Dear John, Thanks for your suggestion. The Sun produces more ionosphere heathing than all transmitters of world. But, the intereference of Sun is White Noise. Analog television, for example, generates large amounts of impulsive noise. I'm affraid with nonlinear effects, like Luxembourg Effect. Is the cross-modulation a real problem in radiocommunication? [s] Jonas/ Jonas; This us radio show covers it (three hour interviews) from time to time: www.coasttocoastam.com; II?ve heard about 2 dozen interviews on the topic. Maybe we could do a ?Save the Ionosphere? campaign. John > De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En nombre de negrjp Enviado el: Saturday, October 13, 2007 4:30 PM Para: opendtv Asunto: [opendtv] Re: wireless age > Thanks, John. Atmospheric Heating is a very, very hot theme. Jonas.