Specifications

Output Frequencies 10 Mc, 1 Mc, 100 kc, 10 kc. Output Amplitudes 10 Mc, lOv peak-to-peak, 30 volts peak-to-peak at lower output frequencies from pulse amplifier r-f harmonics usable to 1000 Mc from 10-Mc output, to 500 Mc from 1-Mc output, to 100 Mc from 100-Kc output, and 10 Mc from 10-kc output. Output Impedence Video cathode-follower, 300 ohms r-f output obtained from crystal-diode harmonic generator. Stability After 1 hour warm-up, drift rate with regulated plate supply is mainly the drift...

Variac Ratings Vs Duty Cycle

One of the important advantages of Variac autotransformers with Dura-Irak contact surface is their ability to operate under short-period overloads without damage. For short-time operation, rated current can be multiplied by a factor that varies between 1 and 10, depending upon the time that the load is applied, as shown in Figure 1. The same properties that prevent deterioration under these high overloads also permit substantial increases in rating for intermittent operation, with the magnitude...

New Type Of Variable Delay Line

With the introduction of the new delay line described in this article, the realization of the complete line of General Radio components and instruments for pulse work is brought one step nearer. At the present time, complete data are available on only one model, the Type 314-S86, but the design of a complete series of variable delay lines with maximum delays of 100, 200, 500, and 1000 millimicroseconds and characteristic impedances of 100, 200, 500, and 1000 ohms is now under way. For a given...

Branch Engineering Offices

NEW YORK 6, NEW YORK 9 O WEST STREET TEL. WOrth 4-2722 CHICAGO 5, ILLINOIS 920 SOUTH MICHIGAN AVENUE TEL. WAbash 2-3820 LOS ANGELES 38, CALIFORNIA lOOO NORTH SEWARD STREET TEL . H O I Iywood 9-6201 SILVER SPRING. MARYLAND 8055 13lh STREET TEL. JUniper 5-1088 PHILADELPHIA OFFICE 1150 YORK ROAD ABINGTON, PENNSYLVANIA TEL. HAncock 4-7419 1 1956 GENERAL RADIO Company, Cambridge, Mass., U.S.A. Since 1915 Manufacturers of Electronic Apparatus for Science and Industry Figure 1. View of the Type 980-A...

Fixed Attenuators

A fixed attenuator is often used to reduce the VSWR of a generator, detector, or other element to reduce the signal level by a known amount or to provide isolation between two parts of a circuit. The requirements for these applications are very satisfactorily met by the new Type 874-G Fixed Attenuators (Figure 1), which are available in 3-, 6-, 10-, and 20-db sizes and have a high power-handling capacity, a low VSWR up to 4000 Mc, and small size. Figure 1. Type 874-G Fixed Attenuator. Figure 1....

Adaptors To Type Lc Connectors

With the increased activity in the use of large-sized coaxial oable in high-power applications, there has been an increasing demand for adaptors to Type 874 Connectors to facilitate measurements on circuits fitted with Type LC Connectors. The Type 874-QLJ Adaptor mates with low-voltage Type LC plug-type connectors for Type RG17 U cable, similar to Type UG154 U and the Type 874 QLP Adaptor mates with low-voltage jack-type connectors, similar to Type UG352A U. 2 See General Radio Experimenter for...

The New Type B Vacuumtube Voltmeterstable And Accurate

The Type 1800-B is a precision Vacuum Tube Voltmeter designed for a wide range of applications. It combines the accuracy of a laboratory instrument with the durability necessary for everyday laboratory and production-line use. Its accuracy is better than fc2 on all a-c and d-c voltage ranges, and its completely shielded diode probe is designed for use into the u-h-f range. The design and construction of this instrument insures that the high accuracy of the new voltmeter will be sustained...

Specifications For Wseries Variacs

MT models are shipped with overvoltage connections and corresponding dial scales, but can be supplied on special order with line-voltage connections and dial scales. Note 2. The Type Y2 dial plate is reversible, with 0 1 15 on one side, and 0-135 on the other. Angle of rotation is 320 degrees. Note 3. Replacement brushes for Type Y2 Variacs are Type VB-1, 55c each. Note 4. Complete dimension drawings furnished on request.

