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Moving coil receiverRocking armature receiver The construction of this type of receiver is the same as the rocking armature transmitter. When this device is used as a receiver it is similar in operation to the electromagnetic type. An a.c. current is detected in the telephone line and this causes the armature to move back and forth in sympathy with the a.c. current on the line. The armature is linked to a diaphragm which vibrates causing sound to be reproduced. This type of receiver is similar in construction to a loudspeaker, as shown in Figure 58.6. A flexible diaphragm, normally of a plastic material, is formed into a shallow conical shape and a former, wound with very thin wire, is attached to the diaphragm. The assembly is then suspended in the field of a permanent magnet. The coil is connected to the telephone line and detects the a.c. speech current on the line, inducing a change in the magnet field which causes the diaphragm to vibrate, reproducing sound from the received speech signal. 1 Learn the words & word combinations:
2 Find Russian equivalents:
3 Find English equivalents:
4 Answer the questions: 1 Why is each end in a simple telephone system provided with means for transmitting and receiving sound? 2 How do numerous forms of signaling schemes vary? 3 Why can the listener fill in any missing elements and still understand completely what has been transmitted? 4 What is the principle of operation of carbon granule transmitters? 5 What is a rocking armature transmitter? 5. Translate in written form point 58.3.1: PART 2 (58.5 – 58.6.4)
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