In playing around with some RF beacons I noticed that there is generally just one driven element, with the other elements connected to ground if present. I'm having some trouble wrapping my head around this idea, for example, when connecting a simple transmitter to a half wave dipole one element would be driven and the other would always be connected to ground.
This is contrary to how I believed radio waves were generated, that is, by having alternating currents in different radials. Other designs have a transformer on the output with the secondary connected to the antenna. This makes a whole lot more sense since both elements of a dipole are then driven. So my question is, does it really make a difference if both elements are driven or if one is simply connected to ground and the other swings around it?
This might be where the balanced/unbalanced thing comes in, which I've never been able to wrap my head around?
Something like the Pixie 2 Transceiver for example, which seems to be fairly popular among the DIY QRP crowd.