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GNS 400W Series Maintenance Manual
Page 2-9
190-00356-05
Rev. A
Table 2-7. Glideslope Specifications (GNS 430W Only)
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 is 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 when: a) 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.
