. QST . /if. of capacityto tune it to 29 Mc. The signal is fed from theloop to the receiver through a 50-ohm coaxialcable which is gamma-matched to the loop. shows the loop dimensions and the method ofcoupling the coaxial cable to it. The loop diameteris not especiallj critical so long as it is kept small(under about 10 inches), and am discrepancymay be compensated for in the adjustment of thevariable capacitor. The dimension of the coupling * 6016 45th Ave. , Seattle 5. Wash. tap is shown onlj- as a starting value. Furtheradjustment will be required in the tuning the tun
. QST . /if. of capacityto tune it to 29 Mc. The signal is fed from theloop to the receiver through a 50-ohm coaxialcable which is gamma-matched to the loop. shows the loop dimensions and the method ofcoupling the coaxial cable to it. The loop diameteris not especiallj critical so long as it is kept small(under about 10 inches), and am discrepancymay be compensated for in the adjustment of thevariable capacitor. The dimension of the coupling * 6016 45th Ave. , Seattle 5. Wash. tap is shown onlj- as a starting value. Furtheradjustment will be required in the tuning the tuning capacity the author is using aoO-jUMf- fixed capacitor in parallel with a 25-MMf-variable capacitor (Hammarlund .\PC-25). Thistuning arrangement was arrived at after someexperimenting, and has been found to be verysteady and extremely eas\ to tune. The capacitorcombination is enclosed in an old surplus capaci-tor casing (Sangamo type F-2) with the originalcapacitor removed. With a new sealed-in fiber. The loop assembly mounted on WTOTAs car. Themounting is a triangular framework of tubing or rodswith plates that hook over the window frame, and arubber suction cup at the bottom. The loop mast re-volves in a section of tubing. Large rubber bands to theexternal rear-view mirror and door handle help to holdthe assembly in place. * bottom cover, this makes a nice weatherproofhousing. The type of stock used, the method of mount-ing the loop to the car, the dimensions of themount, etc., will certainly varj- with desire andcircumstances. The author constructed his loopand mount entirely of duralumin tubing, thoughmost hunters use copper for the loop. The styleand mounting are shown in the illustration. Adjustment Tuning the loop is a very simple it through the coaxial cable to the an- March 1955 25 tenna terminal of the receiver. Radiate a with a grid-dipper, signal generator,or some other calibrated source, and tune theloop to res;)nance as indica
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
