St. Louis Post-Dispatch from St. Louis, Missouri • Page 62

The City Circulation of the Daily POST-DISPATCH alone Approximately Equals that of the Daily Globe-Democrat and the Times Combined. race ST. LOUIS POST-DISPATCH RADIO FOR THE AMATEUR AND, EXPERT i i i 1 i i i i 4 5 1 I i i 1 i I AUSTRALIA fig CHANGES IN STATUS OF HOW TO GET THE BEST Post-Dispatch Radio Station KSD Use in Summer Suggestions For the Radio Set Program for Week or June lo AMERICAN BROADCASTS RESULTS BROADCASTING STATIONS Mnndav. Jane 18th SUMMER HINTS FOR RADIO ENTHUSIASTS Hints for Those Who Take Their Sets Along During I Vacation. Daily Schedule On 546 Meters At 8:40, 9:40, 10:40 11:40, 12:40, 1:40, 2:40, 4:00 Broadcasting of the opening prices, midsession and closing quotations of the St Louis grain markets, livestock quotations, supplied by Market News Service, IT.

S. Dept. of Agriculture: Liverpool and New Tork Cotton markets; New Tork stocks, bonds, and money markets; hay and clover; poultry and butter market; metals market IT. S. official weather reports and forecasts, and news bulletins.

8:00 P. M. Special programs of music, short addresses and other features. Details announced daily in the St. Louis Post-Dispatch.

rT Jk loop I ft N. ARRANGEMENT rr ,4, 4 i 1 QUESTIONS AND ANSWERS All Queries Must Be Accompanied by the Xame and Address of the Bender. n. Signals Heard Clearly 't-V tinctly in Test Cocfc by West Coast Amatc The first successful rtre the Pacific Ocean oa chs been demonstrated acoordia.J ports that American tau signals have been heard to This news In the form ofr gram from H. K.

Love of Gut less Institute of Australia ca-flurry of excitement amtrax tors in California and othartr' states many of whom mad records in the transatlantic fr last year. Reception of amateur sin: been reported from time opera tors on ships off Uw Australia and China, ont vessels having been at incfe Chinese port. Xever until tti has there been any orgmni to transmit signals across tk Ocean on a definitely tat schedule. The tests were made at fWre tion of Australian amateur hearing of American DX reea. sired to demonstrate that tlMf able to receive signals from Tj members of the Americas Bj lay League.

America wu Australia to listen. Although no long-distanet were broken, it. is sigaifkia American signals were heard and consistently and complet mation from the receiving ni show that some amateurs euti Rockies may have got their over unawares. The arrangements for trtsm by American amateurs wu fa I of a special committee headi J. Portis of the Long Eeaca Club, and It was largely throrj efforts that Australia has B0 tered the "amateur radio let; nntlons." Safety First.

To eliminate all fire constructing outdoor aerials, sure that the wires do not eroi or tinder any high tension Eu as railway feeders, trolley i etc Locatiorf must also 1m that In case either the Kb aerial is wrecked by wind or i no contact between them ss possible. Radio and Its Advancm The Bureau of Staafarj Washington, D. is a ek house for all kinds of hArs about radio progress, jt41 technical and scientific papm issuing bulletins describing ft rtruction and operation 'f types of simple receiving Mt can te made in the home. ual research is carried on by of the bureaus. Quality Brines ResalU In buying sockets, rheostat condensers and telephone re bu the best that can be affoi the best possible results are for.

battere: 22 -volt: Jarre aiie Murdock Head Ft Pupreaaltle witk adiratuwe Bind: tons ia clear, load ing. Kvry pair Is faxr- anted. Special pair vt" Largest Stock of II Phones in the CE; Baldwin Type 'C," per pair -V Baldwin Loud Speaker Unit Maxaloud Spe Fjwlaiiy priced at Sterling Battery Cfc from av ln" ted to aaUafaetloa. Special Mall Ordr Fin. UNIVERS SUPPLY CO.

203 N. Browhrc: BETwrEtrx nE ati our 8:00 P. M- Broadcasting light opera "Prince of Pilsen. by Gustav Luders. from the Open Air Municipal Theater in Forest Park.

St, Louis. Tuesday, June 19th 8:00 P. Program by choir of St. Koch's Church. Members of -which are: Irene K.

