Receiver Performance Check; Fault Isolation - Honeywell KHF 1050 System Installation Manual

Preliminary - Subject to Change Without Notice
Impedance sensors
Note 1: The Label 351 information is actually sent by the KRX
1053 in response to RS-422 serial data sent by the KAC 1052 to
the KRX 1053.
7. In the event that a problem is detected during either the
turn-on test or the pilot-activated self-test, an error
message will appear on the controller. The error message
may indicate a failure of one or more of the following:
• Controller
• Receiver/Exciter
• Power Amplifier
• Antenna Coupler
Refer to Section 3, Fault Isolation Checklist.
2.B. Receiver Performance Check
1. If an operating frequency is properly displayed on the
controller, listen to the speaker or headphones. Ensure
that the aircraft audio panel is properly set to select
the HP audio.
2. Select the USB Voice (UV) mode, SBH type squelch. (SBH is
the default squelch type. If using an RM855, only the SB
type is available.) Adjust the squelch level to OFF.
Adjust the volume control on the PS440 controller, and/or
the volume control on the audio panel. Depending on the
frequency or channel selected, a signal may be heard - or
perhaps just atmospheric static.
NOTE: If the aircraft is located in a metal hangar, both
Select a channel with a known usable signal. One
possibility is one of the time-and-frequency standard
stations operating on frequencies of 2500.0 MHz, 5000.0
MHz, 10000.0 kHz, 15000.0 kHz or 20000.0 kHz.
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KHF 1050 SYSTEM INSTALLATION MANUAL
Antenna Coupler BITE Matrix
TablE 1003
signals and noise may be weak. It is advisable to
have the aircraft outside the hangar to perform the
receiver or transmitter tests.
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