I did check the Notams and didn't see anything about the military playing - but I could have missed it. Neutron - that might be the answer, as the radio stack is vintage, an old King and a newer one with 'flip flop' facility. This raises another issue. There are no static discharge wicks on the aircraft and there is significant random noise on both radios and the intercom. And the alternator whines a lot too! Methinks a bit of work needs to be done electrically...
