Патент USA US2412959код для вставки
4Dec. 24, 1946. H. c, BAUMANN 2,412,959 RADIO DIRECTIONFINDER SYSTEM Filed May l, 1943 HMH» SEA/SE ANTE AEl” ' ¿rra/mfr Patented Dec. 24,1946 2,412,959 UNITED STATES PAENT. OFFICE 2,412,959 RADIO DIRECTION FINDER SYSTEM Harold C. Baumann, Elizabeth, N. J., assignor to Federal rl‘elephorle & Radio Corporation, New York, N. Y., a corporation of Delaware Application May 1, 1943, Serial No. 485,273 6 Claims. (Cl. 250-11) This invention relates to radio direction finders and especially to direction ñnding systems which utilize both a directional antenna and a sense antenna. In systems of this type the impulses received on the sense antenna are combined with 2 antenna circuits, uniform high eiiiciency and accuracy'are obtained. This permits the design and adjustment of the antenna systems to re ceive a wide band of frequencies, and specifically impulses from the directional antenna to show , the use of band switching arrangements, without affecting the eiiiciency or operation of the phase the directional sense of the line of direction shifting network. Moreover, the losses which are which may be >derived from the latter impulses inevitable in the use of such a network are in~1 alone; that is, to show which end of said line points toward the transmitter. For this purpose 10 serted in the intermediate frequency portion of the 'circuits,.where they arenot as important, the sense antenna impulses must be `shifted in instead of in the radio frequency circuits, Where phase until they are in phase opposition with they may seriously affect eiiîciency. . one of the maxima of the directional antenna Other objects and advantages will appear from impulses and in phase with the other maximum. For this purpose the receiving channel con 15 the following description considered in, connec~ tion with the accompanying drawing which illus--nected to the sense antenna is coupled to the di trates one embodiment of the invention in dia~ rectional antenna receiving channel through a srammatic form. ~ phase shifting network, and the combined im pulses are passed through suitable amplifying In this embodiment the sense antenna I0 is and detecting circuits to operate a direction in 20 coupled through a radio frequency amplifier I I toan‘ intermediate frequency mixer or converter dicator. It has been found that when the various .I2-coupled to oscillator I3 in the usual manner. wavelengths of different transmitting stations to Directional antennaY Ie is coupled through radio which the antennae may be tuned vary substan frequency amplifier I5 to the intermediate fre tially in frequency, the operation and effect of the phase shifting network are affected, and 25 quency mixer or converter I6, which likewise is coupled to oscillator I3. The output fre compensation of some type is desirable. More quencies of mixer I2 and I6 will therefore be the over, the network introduces a loss in the radio same, each modulated by the amplified impulses frequency circuits that tends to reduce eiiiciency. received from the respective antennas. A purpose of the invention is to provide a re The output of mixer I6 is modulated by the ceiving and amplifying system for direction find 30 output of mixer I2 through a phase shift network ers of the indicated type in which the phase Il arranged to adjust the phase of impulses from shifting network is unaffected by changes in in« mixer I2 to synchronism with those from mixer coming signal frequency. Other objects are to I6 in a well known manner. The network dis eliminate losses due to said network in the radio closed includes capacitor I8 and variable re frequency circuits which may affect efficiency, sistor I9 in series in line 20 connecting the out and to provide a better signal to noise ratio. put circuits of said mixers. The output circuit These purposes are in general accomplished by of mixer I6 is coupled through transformer 2I employing a superheterodyne amplifier with sep to intermediate frequency amplifier 22 whose arate mixer or frequency converter tubes in each of the separate antenna circuits, and connecting 40 output is converted in known manner into a form suitable for operating a direction indicator, as by the phase shifting network between the mixer an audio frequency detector and amplifier sys tube output to modulate the directional antenna tem 23 coupled to direction finder 24 which may output impulses with impulses from the sense be a cathode ray tube. antenna in proper phase to produce a resultant While a preferred embodiment has been de impulse which will indicate the sense of the line 45 scribed, this has been done by way of illustration of direction on the indicator. The modulated and not limitation since other