|>how do I hook up the signal line of the receiver to turn this beeper |>on? (The beeper will only have +/- power-lines and no signal line).
No need to worry about it.
| Sounds like something like the Air Alert would be what you need. Light | and cheap: | |
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Yup. These work perfectly. I've put one into most of my planes, and they've saved me a lot of grief. Nothing sucks more than going down to the local slope with some others, then flying around, and then you find that your plane won't listen to your controls, then you realize that the plane you were `flying' wasn't your plane at all, and now you've no clue where your plane is -- it probably crashed a minute ago, somewhere ...
The alarms aren't really *that* loud, but you can hear them from a few hundred feet if it's quiet, and 50 or so feet if it's really windy. And even 50 feet is a HUGE improvement -- it's amazing how easy it is to hide even an 8 foot wing span plane in some brush or trees so that you'll never find it, even if it's only 10 feet away. Without the alarm, I've even had to resort to aerial photography to find missing planes. Like this case --
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In general, these alarms are triggered by no signal reaching the servo plug they're plugged into. THe Hobbico one is also triggered by the that servo being idle for more than a few minutes, which means that it'll work with all RXs. (Some RXs always send a valid signal to the servos, even if the TX is turned off.) The downside is that while your RX is on, you need to wiggle the sticks every minute or two or the alarm will trigger. Of course, that will also warn you if you left the plane on when you put it in the car, so it's not all bad.