At 05:28 PM 8/19/2007, Eric Fort wrote: >The only birds I see flying for voice communications are oscar 50-52 which >are fm single channel operation. did I miss something or are there no birds >currently flying with active linear transponders? VO-52 is linear, and of course, AO-7 is still working. 73 de VK3JED http://vkradio.com