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Thirteen: Aircraft Band Receivers
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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
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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
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The passive air-band receiver can be constructed on a regular circuit board or it could be built on a
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Thirteen: Aircraft Band Receivers
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Figure 13-4 Passive aircraft receiver schematic quick-board which contains ready-made circuit traces, these are available at Radio Shack stores You may want to lay out the circuit so that the tuning control is at one edge of the board, which will make things a little easier when installing the circuit in an enclosure Building the circuit is pretty straightforward and should only take a few hours to build Refer to Table 13-1 for identifying the resistors and Table 13-2 for identifying the small capacitors in the circuit Remember it is very important to install the diode correctly with respect to its polarity in order for the circuit to work properly The passive air-band receiver also contains a few electrolytic capacitors, and you will remember that these devices have polarity and it must be observed for the circuit to work The aircraft receiver uses a dual op-amp to amplify the signals and you will have to ensure that it is installed correctly An integrated circuit is highly recommended for the op-amp In the event of a circuit failure at some later date, it is much easier to simply unplug an IC rather than trying to unsolder one from a PC board to replace it with a new one When installing the IC into its socket, you will have to make sure that you orient it correctly An IC will typically have a notch or small cut-out at one end of the IC case Pin one (1) will be to the left of the cut-out of notch when viewed from the top of the IC In this project pin 1 of the IC connects to potentiometer R3, while pin 8 of the IC is connected to the power source Note that pin 4 of the IC is connected to the circuit ground You can elect to use a small speaker in this circuit, but in order to make a miniature receiver you may want to simply use a small 1 8 mini jack and just plug into a pair of small earphones The circuit is powered from a standard 9 volt battery; remember the black or minus ( ) battery clip is connected to ground, while the plus (+) or red battery clip lead is connected to capacitor C5 at the plus (+) end You will want to have the tuning capacitor C2 near the edge of the circuit board, so that you can allow the tuning knob to protrude through the case so you can easily tune the receiver Once the receiver has been completed, you should take a few minutes rest After the break, you should inspect the foil side of the circuit board for any cold solder joints Cold solder joints often look dark, dull or blobby If you see any solder joints that look this way, you should resolder the connections You should also take a moment to examine the circuit board for any short-circuits which may be the result of a stray component lead shorting between circuit traces You can make yourself an antenna from a piece of stiff 20 ga wire as a whip antenna to capacitor C1, or install a miniature jack in order to plug in a
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