US2238752A - Radio receiver with band spreading - Google Patents

Radio receiver with band spreading Download PDF

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Publication number
US2238752A
US2238752A US299508A US29950839A US2238752A US 2238752 A US2238752 A US 2238752A US 299508 A US299508 A US 299508A US 29950839 A US29950839 A US 29950839A US 2238752 A US2238752 A US 2238752A
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US
United States
Prior art keywords
tuning
band
dial
frequency
bands
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US299508A
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English (en)
Inventor
Rinia Herre
Ziegler Marc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
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Publication of US2238752A publication Critical patent/US2238752A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/10—Rope drive; Chain drive
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading

Definitions

  • This invention relates to a radio receiver with band spreading for a number of comparatively narrow frequency bands.
  • the frequencies on which the short Wave broadcast transmitters operate are grouped in a number of comparatively narrow frequency bands. There are no important broadcast transmitters in the frequency regions situated between these narrow frequency bands so that these frequency regions are of little importance for a broadcast receiver. There are consequently on the tuning dial large ranges in which there are no broadcasting stations of importance, whilst on the other hand the transmitters are so accumulated within the ranges of the tuning dial that correspond to the comparatively narrow fre-' quency bands that firstly exact adjustment of the receiver is difficult and secondly, due to the fact that the transmitters are situated on the tuning dial in close proximity to each other, the desired transmitter can be found back only with difficulty and mistaking may also readily occur.
  • the frequency range that can be covered by the complete variation of the tuning members is not constant but, as will be set out more fully, is dependent on the nature and the circuit arrangement of the tuning members and on the value of the mean frequency of the adjusted frequency region with the result that one of the comparatively narrow frequency bands can alone fill the entire tuning dial, whereas the other frequency bands occupy a part only of the tuning dial so that the remaining part of the available space remains unused.
  • the invention has for its object to provide an improved system for band-spread tuning with the avoidance of the drawbacks advanced hereinbefore of known systems.
  • the object of the invention is attained by arranging the dial divisions of two or more of the comparatively narrow frequency bands adjacent each other and causing them to be traversed in succession by the same pointer.
  • the movement of the pointer relatively to the tuning dial ensues continuously and synchronously with the movement of one or more tuning members which serve for tuning in the narrow frequency bands, said tuning members being so proportioned that the whole range of variations is necessary for successive tuning in two or more bands and means being provided switching over the circuits in which these tuning members are included for passing over from one frequency band to the other.
  • the whole or substantially the whole variation of one or more of the tuning members which are already persent in the receiver for tuning within a comparatively wide frequency band may be used for successive tuning in two or more comparatively narrow frequency bands.
  • the means for switching over the circuits for the passage from one narrow frequency band to another may preferably be operated automatically upon movement of the tuning members which serve for tuning in the narrow frequency bands.
  • Fig. 1 shows a receiver circuit with band spreading in which adjustment to a given frequency band is effected by including another fixed condenser in the oscillatory circuits to be tuned for each frequency band, tuning within the frequency band concerned being effected with th aid of variable condensers.
  • Fig. 2 shows a receiver circuit with band spreading in which band spread tuning is efliected with the aid of variable inductances. Similar parts of the circuit arrangements of Fig. l and Fig. 2 are designated by like reference numerals.
  • Fig. 3 shows a tuning dial according to the invention suitable for band spread reception.
  • Fig. 4 shows a dial indicating device.
  • Fig. 5 shows a circuit arrangement in conjunction with a tuning dial in which use is made for band spread reception in each oscillatory circuit to be tuned of a tuning condenser which is already present in the receiver and which serves for tuning in comparatively wide frequency-bands, for instance 500 to 1590 kcs./sec.
  • Figs. 6 and 7 show two mechanical forms of construction according to the invention.
  • l designates a mixing valve to which a preselection circuit 2 and an oscillator circuit 3 are connected.
  • Each of these circuits comprises an inductance 4, a number of fixed condensers capable of being connected into circuit in succession by means of a switch 5 and a small variable condenser 6.
  • the switch 5 permits of the receiver being adjusted in succession to different frequency bands, whereas the condensers ii serve for tuning the receiver in these frequency bands.
  • a number of fixed condensers which are connected into circuit in succession by means of a switch use may also be made of a sliding-electrode condenser capable of being adjusted to each frequency band by press-buttons.
  • a bandpass wave filter I tuned to the intermediate frequency
  • the anode circuit of the mixing valve I is connected to the intermediate-frequency amplifier, detector and low-frequency amplifier of the receiver which are schematically represented by 8.
  • Fig. 2 Where tuning is effected to the center of the frequency bands, in a manner similar to that of the circuit arrangement of Fig. 1, whereas tuning within the frequency bands is effected by the variation of variable inductances 9 included in the circuits 2 and 3, a calculation similar to the previous one shows that the frequency range which is traversed during the complete variation of the inductances 9 is approximately proportional to the mean frequency to which the oscillatory circuits are tuned by means of the fixed condensers and the switch 5.
