Garmin GNS 480 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Installation Procedures2-38 560-0982-01 Rev A GNS 480 (CNX80) Installation Manual2.8.12.1 Com Headphone and Speaker Audio OutP4-14 Com Headphone OutP4-6 Com Speaker OutP4-13 Com Audio GroundThe Com Headphone Out is a low-level audio output that is intended to drive a headset or audio panel.This output will provide 280 mW into a 100 Ω load, or 120 mW into a 500 Ω load.The Com Speaker Out is a high-level audio output that is available to drive a speaker. This output willprovide 12 watts into a 4 Ω load, or 8 watts into an 8 Ω load.Both the Headphone and Speaker outputs use the same Com Audio Ground. For normal installations, itis recommended that the Headphone output be used, and the Com Speaker output be left unconnected.2.8.12.2 Com MIC Audio InP4-8 Com MIC In HighP4-7 Com MIC In LowThe Com MIC input is designed for a standard carbon or dynamic mic with integrated pre-amp providingminimum 70 mv rms into 1000 Ω load. The GNS 480 provides a bias voltage to the microphone.2.8.12.3 Push to Talk (PTT)P4-4 PTTThe PTT is used to enable the Com MIC audio and cause the Com transceiver to transmit on the activefrequency. Refer to section 2.8.9.4 for additional details.2.8.12.4 Com Flip-Flop SwitchP1-14 Com Flip Flop InThe Com Flip-Flop In can be used to toggle the active and standby Com frequencies. Refer to section2.8.9.2 for additional details.2.8.12.5 Com User List SwitchP1-15 UP Discrete InP1-33 DOWN Discrete InThe Com User List inputs can be used to display the Com User List and select a frequency. Refer tosection 2.8.9.5 for additional details.2.8.13 VHF NAVThe GNS 480 provides an internal NAV receiver that can be interfaced to an audio panel. An optionalexternal input is also available to allow the user to toggle the active and standby Nav frequencies.Refer to Appendix D for interconnect information.