TECHNISONIC A711L SeriesTECHNISONIC 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.

TECHNISONIC A711L seriesTECHNISONIC 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.

TECHNISONICTECHNISONIC

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.

TECHNISONICTECHNISONIC

GET TRAINED! Saturday at 1:30pm

Prizes for correct answers!

See us at BOOTH 103 / 801

Thank you!

Noise is the Noise is the EnemyEnemy

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.

Types of NoiseTypes of Noise

In-band audio frequency noise.Cross-talk

Signal contaminationInverter/Generator Contamination

Types of NoiseTypes of Noise

Out-of-Band RF Sources:AM Comms

HF/SSBFM Comms

RF ProblemsRF Problems

Ship Issues can be multi-modal:Radio to Radio Interference

HarmonicDirect

Radio to Audio line rectificationAntenna Induced Standing Waves

Mechanical-RFMechanical-RF

The Main Rotor will modulate outgoing transmissions, and incoming reception, and change reflected power.

Antenna PLACEMENT is everything to fix this.

Antenna IssuesAntenna Issues

Bottom Mounts work best for AM Comms on helicopters.

Spacing & ProximitySpacing & Proximity

There’s rarely enough room in general aviation aircraft...

10 kg in a 10 kg in a 5 kg5 kg box box

Sometimes it’s just not that easy…

Audio WiringAudio Wiring

Wiring topology and routing has a large bearing on audio system performance.

No amount of shielding can overcome design limits.

Audio WiringAudio 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.

Audio WiringAudio 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.

Ground LoopsGround Loops

How we wish aircraft worked:

Ground LoopsGround Loops

What really happens:

Ground LoopsGround Loops

The “frame ground” is alive with voltages caused by different loads.

Ground LoopsGround 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.

Ground LoopsGround Loops

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

Ground LoopsGround 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.

Ground TopologyGround Topology

Floating TopologyFloating Topology