Is it ok to use headphones through the external speaker jack? Not as worried about just listening as i am transmitting. i have not found anything on the web regarding this. That might be for a good reason, but the curiosity remains. Concern being difference in ohms, and if i would transmit with the headphones plugged in, would lightning bark between my ears or produce a squeal on the receiving end of the conversation? i haven't tried it out of respect for the radio..