I have a B line Drake that is causing me issues. I try to answer CQ's on it and get no response. I have a TR4C also and always get responses to it. Both are run through the same antenna and tuner using an antenna switch run backwards....one antenna multiple rigs.... Both show the same wattage so I know there is output. When I have the switch on the TX4B I get no reply. I then switch to the TR4C and get a reply right away. What do I need to look at? I am totally confused.