Show aji i 0 r yet to be solved winter blanketing fading static dead spots not understood JJ there Is still plenty of in radio do we know about the winter blanketing that interfered with reception last ear or about fading and static atio use of radio fur controlling mobile bodies and the of light hent and power muy le possible but excepting the controlling of mobile bodies few ex even have been circled on in these special problems short wave transmission tue latest echols ral and means af r ngod L t ly aff ra g atee that happens in afler a auchst guives tho until it Is received at and in this field alone considerably research must be cairned auty a time ago several indulged in a vigorous debater afi what ether was and as a word usually used to media through which radio waves jare f lisett tt audio amplification intensely developed the modern audio tem Is one branch of the radioed which has been under intense bleyer there are three major audij systems in use today transformer resistance and impe amplifiers alch Is alie basti matter ut conjecture and engla will never agree in this matter however audio reproduction 1 of taste and alie ape of that one likes best ls purely bi ear it Is a good to gieir the various 1 building one at one time it was generally gine rally i d blut the resistance to other forms but former eng lnier acot bua andt fault Is that a large prefer the modem trans the new transformers do not leave the limitations of the old of the new transformers over alie entire scale without favorin fu vorin iiii particular band the capacity lias been apt at a minimum and ahr iron which Is asid tod y does not saturate as did previous mn lerdal if one has an old audio amplifier it would an him to equip or have the set equipped with modern transform ers or other audio systems lie will ind a remarkable ence in ro production improved desin of audio hus also forward voltage amplifiers which are om tilled power amplifiers auci tin furthers alie improvement in audio quality for preventing over of the power tube the power usually consists of one stage rf audio frequency a power tube a tube and a step up cr for li alie of the aliouse current ana a niter hissem to oat the plate st I 1 auls io it greater volume tone wonderfully improved circuits leave been to nih he use of detector de and powerful tules out in tie last veur lip ft elvers greater volume and a de liml tone improvement 1 most nit lent power so far buch ns alp IJ and r 71 an RO C thin llido kreinest Krei test is at w lien applying around volts n alit plate and 40 volts of C antt rv 1 his hns brought about lie s salv for ample current supply lian isan over am volts of II 11 batten the and nance costs to amounts the new inver tube alone a current of 20 when combined with ilie drain from lie other tubes lowers lie volt nie of a battery block to the point where distortion in so II 11 art rov ln in foreit strides have hcan ande in alie one sup alv af eledra current hie house supply for taking hie place of bilt erlis fur the plate supply tah la mccomi by stippling up lie regular alternating and pass ing it tl dougli a suitable rectifier and filter to produce smooth d c without pulsations or there anre alao a number of V power units and bid clr to in aas hen the line voltage cops up or lovan ns Is the ahre isolated hovver plants supply the current tha variation upsets lie lal ance unless the and volt are supplied from alie saime source when variations in H volt age anre offset by variations in C voltage and the resulting plute cur alft a wf af ff WM aft y vav alon cance alie agree on what aas among a few of the other of still withstand forts of science are the auford and sun gp radio and the cause of the sc dead spots where reception ol 01 anny ape of radio waves impossible radio for many the adaptation of radio ha bw applied to irany practical uses besids it Is us i operate relays which throw switch in houses at considerable from the main plant it 13 1 r in several w us to aid navigator so Y the sen and air and Is now adapted to railroads as a means 0 control and as a safety device n i U ilso found of great benefit in i time signals araci 3 the world which ene scientists and explorers to accurately points on the surface 0 the eartle its use in peace Is general and its use in war includes many an besides for communication which the military and naval author i ties will not reveal or discuss although man practical uses hav been found for radio there are man possibilities which only the tar scientists can predict and only i skilled and experienced engineers ci carry out J avalue w bv A r 85 detec torvol abla 5 to 90 volt the B supply from 20 to W iholts and each C supply from bonef so 45 thereby per the exact voltages vol to be use alie tubes in the receive their greatest A ground deep enough to 1 l strike B ande ath styf pi ic huun ajl leipe n beba OT that the ere in tracts ht to tit sanda soil and gli BT which alie rain passed down to a lor ground v anter level As a ground con 18 el lection Is generally made hv tt driving an iron pipe into the grorud B mutt n moist pi ice in orar to r be alie pipes and to be H deeper alian usual in these W sand prices il ome ears ago atie vc of alie department of alie interior tl mada n cm ful study of alie ground la kul and around chicago and mapped the m of a lake which was in existence at the close of alie great ice age rr atul reference to tills map an ele talc corn etc of took advantage of the work of alie survey and drove their B grounds to the irod depth lat ia or the reason grounds tary alti r in enic lenci in different sect loni here pipes mii t he driven for a aroun chev anit go dica enough ti e moist oil u 1 3 w HINTS FOR RADIO FANS le MM M M H alie plate olane for detector iana arles with each tube a penetrate ar nun rial but are absorbed by bactal ft two or throe weeks Is about as ions 1 as the average buttery lasts on one acci clerge ac A listener who e twist he dials of his or her set be to a movie an who d petered and left or twenty dir ferent motion pit lire healers in a S v lian erecting the antenna maite sure insulator are and carru i gated no water will run off before 1 t adds resistance w u mahke provision for lowering the a annn so the insulators and eien the wire iteld tun be a arte of dirt 1 A good wnm to clean a crystil has lost its Is to ia a it in ether rance the cry ani in a small bottle containing ether shake alie bottle vigorously after remove the castal with n pi of tweezers alie re turn to its strength 1 lie number of turns for ft coll of given diameter will a to lie constant ron stant lf type of insulation empl of alie fo if alie tuba has an unusually value more turns wll 11 and if lie alue Is high few turns will di f lien wiring a radio uses i variable condenser r i tuning the circuit lla astl i 1 l pi lies i hamd be the grid of HIP detector rulx tit course alie niton plates should 1 to the if alf 8 coll y use more tubes than ae u for alie results daire L K artl quenta happens that anesi i olento s will have more tules turn ing than arp necess uri and then alc 1 tune to lessen the volume of s un for local for i farst audio hauge Is |