Hawley, soprano; Louise K. Schatxman, contralto: James A. Rohan, tenor; Wallace C. Niedringhaus. barl-tone- Wednesday, June 20th 8:00 P.

M. Recital by C. W. Williams, of Eustis. Florida.

P. M. Concert by Rotary Club Band of Independence, Kansas. 110 pieces. Thursday, June 21st Broadcasting Si.

Louis Reception to President Harding, Secretary of Interior. Dr. Hubert Work; Secretary of Agriculture. Henry C. Wallace: Secretary of Commerce, Herbert Hoover; -Assistant Secretary of War.

Dwight F. Davis. Coliseum, 8 P. M. Friday, June 22nd 8:00 P.

M. Broadcasting light Opera "Prince of Pilsen," by Gustav Luders. from the Open Air Municipal Theater in Forest Park. St- Louis. Saturday, June 23rd 8:00 to 8:45 P.

M. Organ recital, orchestral concert and specialties at Missouri Theater. aerial and ground terminals of the vario-coupler. C2) Xo. (3).

Any of the three-element amplifier tubes will work satisfactorily. Q. I am using a 23-plate variable condenser in my receiving set. Will a 43-plate sgive more satisfaction? H. H.

A. With no other details than you have given, it is Impossible to advise. Q. I am using a 6-volt storage battery on my receiving set. Will it be necessary to change rheostats in order to use WD-12 tubes? J.

T. B. A- Xo. The present rheostats you are using will work with the 14-volt battery which is necessary with "peanut tubes. Q- (1) Would a 43-plate variable condensed be required using an outdoor antenna 35 feet at the highest point, and sloping downward at the end where the lead-in Is connected? (2) Does the duo-reflex set require a "ground" for operation? (3) What Is the resistance of the Bradleystat? (4) Is a vernier condenser connected in series or parallel with the larger condenser? (5) When an outdoor aerial is used how is the jack for a loop aerial disposed of J.

W. A. (1) Tou do not give the length of the aerial, but the probability is. that it would. (2) Xot for local reception.

(3) The original type having two connections will carry one-naif to one ampere. The new type, which has just been placed on the market, having three connections, is adaptable for all tubes, on any voltage up to six. C4) In Varallel. C5) The nsual practice is to nse a plug, the terminals of which are connected to the secondary of the vario-coupler. Q.

Please tell me what connections I can make on a crystal set to get long distance? (2) What will be necessary to put a loud-speaker on a crystal set? h. O. A. (1) Long-distance reception in the summertime with a crystal detector Is practically Imposlble. 2) Two stages of audio-frequency amplification.

Q. Which is the best as a detector, the VD-12, or the UV-199? (Z? tub the longer Iif-? CS) Which consumes the less battery current? w. B. A. (1) Many enthusiasts prefer the WD-12 as a detector and the UV-199 as an amplifier.

(2) The life of any tube is largely dependent upon the care it receives. Burning the filament more brightly than necessary shortens the life of any tube. (3 The UV-199. Q. What size of wire is recommended for the ground lead? I.

C. set. seven strands of Xo. 22 stranded copper will serve very well. Q.

What size of loop is best for a set using the 'Erla" circuit? A- For the lead to the receiving L. M. A. most satisfactory loop aerial measures approximately 30 inches square with center cross-pieces 42 Inches long. Twelve turns Cabout 12 feet) of bare or insulat- -u copper wire is wound the frame, spaced one-half inch apart.

Many Uses May Be Found for of radio-frequency or a reflex set are employed. An excellent loop is one 30 inches square, with center cross rieces 4 2 inches long. This frame is wound with twelve turns, (about 120 feet), of bare or insulated copper wire, preferably stranded wire. Electric light extension wire will serve nicely for this purpose. Another type of marine antenna is the trailing wire type, which works equally as well with the boat under way, or at anchor.

"Waterproof insulation is the secret. Any heavily insulated. wire will work well for a time, but rubber covering will withstand water the longest. The free end of the wire may be insulated with sealing wax or with tape and paraffiae. Rubber tape is decidedly preferable, and it can be permanently fixed by vulcanizing or applying "cold patches' -of the kind used in making emergency inner tube repairs.

