. QST . had, on bothphone and Mobile Antenna Tuning {Continued from page IS) completed unit is ready for testing and adjust-ment. With all turns of the variable series an-tenna inductor removed (tap at top of Li inFig. 4), the externally-mounted loading coil(center or base) should be adjusted for reso-nance at the extreme high end of the band in adjustment will place the transmitter andthe antenna system on precisely the same fre-quency. Temporaiily disconnect the tuning motorfrom the control unit. Adjust balance control Rito its electrical center ])Ositi()n, and adjust thesensit

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. QST . had, on bothphone and Mobile Antenna Tuning {Continued from page IS) completed unit is ready for testing and adjust-ment. With all turns of the variable series an-tenna inductor removed (tap at top of Li inFig. 4), the externally-mounted loading coil(center or base) should be adjusted for reso-nance at the extreme high end of the band in adjustment will place the transmitter andthe antenna system on precisely the same fre-quency. Temporaiily disconnect the tuning motorfrom the control unit. Adjust balance control Rito its electrical center ])Ositi()n, and adjust thesensitivity control to the point where both relaysAl and A2 (Fig. 3) are o[)erated, as evidenced byillumination of both indicator lamps, 7i and h-Then slowly back off the sensitivity c^ontrol untileither one or both relays deenergize. If both relays {Continued on paye 120) 118 NOi^HfA/^ r^/s ^ Wm ©IF ^ iLaiFn^aMn PORTABLE ELECTRONIC MEGAPHONEand AMPLIFIER SYSTEM COST NAVY $I8S(r^YOURS FOR ONLY $©(|^^50. ALL THREE UNITSONLY

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915