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Aircraft Band Receiver

Modify an ordinary analog AM/FM radio to eavesdrop on air traffic control communications. All you need is a screwdriver -- can't be easier than that!

Aircraft Band Receiver

The FM radio band (88-108 MHz) lies just below the Civil Aviation Band (108-138 MHz), which is used for air traffic control, air shows, and other ground-to-air communications. This means that it’s easy to modify an ordinary analog AM/FM radio to receive these transmissions.

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Steps

Step #1: Get Yourself an Analog Portable Radio

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Aircraft Band Receiver
  • Pick an older style AM/FM radio with a traditional tuning dial, not one with a synthesized tuner.
  • For our project here we're using the venerable RadioShack AM/FM Pocket Radio. (As of 11/9/12 the RadioShack Pocket Radio no longer uses analog tuning, It has the tradional dial, but now uses digital tuning. The copper loops referenced in the rest of the project no longer apply.)

Step #2: Remove the Back Panel

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Aircraft Band Receiver
  • Remove the screws from the back of your radio and gently pry open the casing.
  • Case screws to consumer electronics can frequently be found inside of the battery compartment, so make sure to look there if your case isn't coming apart when you think you've removed all of the screws.

Step #3: Locate the Coils

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Aircraft Band Receiver
  • Identify the three copper-colored coils (circled here in red) and the two tuning transformers (shown in the blue boxes).
  • FYI: That clear plastic box to the left of the coils is the radio's tuning capacitor. Move the dial around on the front of the radio and you'll see its parts move inside the clear case.

Step #4: Adjust the coils

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Aircraft Band Receiver
  • Switch the radio on and set it to FM reception. Tune to a station high on the dial, as close as you can to 108 MHz.
  • Using a flat screwdriver, slowly expand the coil windings on all three coils.
  • You should notice the tuned radio station is moving slowly down the dial. This is good, as we are expanding the reception range of the radio in the band above 108 MHz.

Step #5: Test it Out

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Aircraft Band Receiver
  • Retune the radio and check that the original station is still available, but lower down on the dial.
  • In the picture you can see that the station around 108 MHz has now moved down to the location marked 101 MHz on the dial.
  • The final step is to turn the radio dial in-between stations, so that all you hear is hiss. Now adjust the tuning transformers so that this hiss is at the loudest possible level.
  • Congratulations! The modifications are complete. Put the case back on and let's pay a visit to the local airport to try it out.
  • Get as close to the tower as you can, and tune the dial in the new extended region you just created. When planes are in the area, you should be able to pick up their communications!

Steve Hobley

This week, I have been mostly working on...

I've been tinkering around with bits of technology since I was five years old. I used to take the telephone apart at home, just to see how it worked.

After a couple of years I could even put it back together again - and sometimes it would continue to work.


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