General Radio Company 603-A Générateur
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Modèle:
603-A
Date:
Catégorie:
Groupe:
Description:
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.
Type manuel:
Service et Manuel de l'utilisateur
Pages:
24
Taille:
14.83 Mbytes (15550988 Bytes)
Langue:
english
Révision:
Manuel-ID:
304-D
Date:
Qualité:
Document scanné, tous les lisible.
Date de transfert:
2016 12 30
MD5:
2a4de8420855c50c17e0a2044a83ad59
Téléchargements:
651
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,