Newspapers / The Roxboro Courier (Roxboro, … / Sept. 6, 1922, edition 1 / Page 2
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PH.'-PAGE TWO " ~ ^=? VACUUM TUBE WHEN USED AS AMPLIFIER It Will Function Thus tor Either Radio Frequency or Audio Frequency. ' Starting today we shall give a Retailed description of the vacuum tube when used as an amplifier. This series, as In the past, Is continuous and If clipped out and saved will be convenient for reference. When tl?e" three-electrode" vacuum tube- was used as a detector, the clr cults associated with* It were such that .where a symmetrical alternating difference was applied to the grid, a symmetrical change in. plate current resulted. That is to say,, the vacuum tube acted as a rectifier. Iii addition to rectifying, the; tube also amplified. 1UC varuiuuu la pmic ClZVUll was " Tv, . .* . where 4,K" is the amplification constant of the tube, times what It would have been* in a -two-electrode tube, for the same potential impressed on the grid. ' . By properly adjusting the electrical constants of tin? circuits associated . with a three-electrode tube, syinmetri* i?- ; r t " * "T" ' ' - |:" / ? ~ O G-f/c/ T^b / < oal variation* t>f grid potential can be made -to product* symmetrical variation In plate current,' which ure "K" times the amplitude of the plate circuit variations of a similar two-elec* trode value with fire same applied grid potential. Tills means that if a three-electrode value he used in ihe proper circuits in a radio receiver, tiie signals van he made to appear 11s though ttie received signal is "K" limes as strong as it actually is. If J two tubes are used with their proper circuits in conjunction with a radio receiver tho received signals will appear to be "K" tiroes as strong as they actually are and *so the apparent strenstth of the incoming signal is multiplied by "K" for each additional tube added to the receiver circuit. A vacuum tube i:?ed In conjunction with i t'"" ***'t that u. Ill cause the piaftcur in exact proportion . to te-lb d grbf V?dtng^?b :? up1' pat-' 'K 'U-J??i'by "K" time* tic' actun" rritl \ op age Variation.. > -idled nn i! iplifler If ihe tube functioning as nn amplifier is u*od to amplify the lucor. inp signal itt radio frc(iuonojr*he# fore. it Is rectified by the dete?t?fr. It Is I'mmiumI a radio frequency amplifier. If the tube functioning as an'aniplifier Is ,m?ed after the incoming rndin fre4 rquencv has been rectified by the detect*.r. it /h termed an audio frequency amplifier. ??? Hi'MiHtmh mi iIn to the i lwinu ltT. 'istlc curve of the three-electrode, vacuum . tube, shown ki Figure 33. ? not lee it* shape. Suppose that a pes Hire?potential?was applied?u*?Ute grid by means of a 4*<T battery so that the tube would function at a point represented by "A" on the * ff^a met eristic curve. If now the applied grid potential from the MC" bat. fesy be reduced bv an amount rep*Dtf(S hy^-B Figure iS Ihe , P^je. <ur Tent will be represented hy B-K^Ob The ether h.?d If ?he? grtd ph*ntt?l be '^hJ* A!^BQnrtiH^C ktih 4 --vm vr-.'--*" . . xfc. ??r?-straight line, then OD will eijuai i* | E, or so-long-hs the working ranpt fulls within straight Urite'portion oj the characteristic eurv^fr aynunc tr!ca> changes in grid potential will cairn symmetrical changes In plate current. From this It can fee seen that If the working point "A" be selected neai the bend of the characteristic curve symmetrical changes In grid potential > 111. not cause symmetrical changes In p)ate current. Since the plate current vnrfatlon In such cas#"would.bear only slight relation to the grid variation in potential, the output of the tube would be distorted. In' applying amplifiers to receiving sets used to plcfcr radiophone stations, distortion is one of the greatest difficulties to overcome. Too strong signals ' Will result In decreased -uuipUflcation. In Figure S'i, If the aff^' piled variation In grtd potentlul were 10 tlraes-?that shown in the example, the plate current would not change 10 times as much, because of the bentls In the cuiVe. due to saturation. Finally, a condition can be reached where the use' of an amplifier tube will decrease tltfe''sigpal strength 'becuuse of the saturation of the tube^ The rectified Incoming signals would be louder without the use of the ampU: ner tub<?, because of the inability of the plate current* of the tube caused by saturation to Increase In proportion to the signal strength. There.ure, In general, two factors that can be taken from the characteristic curve and the second Is the length of the straight portion of the curve. The glope of the straight por m%f-\ 'fi /'Vv " J~1 ?zr / I ?LD - ? V U /' I ^ T\?! / ' ; ?v-i? utur, up uuu ao*n n, i .