And Electronics Engineering

Original papers covering the forefront of the art are sought for the First National Conference on Automotive Electrical and Electronics Engineering to be held September 22 and 23 in Detroit, at the McGregor Memorial Center of Wayne State University. Within the context of automobiles and traffic, the following subject categories will be considered 1. Systems and Automatic Control 2. Communication and Signalling 3. Vehicle Propulsion and Control 4. Energy Storage and Conversion 8. Manufacturing...

Type B Standardfrequency Oscillator

Careful evaluation of the basic oscillator parameters, as outlined above, has led to the design of this new oscillator unit. From the beginning it was agreed that the unit should use the 5-Mc, 5th- overtone crystal, include frequency dividers to 1 Mc and 100 kc, and have self-contained emergency power for at least 24 hours. The choice of the 5-Mc crystal was dictated by the belief that Figure 8. Panel view of Type 1115-B Standard-Frequency Oscillator. Figure 9. View of oscillator with cover...

New Gro Representative For Greece

We announce the appointment of the Greek firm of Marios Dalleggio as exclusive General Radio Company (Overseas) representative for Greece, succeeding the firm of K. Karayannis, who have represented us in that country for many years. Effective January 1, 1964, Marios Dalleggio took over these responsibilities and is now directly serving our customers in Greece with competent technical assistance and advice. All inquiries, whether technical or commercial, concerning General Radio products, should...

Measurements On Power Transistors With The Transferfunction Bridge

The measurement of the impedances and other characteristics of transistors at very-high and ultra-high frequencies can be carried out under normal operating conditions with the Type 1607-A Transfer-Function and Immittance Bridge. With some power transistors, however, the heat to be dissipated creates a problem, because it is not always convenient to provide a heat sink for the transistor while it is being measured. At our suggestion, a number of users of the bridge solved the problem by pulsing...

New Va Audio Generator

One of the primary uses of high audio power is in the testing of electronic devices over a range of power-supply frequencies. The new Type 1308-A Audio Oscillator and Power Amplifier is well suited for this function and, in addition, has a number of features that fit it for other applications, many of which are not possible with previously available generators. Among these features are all-solid-state circuitry, low distortion, low dynamic output impedance, and separate meters for output...

Aqi

Recording Wave Analyzer (60-cycle supply) Recording Wave Analyzer (50-cycle supply) Type 191 1-A Recording Sound and Vibration Analyzer Type 1564-9820 Sound and Vibration Analyzer, Rack Model Type 1521-B Graphic Level Recorder with medium-speed motor and recorder accessories Type 1 521 -PI 0B Drive Unit Type 1521-PI 5 Link Unit (with interchangeable 16- and 24-tooth sprockets) Type 1521-9469 Chart Paper, 10 rolls Type 1 304-B Beat-Frequency Audio Generator Type 1521-B Graphic Level Recorder and...

Grs New Bolton Plant

Early in February, about 150 General Radio employees will shift their daily operations about 10 miles west of Concord, to our new plant in Bolton, Mass. Thus begins a new and significant phase in the growth of General Radio. Less than six years have passed since GR went suburban, moving from Cambridge to its new 300,000-square-foot headquarters in West Concord. Only a few years after this move, a 100-acre tract in nearby Bolton was purchased in preparation for the next major Company expansion....

Othei

Tional Bureau of Standards also reciprocity-calibrates this microphone, there is now a direct traceability link between NBS and the GR Reciprocity Calibrator. The Reciprocity Calibrator is a portable, compact instrument containing the reference transducers and acoustic cavity necessary to perform the closed-coupler reciprocity calibration, together with an analog computer and switching mechanisms to reduce the entire procedure to a simple routine. The Type 1559-B Microphone Reciprocity...

New Megohm Wirewound Resistors

The development of a new, fine-wire 1-megohm resistor has made it possible to extend to higher resistances the range of our series of separately boxed, fixed resistors Type 500 , our decade-resistance units Type 510 , and our multiple-decade-resistance boxes Type 1432 . Separate 2-megohm, 5-megohm, and 10-megohm fixed units are now available that use the appropriate number of the new resistors in series. The decades use ten units to give a total of 10 megohms in l-megohm steps. Like other GR...

