After some tidying up of the intercom wiring, I install the fuse to get some electrons flowing. I have a green light so all worked well. I test the intercom functions between each side, and it works.



I then switch on the radio and the fuse blows. After some investigation I fond that one of the plug is missing it's insulation washer. I then can test the reception by listening to the traffic at the nearby Lognes airport.
Next I try some transmission, but with no luck. First thing I find is there is a problem with one of the BNC connectors on the cable. I replace it, but I still have no transmission.
Some more investigation show that I have been mislead by one of the wiring diagrams and reversed two wires on the plug I soldered yesterday. After the wire are switched, I successfully test the transmission, the red light illuminates on the intercom panel and I can hear the transmission on a hand held radio.



Today we also completed the 2000th hour building.