The Birmingham age-herald., 1922-04-09

OO4ND1A Al 4bA0 C1 Q reception of music you will have to use a coil of 75 turns in the primary. coil of 30 turns in the secondary and S5 turns in the tickler.
 Parts for HOneycOmb Set
 Questit n-G) Giv me directions for assembling a receiving set com posed of honeycomb coils ana vacuum tube. What other articles do l need? >2) Is a tickle coil incor- porated in a honeyeomb coil? D What sized coils do I need to obtain wave length of about 1000 meters? ,-L. F c.
 Answer 1. With 8 honeycomb coil 1et you will need a special mounting for the coils. These mounts are so ar ranged that the position Of tho pri- mary and the ticker can be adjusted and their relationship with the secon- dary changed. In addition to this mounting and the necessary coils, you will need 8 .0015 condenser for the aerial, which will be placed in series with the primary coil and the aerlia. and .001 mid. variable con denser, which will be shunted across the secondary coll. You will also need grind leak and a gird conden- ser, one pair of 5000 ohm telephone receivers and fixed condenser for same, one 6-volt storage battery, two 22E B batteries and one rheostat for the storage battery.
 Changing to Radio Frequency
 Questiol-Haye a two-step audio- Frequency amplifier and desire to change into a radio frequency ampli- Tier. Am anxious to know what would be necessary for the change. mere seems to be an uncalledfor amount of Cracking (similar to ststic) In my phones. The noises are present with my aerial and ground wire disc >nnected, but in a modified form.-W. M T.
 Answer-It will be necessary for you to change tho amplifyinE trans Iormers and put in open core trans formers, specially tuned to the short wave length; but in view of the fact that radfo-frequency amplification Is not yet success, do not think 1t would be worth while or would not pay you for your trouble to make the change. The cracking noise in your phones is probably due to loose connections or weak batteries, per- maps both. It might be eliminated by reducing the amount of current pass Ing through the filament of your am
 
 sesl that you try new B batteries.
 Installing Light Device
 question: am installing a ugbt- ning protective device. Do I put this Tn series with tho aerial and my fn- strument, or how do connect them !? U. H. l.
 Answer-You should fasten this de- Vice on the outside of your house. and attach the aerial to the terminal which Is marked "aerSal" and then your ground connection to the ter minal marked ground" Having done thls' you should next take a lead rom the terminal marked "aerialp Into your house and connect that with the terminal on your receiving apparatus marked aerial" You vii also need ground connection for your Instrument, but when you have done this the set will be ready to operate, and since the protective de- vice you are installing has been passed upon by the National Board of Fire Underwriters 1t will auto matically protect your instrument and take care of the situation during an electrical storm.
 How to Adjust Receiver
 question: have an R. c. regen- erative receiver with vacuum tube detector and two stages of amplifi- cation The directions which came with the set are not very explicit. How do I operate this set?-F. F. w.
 Answer-As soon as you have made all the necessary connections, as shown by the diagram accompanying the set, the best way to proceed is as follows: Put the telephone plug into the detector jack and place the tele- DnOnA TeCatVnTa nn turn on the deteetor filament rheo- stat until you hear very slight "hissing" sound In the telephones, Now turn on the tickler knob to the maximum position. The next step is for you to adjust the tuning knob very carefully and very slowly until you hear the muaic. Then adjust it with extreme care, as a fraction of 6 degree makes change in the strength of the signals. Having sat- isfied yourself that you are receiv- ing the music with its greatest in- tensity. you will now adjust the Yer nier knob, also slowly and with great care until you eliminate any hiss Ing" or extraneous noises and get the music absolutely clear The set is now properly tuned, and a.. that Is necessary Is to take the telephone plug out of the detector jack and place t in the second stage of ampli- fication. You must now turn on the amplifier rhcostat until the signals are at their very loudest without any "hissing" or "whistling." Having done this, you can always leave the set at that adjustment, and you will only find it necessary to occasionally make slight adjustment with the rheostats as the batteries become ex- hausted.
 Using u Double Slide Tuner Question: should like to kno / how to use double slide tuning coil and how to find 360 meters on 1t. am using Galena detector. a grid | condenser. and pair of 1000 ohm phones with this tuning coil. live in an apartment house, and can erect no