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Aircraft Radio Communications Receiver

2018-01-14 06:42  
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The communications between commercial aircraft and the ground can be interesting, amusing and sometimes even disturbing. However radios that receive the approximately 220MHz to 400MHz band commonly used for aircraft (both military and commercial) are not easily found. And scanners can be complicated, large and expensive. With an easy to build circuit such as this one, everyone can enjoy listening in on these conversations.



Schematic of the aircraft receiver circuit



Total Qty.
R1, R3247K 1/4W Resistor 
R2110K 1/4W Resistor 
R414.7K 1/4W Resistor 
R515K Linear Taper Pot 
R612.2K 1/4W Resistor 
C1, C2, C3, C640.001uF Ceramic Disc Capacitor 
C412.2pF Ceramic Disc Capacitor 
C511pF Ceramic Disc Capacitor 
C7115uF 15V Electrolytic Capacitor 
C8118pF Variable Capacitor 
D111N82 Diode 
Q112N918 NPN Transistor 
L11See Notes 
L211.8uH Inductor 
ANT11Approx. 18 Inch Wire Antenna 
MISC1PC Board, Wire, Knob For C8 



The circuit originally appeared in theThink Tankcolumn of the Sept. 1995 issue ofPopular Electronics.L1 is made by winding 2 turns of 22 AWG magnet wire on a 5/32 drill bit. This inductor can be modified to shift the frequency range of the circuit.The antenna can also be placed at the anode of D1 if overload is a problem with it connected to the emitter of Q1R5 adjusts regen and thus sensitivity.


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