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This is a small closed iron core transformer of peculiar design and having a primary and a secondary coil wound on it. This device is used to control the variations of the oscillating currents that are set up by the oscillator tube. It is made in three sizes and for the transmitter here described you want the smallest size, which has an output of 1/2 to 1-1/2 amperes. It costs about $10.00.
This consists of: a source of direct or alternating current, a telegraph key, a vacuum tube oscillator, a tuning coil, and a condenser. This kind of a transmitter sets up sustained oscillations instead of periodic oscillations which are produced by a spark gap set. The Wireless Telephone Transmitter.
While I'm doing this, you might be getting those five coils into exact resonance, if you want to." "Sure I want to," and Nadia made her way across to the short-wave oscillator and set to work. After an hour or so, bent over her delicate task, she began to twitch uneasily, then shrugged her shoulders impatiently. "What's the idea of staring at me so?" she broke out suddenly.
To send out continuous waves in the ether such as are needed for wireless telephony instead of damped waves which are, at the present writing, generally used for wireless telegraphy, an electric oscillation arc or a vacuum tube oscillator must be used, see C, instead of a spark gap.
The choke coil is wound up of about 250 turns of No. 30 Brown and Sharpe gauge cotton covered magnet wire on a spool which has a diameter of 2 inches and a length of 3-1/4 inches. The 5 Watt Oscillator Vacuum Tube.
When I first began transmitting six years later, having 'discovered' the amateurs, I chose the callsign RX as I had been a listener so long, and also remembering the excitement of listening to G6RX. In 1930 I moved to Athens and became a salesman for RCA radios. My first transmitter was just an electron coupled oscillator using a type 59 output pentode from a radio.
A 500 Mile C. W. Telegraph Transmitter. For sending to distances of over 200 miles and up to 500 miles you can use either: three or four 5 watt oscillator tubes in parallel as described above, or one 50 watt oscillator tube. Much of the apparatus for a 50 watt tube set is exactly the same as that used for the 5 watt sets.
The operation of key circuits of the latter kind will be described presently. The Operation of C. W. Telegraph Transmitters with Alternating Current With a Single Oscillator Tube. Where an oscillator tube telegraph transmitter is operated by a 110 volt alternating current as the initial source of energy, a buzzer, chopper or other interruptor is not needed in the key circuit.
The low voltage secondary coil which heats the filament develops 10.5 volts. This transformer will supply current for one or two 50-watt oscillator tubes and it costs about $40.00. Connecting Up the Apparatus. In time past the most difficult of all electrical apparatus for the amateur to make, install and work was the wireless telephone.
I think you'll find a metallic oscillator in there. Analyze it. Might be useful." Harry turned the box over in his hands. "Probably has a timer in it to start it.... Well.... That helps." "What do you mean?" "I've got a pretty good idea who put it here. Older kid. Nineteen maybe twenty. Seemed like a nice lad, too. Didn't take him for a JD. Can't trust anyone these days. Thanks, Mike.
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