US1833592A - Wireless receiving apparatus - Google Patents

Description

Nov. 24, 1931. J ROUTIN 1,833,592

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Patented Nov. 24, 1931 JOSEPH LOUIS ROUTIN, OF PARIS, FRANCE PATENT OFFICE I WIRELESS RECEIVING APPARATUS Application filed July 11, 1929, Serial No.

The invention relates to wireless receiving apparatus for the reception of a plurality of ranges of wave lengths.

It is well known that the adjustment of a receiving apparatus for wireless telephony I or telegraphy is effected by operating members which render itpossible to tune the oscilla'ting' circuit to the frequency ofthe waves emitted by any given transmitting station from which it is desired to obtain reception.-

=One object of theinvention is to provide v means rendering it possible to adjust the positions which it is necessary to give to the adjusting members by the aid, of indicating means showing the wave length or the frequency either directly or simply giving the name of the'transmitting station.

' Another object of the invention is to render it possible to adjust simultaneously the two oscillating circuits which are provided in 7 most receiving apparatus by means of a simple observation on a common adjustment scale.

Apart from this the arrangement of the adjustment is such that it can be easily adapted I desired'to obtain reception.

.The invention further renders it possible to explore methodically'all the stations which are transmitting at the time when the listener is using the apparatus, and in fact renders it possible by operating the regulating devices 1, in a continuous manner and in the same direction to pass successively through the various adjustments corresponding to all the'wave lengths. r I

For the sake of simplicity it will be assumed in the followingdescription that the variable member in the oscillating circuits 377,519, and in Germany August 8, 1928.

which are to be tuned consists of a capacity. but the arrangements described are equally applicable to the case in which the variable member is an inductance.

Preferred constructional forms according to the invention are illustrated by way of example on the accompanying drawings.

Referring to the drawings, Figs. 1 and 2' show diagrammatically in elevation and in plan (partly in section) how the invention maybe applied to a receiving apparatus'comprising two variable condensers capable of being employed successively in co-operation with two different inductances correspond ing respectively to the ranges of wave lengths which are generally known as short waves and long waves respectively. i

' Fig. 3 shows the developmentv of a graph for use in the apparatus shown in Figs. 1 and 2.

Fig. 4 shows diagrammatically in a medial vertical section the construction of a regulating unit for a superheterodyne receiver by assembling on a common frame the members already shown in Figs. 1 and 2 will the addition on the one hand of a special device for illuminating the adjustment scales and the indexes and on the other hand the addition of the oscillating coils as also the sockets intended for the reception of a'heterodyne valve. i

In all the figures the reference numeral 1 denotes a movable vane or shutter which can be rotated around an'axis 2 which is determined by the ends of two triangular bearing members 3 and 4. The reference numeral-5 denotes a conical cup or seating which is rigidly fiXed to a spindle 6 and which is em ployed for effecting the rotating of the vane' 1 by the aid of the friction between the bearing member 4 and the said cup 5. The ref erence numerals 7 and 8 denote the switching devices or commutators of known type which are employed for varying the values of V the inductances in the oscillating circuits 9'5" (namely the inductance of the ordinary aerial or of the frame aerial and the inductance of the tuning or oscillating circuits), said switching members being mounted on the spindle 6. The reference numeral 9 denotes to the wave lengths in the range of the. long waves. The reference numerals 14 and 14 denote two cylindrical drums whichare capable of rotation about axles 15 and 15' and which are rigidly attached respectively to the movable members of'the two variable condensers employed for the regulation of the two oscillating circuits. The reference letters a, a, A, A denote two sets of calibration curves serving as indexes and corresponding respectively to theshort waves and to thej'lon'g waves, the said curves being drawn, .aswill be hereinafter explained, on sheets which are passed around the cal drums 14 and 14.

The front sideof the vane 1 is provided along the vertical line 2 with a central strip having a scale marked on it showing the numberswhich indicate the. wave length for the short waves. The said front side has, in

addition to thisthe names of the principal transmitting stations for short waves marked. out on it', each name being marked at the height of the corresponding wave length. The said front side is'likewise provided on.

its right hand side (whichmasks the scale 13) with a duplicate 12 of the fixed scale 12. The rear side of the vane 1 islikewise provided in exactly similar manner with all the corresponding indications relating to the long waves.

The adjustment scale which is always constitutedby the vane 1 and one or the other of the. fixed scales. (scale 12 for the short waves and scale 13 for the long waves) must be of sufliciently small total width to enable its two vertical edges which are employed as reference lines for the adjustment, to be ob-- served by the eye simultaneously.

