Coaxial Connectors For Rgu Cable

We have received a number of inquiries about Type 874 Coaxial Connectors to fit the widely used Army-Navy Type RG-8 U concentric cable, and we are glad to announce that these are now available, as listed below. They Type are identical with the standard connectors for General Radio Type 874-A7 Cable previously announced,* except that the transition pieces, which connect to the cable, are designed specifically to fit RG-8 U cable. This connector is licensed under U. S. Patent No. 2,125, 816. *W....

Examples Of

A simple method of checking ratio-detector performance, for instance, is to use the combination of a Type 1022-A F-M Standard-Signal Generator, modulated at 400 cycles, and a Type 1023-A Amplitude Modulator, modulated at 60 cycles. With the 400-cycle modulation voltage used as horizontal deflection, and the output of the ratio detector used as vertical deflection on a cathode-ray oscilloscope, the discriminator characteristic will be displayed on the oscilloscope screen. For small...

Generalpurpose Am Standardsignal Gen Er At Or

A N E W general-purpose A M standard-signal generator is now in production, superseding the Type 605, which was discontinued some time ago. The new generator, Type 1001 A, embodies a number of features of design and construction that result in performance characteristics that are greatly improved over those of its predecessor. Among the specific improvements are higher output voltage, wider frequency range, lower leakage, and a better output system. The Type 1001 A Standard-Signal Generator...

Miscellany

A. Bruaux, Ateliers de Constructions Electriques, Charleroi, Belgium Mr. P. L. Jain, Jubbulpore, C.P., India Mr. Arun Prasad, Bangalore, South India Dr. R. A. Smith, Telecommunication Research Establishment, Great Malvern, England Dr. H. Van Dijk, Kam-erlingh-Onnes Laboratory, Leiden, Holland and Mr. Gunnar Hammerik of Maskin-Aktieselskapet Zeta, Oslo, sales representatives for General Radio products in Norway. Papers by Ivan G. Easton, Engineer, Amplifier...

General Radio Company

275 MASSACHUSETTS AVENUE CAMBRIDGE 39 MASSACHUSETTS NEW YORK 6. NEW YORK LOS ANGELES 38, CALIFORNIA CHICAGO 5, ILLINOIS 90 WEST STREET 1 000 NORTH SEWARD STREET 920 SOUTH MICHIGAN AVENUE TE L. W Ort b 2 4837 TEL. H Ollywosd S201 TEL. WAbash 2-3820 VOLUME XXIII No. 9 FEBRUARY, 1949 Copyright, 1949, General Radio Company, Cambridge, Mass., U. S. A. VOLUME XXIII No. 9 FEBRUARY, 1949 Copyright, 1949, General Radio Company, Cambridge, Mass., U. S. A. ONE OF THE MOST TROUBLESOME EFFECTS encountered...

Type A Lowdistortion Oscillator Principles of Operation

Low-Distortion and harmonic distortion in audio-frequency equipment. Its low hum level and symmetry of output waveform are of particular significance in the testing of modulation characteristics of a-m The Type 1301-A Oscillator was designed specifically for use as a test source of exceptionally pure waveform in the measurement of modulation distortion in transmitters and f-m transmitters, especially at high and low modulation frequencies. Figure 1 shows the oscillator in simplified form. The...

Type Decade Inductor

Frequency Characteristics III determining the correction factor uPCoL use the Co value corresponding to the largest decade unit actually in circuit. For each larger decade unit not in circuit add 100 ujuf if the inductor is grounded to the panel or add 20 uMf if the inductor is not grounded to the panel. Mounting The decades are mounted on an aluminum panel in a metal cabinet. Dimensions 1490-A x 7 4 x 5 inches over all height 1490-B 16x 7 x 5 X2 inches overall height. GENERAL RADIO...

W N Tuttle

Speed Range Motor rated speed down to zero at constant torque. A working range of 30 1 can be satisfactorily employed with the Type J 701-AK Control and up to 50 1 or more when the Type 1701-AU Control is used with a converted universal motor having a speed rating of 5000 r.p.m. or higher. Two speed ranges, one up to rated speed and one at reduced field excitation up to approximately twice rated speed, are provided in the Type 1701-AK Control. Only a single range is provided in the Type 1701-AU...

