Tuesday, January 11, 2011

AIR CRAFT RADIO COMMUNICATION RECEIVER

Introduction:-
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.

Circuit diagram:-



click on the picture for better quality................

Parts:-

Part
Total Qty.
Description
Substitutions
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


Notes:-

  1. 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.
  2. The antenna can also be placed at the anode of D1 if overload is a problem with it connected to the emitter ofQ1
  3. R5 adjusts regen and thus sensitivity.

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