In orderzto render it possible to co-ordi natereadily each of the scales for the short waves and the long waves with the correspondingindexes, it is preferable to employ two difl'erentcolours, namely, one for the indications relatingto the short waves and; another for those. relating to the long waves.

The calibration curves a, a-,:A, A are ob-- tained in the following -m-anner:

'After'having adjusted the condensers for the reception of waves having a definite length. the operator markso-n the sheets running round the drums 14- and 14, with re gard to the two reference linesconstituted by the outer vertical edges of the. scales 12 and .12, the -two points which are located at cylindrithe height of the horizontal graduation which indicates the length of the waves for which the adjustment has been effected. The same operation is then repeated for a number of other wave lengths and the points thus obtained are joined up to form a continuous curve. p

It will be seen fromFig. 3, which shows the development of the curves obtained in the aforesaid manner on the surface of the drum 14:, that the said'curves constitute nothing more or less than curves showing in ordinary co-ordinates the lengths of the waves (taken on the axis 03 corresponding to the tunings of the corresponding oscillating circuit as a function of the positions of the movable part of the condenser (taken along the axis 0 a;). p

When the vane l occupies the position shown in Fig. 1 only the scales corresponding to the short waves are visible; but if the vane isturned through an angle of 180 in a clockwise direction as viewedfrom above, the scales corresponding to the long waves will be rendered. visible.

It will be seen that in the position shown in Fig. 1 the apparatus has been adjusted for the reception of waves of 275 meters,

lengthr'inasmuch asv the two calibration curves a, a which are the'curves correspond ing to the position of the vane shown 1n the figure, intersect thelines of the adjust ment scale at the particular height; which corresponds to the said wave length.-

In order to render it possible to distinguish readily the calibration curves a, a cor responding tothe short waves from the calibration curves A, A corresponding to the long waves, the two curves have been plotted in opposite'directions so that in the case of the short waves thereadings increase from the top towards the bottom, whilst in the case of the long waves they increase from the bottom towards the top.

When one and the same transmitting station can be received with one of the condensers in' two different positions (as is the case for instance in the. arrangement of the circuit for what is known as super-heterodyne reception), the drum corresponding to the condenser in questionis provided with two calibration, curves corresponding respective-- ly to'the two adjustments. for the purpose of facilitating the elimination of waves ca- .p able of interfering with those of the transmitting: station from which it is desired to obtain reception, by choosing whichever of the two adjustments gives the best results.

In order to render it possible in case of need to correct the calibration curves serving as indexes (for example in the eventof an alteration of the constants of the oscillating circuits in consequence ofthe employment of a new valve) the said calibration,

curves-can be drawn in pencil on suitable material so'as to renderit possible to erase them easily.

. It will be seen that the indications marked on the movable vane 1 are entirely independent of the constitution of the oscillating circuits of the individual apparatus, and that as a consequence of this, it is possible to employ printing or photographic processes for the production of the said indicationsin large quantities. This constitutes an advantage of very great importance, as it renders it possible to prepare periodically with little expense revisedrcopies, taking into account the modifications which are frequently made in the distribution of the wave lengths amongst the diiierent transmitting stations.

In order to remove a vane bearing obsolete indications from the apparatus, it is only necessary to raise it so as to disengage it from the lower seating 4, and in order to put a new vane provided with up to date indications in place, it is only necessary to pass its upperbearing member 3 into the seating 9 and then to raise it, thereby slightly fiexing the spring 11 in such manner as to permit of theintroduction of the bearing member 4 into the seating 5.

In order that the vane should automatically take up thecorrect position in which it rests against the scale 12 or the scale 13 as the case may be, it is only necessary to arrange the apparatus in such manner that the seating 5 passes through a little more than half a revolution when the control member for the commutators is moved from the position corre-,

'sponding to the short waves to the position corresponding to the long wavesor vice versa.

It will be seen that it only takes a few seconds to replace a vane having obsolete indications by a vane having up to date indications and that the replacing does not necessitate the employment of any tools. It will be obvious that this constitutes a very great advantage.

Furthermore, it will be seen that, according to the invention, owing to the connections between the members 1, 7 and 8 which are controlled by a single cont-rolling mem ber, it is ensured withcertainty that the apparatus is always ready for receiving any one of the transmitting stations the names of which are given on the vane, the only operation which it is necessary tocarry out consisting in the adjustment of the calibration curve serving as an'index to the level of the station from which reception is desired.