Auxiliary Equipment

The Type 1565-A Sound-Level Meter was designed primarily for convenient 3 R. W. Younpc, Journal of the Acoustical Society of America, Vol. 36, pp. 289-295 1964 . D. P. Loye, Noise Control, Vol. 5, pp. 230-235, July, 1959. Available from General Radio Company at 1,00 per copy, postpaid. Figure 4. Sound-Level Meter with Type 1560-P52 Vibration Pickup. Figure 4. Sound-Level Meter with Type 1560-P52 Vibration Pickup. operation and low cost, and the Type 1551-C Sound-Level Meter6, with its greater...

Measuring And Recording Assemblies

The recorder can be used in conjunction with an oscillator or analyzer to plot directly frequency-response data of networks or systems. The setup for these measurements requires the recorder, an oscillator or analyzer, a drive unit, and a link unit. This equipment is assembled and supplied as a complete system under a separate type number. The user will find it advantageous to purchase the system in this manner, since our recommended combination of instruments, parts, and chart paper will...

Class B Output

From positive feedback when reactive loads are used. The large negative feedback also greatly reduces harmonic distortion as well as dependence upon power-supply voltages. A single-ended push-pull configuration is used to provide a convenient point to sample the output and close the feedback loop. Thus, the output transformer is not inside the loop a decided advantage with the large feedback factor used. Since the transformer is fed from a low-impedance source, its distortion is very low. One...

For The Graphic Level Recorder

Appropriate link and drive units, chart paper, and other accessories. The Type 1521-B Graphic Level Recorder is, like its predecessor, a completely transistorized, single-channel, servo-type recorder, which plots the rms magnitude of an ac voltage on a logarithmic dB scale. Plug-in potentiometers provide full-scale ranges of 20, 40, and 80 dB, as well as a linear range for dc recording. Recordings can be made as a function not only of time but also of frequency if the recorder is mechanically...

Meterdetector

Operation from a single 1.5-volt C cell. The circuit is basically a tuned, self-biased, class-C oscillator, operating at a frequency of 130 kc s. The ac output voltage from the transformer is applied to a full-wave voltage-doubler rectifier consisting of diode CR1, the transistor base-emitter junction, and the capacitors Cl and C2. Half of the dc output voltage biases the transistor in the cut-off region, affording the desired class-C operation with a conversion efficiency of about 70 percent....

Bridge To Teraohm Territory

Megohm Bridge

Thirty-one years is a long time for an instrument to be on the market. Imagine introducing an instrument now that will still be in a catalog dated 1995 Although the Type 544 Megohm Bridge has been modified occasionally, it is still basically the same instrument that it was in 1933,12 and it is still a popular item. The longevity of this circuit classic may be some sort of record, and is a tribute to its design and its designer. This instrument is a self-contained Wheatstone bridge system, which...

Coherent Decade Frequency Synthesizers

The new General Radio frequency synthesizers combine the simplicity and resettability of step adjustment with the convenience of search and comparison provided by continuous adjustment. The Type 1162-A Coherent Decade Frequency Synthesizer supplies known frequencies from 0 to 1 Mc in step increments as small as 0.1 cps and includes also a continuously adjustable decade that can be switched in beyond the smallest discrete step or at any point in the digit series. The Type 1161-A is nearly...

Info

The Type 1304-P1 MutiiiK Switch supplied with the Type 1350-A assembly is available separately for 87.50. The Type 1304-P1 MutiiiK Switch supplied with the Type 1350-A assembly is available separately for 87.50. Coming in September ELECTRONIC INSTRUMENT MANUFACTURERS' EXHIBIT Nine leading manufacturers of electronic instruments have joined together to present the Fifth Annual Electronic Instrument Manufacturers' Exhibit EIME , which will open September 21 in Massachusetts, make six one-day...