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Page 2-8
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
Table 2-6. LOC Specifications (GNS 430W Only)
Receiver Audio Sensitivity
At -103.5 dBm (S+N)/N shall not be less than 6
dB.
Course Deviation Sensitivity
-103.5 dBm or less for 60% of standard
deflection.
Flag
The LOC Course Deviation Flag must be
flagged: a) in the absence of an RF signal. b)
When either the 90 or 150 Hz modulating
signals is removed and the other is maintained
at its normal 20%. c) In the absence of both 90
and 150 Hz modulation. d) When the level of a
standard localizer deviation test signal
produces less than a 50% of standard
deflection.
AGC Characteristics
From -86 dBm and -33 dBm input of a
Standard VOR Audio Test Signal, audio output
levels does not vary more than 3 dB.
Selectivity
Nose Bandwidth: The input signal level
required to produce the reference AGC voltage
does not vary more than 6 dB over the input
signal frequency range of ± 9 kHz from the
assigned channel frequency. Skirt Bandwidth:
The input signal level required to produce
reference AGC voltage will be at least 70 dB
greater than the level required to produce
reference AGC voltage at the assigned
channel frequency at ± 36 kHz from the
assigned channel frequency.
Spurious Response
Greater than 80 dB.
Centering Accuracy
Typical 0 ± 3 mV (Max error 9.9 mV per RTCA
DO-195).
Audio Output
A minimum 100 mW into a 500 ohm load.
Audio Response
Less than 6 dB of variation between 350 and
2500 Hz. Except the 1020 Hz Ident Tone is at
least 20 dB down in voice mode.
Audio Distortion
The distortion in the receiver audio output does
not exceed 10% at all levels up to 100 mW.