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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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long, often arduous, way just to get behind the wheel This doesn t include the weekend warriors who pilot their own wheels through sports car club races just for the joy of it Adam McMurtrie of Pottstown, Pennsylvania, borrowed his father s red Chevrolet one sunny afternoon and carved a circular dirt track from six acres of lawn around his parents home His father, a racer himself, punished his son not for taking the car or killing the grass, but for failing to wear a helmet Adam was eleven years old Now, some sixteen years later, Adam McMurtrie is still racing only with more legitimate sanctions His father, Charlie, now retired from racing, directs his son s career The younger McMurtrie drives in Indy-style Formula Atlantic races all over the East, on the same tracks that brought fame to Mario Andretti, Roger Penske, and others (Formula Atlantic cars are similar to Indy cars but one-third smaller) Of fourteen Formula Atlantic events in which Adam competed in one year, he won or finished second or third in six He won the first Formula Atlantic race he ever ran, beating veteran drivers on a rain-slick Pocono International Raceway Charlie McMurtrie operates an outlet business in Reading, Pennsylvania, and father and son jointly own two auto detailing shops and a car wash These enterprises pay the racing freight, a costly proposition Adam followed in his father s racing tracks Winning a dirtbike race at age ten was his first adventure on wheels, but he had watched his dad race everything from snowmobiles to formula cars, and he feels racing is in his blood By age twelve, Adam was Pennsylvania and New Jersey s top-ranked dirt-bike racer in his age group When he got his driver s license at sixteen, he bought an old car with money earned at the family car wash, gutted it, and campaigned on dirt tracks Alex Miller, a Sports Car Club of America regional racing official, thinks Adam McMurtrie is a natural, combining solid skills with winning aggressiveness Adam s racing record shows that.

whip antenna The antenna can be a 6 piece of #20 ga stiff solid copper wire or a small telescoping aluminum antenna connected to capacitor C1 Radio Shack has a good selection of whip antennas You could elect to solder the wire antenna directly to C1 and just bring the antenna out the top of the enclosure, or you could install a small 1 2 mini jack for the antenna on the rear of the enclosure The selectivity is reduce as the antenna length is increased so best performance is achieved with the shortest acceptable antenna Try increasing the 18 pF capacitor value when using very short antennas and decreasing it for long antennas In order to tune the passive aircraft receiver you can either leave a small hole on the side of the plastic enclosure to adjust the frequency using a plastic tuning tool, or you need to find a way to attach a plastic knob onto the tuning screw; you will have to drill a larger hole in the case to bring the knob outside the case for easy tuning

To test the passive aircraft receiver, park near your local airport Turn on the passive air-band receiver, attach your wire antenna or pull up your telescoping antenna and tune the receiver You should try to listen when you see an aircraft take-off or land or when you see an aircraft taxiing along the runway If you can get close to the tower in a small airport, that should ensure that you will be able to test your receiver adequately As you see a plane arrive or leave, tune around the band and you should hear either the pilot or the control tower If you plan on taking the passive aircraft receiver on-board an aircraft to listen-in to the pilot during your flight, you should ask the pilot or stewardess if it is permitted aboard your aircraft Generally you are given permission without a problem Enjoy building and using your new aircraft receivers!