TECHNISONIC A711L Series
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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 series
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Cosmetic Options.
NVG + flexible light.
Powersonix PA
capability.
Nifty PA options.
Latent features.
Ideal mate to the
TDFM-7300.
Address integrated
NAV/COM packages.
TECHNISONIC
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Coming soon, the ARTS-100 system.
genuine “wahoo” test moment.
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http://til.ca short and sweet.
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Walter2@til.ca any time for audio
questions.
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Available from Dallas Avionics.
A
TECHNISONIC
GET TRAINED! Saturday at
1:30pm
 Prizes for correct answers!
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See us at BOOTH 103 / 801
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Thank you!
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.
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Types of Noise
In-band audio frequency noise.
 Cross-talk
 Signal contamination
 Inverter/Generator Contamination
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Types of Noise
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Out-of-Band RF Sources:
 AM Comms
 HF/SSB
 FM Comms
RF Problems
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Ship Issues can be multi-modal:
 Radio to Radio Interference
 Harmonic
 Direct
 Radio to Audio line rectification
 Antenna Induced Standing Waves
Mechanical-RF
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The Main Rotor will modulate
outgoing transmissions, and
incoming reception, and change
reflected power.
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Antenna PLACEMENT is
everything to fix this.
Antenna Issues
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Bottom Mounts work best for AM
Comms on helicopters.
Spacing & Proximity
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There’s rarely enough room in
general aviation aircraft...
10 kg in a 5 kg box
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Sometimes it’s just not that easy…
Audio Wiring
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Wiring topology and routing has a
large bearing on audio system
performance.
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No amount of shielding can
overcome design limits.
Audio Wiring
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Access/A (floating ground)
technology can provide a 20-30dB
improvement in noise and crosstalk over even high end grounded
systems.
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That is 100-1000 times better.
Audio Wiring
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Grounded audio returns are highly
subject to GROUND LOOP noise.
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This style interconnect was an
early method of saving weight,
complexity and wire, but offers the
worst possible performance.
Ground Loops
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How we wish aircraft worked:
Ground Loops
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What really happens:
Ground Loops
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The “frame ground” is alive with
voltages caused by different loads.
Ground Loops
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Attaching audio returns to ground
contaminates the audio signal
with every load current flowing
through the airframe.
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These induced voltages can be
VERY large, and are a real problem
especially for low level audio
lines like microphones.
Ground Loops
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Ground currents also inject
CROSS-TALK, as every audio line
returned though ground becomes
mixed with every other audio
signal.
Ground Loops
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The answer is to LIFT audio lines
from the airframe ground, and
process them as floating signals.
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This improves both noise and
cross-talk significantly.
Ground Topology
Floating Topology