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It is equally important that the ignition harness be in good condition with no breaks in the shielding. In other words, in an ignition system the shielding is most effective when the shielding pigtails are grounded at both ends of the "p" leads. This means the entire magneto system, including the "p" leads (the wires connecting the ignition switch to each magneto), MUST be shielded type leads with the external shielding carefully grounded, both at the magneto and at the opposite end, at the ignition switch. On the other hand, noise-free radio reception depends, in great measure, on a properly shielded ignition system. And you don’t have to worry about installing a shielded ignition system complete with expensive aircraft type shielded spark plugs and harnesses. Naturally, if you do not intend to use an onboard radio, you don’t have to worry about ignition noise. Perhaps the most common contributor to aircraft radio noise is the ignition system. Since radio noise can originate almost anywhere in the aircraft, it should come as no surprise to learn that a particular radio noise problem is most often traced to something no more mysterious than a poor battery ground connection or a loose accessory ground connection.
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Otherwise when you try several corrective actions before checking the results of each, you might never learn which of the "cures" really solved the problem. After you pinpoint a noise producer, you can then try one "fix" at a time.Īlways check the results of that effort before trying something else. Do this with the radio(s) ON and with the engine running - then again with the engine shut down. Then, check the operation of the various electrical systems (lights, strobes, fuel pump, rotating beacon, intercom, etc.), one at a time, listening for noise. Begin by examining the obvious and the easiest to check potential trouble sources: poor ground connections, loose terminals, broken or frayed wires, inadequate shielding. Tracking down and curing an unwanted radio noise problem is no different. Troubleshooting any kind of problem is based on common sense and logic. Once this is done, the necessary corrective action often becomes obvious and is readily accomplished. You can, for example, solve a fair share of the typical radio noise problems you encounter by first locating and isolating the source of the noise problem. Your success in eliminating a particular radio noise might even surprise you. Nor is it only something a highly skilled radio technician can do.īefore you go charging off to the nearest avionics shop with an armful of radios, why not try to do a little elementary troubleshooting of your own. In other words, the most troublesome noise is that caused by stray electromagnetic waves that emanate from installed electric equipment, such as magnetos, alternators, relays and the like, and are not necessarily the fault of the avionics equipment installed.Ĭontrary to hangar tales you may have heard, the elimination of radio noise has nothing to do with black magic. Of course, when they are audible to our ears that condition can become quite annoying and personally unacceptable.Īnyway, it might surprise you to learn that many of these troublesome radio noises often result from the poor wiring installations sometimes incorporated during the construction of an aircraft. In effect then, noises are there whether we can hear them or detect the visual effects in our navigation receivers.
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This hostility is manifest not only by the audible noises heard in the aircraft’s headsets and speakers but also by the effects such electrical disturbances have on the outputs of navigation receivers and other navigation equipment.
Buzz ignition training webinar install#
When you install a radio in an engine-powered aircraft you will be subjecting it to an environment that can be quite hostile to good radio reception.