190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 1-7
1.6 LOC Specifications
Table 1-7 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 LOC Course Deviation Flag indicates in the event of any of
the following conditions:
• The RF level of a standard LOC deviation test signal is such
that the deflection of the deviation indicator is less than 50% of
the standard deflection
• Absence of 150 Hz modulation
• Absence of 90 Hz modulation
• Absence of both 90 Hz and 150 Hz modulations
• Absence of RF signals
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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