The trailing antenna used in this way may act as a loop similar to that of a submarine, but it has more of the nature of a counterpoise. A practical length is 75 feet. Greater length will bring in slightly stronger signals, but tuning will be more difficult, and if long wave broadcasting stations cannot be heard, twenty-five additional feet may correct the trouble, however, if a splice is made, the joint must be made waterproof. Again the "ground" for this installation may consist of a square foot of metal surface in contact with the water, or on power boats, the "ground" connection may be made to the engine or some convenient metal part of the boat which is in contact with the propeller. A strip of copper, two or three inches wide Tunning alogg the keel would make a perfect "ground," but in most cases it might be considered an extravagance.

If the installation is set up beside a lake, the submerged type of aerial and water "ground" may be employed and fair distances covered. On the beach the aerial may be supported by two poles from four to six, feet high above the sand, and the "ground" obtained by running a wire down to the water, and attaching it to a metal plate. The nearest perfect antenna is a wire kite string, and while it depends upon the wind for its support and is therefore not always reliable, it has been tested and found practical for marine aviators who wish to call for help when they are forced to land upon the water. The automobile tourist has the least problems. His aerial may consist of a loop, or simply a 125-foot length of wire which may be suspended in a tree beside the road.

A convenient method is employ a reel on which this temporary antenna is wound when not in use. The frame of the car will serve cs a "ground." but in thi3 case the aerial wire should be at least between 160 and ISO feet to offset the less ca pacity afforded by the metal part of the car. It might be well, how- ever, to carry a sharp-pointed iron rod which may be driven iruo moist tartn. The tourist may ue six-volt tubes and depend upon the battery in the car to provide the necessary c'lrrent- The daytime travel will mere than counteract, the drain on the when it is desired to usi the receiv ing set. Eight Class Stations Transferred Two Changed to Class.

Following Is a list of- the cfess stations transferred from class during the week ending June 9: 4 WOAK Collins Hardware Frankfort. Ky.1250 WTAI Huphes Radio. Syracuse. X. 1220 KTFB Jenkins Furniture Boise, 1250 WCAG Randall.

Clyde New Orleans, La 1120 TOW St. Louis ITnfver- sitv. St. Louie. Mo.

1150 KFFO Fraith. E. H. Hillsboro. Ore ....1310 TTQAB Southwest Missouri Stat Teachers' College, Spring-field.

Mo 1270 WAAN Vniversitv of Missou- ri. Columbia. Transferred 1 mm Class Class 'B." TVLW Crosley Mfg. Cincinnati. 0 970 WDT Shipowners' Raxiio Pervic-, New York, X.

740 240 246 240 268 261 229 236 254 10 100 10 50 lOO 5 10 50 to 309 600 405 500 SPECIAL AMATEUR LICENSES Future Special Licenses to Be Issued by Each District Radio Snpervisor. No new special amateur licenses have been Issued It has been decided by the Department of Commerce that hereafter District Radio Supervisors will issue them insead of the "Washington office. The wave lengths assigned to special amateurs are between 150 and 220 meters for continuous wave telegraph. Regular amateurs operate on wave lengths between 150 and 200 meters. play the piano, but it was worth while.

So is time spent in mastering the capabilities of the receiving set. The Wave Lengths Above 430 Meters Since the longer waves have been opened to broadcasting by the Government, it is desirable to be able to receive them. It may be that the receiver on its present aerial is not capable of tuning in these longer wave lengths from about 450 meters to 545 meters which have been in use since May 15. Generally the same condenser placed between the aerial and groufld binding posts or terminals, which has already been mentioned, will serve also to enable picking up the longer waves. The larger the value of the condenser, the higher the wave length which can be picked up.

There are 10 good rules for broadcast listeners: 1. Don't try to hear Australia in midsummer. Be satisfied to enjoy the nearer stations most of the time. 2. Don't be disappointed if an occasional storm interferes with your summer radio evening.

There f.ro many fine concerts coming. You can't expect to find a pearl in every oyster nor to receive a recordTbreak-ing concert every night. 3. If you want louder signals, use a longer aerial, more tubes, higher plate voltage, more sensitive loud speakers, and more careful tickler and receiver adjustment. 4.

A pleasant signal filling a moderate size room should be enough lo give satisfaction. It is not worth while producing signals which deafen the neighbors. It is wasteful to insist on tremendous signals which are generally less pleasant than moderate signals. 5. If your local station comes in too loudly and drowns others out, a smaller aerial will help in tuning it out, with a smaller condenser connected between aerial and ground.