It will likewise be seen that, as has already been indicated, the adjustments of the two circuits are eflected by the employment of a common adjustment scale arranged in such manner that the two adjustments can be made simultaneously by a single observation embracing both the adjustment lines constituted by the outer edges of the scales 12 and 12 or 13 and 13' respectively.

Finally it will be seen that by actuating simultaneously the two adjustment knobs in such manner that the two calibration curves serving as indexes always coincide with the adjustment lines of the scales 12 and 12' or 13 and 13 respectively on the same horizontal line, it is possible to explore methodically all the transmitting stations (whether marked on the vane or not) which are transmitting at the moment when the operator is listening in, inasmuch as the apparatus will pass in succession through the positions of adjustment corresponding to all the wave lengths.

In a modified constructional form according to the invention, the graduations of the common scale may, for example, be provided on a flexible band which can be displaced in a vertical direction for the purpose of changing the range of wave lengths. When this modified constructional form is adopted it will obviously be possible to employ any desired number of ranges of wave lengths.

It is also possible to arrange the calibra tion curves serving as indexes on flexible bands which can be moved in opposite directions perpendicularly to the common adjustment scale.

Furthermore, by arranging all the scale indications on translucent bands, it is possible to superpose the two adjustment lines 12 and 12. The arrangement of the three films thus obtained could be illuminated from the rear and the observation of the calibration curves could be eiiected by means of a magnifying eyepiece.

It isalso possible to employ other modified constructional forms having only one adjustment line by employing any of the devices known in optics for obtaining the superposition of two images.

The calibration curves may also be provided on discs the axes of which are per pendicular tothe plane of the figure.

The mechanical connection between the moving parts of the condensers and the drums 14 and 141 may be eifected by any desired known means (for example, by means of toothed gears or funicular transmission gears).

Particularly useful constructional forms according to the invention can be obtained by arranging the condensers in the interior of the drums l4 and 14. For example, the fixed plates of the condensers may be mounted on the axles 15 and 15' and the movable plates of the condenser may be mounted on the ends of the drums 14 and 14.

In the constructional form illustrated in Fig. 4 the condensers are mounted in the interior of the drums 14 and 14; as will be hereinafter explained. The reference numeral '16 denotes a fixed plate provided with a window the breadth of which corresponds approximately to the distance between the two axles 15 and 15' and the height of which is at least equal to that of the drums. The reference numerals 17 and 18 denote two brackets which are rigidly attached to the plate 16 and which serve as supports for the spindle 6, 10, 15, as also for the graduated bands 12 and 13. The reference numeral-19 denotes a'control knob which renders it possible'by the aid of a worm 20 and a worm wheel 21 to rotate the drum 14 around the fixed spindle 15.. The reference numeral 22 denotes a control knob which renders it possible through the agency of pinions 23 and 24C to rotate the spindle 6. The reference numeral 25 denotes one of the oscillating coils which-is fixed on the bracket 18. The reference numeral 26 indicatesthe sockets for the heterodyne lamp. The reference numeral 27 denotes a plate of translucent and reflecting material (nonsilvered' glass or transparent celluloid, for example) which serves both for ensuring protection-against dust and for reflecting towardsthe vane 1 and towards the indexesthe light emitted froma small tubular lamp 28 arranged behind the plate 16.

It will be seen from Fig. l that the vane and-the indeXes'are illuminated both directly by the light emitted from the lamp 28 and indirectly by the reflected beam coming from the image 28 of the'source'of light 28.

Inorder torender possible free' access to the vane, the plate 27 isarranged in such manner as to be capable of sliding in grooves 29' provided in the plate 16.

ill should be :noted that the arrangementshown in Fig. 4 constitutes a single operable unit mounted on a'common frame and unit-- ing in itself all the membersrequisite for the transforming and regulating operations in a receiving apparatus. The said arrangement constitutes a unit which can be adapted to any existing apparatus which may be of the most varied constructional forms both in respect to the collecting devices (frame'aerials or ordinary aerials) and in respect to the T amplifying and detecting devices employed before the receotion on the telephone. l g Y 1 i lt-will be understood that tins arran ement can be adapted to any existing receiving apparatus without necessitating any work other than that of connecting it up.

