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For this transmitter you require: one oscillation transformer; one hot-wire ammeter; one aerial series condenser; one grid leak resistance; one chopper; one key circuit choke coil; one 5 watt vacuum tube oscillator; one 6 volt storage battery; one battery rheostat; one battery voltmeter; one blocking condenser; one power circuit choke coil, and one motor-generator. The Oscillation Transformer.
Any other good microphone transmitter can be used if desired. Connecting Up the Apparatus. Now connect clip 1 of the tuning coil to one of the posts of the hot-wire ammeter, the other post of this to one end of aerial condenser and, finally, the other end of the latter with the water pipe or other ground.
The Condensers. In these condensers the leaves of the sheet metal are embedded in composition. The aerial condenser will cost you $2.00 and the others 75 cents each. The Aerial Ammeter.
For this experimental continuous wave telegraph transmitter get the following pieces of apparatus: one single coil tuner with three clips; one .002 mfd. fixed condenser; three .001 mfd. condensers; one adjustable grid leak; one hot-wire ammeter; one buzzer; one dry cell; one telegraph key; one 100 volt plate vacuum tube amplifier; one 6 volt storage battery; one rheostat; one oscillation choke coil; one panel cut-out with a single-throw, double-pole switch, and a pair of fuse sockets on it.
The microphone can be connected in the ground wire and the ammeter in the aerial wire and the results will be practically the same. Next connect one end of the grid condenser to the post of the tuning coil that makes connection with the microphone and the other end to the grid of the tube, and then shunt the grid leak around the condenser.
This is the size of tube generally used by amateurs for long distance continuous wave telegraphy. A single tube will develop 2 to 3 amperes in your aerial. The filament takes a 10 volt current and a plate potential of 1,000 volts is needed. A tube socket to fit it costs $2.50 extra. The Aerial Ammeter. This should read to 5 amperes and the cost is $6.25. The Grid Leak Resistance.
One ammeter, for measuring the quantity of current output, was interpolated in the "neutral bus" or third-wire return circuit to indicate when the load on the two machines was out of balance. The circuits were opened and closed by means of about half a dozen roughly made plug-switches.
Here they heard the soft purring of a large oscillator tube and the indistinguishable murmur of smoothly running AC generators powered by large contraterrene reactors. The elder Dr. Arcot glanced in surprise at the heavy-duty ammeter in a control panel. "Half a billion amperes! Good Lord! Where is all that power going?" He looked at his son. "Into the storage coils.
"I haven't been using anywhere near the power I can get out of this apparatus, either. Watch." He threw another switch which shorted around the coronium resistor and the ammeter, allowing the current to run into the coil directly from the plate.
It looks like the aerial ammeter and costs about $7.50. The A. C. Power Transformer. Differing from the motor generator set the power transformer has no moving parts. For this transmitting set you need a transformer that has an input of 325 volts. It is made to work on a 50 to 60 cycle current at 102.5 to 115 volts, which is the range of voltage of the ordinary alternating lighting current.
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