And if all measures to get rid of the local station fail, why not enjoy his concerts? He is working hard for you and it is nobody's fault that you are so close to him that you are bound to hear him. Broadcast stations have to be closer to some people than others. 6. For the new longer waves above 450 meters, use a condenser connected between the aerial and ground terminals of your set. A little patience in learning to handle your receiver yields rich returns in satisfaction from tine signals.

Remember that "Rome wasn't built in a day" and keep on getting more and more familiar with your set and how it works. i S. It is a good idea to read the radio column of a newspaper or a good radio magazine or two. It helps you to know how your set works and keeps you up-to-date in radio. Information of this sort is an aid in getting the concerts loud and ciear.

9. Ask your radio dealer for advice: he can probably tell you what you want to know and will be glad to do so. The manufacturer of your set is also willing to help you get the desired results from its use. -A-Do not throw away the direction sheets cr booklet that came with your eet and with the tubes. Read all such material carefully now and then.

If you have lost the direction sheets, write to the dealer or manufacturer for another. The direction sheets answer, most of the questions which have been ruszling you and preventing you from gettinfe the best out of your set- Hear Atlanta On CfVRt-nf w. 9. L. kauna.

5-6 tnis fsfctsia. Wtdtita. Km. IcaaUrterL Sug-gestions to Help Those Who Are Not Getting the Most From Their Sets. By DR.

ALFRED X. GOLDSMITH Of the Radio Corporation of America. There has been rapid progress in broadcasting recently. Instead of the old crowding of all stations on the two wave lengths of 360 and 400 meters, the stations are now assigned to definite wave lengths covering the wide range of wave lengths from 220 to 545 meters. This has greatly increased the possibilities of broadcast reception provided that the listener uses his receiver in such a way as to pick any desired station.

Difficulty has been experienced by some in receiving the longer waves particularly. New stations have been established in certain localities thus producing very-powerful signals in the receiving sets of nearby listeners and somewhat interfering with the reception of more distant stations while their local station is in operation. Then, too, a few stations have shut down or transferred thereby requiring the listeners to get their programs from more remote stations which, in turn. involves some modifications in the receiver or in the way in which it is handled. And, finally, summertime has come with its occasional diminished signal strength and "static" or electrical disturbances of distant reception.

Fortunately all of. the difficulties mentioned can be easily overcome to a great extent by a little care aid a proper attitude. The enjoyment obtained from radio broadcasting by the listener will be much increased if he will keep in mind and properly apply a few simple facts which are well-known to all skilled radio workers. Summertime Reception. While excellent radio reception ie frequently possible during the summer months, yet the best long-distance records come in the winter.

Signals are not quite so loud in the summer, and electrical disturbances 6uch as lightning storms are naturally more common in the summer, and interfere occasionally with concerts, particularly those received from dis tant points. A reasonable attitude will help the listener here. He should remember that he cannot expect every act, in even the best vaudeville performance, to be tremendously amusing and just what he wants, r.or can he expect the weather every day to be clear and pleasant. Similarly he must not expect every day to be just right for long-distance radio reception. Now and then a summer storm may interfere both with radio and picnics.

The listener should become acquainted with his local sta tions and enjoy them during the sum mer, and be satisfied with the longdistance records he has made or will make in the winter. In other words, he should get the best there is in radio during all seasons, and, above all, he should be reasonable. The Distant Listener. If the listener lives rather fax away from all radio broadcasting stations which he wants to hear, there are several things he can do. He can lengthen his aerial wires and Increase their height from the ground.

Both of these measures make the signals louder as a general rule. He can add an audio amplifier unless, of course, he already has this Instrument. He can also increase the voltage of his amplifier battery or plate battery up to 90 or even 112 volts (that is, to four or fiye of the usual 22 -volt units or blocks). He can use a more sensitive loud speaker, or content himself with head-set operation. He, should also tune more carefully so as to get the very loudest signal which his set Is capable of giving.

If there is a tickler adjustment on his set, he should learn how to use it so as to get full volume of signals. And he should remember that the good results he will then get are going to be even better results in the winter. THE NEARBY LISTENER If the listener is very near a pow erful broadcasting station, he may get excessively loud signals from that station and have difficulty In picking up other stations when the nearby station is in operation. In extreme cases it is not possible to get the distant station at all under such circumstances any more than it is possible to hear a whisper from a distance when someone else is shouting nearby. Still a good deal can be accomplished by some of the following measures whioh should be tried.

