Ok so the GL300C controller has a frequency range of
2404.00000000 - 2470.00000000 and power output of 0.3030000 .
The W323B Phantom 3 Professional has a frequency range of
2406.50000000 - 2476.50000000 and a power output of 0.5200000
The GL300B controller has a frequency range of
2404.00000000 - 2480.00000000 and a power output of 0.0380000
The W323A Phantom 3 Professional has a frequency range of
2406.50000000 2476.50000000 and a power output of 0.6120000
So it looks like both the GL300C and W323C models have less power output for the control and video transmission signals. I wonder if that will really affect range though as the GL300A controller had more power output than the GL300B and I can't say if the range is really affected because I don't have a GL300A controller but I can get 2 miles urban and 3-4 miles in an open area.
Maybe the pro's can chime in but...... I'm pretty sure .038 for the "B" model is LESS than the .303 for the "C" model. Sounds to me like the "C" is better than the previous radios. Anyone wanna trade?