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Alignment of the air-band receiver consists of simply adjusting L6 for the desired tuning range and peaking the IF transformer (L7) If you are using a signal generator, frequency counter or other VHF receiver for calibration, remember that you want to set the local oscillator frequency 107 MHz higher than the desired signal or range to be received Adjustment of the L6 oscillator coil MUST be made with a non-metallic alignment tool The use of a metal tool of any kind will detune the coil drastically, making alignment almost impossible Also, if you re receiving FM broadcast stations, you have the slug tuned too far down in the coil form Turn it until it is higher in the form and try again One other thing that you can do to improve the operation of your kit is to spread out the three 2-turn coils at the antenna input, L1, L3, and L5 Stretching these out will give you greater sensitivity Once you know you are receiving aircraft or airport transmissions, adjust the IF transformer (L7) for best reception Typically, L7 is adjusted 2 3 turns from the top of the shield can If you don t have any signal reference equipment at home, and are not yet hearing airplanes, your best bet is to pack up your AR1C and needed tools and head for the nearest airport! If there is no control tower, don t hesitate to visit a general aviation service center on the airport grounds If you ve never done this before, you will probably find it to be a fun and interesting experience Ask which are the most active frequencies and adjust L6 and your front panel tuning control until you hear the action A ground service operator or private pilot may be willing to give you a brief test transmission on the 1228 Unicom frequency Remember, also, that if your airport has ATIS transmissions, you can get a steady test signal as soon as you are line-of-sight with its antenna The aircraft receiver does not produce a loud hiss when no signal is being received (unlike an FM receiver or expensive AM receiver); this is due to the somewhat limited amount of IF or Intermediate Frequency gain Increasing the IF gain would produce a hiss and marginally better sensitivity (about a microvolt) but also require much more alignment, AGC circuitry, and builder ability far beyond the intention of this kit.

An antenna for your new aircraft receiver can be as simple as a 21 piece of wire, an extendable whip antenna or a roof-mounted ground-plane aviation antenna Most folks near an airport will get plenty of inthe-air action from a wire or whip antenna, but if you re more than a few miles away, a decent roof-mount antenna is the way to go Radio Shack sells an ideal antenna designed for scanners which covers the aircraft band nicely and it costs around $30 A low cost TV antenna works well, even better if rotated 90 degrees (remember aircraft antennas are vertically polarized)

Engineers should be creative, inquisitive, analytical, and detail oriented They should be able to work as part of a team and be able to communicate well, both orally and in writing If you possess most or all of these skills, you may excel in this diverse eld Beginning engineering graduates usually work under the supervision of experienced engineers and, in large companies, may receive formal classroom or seminar-type training As new engineers gain knowledge and experience, they are assigned more dif cult projects with greater independence to develop designs, solve problems, and make decisions With increasing experience and responsibility, engineers advance to become technical specialists or to supervise a staff or team of engineers and technicians Some become engineering managers or enter other managerial or sales jobs

With the varactor tuning control capable of going across 10 15 MHz, and with pilots and controllers talking so briefly, you will need to get used to tuning your receiver! You ll find that ANY knob gives smoother tuning than the bare control shaft, and that a vernier dial will make the procedure even easier but at the expense of being able to check up and down the band quickly, which you might like to do if you re tracking the same airplane The air-band receiver is designed to let you explore the entire communications section of the aviation band If you become really interested only in being able to check a certain frequency such as a nearby FAA control tower, or Unicom, it will be helpful to mark that spot on a dial template such as is reproduced for your convenience below

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