It's all about the Software

Weird one this...

If I start SDRC with the AGC panel visible, then the splash screen stays up indefinitely while the task sits burning CPU (see screenshot). Note, the radio (an SDRplay RSP2) has not been started. The splash screen does go away when...

In later versions of the gateware on the HL2 there is a band-volt modification to automatically change the band on a linear amplifier (it sends a specific voltage per-band to the amp).

It's explained here:

This mod implements the generation PWM...