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General Radio Company 603-A Generator
Manufacturer:
Model:
603-A
Date:
unknown
Class:
Type:
SubType:
Standard-Signal Generator

Information

The Type 603-A Standard-Signal Generator is a general- purpose instrument, designed to have the widest possible application in the measurement of receiver characteristics and transmitter field strengths. By means of easily accessible Plug-In coils, the range extends from 100 kc to 25 megacycles, making the instrument particularly adaptable to the testing requirements of modern receivers operating in the high-frequency as well as in the broadcast spectra. The standard-signal Generator, with no additional equipment, is suitable for determining the sensitivity and selectivity of a radio receiver and, when modulated by an external audiofrequency Oscillator, it may be used in measuring over-all fidelity. When used in connection with a radio receiver, an output meter, and a antenna of known characteristics, the standard- signal Generator may be used in making field-strength measurements. PRINCIPLE OF OPERATION — The Type 603-A Standard-Signal Generator consists, essentially, of a calibrated radio-frequency Oscillator designed specifically for high stability and minimum frequency modulation. An additional oscillator, operating at 400 cycles is included to modulate the output of the radio-frequency Oscillator. Provision is made for determining the percentage modulation and for adjusting accurately the radio-frequency output voltage.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
24
Size:
14.83 Mbytes (15550988 Bytes)
Language:
english
Revision:
Manual-ID:
304-D
Date:
unknown
Quality:
Scanned document, all readable.
Upload date:
30 December 2016
MD5:
2a4de8420855c50c17e0a2044a83ad59
Downloads:
212

Information

PART 1 - DESCRIPTION 6 Uses ... 1 Principle of Operation . ... 1 Advantages ... 1 PART 2 - INSTALLATION Tubes and Batteries Required ... 3 Installation of Batteries ... 3 Installation of Tubes ... 4 PART 3 - OPERATION Radio-Frequency Output ... 5 Connection to Receiver Under Test ... 5 Operation Without Modulation ... ... 5 Internal Modulation ... 6 External Modulation ... 6 PART 4 - OPERATING CHARACTERISTICS Radio-Frequency Range. ... ... 8 Radio-Frequency Calibration ... 8 Output Voltage Range ... 8 Accuracy of Output Voltage ... 8 Reaction of Attenuator ... 9 Output Impedance ... . 9 Measurement of Percentage Modulation ... 9 Accuracy of Percentage Modulation ... 10 Accuracy of Modulation Frequency ... 10 Audio-Frequency Harmonics ... 10 External Modulation System ... 10 Frequency Modulation ... 10 Aging of Batteries ... 11 PART 5 - RECEIVER TESTING External Connections for Operation at Broadcast Frequencies ... 11 Dummy Antenna at Broadcast Frequencies ... 12 External Connections for Frequencies above the Broadcast Band ... 12 Dummy Antenna at High Radio Frequencies ... 13 Measurement of Output of Radio Receiver ... 13 Standard Output Power ... 14 Sensitivity Test . ... 14 Selectivity Test ... 14 Fidelity Test ... 14 Adjustment of Receiver Under Test. . . ... 15 Regenerative Receivers ... 15 Stabilizing Radio Receivers ... 15 Superheterodyne Receivers. . ... ... 15 PART 6 - MAINTENANCE AND SERVICING Replacement of Tubes and Batteries ... 16 Replacement of Thermocouple ... 16 WIRING DIAGRAM LEGEND ... 17 WIRING DIAGRAM,

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