. Practical wireless telegraphy; a complete text book for students of radio communication . uble is in the cords or inthe bobbins can be found out by placinga jumper around the cord tips at thepoint where they enter the receiver second pair of telephones which areknown to be in working condition arenow connected in series with a batteryand the defective telephones. If aclick is obtained when the circuit is made and broken with the cords of the first telephone shunted by jumpers, and no sound isobtained when the jumpers are removed, an open circuit exists in the receiver mag
. Practical wireless telegraphy; a complete text book for students of radio communication . uble is in the cords or inthe bobbins can be found out by placinga jumper around the cord tips at thepoint where they enter the receiver second pair of telephones which areknown to be in working condition arenow connected in series with a batteryand the defective telephones. If aclick is obtained when the circuit is made and broken with the cords of the first telephone shunted by jumpers, and no sound isobtained when the jumpers are removed, an open circuit exists in the receiver magnet will therefore require rewinding. (d) Fading of Signals During Reception.—li the signals from a distant transmitterswing in and out periodically or irregularly, the trouble is likely due to leakage in eitherthe transmitting or receiving aerials. The transmitter antenna, for example, may swing into contact with mast stays duringthe rolling of the ship and thus divert the antenna current to earth. The remedy for thisdifficulty is clearly beyond the control of the receiving CONDENSER Fig. 332—Showing How to Locate a Short-Circuit in aVariable Condenser. LOCATION OF TROUBLES 317 The leakage may also be found in the receiver aerial which may swing into contact withthe ships stays or other nearby conductors. Loose contacts may exist in the antenna wires at the receiving station, the joints ofwhich may not have been properly soldered. This would occasion very serious losses inthe strength of signals. An imperfect connection in the telephone cords may cause thesignals to disappear intermittently. (e) Weak Signals.—If the signals are unduly faint, it may be due to one of severalreasons: (1) The receiving station may be nearly out of range of the transmitter; (2) The transmitter may be operating at reduced power; (3) The oscillation detector may be out of sensitive adjustment; (4) The primary and secondary circuits of the tuner may not be in resonancewith the transmi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
