Potential miswiring of positive and
negative terminals prevent any experimentation; it must be widely known
to work out of the box by being connected to the radio.

Darrell-

Perhaps the 120 VAC plugs are sufficiently standard, but radios powered from a
separate DC source usually come with a cable that could easily be connected
backwards. The only way I know for equipment to work out of the box on battery
power, with no chance of being misconnected to the power supply, is for it to
come with something like the Anderson PowerPole connector system. The power
source must be set up with it as well. I understand one model of Yaesu does
come with PowerPoles, but it may not meet your other needs.

There is a small Yaesu radio, as well as the Icom 703, that may meet most of
your needs. Whatever you decide, I believe it will require some help to set
things up.

For a custom system for blind Hams, you might contact MFJ and see if they are
interested in producing something that matches your requirements. I think they
currently produce most of the items needed, just not set up in a "blind-proof"
package.

73, Fred, K4DII