-a.-h oilier, Wtpft oa# would do Hie rest wouU do, sbowuf tliot even' though the/ fere. joeeg they too would follow a leader. Xn'J Leader Sheep ted the utlieea I aafety and well. RIDDLlS What la It that haa three fact, hat no legs? A yard measure. . ' 1 ' Whar-tctn ts that child to lu owa father. who Is. not Its owa fatliet a aoo? Ills daaghtar. __ What wtad doea a lmt.fr/ aailur like? :?Obc Mlist blows fowl ifoulj , aad (kl'lt* ab"Ul-, A I i I i i , . i ' ?????? ??-+ zzm ! tion of the curve determines the ami pliticatlon -of the tube. The more [ nearly vertical the straight portion | of the curve Is. the greater will be 1 the change In plate current for ^ given change In grid "potential. ^r lai other words, the louder will be the j response in the telephone receivers j corresponding to a given received i signal. The length of the straight portion l>f the curve determines the | maximum variation In grid potential {that wlH cause the tube-to function ! properly without distortion. i ^ igl TIPS TO RAD10ISTS At Munele. Ind.. bacon was I fried by means of a radio rnr- j rent. At lust an explanation for i = tli;.r "frying" nols*. _ , t governor of Pennsylvania by the j ? : = vote of the people, acknowl- | j f edges his great Indebtedness to j j j the radio. A primary coil no j ' I j doubt played an Important part. J j An Inventor of Chicago claims j | \o hove Invented radio apparatus j j \ that permits of successful com- j j j I munlcation with the. splrPs. We hope that the antl-prohlblj ! ttonists ? will not misinterpret 1 j this claim. The police department of " j I'fir Hand. Oie*. lias aahsd Cos aa appropriation for radio reeeiv- | ! ing and broadcasting stations 1 and to equip the police automo L, Idles with radio apparatus. Copper wire. It Is needless to say. will be used. , Lord Nor^hcllffe. famous Engeditor. In speaking of the j future of Journalism. recentlypredicted that radio would have * ha. effect upon the publication of newspapers hfaT will equal j the Invention of the Ubotyps and high-speed press. He said r - that1 radio would undoubtedly - - - \T,T" " ?CIZ.'"'"1' * ' THli ROXBORO COURIER :vei\ii\ft Fairy Tale #yr\ARY GRAHAM BONNER corrtN^ti n ?u'u?? i i<ww umow ?? . m LEADER SHEEP These are the ways of Sheep, "aald Leader Sheep. . All the Sheep listened -to Leader Sheep. "It is true." he said*, "that Sheep are timid. They tire, somewhat like tlie me gibers of the Deer family In ?hut way. . -t They are uXM -very Inuch afraid of a dog. A sheep has been, known to die from having been frightened by a dog. ' "Cut that does not hhppen often, and be us brave as possible. Sheep!" ""Baa, ban, baa." bleated, the Sheep. "We will be as brave as possible, baa. ban. baa." . '. "('lood," said Lender Sheep. "That is what 1 want to bear. Baa, baa, baa, that Is what 1 want to hear." "And you heard it, didn't youl" the Sheep said. "Baft, baa. baa. you heard it." . * "Yes." said Leader Sheep, "1 did. and it made me happy." "uaa. Dna. uaii," tn? Sheep bleated. '"He heard it. and it made bin* happy." MAil Sheep must be good to their little ones just as they have always been. The Daddy Sheep and Mother Sheep have nlw^jrs b?en kind and. Bvreet and loving to the darting little* iambs and so they must, always be." .' They will always be loving to the darling lambs" said the Sheep. "Baa, baa. ban. a Daddy Sheep or a Mother Sheep cannot lielp-but be good to the young." "That is 'right.* said Leader Sheep "That is the way It has always been. There We Can See." nnd that is the way it should always be." *- . ? "And it J? the why.it will always be. baa, ||>*a/' bleated the rest of the Sheep. .