Curriculum
Details
Sample
Activities
SIP328DC
FM Stereo Radio
SCOPE OF THE STUDY
The FM Stereo Radio, varactor tuned and with digital display, is a
modern, sensitive, high-quality training unit for teaching the principles of operation,
trouble-shooting and the alignment of FM tuners with IC stereo demodulators. The trainee
can see, adjust, and generally familiarize himself with the overall operation of a modern
FM Stereo receiver.
The highly sensitive (6 microvolt) receiver contains a 300 ohm balanced input antenna
and is provided with an attached whip. The front-end is a three (3) gang tracked varactor
tuner which contains a JFET RF amplifier. The highly stable local oscillator of the tuner
feeds a digital frequency meter. Four 7-segment LED displays are provided to view the
selected frequency. Tuning is provided by a multiturn planetary gear drive potentiometer.
The high-fidelity output amplifier delivers 4 W (2 W per channel). Dual 8 ohm speakers can
be attached.
The FM radio display includes a 200 microampere meter for center frequency tuning, a
stereo indicator light and an RF signal strength light-bar. Malfunction switches (12)
enable fault-insertion into most parts of the system.
For troubleshooting and general diagnostic training, the panel is reversible. Students
work from the foil side.
COURSE TIME: 45 hours
FEATURES
 | Four-Digit LED Display |
| High Resolution Tuning |
| High Frequency Stability |
| High Sensitivity: 6 microvolt for (S+N) / N Ratio of 6 decibels |
| Selectivity Set by Piezo Filter (Approximately 300 kilohertz) |
| Discriminator Curve, Approximately 200 kilohertz Wide and Tunable |
| Light-Bar Sensitivity Scale and Stereo Indicator, with Center Tuning Meter |
| Twelve Switches with Covers Allow Fault Insertion |
| Numerous Test Points |
| Panel is Reversible so that Students Can View and Work from Either Side |
EXPERIMENTAL TOPICS
- FM Radio Basics
- FM Tuners, Antenna Matching
- IC Chips (IF, Detectors, Meter Drive, AFC, Digital Frequency Display and Audio Amp)
- Alignment Procedures
- Stereo Demodulator
- Stereo Audio Power Amplifiers
- Light-Bar (Signal Strength Indicator)
- Stereo Indicator Circuits
- Channel Balance
- Meter Tuning Circuits
- Troubleshooting Practice with Malfunction Switches
EQUIPMENT
| SIP3328D-1P. FM Stereo Radio Panel |
| SIP327BM/328DM. Laboratory Manual |
POWER BASE REQUIRED
(1) S300B Master Builder, or
(1) S300PSB Power Supply Base
WEIGHT OF INCLUDED
EQUIPMENT
2.0 lbs