Steve,
  The T-4X puts a –30 volts on the INJ line when the XMTR position is selected. 
That –30 shuts down the R-4A’s premixer V8. In RCVR position the –30 volts is 
removed, the T-4X’s PTO output is deselected, and the R-4A’s injection is then 
free to be boss.

73, Gary
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