Page 1-6
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
1.3.7
Glideslope Specifications (GTN 650 Only)
Characteristics
Specifications
Sensitivity
-87 dBm or less for 60% of standard deflection.
Centering Accuracy
0 ±0.01183 ddm or 0 ±10.14 mV
Selectivity
The course deviation is 0 ddm .0091 ddm 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
With a standard deflection „FLY DOWN‟ condition (90 Hz dominant),
the output is -78 mV ±7.8 mV.
With a standard deflection „FLY UP‟ condition (150 Hz dominant), the
output is +78 mV ±7.8 mV.
Flag
The unit flags when:
the level of a standard VOR 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 modulations are both absent.
RF signals are absent.
Table 1-2. GTN Current Specifications
LRU
14 Volt Current Draw
28 Volt Current Draw
Typical
Maximum
Typical
Maximum
GTN 625
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
GTN 635
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
COM Connector
0.45 A
5.66 A (16W COM)
4.02 A (10W COM)
0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
GTN 650
Main Connector
1.6 A [1]
2.8 A [2]
0.8 A [1]
1.5 A [2]
COM Connector
0.45 A
5.66 A (16W COM)
4.02 A (10W COM)
0.21 A
2.33 A (16W COM)
1.76 A (10W COM)
NAV Connector
0.60 A
1.16A [2]
0.30 A
0.58 A [2]
[1]
The specified current draw is with the display backlight set to 100% and the fan operating
at low speed. If the superflags are connected, their current draw must be added in
addition to the specified current.
[2]
The specified current draw does not include the superflags. If connected, their current
draw must be added to the specified current. The superflags will supply up to 320 ma
each regardless of the input voltage.
