. QST . epeat Steps 1 through -4 until no furtheradjustments are necessary. The spacing of theturns of L2 may have to be changed if the slugdoes not give enough tuning range in the rightdirection. Remember that minimum inductanceis with the slug all the way in. Inductance alsodecreases as the turns are spread apart. ^Vhenyou are sure the slug will properly align L2,dope the turns in place. 6) Now for the output tank. With the highestfrequency crystal, tune the ganged condenser formaximum voltage at J3. Then tune C5 formaximum output. 7) Try the ^oti;esi-frequency crystal. Tune theganged conden
. QST . epeat Steps 1 through -4 until no furtheradjustments are necessary. The spacing of theturns of L2 may have to be changed if the slugdoes not give enough tuning range in the rightdirection. Remember that minimum inductanceis with the slug all the way in. Inductance alsodecreases as the turns are spread apart. ^Vhenyou are sure the slug will properly align L2,dope the turns in place. 6) Now for the output tank. With the highestfrequency crystal, tune the ganged condenser formaximum voltage at J3. Then tune C5 formaximum output. 7) Try the ^oti;esi-frequency crystal. Tune theganged condenser for a maximum voltage at J3again. Note which direction, if any, C^ must betuned for maximum output. If you had to in-crease its capacity by tightening it, squeeze theturns of Ls together a bit; if you decreased C5,spread L3 a little. You will have to remove thebottom cover to do this; be sure to replace itbefore checking alignment. 8) Repeat Steps 6 and 7 until no change inC5 is necessary for Step The exciter is now aligned. Screw on thebottom cover. After this, all you do is plug inthe desired crystal and tune the knob for maxi-mum output. Frequency deviation is adjusted by controll-ing the output of your speech ampUfier. Theoptimum adjustment is that which gives maxi-mum output without appreciable distortion, ata moderate signal level, in a receiver with a 6-or 7-kc. bandwidth, equipped with a ratiodetector or limiter-and-discriminator. The advertised for a number of the stand-ard commercial ham receivers fill the bill per-fectly. My thanks go to my good neighbor, Andrew , for the photographs used in this article. ,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
