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Updated: June 3, 2025
When you tune the transmitter so that the ammeter shows the largest amount of current surging in the aerial wire system you can consider that the oscillation circuits are in tune. General view of Power Room. The Buzzer and Dry Cell.
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.
The condenser is therefore adjustable and, as you will see from the picture B, it has one terminal wire at one end and three terminal wires at the other end so that one, two or three condensers can be used in series with the aerial. A condenser of this kind costs $5.40. The Aerial Ammeter.
Begin by connecting one post of the ammeter with the wire that leads to the aerial and the other post of it to one end of the tuning coil; connect clip 1 to one terminal of the .002 mfd. 3,000 volt aerial condenser and the other post of this with the ground.
The Pirate was trying to maintain his invisibility, while the rapidly growing strength of the machine above strove to batter it down. In moments the ammeter connected with the disrupter beam began to rise so rapidly that Morey watched it with some concern. Despite the ten-kilowatt set being used to project the beam, the resistance of the apparatus on board the pirate ship was amazing.
As soon as the connections were completed, the robot backed swiftly out of the room, and Arcot turned on the magnet and the ray projector. Instantly, there was a sharp deflection of the kilovoltmeter. "I haven't yet closed the switch leading into the coil," he explained, "so there's no current." The ammeter needle hadn't moved.
Begin by connecting one post of the ammeter with the wire that leads to the aerial and the other post of it to one end of the tuning coil; connect clip 1 to one terminal of the .002 mfd. 3,000 volt aerial condenser and the other post of this with the ground.
The only differences between this and the preceding transmitter are: the magnetic modulator, if you use one, should have an output of 3-1/2 to 5 amperes; you will need two 50 watt oscillator tubes with sockets; two 150 watt rectifier tubes with sockets; an aerial ammeter that reads to 5 amperes; three 1 mfd. filter condensers in parallel; two filter condensers of 1 mfd. capacitance that will stand 1750 volts; and a 300 milliampere filter reactor.
The heavy coronium spring grew warm and began to glow dully, while the ammeter dropped slightly because of the increased resistance. The relux plate cooled slightly, and the voltmeter remained steady. "The coil you see is storing the energy that is flowing into it," Arcot explained.
All of the apparatus for this C. W. telegraph transmitting set is the same as that described for the 100 and 200 mile sets but you will need: one or two 50 watt oscillator tubes with sockets; one key condenser that has a capacitance of 1 mfd., and a rated potential of 1,750 volts; one 0 to 500 milli-ammeter; one aerial ammeter reading to 5 amperes, and an A. C. power transformer for one or two 50 watt tubes.
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