Soliloquy .. .

^ Do you know anything of Motorola Handhelds, I believe it's
^ an HT-100?

The only Motorola I'm familiar with is the Motorola Saber. The software
permitted a great deal of control over assignments to each channel, including
the PL, power output, squelch level, etc. With the Saber you would be able to
assign the lowest power level to the channels you didn't want to transmit on.
I'm not certain I remember correctly (it's been 10 years) but it might also
permit assigning receive-only channels.

If the HT-100 is newer than the Saber it might have those abilities plus
more.

The Saber also required a programming interface, which consisted of a black
box with a switch on top, a lead to the computer's RS232 port and another to
the radio, and electronic components and a 9VDC battery inside.

Frank