. QST . ~ 0 ^ ^ V ^ W7 SLIP. THE. -FlaSTIMKLI^4<3l If you would have first-hand knowledge of thesituation, sweep the spectrum from 7350 to 7500kc. on any Sunday afternoon. We have heardharmonics so thick in this region that somestations couldnt be copied because of harmonicQRM from otheis. Granted that a prol)lem exists, what are wegoing to do al)0ut it? Lets begin by asking wherethis unwanted energy comes from. A harmonicfre(iuency is simply an integral multii)le of somegiven frecjuency called the Jundamenlal. Forinstance, if your transmitter operates on :5705 *609 Park Ave., CollinK-sw
. QST . ~ 0 ^ ^ V ^ W7 SLIP. THE. -FlaSTIMKLI^4<3l If you would have first-hand knowledge of thesituation, sweep the spectrum from 7350 to 7500kc. on any Sunday afternoon. We have heardharmonics so thick in this region that somestations couldnt be copied because of harmonicQRM from otheis. Granted that a prol)lem exists, what are wegoing to do al)0ut it? Lets begin by asking wherethis unwanted energy comes from. A harmonicfre(iuency is simply an integral multii)le of somegiven frecjuency called the Jundamenlal. Forinstance, if your transmitter operates on :5705 *609 Park Ave., CollinK-swood 7, N. J. kc, the second harmonic is at 7410 kc., andthe third is at 3 X 3705 or 11,115 kc. Regardlessof the kind of transmitter you use, whetherhomemade or store-bought, small amounts ofenergy at these harmonic frequencies are presentin your final tank along with the useful energyat the fundamental frequency. Such energy cancreate problems whenever (1) there is a largeamount of harmonic energy generated or (2)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
