"The secondary toroid of the directional coupler has a direct path to ground. That means there is no straight-through DC path."
I may have misunderstood the schematics. What I see is a DC path between J1 input and "ATU". If K20, K21 and K18 are all in the NC state there will be a low impedance DC path between "ATU" and ANT-1. If any of these relays is faulty and not closed the DC path will be open. Sure, there is a DC path between J1 and ground through the coupler but I don't see how that changes the path to ANT-1. If ANT-1 is open circuit to XMTR isn't it likely that K18, K21, or K20 is faulty? I realize this is now just a mental challenge as the OP's problem has already been solved. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
