Report "We have a comdial sx-80 pbx. we are also a AM radio station. our transmitter causes the comdial to bring most digital extension phones (comdial 7269) off hook and drives everyone crazy. does comdial have a solution for am radio interference. a common mode choke does not work and causes the digital extensions to not "see" the pbx at all. help gerry kc8zul columbus ohio"