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#40
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Using R/C aircraft band is illegal...
Quote:
From a practical point of view, remember that in some areas schools often have the only clear field, so many R/C airplane enthusiasts use local school yards after school and on weekends for their flying. If you fire up your edubot on an aircraft band while someone is flying in your school's field nearby, you'll probably crash their plane. Believe me, they'll be pissed off, and your team could even be liable for the damages to a multi-hundred dollar R/C airplane because you were illegally on their frequency. Considering the exponential growth in the number of schools involved in FIRST these days, the constant elimination of other clear fields in communities from population growth housing/building construction, and the fact that our "hot" time includes almost two months of contiguous weekends, conflict is a non-trivial possibility that will only increase with time. Therefore, use ONLY ground frequencies. If you crash someone's car, you were both on the band legally (and R/C car are expected to take crashes! )...BTW, regardless of ground frequency, R/C car controls are often only two channel. Given a four or more channel radio if you skip the first two servo channels for your drivetrain you'll protect yourself from most R/C Cars that happen to be on the same frequency (though your grippers may be "jumpy", so watch out). Even if they have more channels, R/C cars normally use the first two servo channels for speed and steering and the rest for switches, which simply turns your motors on to a set value instead of making them behave wildly as they run their car. [edit] BTW, Another advantage of FM radios is that they tend to "lock" onto the strongest nearby transmitter. Since all are roughly equal in power (with full batteries), that means a given receiver normally listens to the closest transmitter of that frequency, which should be yours. [/edit] Quote:
#2: Depends highly on the brand, and the model. High end models/brands are often worth the changeover, as they normally have modular transmitter "bricks" which can be swapped out easily in minutes. OTOH, Cheapie rigs normally aren't worth the effort and expense for the entire guts are on one PCB. You'll either basically have to replace the entire board inside to change the transmitter's band, or incur a tech's bench time to change components and realign the radio. Either of these tasks can easily cause the retrofit to exceed the price of a new transmitter. - Keith Last edited by kmcclary : 23-11-2003 at 14:23. |
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