190-01553-00 GTR 200 Installation Manual
Rev. B Page 3-15
3.6.5.2 COM Tests Page
The COM Tests page (Figure 3-13) allows the installer to test the operation of the COM functions.
Refer to Section 3.6.4
to select the COM Tests Page.
Figure 3-13 COM Tests Page
Perform the below procedure to verify proper COM configuration.
1. Connect a headset to the pilot headset jacks.
2. Select the COM TESTS subpage.
3. Verify none of the checkboxes are checked. The checkboxes are:
a) TX – Indicates the radio is transmitting.
b) RX – Indicates the radio is receiving.
c) SQ – Indicates the radio squelch is overridden. Radio squelch can be overridden by pushing
the volume knob.
d) LO VOLT - Indicates the radio input voltage is low. The radio will reduce TX power or
stop transmitting completely depending on the voltage level.
e) HI TEMP – Indicates the transmitter temperature is high. If transmitter temperature is high
the radio will reduce TX power until the temperature lowers.
f) TX AMPS – This is not a checkbox. This indicates how much current (in Amps) is supplied
to the transmitter. When the GTR 200 is transmitting the current draw will be approximately
3.0 Amps under ideal load conditions. When the GTR 200 is not transmitting the current
draw will be around 0.01 Amps.
4. If the LO VOLT checkbox is checked this indicates a low battery condition or wiring fault that is
preventing the radio from receiving proper voltage. Correct this condition before proceeding with
this test.
5. Select a frequency that is transmitting. An ATIS, ASOS, or other continuously transmitting
frequency is a good choice. Frequency tuning works differently in configuration mode. The
SMALL Knob changes the highlighted frequency field and the LARGE Knob moves the
highlighted field.
6. Verify the RX checkbox is checked and the received audio can be heard in the headset.
7. Select a frequency that is safe for transmission. The antenna and coaxial cable must be properly
connected to the radio before attempting to transmit.
8. Key the transmitter and verify the TX checkbox is checked while transmitting. If the checkbox
does not check there is a wiring fault. If the checkbox is always checked there is a wiring fault.
9. If the radio is tuned to a frequency that is appropriate for a radio check, one can be performed as
part of this test.
10. If the copilot position is wired for transmission repeat the test for the copilot position.
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