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Volume 46, Issue 458
Displaying 1-8 of 8 articles from this issue
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S. CHIBA, S. KITTA1926 Volume 46 Issue 458 Pages 1003-1016
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe prescnt paper is a resume of the test results obtained by the authors for the various type of high frequency amplifiers. For the wave length longer than 3000 meters, the selective or the non selective character may be obtained at will with the suitable design of amplifiers. By the use of audio-transformer sheets which from the closed magnetic path for the auto-transformer, a very good character can be given for the non-selective auto-transformer amplifiers. The amplifiers designed gives practically constant amplification for wave length from 5000m to 25000m or from 3000m to 10, 000m. It is shown that audio-transformer sheets may be also employed for the non-selective type amplifiers.
For shorter wave length, the non-selective type amplifiers must be abandoned since they are not efficient enough. To increase the amplification per stage, one of the following method must be employed.
(a) The coil of low-loss type must be employed.
(b) Care must be taken to reduce the effect of the capacities included in parallel with the plate impedance.
(c) It is sometimes necessary to reduce the effective resistance in the plate tuned circuit of the initial stage amplifier by feeding back the amplified voltage into the input side of this initial stage. (reaction)
Typical examples obtained with reaction for the resistance and the transformer amplifiers are given. Some practical remarks are also given, which may be useful to get the Stable working and the maximum amplification for the predetermined value of the wave length.View full abstractDownload PDF (1001K) -
S. CHIBA1926 Volume 46 Issue 458 Pages 1017-1026
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSVarious problems on multi-stage amplifiers are treated in the present paper. In the first paragraph, the selective characteristics are explained. That the reactance or the transformer amplifiers whose magnetic circuits are closed ones made of iron sheets have a very good non-seleetive characteristic is because (a) the iron loss flattens the characteristic curve at the resonant frequency, (b) and for frequencies lower than the resonant frequency the effective permeability of the core and hence the plate impedance increase to a certain amount.
In the second paragraph, expressions of the amplification per stage are given for both the selective and the non-selective amplifiers. In the selective type mult-stage amplifiers, the amplification per stage should not be too high. Otherwise amplifiers will have the following disadvantages.
(a) It damages the quality of speech or music for the receptions of wireless telephony. (because of the frequency distortion)
(b) It is liable to start the self oscillation of the system.
(c) It is not suitable for the reception of high-speed telegraphs. By narrowing the amplifying band or increasing the selectivity, the time required forthe curront to built up is proportionally increased.
In the third paragraph problems on the reaction (regenerative) caupling and the amplitude dis ortions are treated. Devices which prevent automatic-ally such distortions in the amplifier system are explained.
In the fourth paragraph the transient phenomena in the amplifiers (when the frequency) is not too high is briefly considered. It is pointed out thatfor the selective type amplifiers this problem is sometimes very important and must be taken into account in the design of such ampliers.View full abstractDownload PDF (641K) -
KAZUKIYO OGAWA1926 Volume 46 Issue 458 Pages 1027-1033
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSKüpfmüller and Thomas of Siemens u. Halske A. G. proposed in 1922 a newbridge method of measuring the working leakance of telephone cables directly.The present author examined the earth capacity effects of that bridge, andfound which one of earth capacities cause the most serious errors for theworking leakance of the cnble.View full abstractDownload PDF (368K) -
Y. TORIYAMA, S. YOSHIDA1926 Volume 46 Issue 458 Pages 1034-1038
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt is known fact that the disruptive strength of gases is effected by the strong magnetic field. We can imagine that the strong magnetic field has also some effects on the dielectric strength of liquid dielectrics.
The authors tested the disruptive strength of transformer oil using sphere and needle electrodes under the magnetic field. of about 6000 and 11 00 gauss. They found that in the case of sphere electrodes the dis'ruptive strength increased about 3% in field strength of 6000 gauss and 4% in field strength of 11000 gauss respectively.
They found, however, in the case of needle electrodes the magnetic field has no effects on the disruptive strength of tranformer oil.View full abstractDownload PDF (231K) -
SHIGEO MOCHIZUKI1926 Volume 46 Issue 458 Pages 1039-1048
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSUtilizing as a Crest-voltmeter the Lichtenberg's figure obtained on the rotating film, which was connected in parallel with the gap under test, the writer investigated the dis charge chacter of var ous gaps subjected to impulse overvoltages.The value of the impulse voltage was chosen high as to afford the discharge in the test gap before its peak value has been reached. The peak value of the impulse voltage employed was about 13 K. V. and its wave front upts 8 K. V. was estimated (refering to the paper of A Leon'iewa) to have the steapness corresponding to the wave length of 42 meter.
From the experiments, following results are obtained.
(1) Under the equal impulse over-voltage supply, the impulse ratio referred to the continuously applied a c. brealc-down voltage becomes the higher, the shorter the gap length.
(2) When the gap leagths are adjusted so as to discharge at equal value of continuously applied voltage, the sphere gap and neellegap give the nearly equal impulse ratio for egual impulse over-voltage. Wide difference in dis charge character betw. F. W. Peek's experiments, which are made at critical voltages, and mine at midway of rise of impulse over-voltage should be noted and deserves to further study.
(3) As to the impulse voltage discharge between the uusymmetrical electrodes, the characteris'ic curves relating to the breakdown voltage and the gaplen th are similar for both pos. & neg discharges, with those obtained under rectified pulsating D. C. Voltage.
Tn both casea, the curves cross at about 22m.m. gap-length and at shorter distances the spark-over voltage is larger when the pt. is pos. & smaller when it is neg., for longer spacings the reverse being the case. (June. 1926)View full abstractDownload PDF (1593K) -
K. KUROKAWA1926 Volume 46 Issue 458 Pages 1049-1068
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe performance characteristics of a cone and a horn type loudspeakers of a prominent maker were studied from their motional impedance. The results of which practically, coinside with the conclusion already attained by a more complicated method.
The absolute values of the motional impedance, which is the measure of the velocity of the actuating element, varied remarkably for different frequencies as shown in Fig. 14 and 22. If judged from these impedance vs. frequency curves, the horn type speaker gives a more uniform response than the cone type as concluded by Minton from his measurement of sound pressures.
It is, however, obvious that the total reproductive character cannot be judged from such test results of the speaker alone, for the correlated circuit constants have a great preponderance upon it. Even when concerned with a loudspeaker only, the distortions from its own sake must be investigated from at least two standpoints. One of them is the ordinary frequency-response charaeteristic as studied by several experimenters and the other is related rather to its behaviour under quasistationary or transient conditions. The actual superiority of the cone type over the horn speaker must be attributed to the reverberation inside of the horn under transient condition.
The present report is concerned with the frequency response characterics as studied from the input side in a steady state. The characteristics of vibrators alone were also studied in the same way.View full abstractDownload PDF (1075K) -
SEITARO GOTO1926 Volume 46 Issue 458 Pages 1069-1092
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis paper describes the present status of modern steam power plants, especially with regard to the use of high-pressure and high-temperature steam, the improvement of the thermal efficiency by means of the reheating and the regenerative cycles.
Remarkable developments in boilers, turbines, condensers and mechanical stokers, the application of pulverized-coal burning, the change in shape and size of furnaces, the problem of air-preheaters versus economizers, improvement of mechanical stokers and the use of mercury-vapour cycle are discussed.
The auther wishes that home-made boilers or turbines, as well as other machineries, shall be widely used in Japan, by pointing out the prghorsent conditions of most of the steam power plants in this country.View full abstractDownload PDF (2401K) -
IKUZO TATKAOKA1926 Volume 46 Issue 458 Pages 1093-1114
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (1451K)
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