
For both the KMA 24 and KMA 24H,
volume of audio input from transceivers and
receivers is set with the volume controls of
each individual radio.
Transmitter Selection
The rotary switch on the right side of
the KMA 24 and KMA 24H consoles selects
the desired transmitter for the cockpit micro-
phones. In the KMA 24, the off position shuts
off power to the speaker amplifier and marker
beacon receiver. (The headphone amplifier
operates whenever the aircraft electric power
is on.)
With the KMA 24, the next position
of the rotary switch may be either “TEL”
(radiotelephone) or “HF” (high frequency
transceiver.) The former is more likely to be
found in aircraft used mostly for domestic
operations, the latter for international operations.
The COMM 1 and 2 positions (COMM
1-4 or 1-5 for KMA 24H) are for transmitting
on the frequencies set up on those respective
communication transceivers.
The “INT”, “PA” and “EXT”, and “EMG”
positions are discussed above.
Other Combinations Of Features
KMA 24 KMA24H
KMA 24 with TEL and ADF 1 and 2 KMA 24H with 4 COMMs and 2 ADFs
KMA 24 with HF and AUTO KMA 24H with 5 COMMs and 1 ADF
KMA 24 with HF and ADF 1 and 2
Specifications TSO Compliance: Marker Beacon Receiver: TSO C35d, Class A KMA24—Env. Cat. A1D1/A/PKS/ XXXXXXZBAAA Audio Amplifier: TSO C50b KMA 24H—Env. Cat. A2D1/A/KPS/ XXXXXXB/AB/BZ/A Weight: 1.7 lb. (0.77kg) Physical Dimensions: Length behind panel: 6.8 in. (17.30 cm) Width: 6.25 in. (15.88 cm) Height: 1.3 in. (3.30 cm) Duty Cycle: Continuous Power Requirements (not including instruments lights):
KMA 24 13.75v 27.5v
Idle current, mike
switch on 110 ma 170 ma
Idle current, mike Less than Less than
switch off 8 ma 16 ma
Max. operating
current 1.9 a 1.9 a
KMA 24H
Idle current 350 ma 500 ma
Max. operating
current 1.8 a 1.8 a
Temperature Range: -20ºC to +55º with brief operation at +70ºC (KMA 24), -20ºC to +70ºC continuous (KMA 24H) Marker Beacon Receiver (KMA 24 only) Frequency: Crystal-controlled at 75 MHz Sensitivity: LO 1,000µv Hard
HI 200µv Hard
Selectivity: 6 db at ± 10 kHz Min.
40 db at ± 200 kHz Max.
Input Impedance: 50 ohms Output: Capable of 4 mw into isolation amplifier impedance of 500 ohms.
Isolation Amplifiers: KMA 24 Inputs: KMA 24 models without AUTO accommodate three transceivers and six external receivers. Models with the AUTO function accommodate three trans- ceivers and five external receivers. All models also have two unswitched inputs. (Typical use: radar altimeter aural warning and radiotelephone ringer.) KMA 24H Inputs: KMA 24H models accommodate five transceivers and five external receivers or four transceivers and six receivers. All models also have two unswitched inputs. (Typical use: radar altimeter aural warning and radiotele- phone ringer.) KMA 24 Input Impedance: 500 ohms KMA 24H Input Impedance: 320 ohms for all ICS inputs, 500 ohms for all audio inputs Input Isolation: KMA 24: 40 db between inputs KMA 24H: 60 db between inputs Input Muting (when mike is keyed): At least 55 db Speaker Output: With 13.75v Supply: Into 4 ohm load: 7 w (KMA 24)
6 w (KMA 24H)
Into 8 ohm load: 4 w Into 8 ohm load from
8 ohm tap: 6 w (KMA 24H)
With 27.5v Supply: Into 4 ohm load: 12 w (KMA 24)
10 w (KMA 24H)
Into 8 ohm load: 6.5 w Into 8 ohm load
from 8 ohm tap: 10 w (KMA 24H)
Headphone Output: KMA 24: 50 mw into 500 ohm load KMA 24H:
With 27.5v supply: 120 mw into each
500 ohm load
With 13.75v supply: 20 mw into each
500 ohm load
Output Characteristics: Distortion: Less than 5 percent at rated
output
Frequency response: KMA 24: Within 6 db from 350 hz to
6,000 hz
KMA 24H: Within 3 db from 350 hz to
6,000 hz

KMA 24 and KMA 24H
Bendix/King
Audio Control Systems
KMA 24 and KMA 24H Bendix/King Audio Control Systems
Honeywell
23500 W. 105th Street, Olathe, KS 66061-1950
Telephone [phone] Fax [phone]
Toll-Free in U.S. 877.712.2386
www.bendixking.com
Honeywell 23500 W. 105th Street, Olathe, KS 66061-1950 Telephone [phone] Fax [phone] Toll-Free in U.S. 877.712.2386 www.bendixking.com
© 2000 Honeywell
2/00 006-08316-0008 5K Printed in U.S.A.
Policy Notice: In keeping with Honeywell’s goal of constant
product improvement, product specifications and design
features may be altered without notice.
Avionics installation requires special skills, tools and equipment.
Our limited warranty is valid only for equipment installed in
accordance with our sales policy.