New Sales Engineers

Abel has been transferred to the Los Angeles Office of the General Radio Company. Mr. Abel, a B.S. from Purdue University in Electrical Engineering and an M.B.A. from the Harvard Graduate School of Business Administration, has been a Sales Engineer it the Cambridge Office for the past two years. Frank .1. Thoma, of Los Angeles, has joined the staff of the Los Angeles Office as a Sales Engineer. Mr. Thoma holds a B.S. degree in Electrical Engineering from the University of Illinois. He...

Militarized Line Voltage Regulator

Buck Boost Transformer Circuit Analysis

Where circuit reliability is of prime importance, the need for adequate line-voltage regulation has long been recognized. Xot only can vacuum-tube life be extended by operation of the heaters at a slightly reduced but constant voltage,1 but also performance can be improved by eliminating large plate-supply variations. In many applications, proper power-supply design and the use of a line-voltage regulator can eliminate the need for inefficient, and often less-reliable, series-tube plate- 1 W....

Accessories

The following klystron tubes can also be used in the instrument, but are not stocked by the General I adio Company 2K25 8500-9660 Me , 2K26 All klystron tubes in these oscillators except for the 6043 are designed for relatively infrequent tuning. Unit Regulated Power Supply Unit Power Supply Unit Vibrator Power Supply

For Electrolytic With The Capacit Bridge

Standard practice to test such capacitors at that frequency rather than at the more readily available 60 cycles. To meet this requirement, a modification of the 60-cycle Type 1611-A Capaci Figure 1. View of the Capacitance Test Bridge left with 120-cycle oscillator center and Unit Variable Power Supply right for furnishing the d-c polarizing voltage. tance Test Bridge has been available for some time.1 The modification as shown in the schematic diagram Figure 2 , consists primarily of the...

Frequency Audio Generator

The Sound Apparatus Company, Stirling, New Jersey, has recently completed the development of its Model SL-4 Recorder. It is designed for the plotting of frequency response curves of electro-acoustical apparatus. With it, response curves of loud-speakers, microphones, filters, equalizers, transformers can be automatically plotted in a very short time. A General Radio Type 1304-B Beat-Frequency Audio Generator is especially recommended by the manufacturer as the generator for driving the...

Highprecision Frequency

The Type 1213-C Unit Time Frequency Calibrator is in no sense a simple redesign of its predecessor, the Type 1213-AB Unit Crystal Oscillator.1 It is an all-new design that reflects both the field experience gained from the earlier instrument and the advances in electronic circuit techniques over the past five years. The new calibrator comprises, in a small unit-type case, all the circuits necessary for the frequency calibration of oscillators, receivers, and other wide-range devices up to...

Lowcost Microwave Signal Source

Square Wave Modulation Klystron

One of the most frequently needed swer to this need, and their constantly instruments in the electronics labora- increasing popularity is conclusive evi- tory is a simple, convenient, and inex- dence of how well they perform their pensive signal source. General Radio tasks. Unit Oscillators were developed in an- Unit Oscillators have been available Figure 1. Panel view of the Type 1 220-A Unit Klystron Oscillator with a Type 1201-A Unit Regulated Figure 1. Block diagram showing the elements of...

The Measurement Of Impact Noise

Many of the everyday noises that we hear are impact noises. They range in intensity from the tick-tock of a watch to the tremendous crash of a huge drop hammer. In the industrial plant impact noises are produced by hammers, riveters, chippers, and punch presses and in the office, by typewriters and business machines of various sorts. A related class of noise is explosive noise as in gun fire or even the repeated explosions of gasoline engines in autos and trucks. To industry, some of these...

New Highsensitivity Electrometer

Coupled Cathode Follower

New Dial Brings New Convenience to Octave-Band Noise Measurements S . The new Type 1230-A D-C Amplifier and Electrometer is basically a high-resistance millivoltmeter. Voltage, current, and resistance is indicated on a panel meter and can also be indicated on a recorder. Because of its high sensitivity and excellent stability, this instrument has a wide range of applications in science, engineering, and industry. Typical examples include the measurement of Ionization currents, photo currents,...