  • traversing a frequency band having a high mean frequency involves a smaller variation of the inductances 9 than traversing a frequency band having a low mean frequency, although in this band spread arrangement the differences are not so great as in the previous one.
  • Fig. 3 which shows a band spread tuning dial according to the invention, serves to illustrate this principle.
  • ii, 82, i3 and Hi designate respectively parts of a tuning dial which serve for aces
  • tuning in the 14 meter, 17 meter, 20 meter, 25 meter and 31 meter bands in view of which the meter, 17 meter and 20 meter ba ids are continuous, as are the 25 meter and the 31 meter bands.
  • Tuning to the stations indicated by the portions 26 may be effected with the aid of a pointer 55.
  • Intermediate the two extreme positions of the pointer is the whole range of the tuning dial and also the whole variation of the tuning means that serve for band spread tuning. New, part of this whole variation is used for tuning in the 25 meter band l3 and the remaining part for tuning in the 31 meter band i i.
  • the whole variation is also used for tuning in the 14 meter, the 17 meter and the meter bands jointly. Vihen the pointer passes from the dial part it?
  • the tuning means of the meter band have to bc changed-over or adjusted from the meter band to the 31 meter band.
  • frequencies are received which are located outside the 25 meter band.
  • Changing-over or adjustment to a further frequency band may be effected, for example, by means of a switch which can be operated by hand or upon movement of the tuning condensers.
  • a switch which can be operated by hand or upon movement of the tuning condensers.
  • the limits of the bands do not occur at the same position of the tuning condensers so that automatic bandchange becomes very involved. If the bandchange is effected by hand an indicating device must be provided to indicate to which frequency band the receiver is adjusted.
  • This indicating device may be constituted, for example, by a hum" ber of small dial-illuminating lamps. each of which is capable of illuminating a part of the tuning dial which is associated with a given frequency band, said lamps being connected into circuit alternately and synchronously with the band-changing device, such as the switch 5 of Figs. 1 and 2 or the push-buttons, already mentioned in the description thereof, for adjustment to the desired frequency band.
  • the band-changing device such as the switch 5 of Figs. 1 and 2 or the push-buttons, already mentioned in the description thereof, for adjustment to the desired frequency band.
  • Fig. 4 shows such an indicating device in conjunction with the oscillatory circuit 2 of Fig. l.
  • a switch 5 permits of the oscillatory circuit 2 being tuned to three different frequency bands. These frequency bands correspond to the dial parts l6, l1 and is of the tuning dial. Tuning within these frequency bands is effected by means of a variable condenser 6 which is mechanically coupled to the pointer in of the tuning dial. Upon a complete variation of the condenser 5 the pointer traverses the Whole tuning dial.
  • the dial parts It, i? and is are illuminated respectively by small dial-illuminating lamps i9, 25 and 2! which are connected to a winding of the mains transformer 23 through a switch 22.
  • the switch 22 is mechanically coupled to the frequency band switch 5.
  • Fig. 5 shows a circuit arrangement of an oscillatory circuit suitable for band spreading in conjunction with a band spread tuning dial, the dial parts that serve for tuning within the frequency bands being all in a line.
  • the whole or substantially the whole variation of one or more of the tuning members which are already present in the receiver for tuning within a comparatively wide frequency-band is used for tuning in succession in two or more comparatively narrow frequency-bands, the means for switching the circuits when passing from one narrow frequency-band to another being automatically operated upon movement of the tuning members that serve for tuning in the narrow frequency bands.
  • the oscillatory circuit shown in Fig. includes an inductance H4, a variable tuning condenser H5 which is also used in tuning in a compara tively wide frequency-band, some fixed condensers H6, H1, H8, which can alternately be connected in series with the condenser I I5 by means of a switch I I9 and some variable condensers I20, I2I, I22, I23, I24 which, by means of a switch I25, can alternately be connected in parallel with the series combination of the condenser H5 and one of the fixed condensers.
  • the two switches H9 and I are mechanically coupled to one another and to an auxiliary switch I26.
  • the switches possess five positions which correspond to the five comparatively narrow frequency-bands and the five dial parts into which the tuning dial is divided. In each of these positions one of the condensers H6, H1, H8 and one of the condensers I20, I2I, I22, I23, I24 is connected into circuit.
  • the last mentioned variable condensers permit of the oscillatory circuit being tuned to the mean frequency of each of the frequency-bands.
  • the condensers H5, II I, H8 alternately govern the capacity-variation of the condenser H5 connected in series with one of these condensers. It is found that there is no need to connect another series condenser into circuit for each frequency band.
  • the tuning dial is provided with a number of conductive strips I30, I3I, I32, I33, I34 which correspond in length to the successive dial parts I0, II, I2, I3, I4 and which are connected respectively to the contacts of the auxiliary switch. I25.
  • Each of the frequency-bands corresponds to a different position of the switches H9, I25 and I 26, to one of the strips I to I34 and one of the dial parts I0 to I4.
  • the pointer I5 is alternately in contact with one of the strips I30 to I34 and in the position, shown in the drawings, of the switches and of the pointer it closes a circuit in which a relay I is included.
  • This relay receives current from a source of cur-- rent (not shown) which is connected between the tenninals I36 and I3! and in this state it interrupts the energizing circuit for the device I21.
  • a source of cur-- rent not shown
  • the relay I35 becomes inoperative so that the device I 21 starts to drive the switches.
