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Updated: June 3, 2025
To do this you need only to use a voltmeter across the filament terminals instead of an ammeter in series with it; then regulate the voltage of the filament with a rheostat. The Operation of C. W. Telegraph Transmitters with Alternating Current With Two Oscillator Tubes. In other words these oscillations are sustained but as in the case of those of a single tube, their amplitude rises and falls.
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.
The relux plate, subject now to eddy currents, since there was no other path for the energy to take, began to heat up rapidly. "I'm going to close the switch into the coil now," said Arcot. "Watch the meters." A relay snapped, and instantly the ammeter jumped to read 4500 amperes. The voltmeter gave a slight kick, then remained steady.
Then one morning, as we were at breakfast, a great big splendid Manton car my car came whisking up the drive and stopped in front of the house, and the expert they had thrown him in for a week for nothing him and an odometer and an ammeter, and a new kind of French spark-plug they wanted me to try and a gasoline tester the Mantons are such nice people to deal with in all those little ways and the expert sent in word: would Miss Hardy come out and see her new car?
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.
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.
You can find out which is which by connecting in the interrupter and trying it, or you can use a polarity indicator. An electrolytic interrupter can be bought for as little as $3.00. How to Adjust Your Transmitter. Tuning With a Hot Wire Ammeter.
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.
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.
You can find out which is which by connecting in the interrupter and trying it, or you can use a polarity indicator. An electrolytic interrupter can be bought for as little as $3.00. How to Adjust Your Transmitter. Tuning With a Hot Wire Ammeter.
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