Thunderbug and M Mouse,. .. .am I right in thinking that simply by operating the transmit side of the radio you can make the receiver wake up?. .. .Also, are the radios on the aircraft types that you mentioned all from the same manufacturer?. .. .It seems odd that a fault like this has gone unchecked for any period of time. Communications are such an essential part of the operation that I would have hoped that a manufacturer would leap on this and come up with a cure as soon as possible.