. The Bell System technical journal . -^1/ . . Jl rTSL ■ A il _ . • k Lt^li- i i ^^W^rnx \. N An 171 JO cycles y -^ y ■1 -^ -- — 7 {, 1 . i ■> 0 « Fig. 25—\ariation of signal to noise ratio with frequency. Corrected to sameantenna input power ( K\V) in Rocky Point antenna—Reception at New South-gate, England for the two extreme frequencies measured. Both of these trans-missions were efTected from the same station, Rocky Point, and sim-ilar antennae were employed. Comparison is made of the overalltransmission by correcting the values of the two curves to the sameantenna power input,
. The Bell System technical journal . -^1/ . . Jl rTSL ■ A il _ . • k Lt^li- i i ^^W^rnx \. N An 171 JO cycles y -^ y ■1 -^ -- — 7 {, 1 . i ■> 0 « Fig. 25—\ariation of signal to noise ratio with frequency. Corrected to sameantenna input power ( K\V) in Rocky Point antenna—Reception at New South-gate, England for the two extreme frequencies measured. Both of these trans-missions were efTected from the same station, Rocky Point, and sim-ilar antennae were employed. Comparison is made of the overalltransmission by correcting the values of the two curves to the sameantenna power input, the power of both channels being scaled downto t)8 kilowatts, the |)ower used in the telephone channel during theearly parts of the This chart shows clearly the greaterstability in signal to noise ratio obtainable on the lower frequencychannel. While for certain perituls of the day the higher frequencygives a much better ratio, it is subject to a much more severe sunset 490 BELL SYSTEM TECHNICAL JOURNAL. CUT SI234S87B 90nSIt3ije7tJOt S WON VO NOON EST ;9iii}(r9iii3j; Fi([. 26—Monthly avcraRvs of (liuriial variation of sijjnal to noise ratio; Rocky Point, L. I. (2 X S) reccivi-il at New SoiitliKati-, Knuland; KW radiated Power —57,000 t vcles—5480 Km—1)23-24 491
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
