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Summary of Contents for Leader Electronics Corp. LSG-17
- Page 1 "TECHNICAL FILE" LSG-17 MODEL WIDE BAND SIGNAL GENERATOR lNSTRUCTION MANUAL. LEADER ELECTRONICS CORP.
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Page 2: Table Of Contents
Model LSG-17 SIGNAL GENERATOR TABLE OF CONTENTS SECTION PAGE General........ -
Page 3: General
General LSG-17 is a very versatile thick film integrated circuit (IC), wide- band signal generator designed for the radio experimenter, hobbyist, service technician and instructional purposes. An IC is used in a stable oscillator circuit to cover the frequency range from 100kHz to 150MHz on fundamentals and up to 450MHz on harmonics. -
Page 4: Description
Audio Output 1kHz; 1 Vrms or more (fixed). For l-l5 MHz crystal in Type FT-243 Cyrstal Oscillator holder. (not included). Power Supply 100, 115 120, 220 - 240V, 50/60Hz; approx.3VA. Size and Weight l50(H) 238(W) 80(D) mm; 2.5kg. SECTION DESCRIPTION ®... -
Page 5: Circuit Design
1/10. OUTPUT terminals For connection to RF output leads. Circuit Design The circuits which compose the LSG-17 will be described with reference to the functional block diagram and components designated on the schematic. RF Circuit. The RF oscillator uses an IC, IC102, in the Colpitts circuit to generate frequencies from 100kHz to 150MHz on fundamentals. - Page 6 accuracy is better than ±l.5%. For convenience in setting the IF circuit frequencies, tuning scales are marked at 455kHz and 10.7MHz. The RF output is controlled with the fine adjuster and LOW-HIGH switch. For amplitude modulation, the audio signal is sup- plied by the modulator, IC101.
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Page 7: Operation
The power transformer T1 01, has its primary windings with three taps;100V, 115-120V, 220-240V. It is easy to change line voltage. The LED, D103 is connected across the +20V power supply through the RI09. SECTION 3 OPERATION Preparation Set the POWER switch at OFF. Connect the AC plug to the AC supply. -
Page 8: Modulated Carrier, Internal Source
prevent detuning effects. NOTE: When connecting directly to the input circuit, make certain that there is no ,high DC voltage present. Otherwise, connect a blocking capacitor, 0.05 uF -100 pF, depending on the frequency. Modulated Carrier, internal source Set the mode switch at INT. MOD. By tuning the receiver to the generator frequency, or vice versa, an audio tone will be heard in the loudspeaker. -
Page 9: Crystal Oscillator Output
The RF signal can be used in testing a receiver equipped with a beat oscillator, or circuits that do not require a modulated signal. The RF signal can be applied to a sweep generator for the marker signal. Crystal Oscillator Output Control settings: Mode switch at XTAL. -
Page 10: Oscillator Frequency Calibration
Oscillator Frequency Calibration The RF oscillator frequency can be calibrated to a high degree of precision using the harmonics of the internal crystal oscillator and an external all-wave receiver. The latter is utilized as a frequency transfer unit. Set the mode switch at XTAL. Insert the "standard frequency"... -
Page 11: Removal Of Chassis From Cabinet
Exposing the chassis The chassis can be exposed in the following manner for inspection: Loosen one screw at front part of top cover. Remove one screw on the bottom side. Remove one screw at the back. Take off the cover. 3.10 Line Voltage Changing This instrument can be oper-... - Page 12 To select the desired line voltage, proceed as follows: DISCONNECT THE INSTRU- MENT FROM THE POWER SOURCE, Remove screw on the right side the instrument then off. take the cover (Ref: Fig. 3-1) LINE VOLTAGE SELECTOR Move the Line Voltage Se- Fig.
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