  • the relay I35 is energized so that the device I2! is cut out of circuit.
  • a switch I38 operated by the wavelength switch ensures that the above-described device can operate in the case of band-spreading reception only.
  • Fig. 6 shows an embodiment of the invention in which for the purpose of obtaining bandspreading use is solely made of a mechanical construction.
  • This mechanical construction constitutes a connection between the tuning means, the operating knobs and the pointer drive of the tuning dial and comprises a lever 30 whose two ends can be shifted.
  • the tuning means are represented by a slidingelectrode condenser 3
  • the lever 30 and the sliding-electrode condenser 3I may also be gauged or interconnected by a connecting rod.
  • the drive for the pointer comprises two drums 34 and 35 mounted on one shaft in view of which the smallest 34 has running over it a cord which on the one hand is coupled to the lever 30 at the point 36 and on the other hand is kept stressed by a spring 31.
  • the pointer 38 is moved by a cord 39 running over the drum 35.
  • the lever 30 has two ends 40 and 4
  • the end 40 is fixed to a rod 42 which is provided with a plate 43 acted upon by a number of push-buttons.
  • One of these push-buttons is designated 44 in Fig. 6.
  • the lever pivots at the end 4! which, prior to operating the push-buttons, is moved into a predetermined position.
  • both the slidingelectrode condenser 3I- and the tuning pointer 38 are driven.
  • the receiver can be tuned in this manner to a number of pre-selected stations situated, for example, in the medium wave band.
  • is coupled to a nut 52 which, by means of a screw 54 driven by a tuning knob 45, can be pushed forward and backward.
  • the band 55 concerned is selected by moving the end 40 of the lever 30 into one of the positions 40, 50 or 60 by means of one of the push-buttons. Subsequently, tuning in the band concerned can be effected by rotatin the tuning knob 53. If, for example, the end of the lever 30 has been moved into the position 40 by means of the push-button 44, the lever 30 can occupy all positions between the position 30 and the position 45, the end 40 remaining in place and the end 4
  • the point 33 on the lever 30 to which the drive of the sliding-electrocle condenser 25! is connected is shifted to the point 43.
  • the tuning knob 53 is then turned back entirely'and the end 40 of the lever 30 is moved into the position 50 b means of another push button (not shown), the point 36 on the lever takes up the place of the point cs so that the end of the band-spreading dial ill corresponds with the beginning of the band-spreading dial 53.
  • a proper choice of the point 33 on the lever 3? therefore permits of causing the band-spreading dials 41 and do to be continuous.
  • the continuous band-spreading dial ltl is traversed in this position 59 of the end 45.
  • the sliding-electrode condenser 3i jumps, however, over to another value, as is apparent from the situation of the points 33, 4B and 5!.
  • Fig. 7 shows a further mechanical construc tion for obtaining band-spreading.
  • a sliding-electrode condenser 5i is connected to a shoe 63 by means of a rod $2.
  • Ihis shoe comprises a feeble incline 6 and a steep incline 65.
  • a rod 66 is arranged below the shoe so as to be adapted to slide. This rod 65 rests on two small rollers 67 and 68 and can be displaced by means of a tuning knob $9.
  • the rod i5 also carries a pointer it which, upon the rod 65 being displaced by means of the knob 69, passes over a number of substantially continuous tuning dials M, '55 and 75 corresponding with the said frequency bands.
  • the shoe 63 is forced by a spring (not shown), by means of one of its inclines, against one of the adjusting screws H3, H or 72, according to the position of the rod 55.
  • the rod 65 Upon rotation of the tuning knob 69 the rod 65 is displaced, so that the adjusting screw H, which is shown engaging the feeble incline M of the shoe E3, slides along this incline and thus enables the sliding-electrode condenser iii to move a short distance. If the rod 66 is displaced to the right, the adjusting screw 1! passes from the feeble incline M over to the steep incline 85 of the shoe 63 so that the sliding-electrode condenser 6! slides quickly until the feeble incline 64 engages the adjusting screw l2. Upon further displacement of the rod 55 the slidingelectrode condenser 6
  • the spacings between the tuning dials depend on the steepness of the incline 65; 7'! and 73 designate schematically the normal tuning dials and the associated pointer.
  • the bands in which band spreading is employed are desig nated by T9, and ill.
  • the pointer 13 moves slowly through these bands but rapidly through the intermediate parts of the tuning dial.
  • Each of the adjusting screws H3, 1! and I2 is adjustable, so that each of the tuning dials l4, l5 and it can be rated separately.
  • a radio receiver comprising at least one tunable circuit and means for tuning said circuit over a wide frequency range, said range including a plurality of comparatively narrow frequency bands, means constructed and arranged to eifect band spreading of said tunable circuit for said narrow frequency bands, a separate band spread scale for each of said narrow frequency bands, and a common indicator pointer under the control of said tuning means adapted to successively traverse said band spread scales.
  • a radio receiver comprising at least one tunable circuit and means for tuning said circuit over a wide frequency range, band spread means for converting said tunable circuit to respond respectively to a plurality of compara tively narrow frequency bands within said range. a plurality of aligned band spread scales, one for each of said narrow frequency bands, and a common indicator pointer under the control of said tuning means adapted to successively traverse said band spread scales.
  • the band spread means comprises a plurality of condensers and switch means for selectively connecting one of said condensers in series and another in shunt to said tuning means, there being as switch positions as there are band spread scales, means for operating the band spread switch means, and means under control of the indicator pointer for en ergizing said operating means whereby the tunable circuit is automatically conditioned for reception in the frequency band corresponding to the scale with which the indicator pointer is in cooperative relation.

