The concept of being able to monitor selected frequencies within the R/C band is by no means new. Having such a facility, however, provides the user with the benefit of an increased degree of control over the channel in use. There is always a possibility that a transmitter may have been accidentally left switched on in the pits area, and the channel peg returned to the board for another unsuspecting pilot to use. Another familiar scenario, which does occur, is where a transmitter has been switched on to perform some test function or other. This can happen in a parking area or the pits, and without having an applicable frequency peg in use. Either way, this is an objectionable habit sometimes performed in complete ignorance of the dangers; or on the other hand, fully aware and belligerently taking a chance for perhaps no more than a couple of seconds. Occurrences such as these may only be very occasional, but they do occur, and with the possibility of disastrous results, of which we are all too-aware. These are just a couple of instances where it is desirable to determine that other users are not already using your channel prior to committing a model to take-off.
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