TECHNISONIC A711L Series
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Transcript TECHNISONIC A711L Series
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.
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.
TECHNISONIC
Coming soon, the ARTS-100 system.
genuine “wahoo” test moment.
http://til.ca short and sweet.
[email protected] any time for audio
questions.
Available from Dallas Avionics.
A
TECHNISONIC
GET TRAINED! Saturday at
1:30pm
Prizes for correct answers!
See us at BOOTH 103 / 801
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.
Types of Noise
In-band audio frequency noise.
Cross-talk
Signal contamination
Inverter/Generator Contamination
Types of Noise
Out-of-Band RF Sources:
AM Comms
HF/SSB
FM Comms
RF Problems
Ship Issues can be multi-modal:
Radio to Radio Interference
Harmonic
Direct
Radio to Audio line rectification
Antenna Induced Standing Waves
Mechanical-RF
The Main Rotor will modulate
outgoing transmissions, and
incoming reception, and change
reflected power.
Antenna PLACEMENT is
everything to fix this.
Antenna Issues
Bottom Mounts work best for AM
Comms on helicopters.
Spacing & Proximity
There’s rarely enough room in
general aviation aircraft...
10 kg in a 5 kg box
Sometimes it’s just not that easy…
Audio Wiring
Wiring topology and routing has a
large bearing on audio system
performance.
No amount of shielding can
overcome design limits.
Audio Wiring
Access/A (floating ground)
technology can provide a 20-30dB
improvement in noise and crosstalk over even high end grounded
systems.
That is 100-1000 times better.
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.
Ground Loops
How we wish aircraft worked:
Ground Loops
What really happens:
Ground Loops
The “frame ground” is alive with
voltages caused by different loads.
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.
Ground Loops
Ground currents also inject
CROSS-TALK, as every audio line
returned though ground becomes
mixed with every other audio
signal.
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.
Ground Topology
Floating Topology