barcode generator c# code Thirteen: Aircraft Band Receivers in Software

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Thirteen: Aircraft Band Receivers
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Fast talking pilot and controllers
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Aviation communication is brief, but it is clear and full of meaning Usually, pilots repeat back exactly what they hear from a controller so that both know that the message or instructions were correctly interpreted If you are listening in, it is hard to track everything said from a cockpit, particularly in big city areas Just to taxi, take off and fly a few miles, a pilot may talk with six or eight different air traffic control operations, all on different frequencies, all within a few minutes! Here are the meanings of a few typical communications:
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United 330, traffic at 9 o clock, 4 miles, altitude unknown
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The controller alerts United Airlines flight #330 of radar contact with some other aircraft off to the pilot s left at a 9 o clock position Since the unknown plane s altitude is also unknown, both controller and pilot realize that it is a smaller private plane not equipped with altitude-reporting equipment
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Active receiver circuit description
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Now, take a look at the schematic diagram shown in Figure 13-2 The aircraft band antenna is first coupled through C1 to a three-section tuned LC filter input network The aircraft band signals ranging from 118 to 135 MHz signals are amplified by VHF transistor Q1 and fed to the input of U1, the SA602 mixer-oscillator Inductor L6 and its associated capacitor network establish the LO (local oscillator) frequency at 107 MHz higher than the incoming 118 135 MHz signals The local oscillator frequency may be tuned across about 15 MHz by the varactor tuning network formed by diode D1 and resistor R1 The 107 MHz difference between the local oscillator and the received signal is fed through the 107 MHz ceramic filter FL1, and then amplified by Q2 and the signal is then applied to U2, the MC1350 IF amplifier IC with AGC input The 107 MHz IF is peaked by inductor L7, and the AM audio signal is then demodulated by diode D2 and fed through the four op-amps of U3, the LM324, where volume control, AGC output, audio filtering and squelch functions are managed The LM386 (U4) is the audio amplifier, and is capable of driving simple communications speakers to excellent volume levels
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Miami center, delta 545 heavy out of three-zero for two-five
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Delta Flight 545 acknowledges Miami Center s clearance to descend from 30,000 feet to 25,000 feet altitude The word heavy means that the plane is a jumbo jet such as 747, DC-10, etc
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Seneca 432 lima cleared to outer marker contact Tower 1187
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The local Approach Control is saying that the Piper Seneca with the N-number (tail number) ending in 432L is cleared to continue flying an instrument approach to the outer marker (a precision radio beacon located near the airport) and should immediately call the airport radio control tower at 1187 MHz This message also implies that the controller does not expect to talk again with that aircraft
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A controller is telling the Cessna pilot to set the airplane s radar transponder to code 6750, climb to and fly level at an altitude of 5000 feet
Circuit construction
The aircraft band receiver is best constructed on a printed circuit board for best results Place your schematic diagram in front of you, heat up your 27 to 30 watt pencil tipped soldering iron and prepare to insert
Thirteen: Aircraft Band Receivers
C10 R5 R4 Q1 C8 1 R6 2 C6 C9 3 6 7 C19 C11 L5 L4 C5 C14 C3 L2 C2 A C1 L1 J1 6 +5 J2 C29 C28 7 U4 4 3 + 2 R27 R24 R3 R2 R13 C25 Ground R20 C26 + R23 C27 +9 V C15 L3 K D1 +9 V + U3c 10 R119 9 D3 14 +9 V R14 + U3d 13 12 1 R9 R1 R22 C21 R21 + 4 R18 2 R15 + C22 7 5 + U3b 6 8 +9 V C24 R16 R17 C4 L6 +9 V C13 C12 C20 R25 C30 C23 R8 T1 R12 + 8 4 U1 1 2 3 Q2 FL-1 R10 C16 4 3 7 6 U2 5 2 1 8 R26 D2 C17 + B1 C7 R7 R11 R28 C31 C18 + S1 +
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