A seventy-five ohm, double-pole telephone receiver will do for stations not wishing to receive farther than fifty miles.
In order to secure the best results from wireless instruments, it is necessary to have receivers especially made for wireless. Each receiver should have 1000 ohms resistance. Some boys may find it necessary to purchase one receiver at a time. Two receivers, a double headband, and a double cord, forming a complete head set as shown in Figure 217, should be secured as soon as possible.
Fig. 218.—A Circuit showing how to connect a Double-Slider Tuning Coil.
Connecting the Receiving Apparatus
Figure 218 shows how to connect a double-slide tuner, a detector, a fixed condenser and a pair of telephones to the aerial and ground. The same instruments with a loose coupler in place of the double-slide tuner are shown in Figure 219.
The diagrams in Figure 220 are the same circuits as those shown in Figures 218 and 219, but show different instruments.
Fig. 219.—Circuit showing how to connect a Loose Coupler.