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  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US299508A 1939-02-28 1939-10-14 Radio receiver with band spreading Expired - Lifetime US2238752A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL538389X 1939-02-28

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US2238752A true US2238752A (en) 1941-04-15

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Application Number Title Priority Date Filing Date
US299508A Expired - Lifetime US2238752A (en) 1939-02-28 1939-10-14 Radio receiver with band spreading

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US (1) US2238752A (en(2012))
BE (1) BE438137A (en(2012))
FR (1) FR863589A (en(2012))
GB (1) GB538389A (en(2012))
NL (1) NL55445C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443935A (en) * 1942-01-07 1948-06-22 Gen Electric Superheterodyne radio receiver
US2494502A (en) * 1944-06-26 1950-01-10 Ferris Instr Lab Electrical capacitance device
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning
DE957137C (de) * 1944-03-16 1957-01-31 Philips Nv Radioempfaenger mit Bandspreizung
US2922881A (en) * 1955-04-18 1960-01-26 Standard Coil Prod Co Inc Manual control having rotatable and tiltable stepped cam for television tuner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471523A (en) * 1941-11-04 1949-05-31 Hartford Nat Bank & Trust Co Circuit element for tuning an electric circuit over a plurality of frequency bands
US2796519A (en) * 1956-01-30 1957-06-18 Rca Corp Tuning device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443935A (en) * 1942-01-07 1948-06-22 Gen Electric Superheterodyne radio receiver
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning
DE957137C (de) * 1944-03-16 1957-01-31 Philips Nv Radioempfaenger mit Bandspreizung
US2494502A (en) * 1944-06-26 1950-01-10 Ferris Instr Lab Electrical capacitance device
US2922881A (en) * 1955-04-18 1960-01-26 Standard Coil Prod Co Inc Manual control having rotatable and tiltable stepped cam for television tuner

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GB538389A (en) 1941-07-31
NL55445C (en(2012))
FR863589A (fr) 1941-04-04
BE438137A (en(2012))

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