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Preliminary - Subject to Change Without Notice
3.B.(5) Data Mode
When the KRX 1053 Receiver/Exciter is operating in the
DATA mode, interface with data modems or secure voice
systems is enabled. The external modem inputs and external
modem outputs are available to bypass squelch and
compression functions in the KRX 1053. These levels are
controlled by field adjustments.
A 4 dB variation is possible in the audio response when
operating in the data mode.
Audio modulation from the modem is applied to the EXTERNAL
MODEM AUDIO INPUT. When the DATA KEYLINE is grounded, the
transmitter modulation is derived from the DATA AUDIO
INPUT rather than from the microphone.
3.B.(6) SELCAL Mode
NOTE: SELCAL mode requires a SELCAL decoder, not
SELCAL (SELective CALling) may be used to relieve
background noises during flight. The volume may be turned
down completely while the system maintains a watch for a
SELCAL coded audio signal.
When a decoded SELCAL signal is received, a call waiting
is indicated. The SELCAL decoder generates an audio alert
for the crew.
The SELCAL AUDIO OUTPUT is connected to the external
SELCAL decoder. Regardless of the operating mode selected
by the pilot, the SELCAL AUDIO OUTPUT is derived from an
AM receiver inside the KRX 1053.
Revision 0
10640I00.SLK
N
KHF 1050 SYSTEM INSTALLATION MANUAL
supplied.
23-10-09
Page 21
Mar/2003
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