Examples In General Radio Instruments

General Radio Instruments

Many specialized voltage dividers have been designed and manufactured for use in various of our instruments. 1. CRL Dials for Bridges, etc. One of the most widely used items is a Type 433-LC Voltage Divider L for logarithmic, C for compensating mechanism used as a rheostat in several alternating-current bridges, including Types 625-A, 650-A, 740-B, 740-BG, and 1611-A. The 20-db logarithmic feature is not used as such, since there is no extension resistor. The mandrel is used only to spread the...

Distortion Measurement In The Broadcasting Station

THE MEASUREMENT of audio fidelity, distortion, and noise in the broadcasting station has long been considered desirable in order to maintain the high quality service of which modern transmitting equipment is capable. This measurement takes on new importance with the requirement for proof-of-performance checks to comply with the amendments to the Federal Communications Commission Rules and Regulations, Sections 3.254 and 3.46, effective August 1, 1949. These amendments call for a determination...

Highpower Lowspeed Stroboscope

The Versatile Voltage-Divider, Part II speeds, below, say, about 600 r.p.m., has been hampered seriously by the lack of a really powerful lamp, giving sufficient light to impress a positive image on the retina of the eye, in spite of normal room lighting and the comparatively long interval between flashes. At low speeds the light flashes from the more usual stroboseopic lamps ar e sufficiently short to arrest the motion under observation, but the other factor usually considered necessary for...

Example

The intermediate-frequency transformer chosen for this illustration is a Figure 5. Range of conductance measurable within given accuracy limits for various values of K x. standard double-tuned inductively-coupled unit, operating at 455 kilocycles, which is completely assembled in its shield can with its trimmer capacitors connected. In the following paragraphs the general test procedure will be described however, in most applications a number of short-cuts will be apparent to the user. The...

One Of The Basic Tools in all

Branches of communication engineering and in many measurement techniques is the constant-impedance resistive attenuator, calibrated in decibels and designed to vary the voltage or power input into a given load. General Radio Company now offers a new series of precise attenuators, the Type 829 Decade Attenuator Units and the Type 1450 Decade Attenuators, which hold their calibration accuracy over an unusually wide frequency range. The Type 829 Decade Attenuator Units can be built into speech and...

Specifications

This range varies inversely as the frequency, and at other frequencies the dial readings must be divided by the frequency in hundreds of kilocycles. To facilitate the measurement of small reactances, the instrument is provided with an incremental reactance dial which has a range of 100 ohms at 100 kc. Accuracy For reactance at frequencies up to 3 Mc, 2 0.2 X 3.5 kc2ft X 10-10i2 where R is the measured resistance in ohms and kc is the frequency in kilocycles....

Simple Standardsignal Generator For Fm Broadcast

Vehsatile Amplitude Modulator for V-H-F .Standard-Signal Generators 5 Transformer for 300-ohm Balanced Output from Standard-Signal Generators 8 TO SUPPLEMENT the Type 1001-A general-purpose a-in standard-signal generator announced in the September, 1949, Experimenter, an f-m standard-signal generator, specifically intended for measurements on f-m broadcast receivers, is now available. The Type 1022-A F-M Standard-Signal Generator has been designed to provide first-class performance at a...

R

Larger to get the same value of which is the multiplying factor for the resistance capacitor in Equation 3 . It is difficult to manufacture a Type 663 Figure 4. Sensitivity vs. frequency for the Type 916-A and Type 916-AL Bridges. Both the PI and the P1S1 Transformers are supplied with the Type 916-AL. The PI Transformer is used at low frequencies with the Type 916-A. Resistor of the required size, and so a unifilar construction on a mica card is used, similar to those used in the Type 510...

New Decade Inductor

DECADE RESISTANCE UNITS, as exemplified by the Type 510 or 602 series, and decade capacitors, such as the Type 380 or 219 series, have long found use as standards in electrical measurements and as components of experimental circuits in the laboratory. General Radio Company now offers a companion set of high-quality decade inductors which cover the range from one millihenry to ten henrys, and are intended primarily for use at audio and the lower ultrasonic frequencies. Each Type 940 Decade...