Page 6-14
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
GPS SELECT
When in GPS mode, the GPS Select discrete is unasserted (open) whenever a GPS approach mode is
active
and
the pilot has enabled the A/P APR Outputs (an associated message is displayed telling the pilot
to enable the A/P APR Outputs). This setting will not allow the pilot to select automatic GPS to ILS CDI
transitions on the System Setup page (only manual transitions are permitted).
Selection
Description
Auto
When in GPS mode, the GPS Select discrete is unasserted (open) whenever
a GPS approach mode is active
– no associated messages appear and no
pilot action is required. The pilot is also allowed to select automatic or
manual GPS to ILS CDI transitions on the System Setup page.
Prompt
When in GPS mode, the GPS Select discrete is unasserted (open) whenever
a GPS approach mode is active
and
the pilot has enabled the A/P APR
Outputs (an associated message is displayed telling the pilot to enable the
A/P APR Outputs). This setting will not allow the pilot to select automatic
GPS to ILS CDI transitions on the System Setup page (only manual
transitions are permitted).
For Honeywell (Bendix/King) KFC 225 and KAP 140 autopilots.
GPS Antenna
Vertical Offset (ft)
Figure 6-16. Measurement of GPS Antenna Vertical Offset
6.6.10
COM Configuration Page (GTN 650 Only)
Access the COM Configuration page, as shown in Figure 6-17
by touching the ‗COM‘ key from the GTN Setup page. These
values are set at the factory and rarely require calibration. To
enable or disable the COM radio, touch the key to toggle
between ‗Enabled‘ and ‗Disabled‘. The COM radio defaults to
enabled state.
COM RF SQUELCH
This setting configures the RF squelch threshold for the COM
radio. The default setting is 0%. 0% is the most sensitive
(i.e. the weakest signal level necessary to break squelch).
Increasing the value will require a stronger signal to break squelch.
MIC 1 GAIN
This can be adjusted to -12, -6, 0, +6, +12 dB, +18 dB, +24 dB, or +30 dB. The default value is +12dB.
SIDETONE VOLUME
This parameter sets the audio sidetone output level. This value may be set to values between 0.0 dB and
63.0 dB in 0.5 dB increments. The default is 91 (-17.5 dB).
Figure 6-17. COM Configuration Page
