2ghz-g-turbo channels limitation

I have a wireless card “Atheros AR5213” installed on RouterBOARD 333. It is possible to use only one channel on it in 2ghz-g-turbo mode.

 0 interface-type=Atheros AR5213 chip-info="mac:0x5/0x9, phy:0x43, a5:0x36, a2:0x0, eeprom:0x4008"
   pci-info="00:12.0" capabilities=tx-power-control,ack-timeout-control,virtual-ap,alignment-mode,
                                   noise-floor-control,scanning,burst-support,nstreme,sniffing,
                                   compression,power-channel,wmm
   default-periodic-calibration=enabled
   supported-bands=2ghz-b,5ghz,5ghz-turbo,2ghz-g,2ghz-g-turbo,5ghz-10mhz,5ghz-5mhz,2ghz-10mhz,2ghz-
                   5mhz
   2ghz-b-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,2462:0
   5ghz-channels=5180:0,5200:0,5220:0,5240:0,5260:0,5280:0,5300:0,5320:0,5745:0,5765:0,5785:0,5805:0,
                 5825:0
   5ghz-turbo-channels=5210:0,5250:0,5290:0,5760:0,5800:0
   2ghz-g-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,2462:0
   2ghz-g-turbo-channels=2437:0
   5ghz-10mhz-power-channels=5175:0,5180:0,5185:0,5190:0,5195:0,5200:0,5205:0,5210:0,5215:0,5220:0,
                             5225:0,5230:0,5235:0,5240:0,5245:0,5255:0,5260:0,5265:0,5270:0,5275:0,
                             5280:0,5285:0,5290:0,5295:0,5300:0,5305:0,5310:0,5315:0,5320:0,5325:0,
                             5740:0,5745:0,5750:0,5755:0,5760:0,5765:0,5770:0,5775:0,5780:0,5785:0,
                             5790:0,5795:0,5800:0,5805:0,5810:0,5815:0,5820:0,5825:0,5830:0
   5ghz-5mhz-power-channels=5175:0,5180:0,5185:0,5190:0,5195:0,5200:0,5205:0,5210:0,5215:0,5220:0,
                            5225:0,5230:0,5235:0,5240:0,5245:0,5255:0,5260:0,5265:0,5270:0,5275:0,
                            5280:0,5285:0,5290:0,5295:0,5300:0,5305:0,5310:0,5315:0,5320:0,5325:0,
                            5740:0,5745:0,5750:0,5755:0,5760:0,5765:0,5770:0,5775:0,5780:0,5785:0,
                            5790:0,5795:0,5800:0,5805:0,5810:0,5815:0,5820:0,5825:0,5830:0
   2ghz-10mhz-power-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,
                             2462:0
   2ghz-5mhz-power-channels=2412:0,2417:0,2422:0,2427:0,2432:0,2437:0,2442:0,2447:0,2452:0,2457:0,
                            2462:0

I am not so good in wireless. But can anybody tell me why it is so?

Is there any way to use other channels in 2ghz-g-turbo mode? Superchannel license?

by standard it is locked to that channel. If you don’t like it, you can obtain the superchannel license.

Can you tell exact channel numbers which I shall be able to use with superchannel license in 2ghz-g-turbo mode?

all range that card supports from 2.3ghz till 2.5ghz