Operation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
5.D.(1)(g) Maintenance Test- (J10531-78) MAINT TEST
5.D.(1)(h) Stuck MIC Protection- (J10531-36) STUCK MIC PTCT
5.D.(1)(i) External Data Keyline HI (J10531-38) EXT DATA KEYLINE H
Revision 0
10640I00.SLK
KHF 1050 SYSTEM INSTALLATION MANUAL
The KRX 1053 Receiver/Exciter processor samples the
state of this discrete input only at initial power
application. The state of this discrete is assumed not
to change during operation.
hen the MAINTENANCE TEST discrete input is asserted,
the KRX 1053 Receiver/Exciter RS-232 Maintenance port
accepts test modes including the generation of a
two-tone PEP test signal.
This input is continuously read.
When the STUCK MIC PROTECTION discrete input is
asserted, the receiver/exciter stops transmitting after
a transmission duration equal to a constant set in
non-volatile memory during manufacturing test or
service center test.
• This time duration can be set to a value between 30
seconds and 240 seconds. The default time is 120
seconds.
• The KRX 1053 Receiver/Exciter processor samples the
state of this discrete input only at initial power
application. The state of this discrete is assumed
to not change during operation.
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 KRX 1053 Receiver/Exciter drives a current of at
least ten milliamps through any resistance of ten ohms
or less between the EXTERNAL DATA KEYLINE HI and LO
pins.
The EXTERNAL DATA KEYLINE LO pin may be connected
externally to airframe ground in some installations.
N
23-10-09
Page 2032
Mar/2003