On Fri, Jun 5, 2009 at 8:50 PM, Lee<vk5abc at optusnet.com.au> wrote: > What is the difference between the PRC-74B and C and suppose the C is quit rare? IRRC, the B is marked in MCs/KCs and the C in MHz/KHz. > Anyone know where I can download TM 11-5820-590-35 That I don't know. Myabe one of the more knowledgable here know. BEst regards, Michael, WH7HG