Stop spreading misinformation. The higher output remotes are the G300A and G300B, the C version is the only remote with lower output.Unfortunately that's not the long distance remote model.
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OK, I'll stop talking to you since it looks like you do not want to learn. However, for the OP's and everyone else's benefit, I'll post a quote from GadgetGuy taken directly from this thread: GadgetGuy's First Flight Impressions of the P4You stop the A version is the only one with higher frequency. I had DJI confirm this for me last week.
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Both the A and B units have the most, but that's only half the equation.
The newest GL300C is the worst of all in terms of power output.
GL300A and GL300B are the same at 0.38 watts*
GL300C is only 0.303 watts, or 20% less.
P4 aircraft video output power is only 0.598 watts, 20% less than 0.746 watts of the W323 P3P.
More control range is of no use, if it isn't fully supported by stable FPV video from the aircraft.
You will always lose video before you lose control.
You can't fly blind.
*Note: Power outputs specified on the FCC ID# documents for the GL300A and GL300B have a misplaced decimal point. They are not 0.038 watts!