GTX 345 - Uncategorized GARMIN - Free user manual and instructions
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| Product Type | Aviation Transponder (ADS-B Out/In) |
| Dimensions (W x H x D) | 160 x 30 x 215 mm (6.25 x 1.2 x 8.5 in) |
| Weight | 0.54 kg (1.2 lbs) |
| Power Input | 11-33 V DC, 15 W max |
| Frequency | 1090 MHz (Mode S), 978 MHz (UAT) |
| Transmission Power | 250 W nominal (1090 MHz) |
| ADS-B Out | Yes (DO-260B compliant) |
| ADS-B In | Yes (Traffic and Weather) |
| Altitude Encoder | Integrated (up to 50,000 ft) |
| GPS Input | Supports external GPS (RS-232) |
| Maintenance | No user serviceable parts; periodic inspection recommended |
| Cleaning | Wipe with a dry, soft cloth; avoid solvents |
| Safety Certifications | FAA TSO-C166b, TSO-C154c, TSO-C112e |
| Spare Parts | Antenna, mounting rack, connectors, data cable |
| Reparability | Factory service only; no field repairs |
| General Info | Manufacturer: Garmin; Model: GTX 345; Part Number: 010-00821-50 |
Frequently Asked Questions - GTX 345 GARMIN
What is the Garmin GTX 345?
The Garmin GTX 345 is an ADS-B transponder that provides both ADS-B Out (to comply with FAA mandates) and ADS-B In (for traffic and weather).
Does the GTX 345 require a dedicated GPS?
It can use an internal GPS (optional) or be paired with an external GPS source via RS-232 for position data.
Can the GTX 345 be installed in any aircraft?
The GTX 345 is designed for general aviation aircraft and requires avionics shop installation for proper wiring and certification.
What is the altitude limitation of the GTX 345?
The built-in altitude encoder supports up to 50,000 feet, suitable for most general aviation aircraft.
How do I update the GTX 345 software?
Updates are performed using a Garmin SD card or through the Garmin Aviation Database service. Full instructions are in the manual.
What antennas are required?
Typically one 1090 MHz antenna and optionally a 978 MHz UAT antenna for ADS-B In. Garmin recommends specific antennas (e.g., GA 35, GA 36).
Is the GTX 345 certified for IFR?
Yes, it is certified under TSO-C166b for IFR and VFR operations with ADS-B Out.
Does the GTX 345 display weather on my GPS?
Yes, it broadcasts FIS-B weather (METARs, TAFs, radar) to compatible displays via the ADS-B In function.
What is the power consumption at 28 V?
Approximately 15 watts (0.5 A) during normal operation at 28 V DC.
Can I install a used GTX 345?
Yes, but the unit may require a fresh conformity check and FAA Form 8130-3 for certification. Consult an avionics shop.
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