The listener can cut down the size of bis ar.tenna or use a small indoor antenna having length between a foot or two and say thirty feet. A few trials may be necessary to find the best length of indoor antenna in such cases. When an antenna 1-sj, than 30 feet in length is usfd a small fixed condenser of five- ten thousandths of a microfarad f.OOOi rr.fd. should be connected between the aerial and ground binding nosis or terminals of his t. This will permit the reception ef waves of the same length as possible with an outdoor antenna.

The listener should experiment until he gets the best signals and the greatest case of choice of one station i or another. A little re quired to get the desired results ln some cases. It should be remember-' ed that no one ever learned in five minutes to run an automobile skill-; fuly through heavy traffic. Some- times the traffic In the ether is heavy, and it may not be easy at first to pilot the desired i through the receiver. Paderewakl took quite a little time to learn to- BY STTART C.

5IAIIAXAV, Radio Staff, I'ot-Iipatl. No ardent radio enthusiast 'will want to pack up his set while he leaves the city for the summer va- cation. Undoubtedly, the summer months offer equally as many. If not I more, varied opportunities for the full enjoyment of listening-in, as do the winter months. While it Is true, that the same i long distances cannot be covered in summertime as during the cold months of the year, yet nothing: can i compare with the pleasure a radio eet can add to a campfire, or to gliding smoothly along in a canoe cr boat, listening to summer opera or a concert, clear, sharp, and clean cut.

In anticipation of the demand for portable sets, and with the advent ef vacuum tubes which efficiently operate with one or more dry cells, a number of manufacturers have placed on the market, sets which axe not only compactness itself, but which compare favorablydth more elaborate apparatus. Xo longer need the outdoor enthusiast be isolated from the' world at large for weeks at a time, while pursuing his favorite outdoor sport or hobby, if he takes along a portable radio set. The first question to arise is. what kind of a set Is recommended? This depends entirely upon the use to which it is to be put. The auto-mobilist on tour will obviously need a different set from the farmer who caters to summer boarders.

Likewise, the permanently Installed set in a motorboat will differ from the set ta be moved about from the canoe to the camp, or seashore home. Complete sets may now be purchased which require but a few moments to set into operation, or the Ingenious radio fan may purchase the necessary parts and assemble a set which will give equally as great satisfaction as the complete set purchased outright. The saving in cost Will approximate one-third. If permanently installed in the mountain home or lodge where a semi-permanent aerial may be erected, the regenerative set which brought pleasure during the winter may be removed and set up the same as In the city home. Instead of the storage battery, dry cells may employed If vacuum tubes such as the UV-199, TJV-201A, WD-11 or WD-12 type-- are substituted for those of the six-volt type.

Many enthusiasts believe the UV-199 and UV-201A tubes to be more efficient as amplifiers than as detectors. Where volume is desired. If Intense amplification is wanted, such as for dancing, the type of loud-speaker requiring an external C-volt battery should be provided, but the only solution to the charging problem In this case, would be to lake the battery to the nearest town to be recharged. Some suggestions are here offered for the benefit of those who take their sets to camp or summer home in anticipation unforseen of difficulties which may arise In connection with -erecting the antenna, and ffect good ground connections. The simplest and undoubtedly the best aerial Is one single wire stretched between two trees, or a tree and the cabin.

The aerial and lead-in should be betweeji 90 and 115 feet In length, and may be composed of seven strands of Xo. 22 copper wire, either bare or insulated. A temporary antenna is very apt to come into contact with trees and bushes, and for this reason, rubber-covered wire would be preferable. If a good "ground- connection cannot be obtained, the counterpoise may be used. In fact, results with the counterpoise and aerial are equally as good as with aerial and ground, the only objection beine that more wire is required, and fc Aio the two extra insulators.

i Lav scneme ionowea in putting up the aerial and counter- be temped a "double aerial. is illus trated in sketches two and three. The two wires should good best run apprexi r.riT respective terminals are con nected to the and posts of the receiving set. A hilltop is the ideal place to erect this type of aerial, and if the set is located right on the top of a fairly steep hill. 100 to 125 feet of ire may be run in each direction i and excellent reception be obtained r-tW an a.H,l IZ rrcting- an aerial on a boat, small vaoht or cno jacnt.

