Speaking of the TCS series. Q.Why is the Antenna Loading Coil L108 wired differently on different TCS series ? The "front" of the coil goes to S-103 on my TCS-13 and on my TCS-9, S-103 is connected to the"rear" of the roller inductor L108. See: http://k4che.com/TCS%20equipment/Loading%20coil%20Mystery/Loading%20Coil%20Wiring.htm k4che