The instant you use a transmitter, you've given away some intelligence. In fact, if the enemy is close enough, the instant you use a receiver, you've given away some intelligence. Basic, basic ECCM.
It's not rocket science, and one can develop this theme as much as one likes. It becomes a matter of policy how much low level int one is willing to gift to the enemy versus the inconvenience of taking steps to guard against this.
Electronic silence, anyone?