or canoe. Ahe mast should Jgure 4 shows the method of v. 4. 4S-plate variable condenser mav be EKMiurr to enable nt nected in this manner, to rMn ating on lone wavelengths. Tne ground consists of a metal Copper attached 1 isponded over th- ctnM.

plat (preferably to a wire and su runwil of the boa makes an excellent "irround," and probably accounts for the goti re- suits btslnable mith an installation of hU kind A loop aerial may be used, but it octy possible when several stages angle to each other, and th V. they in opposite directions. Each is matelr 100 feet long. nd i i i i i i I the Self -Contained Portable Set. AMATEUR TO OBSERVE HOW AURORA AFFECTS RADIO Operator on MaoMillan Polar Expedition to Cheek "Phenomena and Ita Relation to Wireless.

The first serious attem. to determine the effect of the Northern Lights upon radio reception and the possible relation to static, fading and other phenomena connected with broadcasting will be made next winter by D. H. MJx of Bristol. who is to accompany Captain ronald B.

MacMillan to the Arctic in the employ of the American Radio Relay League. The MacMillan party expect to make their winter quarters either at Flagler Bay near Cape Sabine or at Jones Sound. The former is located about 540 miles nort: east of the Magnetic Xorth Pole. From this point of vantage inside the circular aurora. Mix will listen for radio messages from fellow amateurs at home.

He will keep a record of the intensity of reception through this peculiar natural phenomenon. This information is to be obtained at the request of Dr. J. H. Delinger, chief of the radio section of the Bureau of Standards.

Whether the disturbances believed to be caused by the aurora can be controlled remains to be seen. In any case, study of this data may reveal the cause of electrical effects heretofore unexplained. INCREASE IN AMATEUR LICENSES Pat Five Show an Increase of 133 Stations Ninth District Has Greatest umber. Lest sone fans believe that the reception of broadcasting is the only popular phase of the radio art, be it known that amateurs are still entering the game of "key pounding" at the rate of nearly 3 00 a month. Since Jan.

1 13 34 amateur licenses have been granted by the Department of Commerce, and on June 5 there were IS, 23 2 such stations in the United states. The distribution of amateur stations by districts June a was as follows: Headquarters. Total. 1 Boston 2,490 lorK 2.629 Baltimore 1.9 94 Xorfolk Xew Orleans San Francisco 444 941 2,172 901 2,932 7 Seattle S.Detroit 9 Chicago 3,729 Total 18,232 Naval Airships Win Have Radio Compasses. Plans for equipping the two new naval rigid airships with radio compasses so that they can navigate in darkness or in fog are under consid eration.

These are the great ZR ROW Puildine. It is believed tnat ttJe radio compass installations can ne made satisfactorily, and that this feature will prove a mliiaM asset for the efficiency and safety; of both personnel and material) through assisting the accuracy of naviirat'on. The location selecte was adjarert to th observation pi iu if this v. he the first! Xtie Latvim Main Post and Tele- nh Adrrlnistration announces! that radio Otters to the rray be filed, at all United Latvian i I i .1 i I I i II i 5 Q. (1) Is it true that a Reinartz circuit is difficult to tune? (2) Is a vernier necessary on ll-plate condenser in the Reinartz set? (3) Will a -peanut" tube operate the above" mentioned circuit? P.

W. A. (1) Any set vafaich is highly selective requires more care and patience in tuning than the kind which tunes broadly and easily. (2) The set will function- without it, but much finer tuning may be ebtained with its use. 3) Xes Q.

Can an aerial be too long for crood results? O. M. A. An ideal aerial for broadcast reception is a single wire 90 feet long connected by a lead-in approximately 35 to 40 feet in length. Q.

Is a two-wire aerial SO feet high and 52 feet long satisfactory for receiving local broadcasting? R. B. A. This will depend upon the receiving apparatus used. It would be advisable, however, to increase its length approximately 50 feet- Q.

-1) What is the pay of a radio operator on shipboard? (2) Where can I get a book that would help me to Qualify for an amateur license? P. A. (1) The pay is dependent upon the experience and ability of the operator, as well of the class of work required, and ranges from $60 per month upward. (2) Consult the radio dealers whose advertisements appear on this page, for books on the theory and principle of radio. Q.

