I've been unable to enable Superchannel on any MikroTik ac radios that we've purchased. My organization is permitted to use 4.9 GHz, and I am trying to set a NetMetal 921UAGS-5SHPacD to 4.9 GHz. I've upgraded the license key to support extra channels, and it shows the "Extra-channels" feature on System | License. However, in the wireless settings, Frequency Mode is stuck on regulatory-domain, Country: United States3. Is it a characteristic of all MikroTik ac radios that they cannot operate in Superchannel mode?
You got an USA version - check the product page:
"RB921UAGS-5SHPacT-NM-US (USA) is factory locked for 5170-5250MHz and 5725-5835MHz frequencies. This lock can not be removed."
"RB921UAGS-5SHPacT-NM (International) supports 5150MHz-5875MHz range (Specific frequency range can be limited by country regulations). "