Testing Filter Condensers.

Radio Record, Volume II, Issue 13, 12 October 1928, Page 28

Testing Filter Condensers.

MORE reliable method than by observing the spark discharge is to charge the conde se. with about 90 volts d.e. from battery or eliminator, then wait, say, one minute and diseharge through a voltmeter, observing the reading of the "kick," which will allow of comparison between different condensers. Care should be taken not to allow any leakage to the body by handling connections during the test. The voltmeter must be capable of reading at least as high as the charging voltage. The A Battery Charger. AN Invercargill constructor reports complete success. No trouble is likely to be experienced on ordinary.

CUCU CELE UL ee ho charging. It is when an attempt has been made + charge 20-volt B battery blocks that the voltage has sometimes proved to be insufficient. A couple of dozen extra turns on each secondary would remedy that. Discontinuance of Spark Transmission. NDER the Washington Regulations no new land stations may be established on the spark system, and the use of spark transmitters by land stations is to be discontinued entirely by the end of 1934. The Regulations permit the use of spark transmitters on ships, although after the end of 1929 no new spark transmitter may be installed of higher power than 300 watts, and after the end of 1939 no spark transmitter of higher power than 300 watts may be used on a ship.