User's Manual
Table Of Contents
- Table of Contents
- Introduction
- The Hardware
- Installation
- Getting Started
- Inside the Excelsior
- Resizing the Application Window
- Drop-Down Menu Controls
- Tuning the Excelsior
- Receiver Selection
- Mode Selection
- Function Tabs
- Spectrum Scopes
- Recording Functions
- Attenuator
- Preamplifier
- S-meter
- Top Menu Bar
- File
- Options
- Auto-mute RX not in focus
- Enable second RX
- Filter Length
- Front Panel LED
- Display Offset
- Time
- Keyboard Shortcuts
- VSC Set-up
- Audio Buffering
- AMS Capture Range
- Audio Output
- Show Measurements
- Show Data Rates
- Of particular interest to many users will be the CPU load (excessive CPU load may cause sluggish behaviour or freezing of the computer), and Audio latency. Apart from DDC bandwidth, CPU load may be minimized by reducing the Demodulator filter length (...
- Note: When measuring sensitivity using SINAD, it is very important that the Audio Filter is enabled and the cut-off frequencies (and for FM measurements, also the de-emphasis) are set according to the specified test conditions. Proper audio filtering ...
- Show Waterfall Timestamps
- Calibration
- Hand-Off Receiver
- Color scheme
- Restore factory defaults
- Memory
- Scheduler
- Scanner
- Logger
- Plugins
- Power Switch
- Date and Time Display
- Appendix A – SDR and DDC Primer
- Appendix B – Troubleshooting
- Appendix C – USB Interface Diagnostics
- Appendix D – Dealing with Interference
- Appendix E – G39DDCi PCIe Card Connections
- Appendix F – Waterfall Spectrum Palettes
- Appendix G – Recording File Formats
- Appendix H – Compliance Declarations
- Appendix I – Safety Disposal
WiNRADiO G39DDC User’s Guide
53
The VSC control buttons become available once the VSC is installed:
Engaging the VSC button connects the selected receiver to the virtual sound
card. Using the IF button, you can select the entire contents of the
demodulator spectrum to the VSC; the Audio button only sends the filtered
and demodulated audio.
The VSC IF signal is sent in I/Q (in-phase and quadrature) form, 16 bit, stereo.
The I/Q outputs are at baseband (zero frequency) and the target application
must be able to accept these parameters. Any demodulation mode may be
selected for the IF output - this setting is not relevant as the VSC IF output
sends a raw spectrum without any filtering or demodulation.
The sampling rates for both the VSC audio and IF outputs can be set
independently, using the VSC Set-up function under the Options top
menu bar.
To use the VSC for audio output, select the required demodulation mode and
engage the VSC Audio button. This will connect the receiver’s demodulator to
the VSC stream. The demodulated audio will be affected by all the various
settings normally available for the demodulation, such as bandwidth, audio
filter, etc.
You can have the VSC installed and running in five minutes!
The Digital Bridge™ Virtual Sound Card and many other software accessories are
available via direct download at WiNRADiO online software shop
www.winradio.com/directdownload.