The Birmingham age-herald., 1922-06-11

perfected. This has been a most
 tedious and difficult task and an im-
 mense amount of time, energy and
 money have been expended to ac-
 complish the feat
 The development of the loud
 speaking receivers has been diff
 cult problem. but the experience gained from the experimentation with the phonograph has been of considerable value. Even with the instruments at the present state of perfection it is possible to cause them
 to rattle and to distort the sound
 which it is desired to have them re- produce That is. there is a certain
 strength of "1arput" current beyond
 which the musical and many times the voice, becomes jumbled and in- articulate. Even a suspension bridge
 has been known to collapse under
 the steady tread of marching men.
 Adjustments Necessary
 Another source of difficulty is ex-
 perienced when the detector tubes of
 the receiving sets are not very care
 fully adjusted to determine the ! proper value of the plate voltage and corresponding value of filament cur rent to obtain the dearest reproduc- tion. These tubes are very critical and must be adjusted very closely. i otherwise the music and voice will be distorted. This is especially notice able when loud speakers are used. since the distortion Is amplified at the same time.
 While the amplifying tubes do not require a critical adjustment when compared with the detectors, atten- tion should be given to the adjust ment of the filament currents and plate voltage for the tubes This Is necessary to control the amount of current through the loud speaking receiver and prevent distortion in these tubes as well as in the speaker. Many Messages Received The Alabama Power company has received many messages from per- sons in different sections of the country stating that the programs broadcasted by the company from its Birmingham station had been heard and appreciated. Some of these mes sages are highly congratulatory upon the high character of the programs given and the distinctness with which 1 they have been heard at very distant points.
 Among the more distant points re- porting that they had listened in on | the Alabama Power company pro- grams were Pittsburg, Dunbar ICon- nellsville and Lahmasters. Pa; Chi
 eago. H.; Montrose, Mich; Garnet, ] Kan; Lebanon, McConnellsville, Cha grin Falls and Cincinnati, O.; Middle
 town, Md; Brazil. Ind; Catletsburg
 and Fort Thomas. Ky; Richmond, | Dante, Roanoke and Glen Jean, va
 and many points In the nearby south ern states. 4 ] Following are a few of the mes sages that have been received, which l give some idea of the carrying power l of the Birmingham station:
 I Dunbar, Pa, May My wife and I enjoyed part of your program
 Monday night. I received you on a Westin ghouse No. ? and magnavox-
 not phone. Not so bad for two stages and loud speaker.--L NJ. Lemon.r Garnet, Kan. May S.--W-a heard
 your concert May with two stage amplifier.. Simpsonian set made in Kansas City.-Earl Hampshire' l 'Richmond, Va, May 4.-Your con cert of May was heard here by me I consider that the feat is worthy of mention due to other more power
 ful stations sending at the same I time, also at time when several
 tests were being made by the A. T. & l T. Co. and the G. F. Co, throughout l New Jersey.-W. H. Beli"
 "Hendersonville, N. C., May s.-we want to tell you how much we en- joyed your program tonight. Want to congratulate you on the clear an- Inunciation of your announcer. Your
 musical program was splendid w. H. Bangs I "Cat1etshurg, Ky, May 9.-Your
 broadcasting program of Monday came in strong and clear Hope you will continue these excellent pro- 1 grams.-G. F. Gunnel."
 Lebanon, O.. May 1s.-Much pleased to report that we picked you up the last few numbers of your con- I cert last evening. It tame in with such strength that 1t could be heard all over the house with loud speaker on two stages of amplifica-
 tion.--J. R. Law
 Cincinnati. O.. May 15.-Monday evening. May 15, I received your l program very clear with a detector
 and one-step amplfier. The voice
 was especially clear and quite loud. IF. Gleanor."
 Chicago. Ill, May 1s.--would like I to express my appreciation of the concert you broadcasted last evening. which came through very we'll in
 spite of atmospherics and which was
 received on a home made. one stage (amplifier.--G. H. Pierce"
 Other messages contained similar words of appreciation and congratu- lation. It Is the purpose of the Ala
 bama Power company to broadcast 'crop reports and farm informaticn at
 a later date.
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