] wrote:

However, her question has piqued my curiousity, and I'll ask the rrab
readers to answer one of mine: why were the transmitters of "twin"
receiver/transmitter combos, such as the R-4/T-4 pair, designed with
separate supplies?

Look at a T4-X for example and look at the PS. Then try to figure out
how to fit that same PS in with the xmtr.
:-)

-Bill