Com Setup Page (Gnc 420W And Gns 430W Only); Figure 5-15. Com Setup Page - Garmin GPS 400W Installation Manual

5.3.12 COM SETUP Page (GNC 420W and GNS 430W Only)

Select the COM SETUP Page (see Figure 5-15). These
values are set at the factory and seldom require
calibration.
FREQ
Selects a VHF communication frequency. For purposes
of setting the squelch and sidetone levels, only the
frequencies 118.000, 127.000, and 136.975 MHz can be
used.
SPACING
Selection
25.0 kHz
8.33 kHz
8.33 kHz channels are not authorized for use in the United States.
SQ 250
Sets the squelch threshold for 25 kHz channel spacing operation. May be set to any value between 0
(zero) and 63. The higher the number, the less signal is required to break squelch.
For GNC 420W or GNS 430W units with COM software 2.00 or earlier, the operation of
the SQ 250 setting is reversed. The higher the SQ 250 number, the more signal is
required to break squelch.
SQ 833
Sets the squelch threshold for 8.33 kHz channel spacing operation. May be set to any value between 0
(zero) and 63. The higher the number, the more signal is required to break squelch.
SIDE
Sets the sidetone audio output level. May be set to any value between 0 (zero) and 63.
The sidetone audio output level is independent of the COM volume knob on the 400W
Series unit.
Store Calibration?
Select this field and press the ENT key to accept the squelch threshold and sidetone audio settings on this
page. If you wish for the squelch and sidetone settings to return to their previous values, do not select this
field. Simply change to the next configuration page, or turn off the unit if you are done with
configuration.
Selection
PTT
XFR
RX
TX
Page 5-16
Rev. G
Description
Selects traditional 25 kilohertz spacing (760 channel).
Selects 8.33 kilohertz channel spacing, which is required in some
areas of the world.
CAUTION
Verify That:
The box is filled in while the COM push-to-talk switch is pressed.
The box is filled in while a remote COM transfer switch is pressed.
The box is filled in while the COM is receiving a signal.
The box is filled in while the COM push-to-talk switch is pressed.

Figure 5-15. COM SETUP Page

NOTE
NOTE
400W Series Installation Manual
190-00356-02