Page 1-6 400 SERIES INSTALLATION MANUAL
Page Rev L P/N 190-00140-02
1.3.6 LOC Specifications (GNS 430 Only)
Regulatory Compliance TSO C36e, JTSO-C36e, RTCA DO-195 CLASS A, EuroCAE
ED-46B
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 shall not vary more than 3
dB.
Selectivity Nose Bandwidth: The input signal level required to produce
the reference AGC voltage shall 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 shall 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 Ω 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 shall not exceed
10% at all levels up to 100 mW.
1.3.7 Glideslope Specifications (GNS 430 Only)
Regulatory Compliance TSO C34e, JTSO-C34e, RTCA DO-192, EuroCAE ED-47B
Sensitivity -87 dBm or less for 60% of standard deflection.
Centering Accuracy
0 ± .0091 ddm or 0 ± 7.8 mV
Selectivity
The course deviation shall be 0 ddm ± .0091ddm when using
the Glideslope Centering Test Signal as the RF frequency is
varied ±17 kHz from the assigned channel.
At frequencies displaced by ±132 kHz or greater, the input
signal shall be at least 60 dB down.
Standard deflection a) With a standard deflection ‘FLY DOWN’ condition (90 Hz
dominant), the output shall be -78 mV ± 7.8 mV.
b) With a standard deflection ‘FLY UP’ condition (150 Hz
dominant), the output shall be +78 mV ± 7.8 mV.
Flag The unit Flags:
a) When the level of a standard deviation test signal
produces 50% or less of standard deflection of the deviation
indicator.
b) In the absence of 150 Hz modulation.
c) In the absence of 90 Hz modulation.
d) In the absence of both 90 Hz and 150 Hz modulation.
e) In the absence of RF.
