Show use of more coils to add selectivity to set in the construction of the addI additional tIona colls coils writes a correspondent in radio digest use one spiderweb spider web form and ana wind whid on two wires one ten turns more than the other for instance if your original tuner coll coil 0 lias has 45 turns make the coil A 40 turns and coll coil B BO 50 turns disconnect the input of the set from the usual coll coil D and make con ata ata c bo A C I 1 M T 42 T 5 diagram showing how connections are made sections as shown place an 11 plate or 23 plate variable condenser lu in the antenna circuit the colls coils A and B are tuned simultaneously by the 24 plate condenser F this automatically tunes out stations having a slightly different wave length on each side ride of the station wanted and narrows down the static band if this la Is properly assembled it will malke make a very sharp tuner for the regenerative set |