The Birmingham age-herald., 1922-09-10

Birnie Johnson. 1910 Ash street, now has a vacuum tube set using a ticker coil and a two-stage ampli-- fer. Birnie made most of his set and 1t is giving him fine results. Among the stations which he hears with this set are Kansas City. At lanta, Pittsburg, Detroit, Louisville. Cincinnati, Schenectady. and many others, including amateur stations.
 Birnie formerly used a two-wire aerial for receiving but just In the last few days changed 1t for a one- wire aerial, which he states gives the best results
 MT. Rhodes Boykin probably has one of the most efficient and most sensitive sets in the city. Mir. Boy kin's set Is for the reception of broadcasted concerts especially. It Is well supplied with amplifiers and has several variable condensers in the various circuits. This enables very fine tuning. This set uses one stage of radio-frequency amplifica- ton and two stages of audio-fre- Quency amplification.
 MT. Boykin, who is one of the many who have reported the person who is constantly interfering with all the listeners. states that he Is going to install another stage of radio fre- quency very soon as the one he has now is working so well.
 He made the entire set himself and it is a very fine one.
 George Johnston, 1457 Milner Cres- cent, who had a very sensitive re- ceiving set month or two ago, dis rosed of this set and mas Just lately installed an entirely new set consist ing of q regenerative set, using a fickler coil and two stages of audio- frequency amplification. This set is bringing in concerts nightly from many parts of the country. He also uses Magnavox loud speaker in con- nection with this set.
 George also has a one k. ". spark sending set, his call being L. P.
 Radio frequency amplification is not yet developed to a stage of per feet use on account of the fact that 1t Is hard to operate No doubt many of you do not know what this type of amplifier is. You have only seen and used the audio-frequency type which amplifies only low or audio- frequency current. Radio-freQuency is placed before the detector or rath- CT before the high frequency current which enters the aerial. is cut in half For this reason one of these ampli-
 
 static and spark stations. Radio fre- quency increases the distance of your receiving range very much.
 We are interested to know what kind of experience you fellows are having with this type of amplifier and would like to get some of your views so the others may take advan- tage of your experience. By expert menting with this amplifier some of mi oh fnd worth while.
 Send this to the Radio Editor, Age Herald.
 In looking over few of the sta tions of the Southside, we find that instead of boys having sets that the men are the ones. There is certain ly some neat work shown In the sets made by these men and every set has an outstanding feature or some- thing original about it.
 The only boy we ran across with vacuum tube set was White Mat thews. 2723 Juniper avenue. He has a short wave set which uses a ticklcr coil.
 ". J. Baldwin. 2731 Highland ave- nue. has a set which was made by the General Electric company. This set uses a two-stage io-freQuency
 
 speakers, one of which is a Magma vox. and the other Is a Bristol Au- diophone.
 B. o. Wise. 1907 Warsaw street, has . vacuum tube set using a tickler coil.
 The main set of tho. sets which we saw was one made and owned by H. H. Gary. 2815 Cypress avenue. This set is unusually neat and eff cfert. Absolutely every thing was taken under consideration when it> was planned and the plans were car- ried out fully.
 This set is for short waves and is made in a beautiful cedar cabinet. It has two stages of audio-frequency amplification and the cabinet Is lined with metal to avoid body capacity effect It is not only lined with this material but the section where the tubes are is shielded from the 1nductance by this metal which is grounded.
 MT. Gary is contemplating the con struction of one of the new Arm strong super-regenerative sets which have caused so much talk and ex- perimental work lately.
 When We go around sometimes to the various parts of the city to see the sets which are owned and operat- ed by local amateurs, we no doubt miss a great many of the sets as most of the time wo do not have any special set to see, but just go to see the sets when we see the aerial.
 If those who have sets and have not been mentioned in this page would write us a line or two about your set, we will be glad to tell tho others about 1t. Address Radio Edi- tor. Age-HeraId. Hasn't that old set of yours ono night just worked like a million? Don't you remember some night you received a station farther away than you ever dreamed of hearing , fGet out emao and nieasure how fer away that station was and send 1t to us. State what night 1t was and what 8tation you received torether