Optional Intercom Modes
The optional installation of a remote,
three-position switch for intercom operations with the KMA 24H provides three modes: Isolate, Normal (NORM) and Private. In Isolate, the pilot takes himself out of the intercom loop while the other four intercom positions remain active. In Normal, all five intercom positions are tied together. In Private, the pilot and copilot positions are linked together for two-station hot mike operation. At the same time, the other three intercom positions have independent three-station intercom operation. Receiver Selection
The top row of push buttons on the
console controls the audio selection for the speaker, and the bottom row selects audio for headphones. The selections are independent, and any audio input can be selected for speaker or headphones or both. These push buttons allow audio selection independent of the AUTO feature described earlier.
The KMA 24 and KMA 24H can control
as many as six receivers. Both units also have two unswitched inputs for uses such as the radar altimeter audio alert or the ring signal from a radiotelephone.
To listen to a specific receiver, simply
press the corresponding headphone or speaker
button “in.” To disconnect that receiver, press the button again. It will return to the “out” position.
For both the KMA 24 and KMA 24H,
volume of audio input from transceivers and receivers is set with the volume controls of each individual radio. Transmitter Selection
The rotary switch on the right side of
the KMA 24 and KMA 24H consoles selects the desired transmitter for the cockpit micro- phones. In the KMA 24, the off position shuts off power to the speaker amplifier and marker beacon receiver. (The headphone amplifier operates whenever the aircraft electric power is on.)
With the KMA 24, the next position
of the rotary switch may be either “TEL” (radiotelephone) or “HF” (high frequency transceiver.) The former is more likely to be found in aircraft used mostly for domestic operations, the latter for international operations.
The COMM 1 and 2 positions (COMM
1-4 or 1-5 for KMA 24H) are for transmitting on the frequencies set up on those respective communication transceivers.
The “INT”, “PA” and “EXT”, and “EMG”
positions are discussed above.
Other Combinations Of Features KMA 24 KMA24H KMA 24 with TEL and ADF 1 and 2 KMA 24H with 4 COMMs and 2 ADFs KMA 24 with HF and AUTO KMA 24H with 5 COMMs and 1 ADF KMA 24 with HF and ADF 1 and 2
Specifications
TSO Compliance:
Marker Beacon Receiver: TSO C35d,
Class A
KMA24—Env. Cat. A1D1/A/PKS/
XXXXXXZBAAA
Audio Amplifier: TSO C50b
KMA 24H—Env. Cat. A2D1/A/KPS/
XXXXXXB/AB/BZ/A
Weight: 1.7 lb. (0.77kg)
Physical Dimensions:
Length behind panel: 6.8 in. (17.30 cm)
Width: 6.25 in. (15.88 cm)
Height: 1.3 in. (3.30 cm)
Duty Cycle: Continuous
Power Requirements (not including
instruments lights):
KMA 24 13.75v 27.5v
Idle current, mike
switch on 110 ma 170 ma
Idle current, mike Less than Less than
switch off 8 ma 16 ma
Max. operating
current 1.9 a 1.9 a
KMA 24H
Idle current 350 ma 500 ma
Max. operating
current 1.8 a 1.8 a
Temperature Range: -20ºC to +55º with
brief operation at +70ºC (KMA 24),
-20ºC to +70ºC continuous (KMA 24H)
Marker Beacon Receiver
(KMA 24 only)
Frequency: Crystal-controlled at 75 MHz
Sensitivity: LO 1,000µv Hard
HI 200µv Hard
Selectivity: 6 db at ± 10 kHz Min.
40 db at ± 200 kHz Max.
Input Impedance: 50 ohms
Output: Capable of 4 mw into isolation
amplifier impedance of 500 ohms.
Isolation Amplifiers:
KMA 24 Inputs: KMA 24 models without
AUTO accommodate three transceivers
and six external receivers. Models with the
AUTO function accommodate three trans-
ceivers and five external receivers. All
models also have two unswitched inputs.
(Typical use: radar altimeter aural warning
and radiotelephone ringer.)
KMA 24H Inputs: KMA 24H models
accommodate five transceivers and five
external receivers or four transceivers and
six receivers. All models also have two
unswitched inputs. (Typical use: radar
altimeter aural warning and radiotele-
phone ringer.)
KMA 24 Input Impedance: 500 ohms
KMA 24H Input Impedance: 320 ohms
for all ICS inputs, 500 ohms for all
audio inputs
Input Isolation:
KMA 24: 40 db between inputs
KMA 24H: 60 db between inputs
Input Muting (when mike is keyed):
At least 55 db
Speaker Output:
With 13.75v Supply:
Into 4 ohm load: 7 w (KMA 24)
6 w (KMA 24H)
Into 8 ohm load: 4 w
Into 8 ohm load from
8 ohm tap: 6 w (KMA 24H)
With 27.5v Supply:
Into 4 ohm load: 12 w (KMA 24)
10 w (KMA 24H)
Into 8 ohm load: 6.5 w
Into 8 ohm load
from 8 ohm tap: 10 w (KMA 24H)
Headphone Output:
KMA 24: 50 mw into 500 ohm load
KMA 24H:
With 27.5v supply: 120 mw into each
500 ohm load
With 13.75v supply: 20 mw into each
500 ohm load
Output Characteristics:
Distortion: Less than 5 percent at rated
output
Frequency response:
KMA 24: Within 6 db from 350 hz to
6,000 hz
KMA 24H: Within 3 db from 350 hz to
6,000 hz