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meduci AM STEREO Owner's Manual

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Safety and Operating Use Instructions / Owner Manual
FEATURES
Updated 03/24/20
• meduci Advanced Wide Voltage I.F and C-QuAM High Quality AM Stereo Decoder Converter.
• Signal Quality Detector that analyzes signal strength, signal-to-noise ratio, and stereo pilot
tone prior to switching to the stereo mode.
• Precision AM Stereo Pilot Tone Detector.
• I.F Amplifier with I.F AGC Circuit.
• VCO Shutdown Mode at weak I.F signal input.
• Typical I.F Input Impedance: 2 k-ohms
• Class-A biased discrete transistor audio output buffered amplifier stages -- Audio purity
without crossover distortion.
• Decodes Motorola C-QuAM analog AM Stereo broadcasts, where available, with automatic
stereo detection.
WARNING: All host tuner and receivers must NOT be energized or connected to power source when installing this AM
stereo decoder product. There are lethal dangerous voltages present within all consumer electronics devices. You can be
killed when in contact with these high voltages. Refer AM stereo decoder installation and modification to be performed
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by qualified experienced service personnel only.

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Summary of Contents for meduci AM STEREO

  • Page 1 There are lethal dangerous voltages present within all consumer electronics devices. You can be killed when in contact with these high voltages. Refer AM stereo decoder installation and modification to be performed by qualified experienced service personnel only.
  • Page 2 AM STEREO DECODER CONVERTER PC BOARD MODULE Mounting Hole V.D.C (red) LEFT RIGHT AUDIO GROUND (black) I.F INPUT (yellow) FORCED MONO (green) STEREO LED (blue)
  • Page 3 There is also a convenient AM stereo indication to drive LED. In the absence of a good, strong, and solid AM stereo signal, an un-degraded mono output will be provided from both audio channels.
  • Page 4 10mA maximum for driving the user’s stereo LED indicator). Selecting a suitable host AM tuner or receiver Not every FM stereo tuner can be converted to receive AM stereo broadcasts. However, if you are careful when you examine the tuner’s capabilities, the conversion should proceed, and successful results should be achieved.
  • Page 5 Phase modulation can originate from the PLL comparison frequency, and may appear as an audible tone in the recovered audio from the AM stereo decoder board. In this case, the tuning control voltage may require extra filtering. Consult the tuner’s service manual provided by manufacturer for further evaluation.
  • Page 6 I.F output, a resistor voltage divider must be added to drop the I.F to the required level for the AM stereo decoder board. I.F input is derived from the mixer output or I.F stage preceding the detector diode or detection circuitry inside the host receiver or tuner.
  • Page 7 Once the installation has been completed, it is necessary to carry out the set-up procedure. You are now ready to check for AM stereo reception. Tune local AM station that is known and confirmed to be broadcasting the C-QuAM format. Ensure that the stereo LED glows after a few seconds of receiving desired AM stereo station.

  • Page 8: Schematic Diagram

    4 – 10uFd Electrolytic Aluminum Capacitors 1 – 3.6MHz Ceramic Resonator 2 – 47uFd Capacitors 2 – MPS3638 Small-Signal Transistors 1 – MC13028AD AM Stereo IC Chip 1 – 2N3904 Small-Signal Transistor 1 - CFU450B Ceramic Filter 1 – MC78L08 Linear Voltage Regulator...