arrangements and output is passed through a suitable intermediate frequency ampliñer followed by any suitable type of detecting and amplifying system adapted to operate a, direction indicator such as a cathode 50 ray tube. This arrangement has several advantages. By operating the phase shift network only at the constructions may be employed without depart ing from the scope of the invention as set forth in the claims. What is claimed is: 1 1. A radio direction finder system including a receiving circuit arranged for coupling to a non directional antenna means, a receiving circuit arranged for coupling to a directional antenna ñxed intermediate frequency regardless of changes in the frequency of the signals in the 55 means, frequency converting means for convert 2,412,959 3 ing the signal Waves in each receiving circuit t0 the same intermediate frequency, output circuits for said frequency converting means, phase shift 4 means directly connected with the output of one of the frequency converting means, means for combining the intermediate frequency WavesI from the outputs of said frequency converting ing means in one of said output circuits, means means in a common circuit, a single intermediate for combining the intermediate frequency Waves Ul frequency amplifier coupled With the combining from said output circuits in a common circuit, means, and a single detector and indicator cir and a single detector and indicator circuit cuit coupled to said intermediate frequency coupled to said common circuit. amplifier. 2. A radio direction finder system including a 5. A radio direction finder system including a 10 receiving circuit arranged for coupling to a sense receiving circuit arranged for coupling to a sense antenna, a receiving circuit arranged for antenna, a receiving circuit arranged for cou coupling to a directional antenna, means for ccn pling to a directional antenna, means for con verting signal Waves in each circuit to a common verting signal waves in each circuit to a common intermediate frequency, means directly connected 15 intermediate frequency for shifting the phase of with the converting means and operative on said intermediate frequency, means operative on said the intermediate frequency waves from the sense antenna circuit into phase synchronisrn with the intermediate frequency for shifting the phase of the intermediate frequency Waves from the sense intermediate frequency waves from the direc antenna Acircuit into phase synchronism with the tional antenna circuit, means for combining thc intermediate frequency Waves from the direc Waves from both circuits in a common circuL, 20 tional antennav circuit, means f_or combining the and a single detector and indicator circuit waves from both circuits in a common circuit, a coupled to said common circuit. single intermediate frequency amplifier coupled 3. A radio direction finder system including a with the combining means, and a single. de; receiving circuit arranged for coupling to av sense tector and indicator circuit coupled to said inter antenna, a receiving circuit arranged for cou mediate frequency amplifier. ' pling to a directional antenna, means for sep 6. A radio direction finder system inciuding a arately converting signal Waves in each circuit receiving circuit arranged for coupling toa sense to the same intermediate frequency including a antenna, a receiving circuit arranged for cou mixer tube in each circuit, an intermediate fre~ pling to a directional antenna, means for sep 30 quency oscillation generator associated with both arately converting signal Waves in each circuit mixer tubes, a phase shifting network connected to the same intermediate frequency including a between the output circuits of the'mixer tubes, mixer tube in each circuit, an intermediate fre an intermediate frequency amplifier coupled to quency oscillation generator associated with both the output circuit of one of said tubes and a mixer tubes, a phase shifting network connected single detector and indicator circuit coupled to 35 between the output circuits of the mixer tubes the Vintermediate frequency amplifier circuit. and combining the Wavesv from both circuits, a 4. A radio direction finder system including a single intermediate frequency amplifier circuit receiving circuit arranged for coupling to a non coupled to the output circuit of one of said tubes, directional antenna means, a receiving circuit and a single detector and indicator circuit: cou arranged for coupling to a directional antenna 40 pled to the intermediate frequency amplifier means, frequency converting means for convert ing the signal Waves in each receiving circuit to HAROLD C.k BAUMANN. the same intermediate frequency, phase shifting circuit. ' ' '