1 | Vario-coupler of special design (see Fig. 5 and text.) This coupler comprises L1 and L2. |
1 | Loop antenna having 12 turns each 3½ feet on a side. |
1 | 6-volt storage battery. |
4 | to 6 22½-volt blocks of "B" battery. |
2 | 1500 turn honeycomb coils. (L3 and L4.) |
1 | air core choke (L5). May be made by winding 300 turns of #28 insulated magnet wire on a form 4 inches in diameter. |
3 | Variable air condensers having a maximum capacity not less than .001 MF. (C1, C3, and C4.) |
1 | Fixed condenser, capacity .005 MF (C2). |
2 | Filament current rheostats. |
2 | Vacuum tube sockets. |
1 | Pair phones. |
2 | Am | plifier vacuum tubes. These tubes must be of the hard variety. Soft, or gassy tubes will not function satisfactorily. The regenerator tube may be a Moorehead, Radiotron UV-202 or any one of the Western Electric tubes such as Types E, J, V, or L. The oscillator tube should preferably be one of the latter, though either Radiotron UV-202 or UV-203 may be used, preference being given the latter. |