(1) Could a UV-200 tube be used instead of a L7V-199 in the portable set described in the Post-Dispatch of June 2) Would two variable condensers be necessary if an outdoor antenna is used? (5) Can the and batteries be outside of the cabinet? C. "W.B. A. (1) Tes. but the UV-200 tube requires a 6-volt storage battery for satisfactory operation.

(2) Xo. (3) Tes. Q. Am using a 4000 meter loose-coupler in a single tube regenerative set. Will two loading coils wound with 1500 turns of Xo.

22 wire, on a four-inch tube enable the set to respond to signals transmitted on meter wave length? L. E. B. A. Xot with any degree of efficiency.

The only practical way to work on 20,000 meters is to use honey comb coiis, plugging in the correct coil for the desired wavelength. Q. I have a vario-coupler, 43-plate variable condenser and crystal detector. Local broadcasting signals are not as loud as they should be. The variable condenser ls shunted across the rotor of the vario-con-pler; is that correct? (2) Would the addition of a vernier attachment to the variable condenser be of any help in the tuning? (3) What kind of a vacuum tube should be used for the addition of one stage of audiofrequency amplification? R.

D. W. A. 1) Too would probably get much better results by connecting the variable condenser across he Summer Static Overcome ANTENELLA Yo aerial or anienni needed. Eliminates aerial, ostsids wiriasr liehtBic arreatera and ether invr3-veniencea inda-cire to atattc.

Pius Astenelia is any Xig'Stina' Mckc and Qu can Radto la ist room la your houM. No current consumed. New Improved Antenella NOW $1.25 ONLY At iMitr1 hr1i sl prehae pr, and rsa will 106 r-reatt At rase. lark ffrsx. rrestsTtsn ro.

Izz. tnrven r. I uviiufu.uu itii urreni iwen designed to use a plugr tKe-which will enable observation, to K. of a miniattlr4, in of A Oil fl (nl supplies The final hint is to tate ncn.g!tim' a radio compass has been sue-extra and batteries tpsr- installed upon a lighter-daily when the smaller tubes are 1 than-air craft. usei).

as well as spare vacuum tub3 and several extra insulators. It is I Ttarflo Tytt--t FVorn I atria. AT REDUCED PRICES Our stock always new and up-to-date radio experts at your mailed to Berlin, whence thfv EBUX(i 300-OHil HK.I1I IT Imperial TK IE-TONE 3UMM)HN II K.I SET Soov-tal UHKUl FLLK aj typ. bajtrtite ARJUAL IKE lttO-ft. Iracth.

KAIU aTIM or THE WOKLD vakubLe condensers 13-pfaaie $3.95 $3.95 $2.45 49c 10c $1.95 Ile Or Aateaetl Aerlml 95c RIBBKK FAT EU 4V1 Wiea. X-l faa, tfetrk. FT DELTA 3-lolt Midt QJ Paat Ta. TRITON TE LUtD SPEAKER ERA CO WATEtEa RACK. KATTF RT tl IS 19 Si 21 fljV voir by sf ACDIO ad "RADTO ERRMl-TRANrOREKS -Ra 4H ta 1.

also well worth while to add 43- variable condenser the "spare" parts and if signals are not ka-d. try connecting: it ir. series ar.d maka an inspection cf the aerial 1 4 Poor connec-j m-r oer eery joint j.Iju 1 nearly electrically perfec as it can be made, and always befo ore joining? tW irM" ure to fim scrape them ciean and brirht Cau-c for Most of the squealing heard he' is due to errerer eration tf jtub ost-UUUng ls impossible to get intUi4bI signals over radio- phocs. 1 Ifjbe 1 will be" transmitted by wire'ess to orK and from there to the mus. ln neusn.

trench and utmsc. me cf.srtM for- 35 centimes ner word, plus' ejual to 1 French franc) ground fe per wire. Rht ith Fire After a ra lio set is trstjilled it best to call or write the insurirfce company which holds th fire innr-j ar.ee policy on the house and tell them about the equipment. The--- will arrange for an Inspection fcv th i board, the usual fee for which is $1. 0vr Nwk af radia awrrhaadfa.

ta-tarf C. V. 1 traa at I 11. and Ita at a dtomit mail ardors, add) aaataca. C.

O. D. arder. a-erptrd with t'm rtrai.lt. SL Louis Radia Saltago 1103 PINE STREET.