Cessna 172SPHUSR05 Pilot Operating Handbook page 295

CESSNA
MODEL 1 72S
BENDIX/KING KMA 26 AUDIO SELECTOR PANEL
The Bendix/King KMA 26 Audio Selector Panel is a combination
audio amplifier, an audio distribution panel intercom, and a marker
beacon receiver.
audio signals for the speaker system . All receiver audio distribution
functions are controlled by two rows of push buttons.
selector switch on the right side of the console con nects the
microphone to either EMG, Com 1 , Com 2, Com 3 or PA (Unused
position). All operating controls are shown and described in Figure
1 .
A crystal-controlled superheterodyne marker beacon receiver
with 3-light presentation is i ncorporated within the u n it.
circuitry for the marker lamps automatically adj usts brightness
appropriate to the cockpit ambient light level. Hi and Lo sensitivity
and lamp test functions are also provided .
Lig ht dimming for the audio control panel is manually controlled
by the RADI O light rheostat knob.
MARKER
I nner, Contin uous 6 dots/sec (3000 Hz)
Airway
Fan
&
Middle Alternate dots and dashes ( 1 300 Hz)
Outer
2 dashes/sec (400 Hz)
*When the identifying tone is keyed, the
respective indicating light will blink
accordingly.
July 8/98
SUPPLE M ENT 3 - FAA APPROVED
SUPPLE ENT
SECTION 1
GENERAL
The audio amplifier is for amplification of the
MARKER FACILITIES
IDE NTIFYING TONE
SECTION 9 - S UPPLEM E NTS
A rotary
Dim ming
LIGHT'"
White
Amber
Blue
S3-3