Iclai'mr l 1. In a wireless receivingappal 'atus for the reception of a plurality of ranges of wave lengths the combination of: switching devices for adjusting the inductance and capacity of the circuit to the various ranges of wave lengths; adjustment scales corresponding respectively to the ranges of wave lengths and adapted to be rendered visible successively by ii the operation of'said switching devices, said scales being provided with features distin guishing them from one another; regulating devices forvarying the inductance and capacity of the circuit for tuning purposes; a

movable graphdiagram provided with: calibration curves corresponding to the different ranges of wave lengths which serve as an index for said adjustment scales and are moved transversely to said scales by said regulating devices, said adjustment'scaleshaving any desired graduation and said graph diagram being plotted by trial without it being necessary to take into account the constitution and adjustment of the circuit and said calibration curves being provided with distinguishing features corresponding with those of said scales. 7 I

2. In a wireless receiving apparatus of the type set forth, a combination as specified in claim 1,'in further combination with a rectangular vane which is adapted to turn about an axis in such manner as to'cover and un cover parts of said adjustmentscales so as to render them visible successively, said vane beingmarked with indications-of the wave lengths andindications of the names of the transmitting stations, each such last-named indication being arranged at the height on the scale of'the correspondingwave length indication. I.

3. In a wireless receiving apparatus of the type set forth, a combination as specified claim 1, wherein each of said regulating devices is adapted to be used successively for two ranges of wave lengths indicated on two of said scales adapted to be made visible successively, and wherein the graduations of these two scales run in opposite-directions to one another sothat the two curves serving as indexes are easily distinguishable from one another,

. 4. Ina wireless receiving apparatus of the wherein for each range of wave length an ad- 7 j ustment scale is employed which is common to two graph diagrams and which is of such small breadth that it is possible to effect two regulations simultaneously by a single observation taken at the two longitudinal edges of the said scale.

r 5. In a. wireless receiving apparatus of the type set forth, a'combination as specified in claim 1 for the simultaneous regulation of two oscillating circuits each comprising a single range of wave lengths, wherein said graph diagrams provided with calibration curves are arranged on two vertical drums placed side by side and wherein a common movable adjustment scale is arranged between the said two drums.

6. In a wireless receiving apparatus of the scales fixed parallel to said drums in the immediate vicinity thereof, a movable pivoted vane on the two sides of which the indications showing the wave lengths and the names of the principal transmitting stations for each range of wave lengths are marked, means on said vane for always masking one of the said graduated scales by overlapping it and resting on it, two triangular bearing members attached to said vane and serving as centres'about which it rotates, a conical cup in which one of said bearing members rests and which is continuously impelled towards said vane by spring action, and a second cup inv which the other one of said bearing members rests and which serves to drive said vane by friction.

7. In a wireless receiving apparatus of the type set forth, a combination as specified in claim 1 for two oscillating circuits each having two ranges of wave lengths, wherein two graph diagrams bearing the said calibration curves are arranged on two vertical drums placed side by side and wherein the adjustment scales comprise two narrow graduated scales fixed paralled to said drums in the immediate vicinity thereof, a movable pivoted vane on the two sides of which the indica-.

tions showing the wave lengths and the names of the principal transmitting stations for each range of wave lengths are marked, means on said vane for always masking one of the said graduated scales by overlapping it and resting on it, two triangular bearing members attached to said vane and serving as centres about which it rotates, a conical cup in which one of said bearing members rests and which is continuously impelled towards said vane by spring action, and a second cup in which the other one of said bearing members rests and which serves to drive said vane by friction, in further combination with a lamp for illuminating said indexes and said adjustment scales, a movable window arranged so as to protect the apparatus from dust and to reflect the light emitted by said lamp, manipulating knobs for said regulating devices and said scales, amplifying devices, and sockets for the valves utilized in conjunction with the circuits the constitution of which is to a be varied, the whole of the aforesaid members being assembled so as to form one unit suitable for adaptation to all kinds of existing receiving apparatus no matter what may be the arrangement of the latter with regard to the aerials and the amplifying and detecting devices employed prior to reception on the telephone.

adapted to be rendered visible successively by the operation of said switching devices, said scales being provided with features distinguishing them' from one another; regulating devices for varying the inductance and capacity of the circuit for tuning purposes; a movable graph diagram provided wit-h cali bration curves corresponding to the different ranges of wave lengths which serve as an index for said adjustment scales and are moved transversely to said scales by said regulating devices, said adjustment scales having any desired graduation without it being necessary to take into account the constitution and adjustment of the circuit and said calibration curves being provided with distinguishing features corresponding with those of said scales; and a single controlling member for controlling said switching devices and rendering said scales visible successively, said last-named devices and mechanisms being rigidly united with one another.

JOSEPH LOUIS ROUTIN.

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