New Models Of The Strippeddown Variac Speed Controls

Shunt Variac Speed Control

A Tuned Filter for Use in Capacitance Measurements at 1 High Power with Low Distortion 7 Enclosed models of the so-called stripped-down VARIAC Speed Controls are now available in and -hp sizes, Types 1702-BW, 1700-CW and 1703-BW, respectively, in addition to the 1 and 11 -hp ratings,1 Types 1704-BW and 1705-RW, announced in October, 1955. Variac Speed Controls operate from the a-c power line to control shunt and compound d-c motors. Earlier models in these ratings were supplied without cabinet...

New Decade Capacitors With Poly Styrene Dielectric

View of the Type 980-A Decade Capacitor Unit. manufacture is polystyrene. This material possesses very nearly the ideal characteristics dielectric constant and low dissipation factor that are invariant with frequency. Measurements from dc to at least several hundred megacycles show substantially constant values of these parameters. Mica, on the other hand, exhibits marked polarizations at frequencies below the audio range. These are manifested by rising values of capacitance and...

Crorecorderxy Plotter

The several automatic dial drives described in recent issues of the Kx-perimenter 4- 6 have greatly simplified the problem of automatic display and recording as a routine laboratory operation. They attach to existing oscillators and make possible both oscilloscope and graphic display without necessitating the use of specialized sweeping equipment. They combine the features of economy arul simplicity with the ability to produce highly satisfactory results. To facilitate a selection of the best...

Random Noise

Random-noise signals are used in a great variety of electrical, acoustical, and vibrational tests.1 In these applications a measure of the amplitude of the random-noise signal is usually necessary. Voltmeters with either r-m-s or average response are the most satisfactory types for this measurement, and it has been assumed that peak-respond-ing voltmeters could not be used, because the observed results could not easily be related to those obtained with the other types. The popular...

Miscellany

During the past few months we have welcomed visits from many friends from overseas. Among these are W. M. Ferris, Director, Ferris Bros. Pty. Ltd., Sydney, Australia. Tan Chan, Dean and Acting President, and Liau-Tsung Lin, Instructor, Taiwan College of Engineering, Taiwan, Formosa-China. Knud Blendstrup, Instructor, Elek-troteknisk Laboratory, Polyteknisk S. W. Gough, Manager, Physical Research Division, Dunlop Research Center, Birmingham Dr. George L. Grisdale, Chief of Communication Research...

Services

BAYLY ENGINEERING, LTD FIRST STREET AJAX, ONTARIO TEL. Toronto EMpire 8-6866 1956 GENERAL RADIO Company, Cambridge, Mass., U.S.A. Since 1915 Manufacturers of Electronic Apparatus for Science and Industry MOTOR DRIVES FOR W-SERIES VARIACS AC - IN THIS ISSUE Synchronous Dial Drives 5 120-cycle Bridge for Capacitor Testing 9 Motor drives in a wide variety of speeds, suitable for servo work as well for remote positioning applications, are now offered for the recently announced Types W5 and W2...

Highprecision Impedance Comparator

New Coaxial, Elements Attenuators, Filters, line Stretchers, Detector, and Adaptors S The increased need for means of rapid sorting of electrical components has led to the extensive use of impedance comparators, which indicate directly the percent difference between two impedances without requiring a bridge balance. Most of these operate either at dc or at a fixed low frequency and are limited in scope to simple applications. The new Type 1G05-A Impedance Comparator1 can be used to compare...

Mechanical Design Features

To reduce the weight and bulk of the pulse-generator itself, all the power supplies are contained in a separate unit Type 1391-P1 that connects to the main operating unit through 5-foot cables. This design feature reduces hum and vibration in the main unit and simplifies cooling. All the d-c voltages are produced by conservatively operated selenium-rectifier supplies. The sele- IOOO and IOO sec timing combination IOOO and IOO sec timing combination Figure 9. Sweep, sweep gate, and pulse. Figure...