How good is the K3s optional subreceiver?
The subreceiver in the K3 is full performance, not a lower-performance add-in. It uses the same circuitry as the main receiver, accommodates the same options, and has a dedicated DSP of exactly the same type. Because it is a clone of the main receiver, it covers HF+6m. It does not cover 2m, or other VHF/UHF bands.