- In response to the
article on the photo
showing odd shapes on the bottom of the airliner that struck the South
Tower, an Avionics expert has a RC lesson for Popular Mechanics and
all of us.
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- Excerpts from his emails:
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- I have 35 years experience in this area of Avionics
on numerous military and commercial
- aircraft.
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- I took the first digital avionic system aircraft to
the field in 1969 and have worked on numerous military aircraft, and
studied the architecture on just about all commercial air-carriers
over the last 30 some years.
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- Instrumentation packages added to aircraft to
augment control or take over automatic flight control are old
hat.
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- The package shown on your photo is evidently a
receiver and the associated electronics required to replace the AFCS
package (Auto Pilot and Stability Control Unit).
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- The two blade antenna (CIRCLED IN YELLOW) are not
normal (Their reflections makes it looks like a last minute add on.)
for this type plane. They are VHF (too large for UHF) antennas used to
control the replacement autopilot package.
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- This looks like a remote control package on this
aircraft. What you are looking at is not the normal configuration of a
commercial aircraft.
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- FROM:
http://www.dtccom.com/uav-uvg-and-robots.html
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- In UAV applications, signal bounce off the earth or
buildings may induce fading, causing signal breakup. DTC is reknowned
for its line of true diversity receivers, using spatial diversity to
overcome fades and multipath. Pairs of receivers and antennas tuned to
the same frequency are used to receive a single transmitted signal. A
proprietary voting logic board votes to the best signal during the
horizontal retrace, over 15,000 times per second. This greatly
enhances video quality.
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- DTC's miniature microwave video transmitters
<video-transmitter-250mw.html> and receivers are well suited for
UAV downlinks, transmitting one channel of video and up to two
telemetry channels over audio subcarriers
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- THE PREDATOR is state-of-the-art UAV
technology.
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- From:
http://science.howstuffworks.com/predator2.htm
- Blade antennas as on the South Tower airliner are
circled in yellow. More antennas are located inside the front of the
aircraft circled in red.
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