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RADIO BROADCAST
Fig. 2. In this circuit practically the same arrangement has been followed as in Fig. i. However, this set is designed for use from an alternating power supply. The motor-generator is replaced in this instance by two rectifier tubes and a transformer made with three secondaries; one for lighting filaments of rectifiers; one for filaments of transmitter tubes, and one
for the high voltage plate supply.
shown, and displaying it in the store, it is possible for the patrons to see at a glance how each unit is employed in the assembly.
LIST OF RADIO TELEPHONE OUTFIT PARTS Apparatus in Fig. i Approximate
A Antenna
B I Thermo-Ammeter, each $18.25
C I Inductance 8. 50
D I Variable Condenser 4-75
E Ground Connection
F I Condenser, .005 mfd., 1,000 volt . . . 2.00
G I Grid Condenser i.oo
I 2 Rheostats 1.20
J I 10,000 ohm Grid Leak 1.25
K I Motor-Generator 99.00
L I No. 21 A Fixed Condenser 2.55
M I Two-Coil, 1 50 milliampere choke . . . 6.00
N I Single-Coil, 1 50 milliampere choke . . 4.00
O I No. US 100 Duo-lateral coil . . . . 1.30
P 1 No. 3 Acme Modulation Transformer . 7.00
Q I S. P. D. T. Switch 64
R I Telegraph Key 2.00
S I Buzzer 2.50
T I Microphone 2.65
U 1 Battery, 22-2 volts 2.25
V I, 6 V, 80 A Storage Battery 30.00
X 10, No. 3 Spring Connectors .05
Fig. 2
All parts bearing the same markings as in Fig. i are duplicates. As previously mentioned, the motor-generator is done away with and the filament lighting battery may be put in the microphone circuit, as shown. The parts which differ from those in Fig. i are included by the dotted lines and follow:
A' 2 No. U. V. 216 20 watt. Rectifier Tubes . $7.50
2 Tube sockets i.oo
B' 1 200 Watt C. W. Transformer .... 20.00
C 2 .001 Mfd. Condensers .75
D' I 5 ampere Rheostat 2.00
Note: The "x's" in the first diagram indicate the points at which alterations must be made in order to employ A. C. or D. C, as desired.
In addition to placing a demonstrating outfit of this character in the show case, it is essential that a list of the units employed, showing the price of each, be conspicuously displayed. Where the dealer's stock is made up of units designed for the same use manufactured by