* That rejoices my heart," said Leader Sheep. "Ah yes. that rejoices : , !., .;f. 1 -Bj.u, baa, baa." said the other .Sheep. "It rejoices his heart.4' "There, is always only one leader among .1 dock of Sheep." said Leader Sheep. "and as you have chosen me to be your leader, or have* consented jo h-r Pie he your leader, I hope you wTTT a I ways follow me." We will*always., follow you. Leader Sheep," they sufli. "Biih. baa, baa, we will always follow you." "Thrt. rejoices my heart," said Leader -Sheep. * , j T.aa, baa, ban." **srtld the other Sheep, 'Leader Sheep is having a good time, for his heart- is being reJoioe.d every few moments." "That is true." said Leader Sheep. That most certainly Is true.^., "And now, Stieep, 1 wish to tell you tint if 1 go through a fence you must nil go through the fence too. i do not mean of course that you at* to go through the wood port, or wire part of h fence. "But if 1 go through the hole of a fence you must gq through the hols of a fence too, following tne." "Ran. baa, baa." bleated the Sheen. ' "\\> will follow you. Leader Sheep." "That rejoices my heart," *aid ! Leader Sheep. "P?na; has, baa." said the other ! Sheep. ."Once more his heart is re- J JoMng." "True, true." said Leaded Sheep, 1 "on re more is my heart ivjoieinj?. 1 "If.we.see u stone being thrown we" i win Keep aw a;, froffi that parr of i.M. countryside- Oh yes, we will he car?- j fnl. "I will lend ymi to the top of a ! high hill and there we can see >hout I u?." "We will follow you. Leader She*d. We Nvjjl follow you, baa, baa. ba?." Sd -the Sheep all foUowed Leader j Sheep. And whoever he went, they I went:too., - .V The little lamb* ^dnyed and. had I i. . ~ " * ?SEPTEMBER 5. 1022. * PEGGY: DECOYING t * VtGGY. MEN ARC NEVER SO EA B ./ THE WELFARE OF THEs ' BECAUSE I ; THE PEOPLE^ BANK. v?'"" Assets over One Million Dollars! I , BANK OF ROXBORO. | Safety deposit boxes for rent._ Your Account Solicied j .COMMERCIAL PRINTING CO. Pai H. Clay, Manager | "The Shop That Service Built" : W ! ~| 1 FIRST NATIONAL BANK. Capital 570.000.00 Surplus and Profits $30.000.00: ROXBORO GROCERY CO. Roxboro. N. C. Wholesale Grocers?-send us \ your order 1 : CROWELL AUTO COMPANY, Roxboro, N. C. [' Home of the Ford : i SERGEANT <V CLAYTON j The Sanitary Grocery Store Phone iisY ourwantii?^prompt j delivery, DAVIS DRUG COMPANY d?u...... xt r> V/. Make our store your headquarters BRADSHER & CATES Roxboro, N. C. Bring your automobile troubles1 to us - " - MOE GOODMAN |?FwnV Cwirt Street?I Our prices *in?try us I THE Better i - v*-:; ' , "? V DECEIVER WITH A BUMP IS N( ipm SHY DECEIVED A3 WEEN THEY ARE EN ETTE1 iur eve o ;e. merchants should be : YOU RISE AND FALL WITH JACKSON MOTOR COMPANY i Studebakers fleos, Maxwell & Overland Gas and Oils. \V. L. MOORE Fresh Meats and Groceries ."Your trade is solicited?satisfaction guaranteed R. A. SPENCER & SON. Undertakers Superior Service?best prices S. Pr SATTERFIELD Insurance "Old & Tried." You know. harris & burns Roxboro's Best Store Everything for the comfort at the family To buy right, buy at the right place Wlf It I 'PV i. {iTTrDuino Roxboro. N. CGARRETT & WILKERSON Roxboro.- N. C? General Store?anything and everything ROXBORO COTTON MILLS Roxboro. N. C. Fine Yarns' THE RRIXCESS THEATRE, Roxboro. N. C. Amusement for the entire family HAMBRICK & AUSTIN Druggest and Toilet Goods COUB y .. V;:-.,. ; J :;i *. " /-:rV?s%-i^gm ? ? ' 'L-Ui , 1 ' * ''' v^SB .' 4 ' ;'"-:":?aM| D CRIME. DEAVORtNG TO DECEIVE 0THE03 * R. VOI R FIRST THOUGHT THEM. HARRY. RAIFF'S OPPOSITE CO CRT HOL'SE. To Purchase The Right Goods at the RIGHT PRICE. Come to ROXBORO LIMBER CO. Roxboro. N. C. Buy front us and bank the dLfdeference wATKINS & BULLOCK. Koxboro, N. C. Everything to build with. A. L1PSHITZ Roxboro, N. CThe Store of Quality ^ SPOON & LEWIS " Consulting Engineers -Koxboro & Greensboro. N. C. NELLO L. TEER, Road Contractor. Roxboro, N. C. IOHN F. REAMS,. General Cor tractor, Roxboro. N. C. Figure with me before you build ^ THE" COlT-RIEk~ S1..50 a .YearAll kir.ds of Printing ROXBORO LIGHT & POWER CO. Rnxboro, N. C. *Do-it the electrical way." BLANKS & MORRIS. Roxboro. N. C. ^G. W. KANE, Cont ractor / JKR.
The Roxboro Courier (Roxboro, N.C.)
Standardized title groups preceding, succeeding, and alternate titles together.
Sept. 6, 1922, edition 1
2
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