I was recently looking at the circuit for an HF radio amplifier called the "Packer" amplifier. It's a typical HF amplifier that puts out about 35 watts.
The final output stage uses IRF510 MOSFETS connected to a "balun", which is basically just an isolation transformer at RF from what I know.
There is one aspect of it I do not understand:
The points labeled "SWV" are just the supply rail (DC voltage). C4 and C9 are isolation capacitors. What I don't understand is T2 and how it works or what it does. In the documentation it is called a "phase reversal choke". I'm familiar with common mode chokes found in appliances and what they do, but the topology of how this is wired really confuses me.
Wouldn't current just flow from
Q2 as it turns on, taking a path through
T2 at terminals
2 ? Why would any current be present in
T1 at all?