Key facts
- Brand
- Garmin
- Model
- GMA 340
- Category
- Other products
- Industry
- Automotive
- Documents
- 3
- Languages
- EN
- Last added
- 2023-10-26
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Garmin GMA 340 Audio Panel Pilot's Guide
This document serves as a pilot's guide for the Garmin GMA 340 Audio Panel. It details the operation of front panel controls, including function selection switches, volume controls, and audio source selection for transceivers and navigation radios. The guide explains the functionality of the Intercom System (ICS) and Marker Beacon Receiver.
Read onlineGarmin GMA 340 specifications
| TSO Compliance | TSO‑C50c, C35d, JTSO‑C50c, JTSO‑2C35d |
|---|---|
| Temperature Range | -20 °C to +55 °C |
| Weight (unit only) | 1.2 lb (0.6 kg) |
| Bezel Height | 1.30 in (33 mm) |
| Supply Voltage | 11.0 V to 33.0 VDC |
| Operating Current | 2.2 A (normal operation, 13.8 V, speaker on) |
| Altitude Capability | 50,000 ft |
| Transceiver Inputs | 3 |
| Receiver Inputs | 5 (6 in Dual ADF version) |
| Input Impedance | 500 Ω (800 Ω DME input in Dual ADF) |
| Input Isolation | ≥ 60 dB |
All Garmin GMA 340 documents by type
Mounting, wiring and first power-up. Read it before the hardware goes in.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the power supply voltage range for the GMA 340?
The GMA 340 operates from 11.0 V to 33.0 VDC.
How many transceiver audio inputs does the GMA 340 provide?
The panel has three transceiver inputs.
What happens if the unit is turned off?
A failsafe circuit connects the pilot's headset and microphone directly to COM 1.
How does the Split COM function work?
It dedicates COM 1 to the pilot and COM 2 to the copilot for MIC/audio, allowing simultaneous transmission.
How do I turn the GMA 340 on and off?
Rotate the left small knob (5) fully counter‑clockwise to power off; rotate it clockwise past the click to turn the unit on.
What does the Split COM function do?
When activated, COM1 is dedicated to the pilot and COM2 to the copilot, allowing both to transmit simultaneously on separate radios.