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TECHNISONIC A711L Series

TECHNISONIC A711L Series. 3 rd Generation Advanced Analog audio. Full fail-passive capability. 7 Radios + PA, with 1-button transfer. Tactile, lighted controls. Cleaner layout. Tone alerting. Plug compatible. TECHNISONIC A711L series. Cosmetic Options. NVG + flexible light.

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TECHNISONIC A711L Series

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  1. TECHNISONIC A711L Series • 3rd Generation Advanced Analog audio. • Full fail-passive capability. • 7 Radios + PA, with 1-button transfer. • Tactile, lighted controls. • Cleaner layout. • Tone alerting. • Plug compatible.

  2. TECHNISONIC A711L series • Cosmetic Options. • NVG + flexible light. • Powersonix PA capability. • Nifty PA options. • Latent features. • Ideal mate to the TDFM-7300. • Address integrated NAV/COM packages.

  3. TECHNISONIC • Coming soon, the ARTS-100 system. A genuine “wahoo” test moment. • http://til.ca short and sweet. • Walter2@til.ca any time for audio questions. • Available from Dallas Avionics.

  4. TECHNISONIC • GET TRAINED! Saturday at 1:30pm • Prizes for correct answers! • See us at BOOTH 103 / 801 • Thank you!

  5. Noise is the Enemy • Installation costs and time are momentary… • But a bad install is forever. • Take the time to get everything as right as possible. • Understanding noise origins is critical.

  6. Types of Noise • In-band audio frequency noise. • Cross-talk • Signal contamination • Inverter/Generator Contamination

  7. Types of Noise • Out-of-Band RF Sources: • AM Comms • HF/SSB • FM Comms

  8. RF Problems • Ship Issues can be multi-modal: • Radio to Radio Interference • Harmonic • Direct • Radio to Audio line rectification • Antenna Induced Standing Waves

  9. Mechanical-RF • The Main Rotor will modulate outgoing transmissions, and incoming reception, and change reflected power. • Antenna PLACEMENT is everything to fix this.

  10. Antenna Issues • Bottom Mounts work best for AM Comms on helicopters.

  11. Spacing & Proximity • There’s rarely enough room in general aviation aircraft...

  12. 10 kg in a 5 kg box • Sometimes it’s just not that easy…

  13. Audio Wiring • Wiring topology and routing has a large bearing on audio system performance. • No amount of shielding can overcome design limits.

  14. Audio Wiring • Access/A (floating ground) technology can provide a 20-30dB improvement in noise and cross-talk over even high end grounded systems. • That is 100-1000 times better.

  15. Audio Wiring • Grounded audio returns are highly subject to GROUND LOOP noise. • This style interconnect was an early method of saving weight, complexity and wire, but offers the worst possible performance.

  16. Ground Loops • How we wish aircraft worked:

  17. Ground Loops • What really happens:

  18. Ground Loops • The “frame ground” is alive with voltages caused by different loads.

  19. Ground Loops • Attaching audio returns to ground contaminates the audio signal with every load current flowing through the airframe. • These induced voltages can be VERY large, and are a real problem especially for low level audio lines like microphones.

  20. Ground Loops • Ground currents also inject CROSS-TALK, as every audio line returned though ground becomes mixed with every other audio signal.

  21. Ground Loops • The answer is to LIFT audio lines from the airframe ground, and process them as floating signals. • This improves both noise and cross-talk significantly.

  22. Ground Topology

  23. Floating Topology

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