. QST . The No. 90672ANTENNA BRIDGE The Millen 90672 Antenna Bridge is an accurateand sensitive bridge for measuring impedancesin the range of 5 to 500 ohms at radio frequen-cies up to 200 mc. It is entirely different in basicdesign from previous devices offered for thistype service inasmuch as it employs no variableresistors of any sort. The variable element is anespecially designed differential variable capaci-tor capable of high accuracy and permanencyof calibration over a wide range of grid dip meter such as the Millen 90651 maybe used as the source of RF signal. The bridgema
. QST . The No. 90672ANTENNA BRIDGE The Millen 90672 Antenna Bridge is an accurateand sensitive bridge for measuring impedancesin the range of 5 to 500 ohms at radio frequen-cies up to 200 mc. It is entirely different in basicdesign from previous devices offered for thistype service inasmuch as it employs no variableresistors of any sort. The variable element is anespecially designed differential variable capaci-tor capable of high accuracy and permanencyof calibration over a wide range of grid dip meter such as the Millen 90651 maybe used as the source of RF signal. The bridgemay be used to measure antenna radiationresistance, antenna resonance, transmissionline impedance, standing wave ratio, receiverinput impedance and many other radio fre-quency impedances. By means of the antennabridge, an antenna matching unit may beadjusted so as to provide the minimum stand-ing wave ratio on the radiation system at allfrequencies. JAMES MILLENMFG. CO., INC. MAIN OFFICE AND FACTORY MALDEN
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
