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5.F.(3)
External Data Keyline HI (J10531-38) EXT DATA KEYLINE H
When the external resistance between the EXTERNAL DATA KEYLINE HI and
LO pins is ten ohms or less, the KRX 1053 Receiver/Exciter activates the
transmitter and uses the audio at the EXTERNAL MODEM AUDIO INPUT as
the modulation source.
The EXTERNAL DATA KEYLINE LO pin may be connected externally to
airframe ground in some installations.
The KRX 1053 Receiver/Exciter interprets a resistance of 10 ohms or less
between the EXTERNAL DATA KEYLINE HI and LO pins as a command to
transmit, whether the LO pin is grounded or left floating.
This input is continuously read.
5.F.(4)
Voice Push-To-Talk HI- (J10531-16) VO PTT H
When the external resistance between the VOICE PUSH-TO-TALK HI and LO
pins is ten ohms or less, the KRX 1053 Receiver/Exciter activates the
transmitter and uses the audio at the MIC AUDIO INPUT as the modulation
source.
The KRX 1053 Receiver/Exciter interprets a resistance of 10 ohms or less
between the VOICE PUSH-TO-TALK HI and LO pins as a command to
transmit, whether the LO pin is grounded or left floating.
This input is continuously read.
NOTE: The VOICE PUSH-TO-TALK LO pin may be connected externally to
airframe ground in some installations.
5.F.(5)
Other Side PTT- (J10531-37) OTHER SIDE PTT
When asserted (grounded), the OTHER SIDE PTT input prevents the system
from transmitting.
This input is continuously read.
In a dual system installation, when this input is connected to the KEY EVENT
output of the KRX 1053 Receiver/Exciter in the opposite system, it prevents this
system from transmitting whenever the KEY EVENT of the other system is
asserted.
Revison 2
N
KHF 1050 SYSTEM INSTALLATION MANUAL
23-10-09
Page 2038
Apr/2006
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