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the control tower The passive aircraft receiver is shown in Figure 13-4 The passive aircraft receiver can be built small enough to place inside your vest pocket and it operates from an ordinary 9 volt battery The passive aircraft receiver is basically an amplified type of crystal radio designed to receive AM aircraft transmissions The passive design uses no oscillators or other RF circuitry capable of interfering with aircraft communications This receiver utilizes a coil/capacitor tuned front-end, which feeds an RF signal to a detector diode The tuning capacitor may be any small variable with a range from about 5 pF to about 15 or 20 pF The 015 H inductor may be a molded choke or a few turns wound with a small diameter Experiment with the coil to get the desired tuning range The aircraft frequencies 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 they are being slope detected) A 1N34 germanium detector diode or a Schottky diode like the 1N5711 or HP2835 should be used as the detector diode in this receiver circuit The 10 megohm resistors provide a small diode bias current for better detector efficiency The LM358 dual op-amp amplifier draws under 1 ma so the battery life should be quite long Potentiometer R3 is used to adjust the gain to the second stage of the dual op-amp The second op-amp stage drives a 100 ohm resistor in series with a 100 F capacitor You must use a high impedance crystal headphone, since the op-amp output will not drive a speaker directly A speaker amplifier may be added to drive a speaker or low-z earphone, if desired, but the power consumption will increase sharply, as will the size of the receiver The passive aircraft receiver is powered from an ordinary 9 volt transistor radio battery The entire aircraft band receiver can be built inside a small plastic box Simply mount an SPST slide switch on the side of the case to apply power to the circuit If you elect, you can install a 1 8 phone jack for the crystal headphone.

A search on the Internet or contacting the appropriate professional associations listed in Appendix A will lead you to hundreds of engineering

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While driving around the countryside you may have come across a tall white cone structure near your airport or in the middle of a big farming field; it is useful for you to know that these are VHF navigational aids operating in the 118 135 MHz frequency range, just below the airground communications range, sending a steady signal which may be helpful in initial alignment If you tune in such a signal on your receiver, remember that you will have to increase the local oscillator frequency later in order to listen to air traffic communications

The passive air-band receiver is a type of crystal radio which contains no local oscillator which might interferes with the on-board aircraft s sensitive electronics The passive aircraft receiver broadly tunes from 118 MHz to 136 MHz, and was designed to listenin to in-flight communications between your pilot and

programs Featured below is a composite program, included to give you an idea of what to expect at the college or university of your choice As mentioned earlier, programs differ in their emphasis, so investigate each school before making a decision

The passive air-band receiver can be constructed on a regular circuit board or it could be built on a

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