let take a look to frequency today
A certain number of frequencies have been designated by law for use with radio control cars, and rc surface vehicles in general (such as boats and tanks etc.).
They fall into the 27MHz and 75MHz bands and each separate frequency has been given a channel number. This channel number, though, has nothing to do with the number of channels that an rc vehicle has, it's just the same word for a completely different thing ie a 2 channel rc car is not operating on frequency number 2, it means that it has control to 2 channels ie motor and steering.
RC models operating close to one another cannot do so on the same frequency because the radio waves being sent out from one transmitter will interfere with signals from the other transmitter.
For this reason, it's very important that you check to see whether anyone else is operating another rc model nearby, before you start running yours. By far the easiest way to do this is to use a 75MHz frequency checker.
If you join a club, there will normally be a 'peg board' frequency control system in operation whereby each member running their car has to notify other members which frequency they are using by marking their frequency, or channel number, on a board of all channel numbers.
A typical club peg board might look something like this...
Designated frequencies in the 27MHz band
It's worth noting that frequencies within the 27MHz band have also been given a unique color, as well as a number. These are:
Channel # Color Frequency (MHz)
1 Brown 26.995
2 Red 27.045
3 Orange 27.095
4 Yellow 27.145
5 Green 27.195
6 Blue 27.255
Designated frequencies in the 75MHz band
These are not color-coded, only numbered. They are:
Ch.# / Frequency (MHz)
61 / 75.410
71 / 75.610
81 / 75.810
62 / 75.430
72 / 75.630
82 / 75.830
63 / 75.450
73 / 75.650
83 / 75.850
64 / 75.470
74 / 75.670
84 / 75.870
65 / 75.490
75 / 75.690
85 / 75.890
66 / 75.510
76 / 75.710
86 / 75.910
67 / 75.530
77 / 75.730
87 / 75.930
68 / 75.550
78 / 75.750
88 / 75.950
69 / 75.570
79 / 75.770
89 / 75.970
70 / 75.590
80 / 75.790
90 / 75.990
It's so important that you check your frequency channel is clear before you switch on your own transmitter, or you may unwittingly cause a fellow rc driver to lose control of his vehicle.
