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Updated: May 7, 2025
Screw in a pair of 5 ampere fuse plugs, close the switch and you are ready to tune the transmitter and talk to your friends. A 25 to 50 Mile Wireless Telephone Transmitter With Direct Current Motor Generator. Where you have to start with 110 or 220 volt direct current and you want to transmit to a distance of 25 miles or more you will have to install a motor-generator. The Apparatus You Need.
The four volt heater drew one amp and I had been trying to get it going with a small torch battery. As I became more experienced I began repairing simple broadcast receivers for my friends and putting up wire antennas for reception for people who had bought broadcast receivers. In 1929 Nasos and I were in our final year at the Megareos School.
Here and there the blazing of a group of lights, the ringing of a bell, the response of a volt or ammeter to test, hinted to the masters of the lightnings that their rebellious steeds again answered the bit. Within a half-hour the city's illuminations again reflected softly from the haze of the autumn sky; the clang of the merry trolley, the wail of the motor's siren again smote the air.
Now when the 6-volt battery current is switched on the filament is heated to brilliancy, and the electrons thrown off by it form a conducting path between it and the plate; the 110 volt current then flows from the latter to the former.
For this set you require: one variocoupler; two variometers; one .001 microfarad variable condenser; one .0005 microfarad variable condenser; one 2 megohm grid leak resistance; one vacuum tube detector; one 6 volt A battery; one 200 ohm potentiometer; one 22-1/2 volt B battery; one .001 microfarad fixed condenser, and one pair of 2,000 ohm headphones.
A 100 to 200 Mile Wireless Telephone Transmitting Set With 110 Volt Alternating Current. Apparatus Required.
It was stipulated that five cells, weighing in all 244 lb., should give out 120 ampere-hours of electric intensity; and that at the conclusion of the test there should remain a voltage of 1·7 volt per cell. Very great improvements in the construction of electric accumulators are to be looked for in the near future.
To use a loud speaker you should have a vacuum tube detector receiving set and this must be provided with a one-step amplifier at least. To get really good results you need a two-step amplifier and then energize the plate of the second vacuum tube amplifier with a 100 volt B battery; or if you have a three-step amplifier then use the high voltage on the plate of the third amplifier tube.
The magnetic modulator is described and pictured in this chapter. A 50 to 100 Mile Wireless Telephone Transmitting Set With 110 Volt Alternating Current.
The smallest A or 6 volt storage battery on the market has a capacity of 20 to 40 ampere hours, weighs 13 pounds and costs about $10.00. The B or dry cell battery for the vacuum tube plate circuit that gives 22-1/2 volts can be bought already assembled in sealed boxes.
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