Show J N edited by 0 dduglas editor of 7 i aa 1 v V fo 10 t n ss it turn F plate ya h ii aa A A P 1 I 1 vs L showing I low ilow a modified inductively coupled honeycomb receiver may be B constructed by the beginner the three honeycomb coll rege tive receiver r la Is considered among radio fans falls to bo be one of tile the best beat types of rats for the beginner who contemplates going from the crystal detector to a tube set A sl alight tIit modification of this circuit Is shown in the diagram diagutin li it will be seen that hint two varl variable ablo controls are eliminated by substituting g a axed primary coll coil coupled to the secondary and thereby doing may anway with the arl mary variable condenser in till this man ner the honeycomb set Is made to tune extremely sharp and easy to adjust the primary coll coil Is made by wrapping 10 turns turna of no 22 dac copper magnet wire in a circle and tying it to tile the secondary honeycomb coll coil of 35 0 or DO 50 turns tunis this outside coll coil should be wound la in the same flame direction us as the secondary to which it Is fattened the plate platea coll which Is another honeycomb of about 60 50 or 75 turns Is connected in series with the plate of the detector tube and tile the tel ephone receivers cIvers around tile the ere era and tile the B battery the usual phone condenser Is connected vila this condenser r Is important as it will assist in regeneration the secondary coll coil to which the primary Is fastened roust must be sli tinted by a good variable condenser the better the condenser the sharper the set will tune and tile the louder the san alons wilt will come in the movable or rotor plates of the aie variable condenser of the tl ie 21 or 23 plate type connect to the buttery battery side of the circuit ctr cult till alila 8 will help to eliminate body capacity effects the stationary plates connect with tile the grid condenser it if tho the condenser la Is of the metal end type the rotor plates will connect to the battery side of tile the and capacity capaci tj effects will bill be entirely eliminated tile the grid gild condenser la Is of the nilca mica I 1 type ranging from to tile the condenser should he be shunted with a grid leak of approximately 2 if the set squeals too macii try another value of grid leak in this circuit the tubs 12 lighted and turned up to the usual brightness the plate coll coil la Is placed cloye to the secondary coll coil while the variable condenser across the second ary afy Is slowly moved back bach and forth this will pick up the stations within the range of the receiving set more careful adjustment to la necessary to clear up tile the music or voice and this Is accomplished by moving the plate coll coil to tn or from the secondary it 11 it la Is found that the set tunes a little broad on local stations the primary coil should be rewound with less turns if six turn turns tire are placed on the primary it will tune a great deal sharper than bail with ten turns but abere will be a slight decrease in siglar strength tills this makes nn an ideal set and Is capable of picking up distant sta eions for the higher wave vave lengths around meters the secondary coll coil may be increased to an L 75 eff york herald erald fl |