What should I do if my Garmin GTR 225 displays 'COM RADIO - COM radio needs service'?
This message means that the COM radio is reporting that it needs service. Cycle the power to the COM radio. Contact dealer for service.
What to do if Garmin GTR 225 Transceiver does not transmit?
If your Garmin GTR 225 Transceiver isn't transmitting, start by checking the power connections to ensure the COM has power. Also, verify the mic key input connection is properly connected.
What to do if I can't change active frequency on my Garmin GPS?
If you can't change the active frequency on your Garmin GPS, it might be in lockout mode, tuning to 121.50. To fix this, press the external Com FLIP/FLOP key for two seconds to return to normal operation, or cycle the avionics power. If the problem continues, contact your dealer.
What to do if Garmin GPS GTR 225 does not transmit?
If your Garmin GTR 225 GPS does not transmit, check the power connections to the Com and the Mic key input connection.
Why is the intercom not working on my Garmin GPS?
If the intercom on your Garmin GPS isn’t functioning, first check the connections. The intercom might be disabled via a remote-mounted switch or through the menu. Also, if there's no voice activation, or if you must speak too loudly, check the ICS page for Intercom On/Off settings and adjust the intercom settings.
How to troubleshoot a Garmin GTR 225 Transceiver that does not power on?
If your Garmin GTR 225 Transceiver does not power on, there are a couple of things you can check: * First, ensure that there is power reaching the unit by checking the power connections, breakers, and the main avionics switch. * Also, a faulty electrical wiring or connection may be the reason. In this case, it is best to contact your dealer to perform an electrical system test.
What to do if Garmin GTR 225 Transceiver displays 'DISPLAY - Display board needs service'?
This message indicates that the display board needs service. Contact dealer for service.
What does it mean when my Garmin Transceiver displays 'POWER ALERT - Unit will shut down if power switch is not restored immediately'?
This message indicates that power has been removed from the unit. Re-apply power to the unit.
What does 'FEATURE UNLOCK FAILURE' mean on my Garmin GTR 225?
This message indicates that the database on the USB flash drive is corrupt, or the system ID in the database does not match the unit’s system ID. Verify that the correct system ID is entered into flyGarmin.com when downloading the database. Contact Garmin Customer Support if this message persists.
Why does my Garmin GTR 225 Transceiver show 'COM RADIO - COM overtemp or undervoltage. Reducing transmitter power'?
This message indicates that the COM radio is in overtemp or undervoltage mode, and transmitting power has been reduced to prevent damage. To address this, decrease the length of COM transmissions, lower the cabin temperature, and increase cabin airflow, especially near the GTR. Also, check the aircraft voltage and reduce electrical load as necessary. Contact dealer for service if this message persists.
Overview of manual scope, intended audience, and installation practices.
Details GTR 225/GNC 255 series units and TSO certifications.
Physical/display specs, operating ranges, environmental testing.
Transmitter/receiver specs for COM functions, including frequency and power.
Receiver specs for VOR navigation, including sensitivity, accuracy, and output.
Receiver specs for LOC navigation, including sensitivity, accuracy, and output.
Receiver specs for Glideslope navigation, including sensitivity, accuracy, and output.
Electrical current draw requirements for GTR/GNC units under various conditions.
FCC licensing requirements and cautions regarding equipment modifications.
TSO authorizations, advisory circular references, and system functions.
Information on the frequency database, updates, and reporting discrepancies.
Details of product warranty, exclusions, and service procedures.
Minimum performance standards for TSO approval and aircraft installation requirements.
Aircraft radio station license requirements and safety objectives for VHF COM radio.
Guidance on following acceptable avionics installation practices per AC 43.13.
Guidelines for mounting COM/NAV antennas, including location, spacing, and GPS interference.
Recommendations for mounting unit in aircraft panel for optimal pilot access and visibility.
Best practices for wiring installation, including separation, protection, and wire gauge.
Information on unit's integrated cooling fan and ensuring proper airflow through chassis.
Requirements for recalibrating compass if unit is mounted within twelve inches.
Catalog part numbers and standard kit accessories for GTR/GNC units.
Information on optional accessories like notch filters and specific connectors.
List of related manuals and guides for installation and operation.
List of necessary accessories and materials not included with unit for installation.
Recommended crimp tools and insertion/extraction tools for connector contacts.
Steps for routing and installing coaxial cables, including connector attachment and trimming.
Procedures for installing unit's mounting rack and securing the unit into the rack.
Guidelines for installing COM antenna, including mounting location and VSWR checks.
Detailed list of pin functions for J2001 COM board and J2002 NAV board connectors.
Details on power input, lighting bus connections, and antenna interfaces for COM/NAV units.
Overview of checkout and configuration steps for the GTR/GNC installation.
Procedures for verifying mounting, wiring harness, and power connections before unit installation.
Steps to ensure proper unit connector engagement in rack and secure retention mechanism.
How to access and navigate configuration modes for system setup (SYS, NAV, COM, AUD).
Procedures for ground checks of system interfaces like resolvers and flags in config mode.
Procedures for ground checks of interfaces (discrete inputs, VHF COM/NAV) in normal mode.
Recommended flight checks for satisfactory performance of COM, VOR, and ILS functions.
Instructions for loading software updates and databases onto GTR/GNC via USB drive.
Details on RS-232 interface and general aviation output data formats (Type 1/Type 2 sentences).
Details on RS-232 NMEA data format, including interface, message structure, and output rates.
List of mechanical drawings for unit dimensions, mounting rack, and panel cutout details.
List of interconnect diagrams illustrating system interfaces and wiring connections.
General| Input Voltage | 11-33 VDC |
|---|---|
| Operating Voltage | 11-33 VDC |
| Operating Temperature | -20°C to +55°C |
| Frequency Range | 118.000 MHz to 136.975 MHz |
| Channel Spacing | 25 kHz |
| Transmit Power | 10 W |
| Current Consumption | 1.5 A (max transmit) |
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