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Passive Aircraft Receiver
Passive Aircraft Receiver
Published at: 1/23/2013
Published at: 1/23/2013
Category:
Category:
The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to
The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to
receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or
receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or
other RF circuitry capable of interfering with aircraft communications so it should be
other RF circuitry capable of interfering with aircraft communications so it should be
fine inside the cabin of the aircraft.
fine inside the cabin of the aircraft.
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Nevertheless, check the regulations before using this receiver on a commercial
Nevertheless, check the regulations before using this receiver on a commercial
airliner. New security regulations probably prohibit this device on commercial
airliner. New security regulations probably prohibit this device on commercial
flights. Do not expect to hear two-way aircraft transmissions with this receiver! It is
flights. Do not expect to hear two-way aircraft transmissions with this receiver! It is
a short-range receiver only.
a short-range receiver only.
The detector diode is a 1N5711, HP2835 or similar Schottky detector diode. The 10
The detector diode is a 1N5711, HP2835 or similar Schottky detector diode. The 10
megohm resistors provide a small diode bias current for better detector efficiency.
megohm resistors provide a small diode bias current for better detector efficiency.
The tuning capacitor may be any small variable with a range from about 5 pF to
The tuning capacitor may be any small variable with a range from about 5 pF to
about 15 or 20 pF. The 0.15 uH inductor may be a molded choke or a few turns
about 15 or 20 pF. The 0.15 uH inductor may be a molded choke or a few turns
wound with a small diameter.
wound with a small diameter.
Experiment with the coil to get the desired tuning range. The aircraft frequencies
Experiment with the coil to get the desired tuning range. The aircraft frequencies
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are directly above the FM band so a proper inductor will tune FM stations with the
are directly above the FM band so a proper inductor will tune FM stations with the
capacitor set near maximum capacity. (The FM stations will sound distorted since
capacitor set near maximum capacity. (The FM stations will sound distorted since
they are being slope detected.) Other capacitor and inductor combinations may be
they are being slope detected.) Other capacitor and inductor combinations may be
selected to tune other bands if desired. (Try the CB band at 27 MHz.)
selected to tune other bands if desired. (Try the CB band at 27 MHz.)
The LM358 dual op-amp draws under 1 ma so the battery life is quite long. A speaker
The LM358 dual op-amp draws under 1 ma so the battery life is quite long. A speaker
amplifier may be added to drive a speaker or low-z earphone. The antenna can be a
amplifier may be added to drive a speaker or low-z earphone. The antenna can be a
couple of inches if the receiver is near the transmitter or a couple of feet for
couple of inches if the receiver is near the transmitter or a couple of feet for
maximum range. The selectivity is reduce as the antenna length is increased so best
maximum range. The selectivity is reduce as the antenna length is increased so best
performance is achieved with the shortest acceptable antenna. Try increasing the 1.8
performance is achieved with the shortest acceptable antenna. Try increasing the 1.8
pF capacitor value when using very short antennas and decreasing it for long
pF capacitor value when using very short antennas and decreasing it for long
antennas. The receiver could be built into a small plastic box with a short antenna
antennas. The receiver could be built into a small plastic box with a short antenna
inside.
inside.
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