I thought “High” means something in the Microwave spectrum and “Low” the lower one. But probably it is used to define the bandwith of an repeater.
It would be a good idea to add some tooltips to clarify what is meant, and what unit is used. (For example BaudRate in bit or in byte per second). The Invert option is also unclear for me, what it means.
I think we should include a toggle at top of each transmitter to signal that it is a transponder. Only then transponder specific options should appear (high and low on uplink and downlink, and also invert option)