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Updated: June 3, 2025
Now connect the end of the tuning coil that leads to the ammeter with one end of the .001 mfd. grid condenser and the other end of this with the grid of the vacuum tube. Connect the telegraph key, the buzzer and the dry cell in series and then shunt them around the grid condenser.
This instrument is also called a hot-wire ammeter because the oscillating currents flowing through a piece of wire heat it according to their current strength and as the wire contracts and expands it moves a needle over a scale. The ammeter is connected in the aerial wire system, either in the aerial side or the ground side the latter place is usually the most convenient.
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.
This instrument is also called a hot-wire ammeter because the oscillating currents flowing through a piece of wire heat it according to their current strength and as the wire contracts and expands it moves a needle over a scale. The ammeter is connected in the aerial wire system, either in the aerial side or the ground side the latter place is usually the most convenient.
They were all up to capacity, save the ammeter from the coils. That wasn't registering yet. Suddenly it flicked, and the other instrument dropped to zero. They were in artificial space. "Come here, will you, Morey," called Arcot. In a moment Morey joined his much worried friend. "That artificial matter control won't work through ray screens.
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.
Another thing we had never heard of in those innocent days was SWR. I had a Hot Wire ammeter and always tuned for maximum deflection, completely oblivious of the fact that a large proportion of the indicated value was 'reflected power'. I moved to 'high power' when I added a 210 P.A. to my rig.
This is the same kind of a hot-wire ammeter already described in connection with the experimental set, but it reads to 5 amperes. The Grid and Blocking Condensers. Each of these is a fixed condenser of .002 mfd. capacitance and is rated to stand 3,000 volts. It is made like the aerial condenser but has only two terminals. It costs $2.00. The Key Circuit Apparatus.
We had two-wire underground feeders, sent without any plans or specifications for their installation. The station had neither voltmeter nor ammeter. The current pressure was regulated by a galvanometer. We were using coal costing $12 a ton, and were paid for our light in currency worth fifty cents on the dollar.
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