190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 1-5
1.3.6 LOC Specifications
Characteristics Specifications
Receiver Audio Sensitivity At -103.5 dBm (S+N)/N is not less than 6 dB.
Course Deviation Sensitivity
At -103.5 dBm, deviation output is not to be less than 60% of
standard deflection when a LOC deviation test signal is applied.
Flag
The VOR/LOC Course Deviation Flag is flagged when:
• the level of a standard LOC deviation test signal produces
50% or less of standard deflection of the deviation indicator.
• 150 Hz modulation is absent.
• 90 Hz modulation is absent.
• 90 Hz and 150 Hz modulation are both absent.
• RF signals are absent.
AGC Characteristics
From -99 dBm to -13 dBm input of a standard localizer audio test
signal, audio output level does not vary more than 3 dB.
Selectivity
6 dB BW is greater than 9 kHz
69 dB BW is less than 36 kHz
Standard Deflection
With a standard deflection ‘FLY LEFT’ condition (90 Hz dominant),
the output is +90 mV ± 9 mV.
With a standard deflection ‘FLY RIGHT’ condition (150 Hz
dominant), the output is -90 mV ± 9 mV.
Spurious Response Greater than 60 dB
Centering Accuracy 0 +
0.01023 ddm or 0 + 9.9 mV
Audio Output A minimum 100 mW into a 500 load.
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz. In voice
mode, an IDENT tone of 1020 Hz Ident Tone is attenuated at least
20 dB down.
Audio Distortion
The distortion in the receiver audio output does not exceed 10% at
all levels up to 100 mW.
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