MODEL SOUNDS DopplerFX Reference Manual
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MODEL SOUNDS DopplerFX Reference Manual

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Model Sounds Inc.
DopplerFX® Rev. 03
REFERENCE MANUAL
January 20, 2021

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  • Page 1 Model Sounds Inc. DopplerFX® Rev. 03 REFERENCE MANUAL January 20, 2021...
  • Page 2 How you switch on the Bookmarks Viewing Pane will depend on the particular PDF viewing application you are using. ® DopplerFX Rev. 03 Reference Manual Page of 17 Published: January 20, 2021 © Model Sounds Inc.

  • Page 3: Table Of Contents

    Powering the DopplerFX Accessory Board ..................10 CHAPTER 4 – HOW TO OPERATE YOUR DOPPLERFX ACCESSORY BOARD .......... 11 RC Inputs on the ShockWave 3 Module Supporting the DopplerFX Feature ........11 Setting The Observer Position Remotely..................... 11 Enabling/Disabling The DopplerFX Feature ..................12 The DopplerFX LED Indicator .......................

  • Page 4: Chapter 1 - Getting Started - The Basics

    The Model Sounds Inc. DopplerFX feature is unique in the model RC world. It is a feature of the ShockWave 3 sound module and is enabled by the DopplerFX accessory board that communicates with the ShockWave 3 sound module using two signal wires. The DopplerFX accessory board takes its +3.3 Volt power from the ShockWave 3 sound module over the same four...

  • Page 5: Some Simple Math That Explains Doppler Frequency Shift

    It is only due to the wavefront compression and stretching due to its motion that the sound a fixed observer hears appears to change. The DopplerFX feature implemented in the ShockWave 3 sound module enhances this natural effect by applying additional frequency shift at the source to emulate a much higher speed.

  • Page 6: What Is Gnss

    GPS satellites to give better coverage in many of the Japanese cities' concrete canyons. The Model Sounds Inc. DopplerFX board has an on-board GNSS receiver that is capable of receiving all of these GNSS satellite signals, although not all simultaneously.

  • Page 7: Caution About Using Other Gnss/Gps Receivers

    Our DopplerFX board uses a ceramic chip antenna which is omni-directional and thus will not lose a GNSS tracking signal when a model aircraft is rolling, climbing or diving.

  • Page 8: Chapter 2 - Mounting The Dopplerfx Accessory Board

    In this way the GNSS antenna will be facing upwards and towards the sky when the model is flying level the right way up. Keep the DopplerFX Accessory board as far away as possible from all other electronics and metal or carbon fibre structures as they can interfere with the very weak GNSS satellite signals.

  • Page 9: Chapter 3 - How To Connect Your Dopplerfx Accessory Board

    ShockWave 3 sound module. When connecting the 4-wire accessory cable to the DopplerFX board make sure the connector on the cable is inserted into the board connector the right way up. The white wire should always be to the top of the board.

  • Page 10: Powering The Dopplerfx Accessory Board

    This same power provides charging current for the on-board re-chargeable coin-cell backup battery. When it is first received, it is advisable to power up the DopplerFX board through the ShockWave 3 board for a period of 24 hours to charge up its rechargeable coin-cell backup battery.

  • Page 11: Chapter 4 - How To Operate Your Dopplerfx Accessory Board

    Position (more later) and to remotely enable and disable the DopplerFX feature. Pin 1 is system GND, or battery –ve, pin 2 is receiver power, pin 3 carries the DopplerFX RC receiver signal from the radio receiver into the ShockWave 3 board.

  • Page 12: Enabling/Disabling The Dopplerfx Feature

    However, since the DopplerFX board is installed inside the model, this LED is of little use to the user, so there needs to be an external mechanism to indicate when a satellite fix has been obtained.

  • Page 13: Chapter 5 - The Dopplerfxsettings.txt File

    CHAPTER 5 – THE DOPPLERFXSETTINGS.TXT FILE Important settings for the DopplerFX feature are contained in a DopplerFXSettings.txt text file on the microSD card. This file is mandatory. If it is missing, the ShockWave 3 sound module will create one with default values as below: DopplerFXSettings.txt File Default Contents...

  • Page 14: Chapter 6 - How Do I Know When I Have A Satellite Fix

    Subsequently, as long as the backup battery is charged, and if you power-up the ShockWave 3 and DopplerFX board in roughly the same location as last time, this time will be less than 10 seconds. This is called a “hot-start”.

  • Page 15: Chapter 7 - The Dopplerfx Board Backup Battery

    CHAPTER 7 – THE DOPPLERFX BOARD BACKUP BATTERY When a GNSS receiver is first powered up it does a “Cold Start”. This means that it searches for available satellites and builds a small database of available start-up information and other essential data.

  • Page 16: Chapter 8 - Limitations

    Doppler Shift Enhancement Effect is Model Dependent The perceived Doppler shift, both with and without the DopplerFX feature running, is dependent upon the actual sound playing, depending on its tonal content, i.e. mix of different frequency sounds.
  • Page 17 ShockWave 3 sound module ......4 Frequency Shift Limits........16 Some Simple Doppler Shift Math That Explains How Does The DopplerFX Feature Work? ..4 Doppler Frequency Shift ....... 5 Initial Start Point ..........4 The DopplerFXSettings.txt File ......13 Limitations ............

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