AM20A Superheterodyne Receiver/Transmitter Trainer
This trainer consists of six modules:
Tuned Radio Frequency Stage (TRF)
Radio Frequency Amplifier Stage
L-C Oscillator Stage
Oscillator-Mixer Stage
Intermediate Frequency (IF) Stage 
Push-Pull Amplifier Stage
Also included are an output speaker, microphone and alligator interconnecting leads.
The six modules are constructed of printed circuit boards with two color overlays that show the schematic representation of all the parts mounted in the modules and all the test points. The text lab manual consists of over 450 pages. Each experiment has a pre-test as well as a post-test and a good explanation of the background theory required to perform the experiments. The trainer requires 15vdc at 1 amp to operate.

Condensed Table of Contents
Oscilloscope Familiarization - Voltmeter
The Oscilloscope as a Frequency Meter
Introduction to Communication Receivers
Tuned Radio-Frequency Receivers
Tuning and Resonance
The Basic Amplitude-Modulation Receiver
One-Transistor AM Receivers
A Transformer-Coupled Audio Amplifier
A Functional Tuned Radio-Frequency Receiver
Radio-Frequency Amplifiers
A Tuned Radio-Frequency AM Receiver
Superheterodyne Receiver
Radio Wave Frequency Conversion
Amplitude Modulation Detector Circuits
Narrow Bandpass Amplifiers
AM Radio Receiver Servicing
Amplitude-Modulation Receiver Alignment
Measuring the Big 3 In Bipolar Transistorized
AM Radio Receivers
Servicing Bipolar Transistorized Radios
Basic Transmitters
Basic Electronic LC Sinusoidal Oscillators
The Continuous-Wave Transmitter
Amplitude Modulation (Tone: Emission)
Amplitude Modulation (Voice: A3 Emission)
Frequency Multiplying Multistage Transmitters
Multistage Transmitters -Collector Modulation
Transmitter Tuning and Alignment
Transmitter Measurements Procedures
Transmitter Trouble-Shooting Procedures

Model AM20A
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Additional Manual AM20A
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FM10A Superheterodyne FM Radio Receiver
The FM10A consists of three 5"x 7" circuit boards with a durable two-color overlay in formica wood modules. Each module is an operating section of a superheterodyne FM modulated Receiver. The FM10A requires a source of 12-15vdc at about 300mA to operate.

The individual circuits are:
Tuner and RF Amplifier - IF Amplifier Detector - Audio Amplifier - Speaker
The oscillator-mixer and the RF amp are on one board. The IF stages and the detector are on the second board and the audio amplifier is on the third board. A separate speaker and interconnecting leads are also included.
The RF front end of the FM receiver uses a unique concept that exposes all of the working circuitry of the FM unit to the student.
Varactor (voltage controlled diode) tuning is used and all but one tuning coil are a fixed etched patterns on the reverse side of the printed circuit board. Thus all of the shielding that normally hides the working coils of an FM receiver front end is eliminated. There is no tuning condenser to wear out, get dirty or break down.
A simple pot front end accessible trimmer aligns the front end and tunes stations over the range of 88 to 108Mhz, in separate ranges. Students  can easily peak the RF and antenna sections for full response. All transistors and FET's in the FM radio are readily removable from the top side of the printed circuit board. A simple long wire functions as an antenna.
In the IF section are a total of four adjustable tuning coils, which can be readily aligned using a commercial alignment generator.
The Audio Amplifier is a power push-pull output, with a pre-amp stage. The amplifier can be studied separately and as part of the overall FM receiver. All incidental circuit components of the FM receiver are mounted on the underside of the board.

Condensed Table of Contents:
Introduction to FM Communications
Reactance FM Principles
FM Receiver Familiarization
The Front End of FM Receivers
FM Demodulation - FM IF Sections
Alignment of FM Receivers - Audio Amplifier

Model FM10A
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Additional Manual FM10A
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SSB10 Single Sideband Radio Trainer
This Trainer is specifically designed to give the student a firm understanding of SSB principles, without requiring complicated equipment hookups.
Single-sideband communication with reduced frequency band width requirements and greater efficiency are being put into increasing use, in an effort to provide more effective use of the available radio communication frequency spectrum. This trainer is designed to provide extensive hands-on experimentation in the phenomena of transmitting intelligence on one sideband of the AM wave while the other side is suppressed.
The complete trainer is composed of three integrated panels which when operated together comprise a SSB transmitter and receiver operating on a carrier signal at 1.4 MHz (1400 KHz). All three units are powered by a single self-contained 12 vdc DC, 120 vac, 60 Hz line operated power supply. Also available for 220vac, 50/60hz.
The 3 panels include the following elements:
Panel 1 (Transmitter)
Balanced Modulator - Carrier Oscillator
Audio Oscillator - Single Sideband Filter
Panel 2 (Transmitter)
Heterodyne Mixer - Heterodyne Oscillator
Linear Amplifier
Panel 3 (Receiver)
TRF Receiver - Product Detector
Master Oscillator - Audio Amplifier

The competency based lab manual is arranged in eight separate instructional units. In each unit a discussion is presented covering the major concepts of the topic under investigation. Components and circuits can be traced and connected quickly to maximize use of valuable laboratory time. A final segment of each is a self-test section which provides a means to examine comprehension of knowledge gained.

Condensed Table of Contents:
Introduction to Single Side Band
Single Sideband Signal Generators
Single Sideband Frequency Multiplication
Single Sideband Power Amplifiers
Single Sideband Analysis and Testing
Single Sideband Voltage Amplifiers
Single Sideband Frequency Converters
Single Sideband Overall Evaluation

Model SSB10
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Additional Manual SSB10
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